The Slag Cement in Sustainable Construction Awards will honor 18 construction projects from across the United States for their outstanding use of slag cement in sustainable concrete. The session will overview each winning project from the categories of Architectural, Durability, Infrastructure, High Performance, Innovative Applications, and Lower Carbon Concrete.

• Reuse of Mine Wastes (Mine Tailings and Mine Waste Rocks) to Produce Geopolymer Building Materials by Arash Nikvar-Hassani
• Effect of pH Reduction on Desorption of Bound Chlorides in Cement Pastes Containing Ground Granulated Blast Furnace Slag Exposed to De-Icing and Anti-Icing Salts by Mohammad Teymouri, Colorado State University

Concrete structure design is constantly evolving to incorporate new materials and analysis methods to produce structures that are both more robust and more efficient. The 6th ACI/JCI Joint Seminar will explore the advancement of design through sessions that focus on design of concrete components, advancements in concrete materials, design for seismic performance, and development of sustainable solutions. The ACI / JCI Joint Seminar is the sixth joint seminar co-sponsored by the American Concrete Institute and Japanese Concrete Institute. The seminars are intended to bring together researchers and practitioners from both organizations to share knowledge with the broader ACI/JCI communities and develop future collaborations.

• Design Concept for Precast and Prestressed Concrete Structural Components by Tomohiro Miki, Kobe University
• Assessment of Fiber Reinforced Cement Composites for Structural Uses by Minoru Kunieda, Gifu University
• Development and Application of Non-Proprietary UHPC Mixtures for Pretensioned Bridge Girders by Mary Beth D Hueste, Texas A&M University
• Seismic Response and Design Considerations of Structural Components and Systems using Ultra-High-Performance Concrete and Other Ductile Concrete Materials by Matthew Bandelt, New Jersey Institute of Technology
• Simulation-and-Learning Driven Design of Cementitious Mechanical Metamaterials by Tetsuya Ishida, The University of Tokyo
• Tri-Directional Loading Tests on Reinforced Concrete Shear Walls by Ryo Yamada, Kyoto University
• Confinement Length of R/C Columns Determined Through Image Analysis by Adolfo Matamoros, University of Texas at San Antonio
• Sustainability and the ACI Building Code: Plans for the 2025 Edition of ACI 318 by Andrew Taylor, KPFF Consulting Engineers

During this session, presenters will speak about development of AASHTO and state seismic bridge codes, seismic bridge research, and how ACI committees may contribute as a resource. By starting this conversation, it is the goal that a tighter integration may develop between the work of ACI 341 and bridge design codes around the world. Attendees will learn the roles of NCHRP, TRB, and AASHTO committees in the development of seismic bridge standards. Attendees will learn how ACI committees can contribute to the process and foster connections between ACI and the various bridge code entities. Attendees will utilize the outcomes of the session to help guide the discussion during break out groups in the 341 main committee meeting.

• AASHTO Committee on Bridges & Structures Overview by Ruth Fernandes, California Department of Transportation
• A Perspective from TRB AKB50: Seismic Design and Performance of Bridges by Monique Hite Head, University of Delaware
• Overview of the AASHTO Code Provision Process by Lee Marsh, WSP USA Inc
• The Federal Role in Structural Design Standards Development by Derek Soden, FHWA Office of Bridges and Structures
• ACI's Role in Bridge Code Development-Panel Discussion

This session will provide state of the art discussion on calcium sulfoaluminate cement (CSA), a sustainable alternative to portland cement. Recent advancements CSA use will be presented, with discussions around hydration and property development, admixtures, durability, and macroscale performance. The session targets researchers working to advance understanding of CSA and industry practitioners interested in utilizing CSA technologies.

• Workability and Retardation Effects on Early CSA Hydration by Phosphono and Carboxylate Chemistries by Christopher Childs, Carnegie Mellon University
• Effect of GGBFS Slag on CSA-Based Ternary Binder Hydration and Concrete Performance by Debalina Ghosh, University of Tennessee
• Calcium Sulfoaluminate (CSA) Cement Curing for Optimal Hydration and Property Development by Lisa Burris, Ohio State University
• Development of BCSA Cement Self-Consolidating Concrete for Structural Repair by Elizabeth Poblete, University of Arkansas Fayetteville
• Using BCSA Cement for Structural Concrete by Cameron Murray, Ph.D., P.E., Assistant Professor, University of Arkansas
• Characterization of Calcium Sulfoaluminate Cements Exposed to Accelerated Weathering Carbonation Conditions by Joonho Seo, Korea Advanced Institute of Science and Technology
• Data-Driven Tools to Enhance the Use of Calcium Sulfoaluminate Cements in Carbon-efficient Construction Infrastructure by Sai Ponduru, Missouri University of Science & Technology
• Chloride Ingress and Chloride-Induced Corrosion in Concrete Produced with Calcium Sulfoaluminate Cements by Ikechukwu Okechi, Texas State University
• Rational Methods for Evaluating Chloride Penetrability and Corrosion Performance of BCSA Cement Composites by Robert Thomas, Clarkson University
• Long Term Pore Structure Changes in Belite Based CSA Cements by Amir Behravan, Virginia Transportation Research Council
• Assessing the Freeze-Thaw Performance of CSA Cement Systems by Syed Jafar Shah Bukhari, Temple University
• Corrosion in CSA and Other ACM Reinforced Concrete Systems by Neal Berke, Tourney Consulting Group, LLC

This session creates a forum for researchers and practitioners interested in the opportunities enabled by 3D printing to create a sustainable future of the built environment through the implementation of sustainable materials and the infusion of bio-inspired designs. The session blends contributions on latest research developments, current research trajectories, and practical applications.

• Potential for Use of Earthen Materials in 3D Printing Applications by Raissa Ferron, University of Texas Austin
• Developing 3D Printable Functional Cementitious Composite by Adam Brooks, Oak Ridge National Lab
• Sustainable Polymer Modified Concrete for 3D Concrete Printing by Moneeb Genedy, Cornell University
• Ultra-lightweight 3D Printable Cementitious Composites by Hongyu Zhou, University of Tennessee
• Bio-Inspired 3DCP with Low-Carbon Footprint by Sriramya Nair, Cornell University
• Enhanced Carbon-Intake of MgO Paste Structures via 3D Printing by Ala Eddin Douba, Purdue University
• Nonplanar Layering of Filaments and Sinusoidally Architectured Structures in 3D-Printed Cementitious Materials by Yu Wang, Purdue University - West Lafayette
• Tough Bouligand and Double-Bouligand Architected Concrete Enabled by Two-Component Robotic Additive Manufacturing by Arjun Prihar, Princeton University
• Eco-Friendly Support Materials for Reinforced Concrete 3D Printing by Mohammed Alnaggar, Oak Ridge National Laboratory
• Microstructural Heterogeneity, Fracture, and Transport in Layered 3D-Printed Cementitious Materials by Shashank Gupta, Princeton University
• An Analysis of Buildability of Sustainable 3D Printed Concretes and Failure Curves Towards Buildability Prediction by Avinaya Tripathi, Arizona State University
• Examining Influence of the Printing Directionality on the Freeze-Thaw Response of 3D-Printed Cement Paste by Rita Ghantous, Oregon State University
• Internal Curing of 3D Printable Cementitious Composite Materials Using Superabsorbent Polymers by Nima Farzadnia, University of Alaska Fairbanks
• A Sustainable Additive Manufacturing System for the Construction of New and Regeneration of Existing Tunnels by Andrea Marcucci, Politecnico Di Milano
• Mechanics of Tough Cortical Bone-Inspired 3D-Printed Architect Cement-Based Materials by Shashank Gupta, Princeton University
• Material Design and Synthesis of 3D-Printable Geopolymers and Foams by Narayanan Neithalath, Arizona State University
• Application of Cellulose Nanomaterials in 3D Printed Sustainable Building Composites by Mehdi Khanzadeh Moradllo, Temple University
• Planning Sustainable Bio-inspired Printed Infrastructure for Erosion Control by Claudiane Ouellet-Plamondon, ETS Montreal, Universite Du Quebec
• 3D-Printed Environmentally Friendly Class C Fly Ash-Based Alkali-Activated Mortar by Mohamed ElGawady, Missouri S&T
• Designing 3D Printable Eco-Concrete by Utilizing Biodegradable Rheology Modifiers by Muhammad Zafar, University of New Mexico

Learn how you can participate in advocacy and outreach to help ACI achieve its mission and safeguard the public. It does not suffice to have ACI committees develop standards and related programs and services without a clear path for advocacy. Standards and relevant programs must be integrated into general building codes, standards, rules, and regulations. There is no mechanism for this to occur without active engagement by ACI members and staff. Adopting agencies, authorities and ministries need to be made aware of the ACI products, educated about the benefits to their respective constituents, and provided enabling language and support materials. For standards and products intended to safeguard the public, it is an obligation of our professional society to ensure, to the extent possible, all benefit from the valuable minimum requirements developed by ACI technical committees. There's a role for all ACI members, you don't need to be a code expert or consultant - there is support from staff and through collaboration.

• Model Building Code Development by Stephen Szoke, American Concrete Institute
• Advocacy and Outreach by Kerry Sutton, American Concrete Institute
• Always Advancing Requires Code Advocacy by You!-Panel Discussion

The objective of this session is to present best practices for incorporating sustainability in concrete education. The scope of the session is not limited to higher education and the audience will benefit from hearing how sustainability is being incorporated into university education, ACI educational ventures, concrete industry education, and other government-related educational initiatives. The main learning outcome is to take home creative ways to enhance teaching and learning with tangible action items in the area of sustainability in concrete education. The session should be attended by students, educators, designers, builders, and code/specification authorities.

• Utilizing Student-Led Experiments to Encourage Creativity, Critical Thinking, and Engagement with Concrete Sustainability Initiatives by Lisa Burris, The Ohio State University
• Life Cycle Assessment in Concrete Mix Design: Lessons from the Eco Concrete Competition by Hessam AzariJafari, Massachusetts Institute of Technology
• Development of Beneficial Use and Sustainable Materials Courses ENV6932 and CGN 6525 by Christopher Ferraro, University of Florida
• Sustainable Pavements Community of Practice: Lessons Learned from Stakeholder Engagement and Education on the Sustainable Pavements Program by Milena Rangelov, Federal Highway Administration- NRC

Pavement design features such as joint spacing, base types, and pavement mixture design are typically set by practice and policy. However, this design strategy often results in over-designed concrete pavements or poor performance. The session's learning outcomes will be how pavement design features and materials can be optimized to reduce initial costs and CO₂ emissions, as well as life cycle costs and lifetime CO₂ emissions. The session would benefit the industry, departments of transportation, and academia.

• Trade-off Analysis to Improve Concrete Pavement Sustainability by Optimizing Designs by James Mack, CEMEX
• Concrete Pavement Design Optimization Provides Cost-Effective Pavement with Improved Long-Term Performance by Juan Pablo Covarrubias, Ltda
• Demonstration of Environmental Impact of Concrete Pavement Full Life Cycle Using Caltrans eLCAP Software by Ali Butt, University of California Pavement Research Center
• Concrete Pavements Sustainability by Milena Rangelov, Federal Highway Administration- NRC

As the supply of conventional supplementary cementitious materials (SCMs) continues to fall behind concrete industry’s demand, new sources must be identified and evaluated to allow production of high-quality and durable concrete. This session reports on the latest research related to the use of harvested fly ash (HFA) and ground bottom ash (GBA) as concrete SCMs. The presentations will include studies on the chemical and physical characteristics of these ashes, their pozzolanic reactivity, and their performance in concrete in terms of their impact on fresh, mechanical, and durability properties of concrete mixtures. The audience will become familiar with this potentially valuable new SCM source.

• A Durability-based Performance Evaluation Approach for the Effective Use of Uncommon Coal Ashes in Concrete by Anol Mukhopadhyay, Texas A&M Transportation Institute
• Reactivity Tests for Emerging SCMs: Towards Standardization and Specification by Prannoy Suraneni, University of Miami
• Use of Fly Ash Co-Mingled with Flue Gas Desulfurization Products as Alternative SCM by Farshad Rajabipour, Pennsylvania State University
• Physico-Chemical Characterization of Ground Bottom Ashes and Fluidized Bed Combustion Ashes and Evaluation of their Performance in Concrete Mixtures by Raikhan Tokpatayeva, Purdue University - West Lafayette

The objective of this session is to recognize the outstanding contributions of Bruce Suprenant to the advancement of knowledge of concrete materials, design and construction. This session will bring a variety of well-recognized concrete experts and industry practitioners to highlight some of the most important technical contributions of Dr. Suprenant to the concrete construction industry.

• Celebrating Bruce: Concrete the Natural Product by Jim Klinger, The Conco Companies
• Bruce Suprenant - Author, Teacher, Influencer, Friend by Peter Craig, Concrete Constructives
• Lightweight Concrete Delamination: Causes, Identification, Repairs and Solutions by Ronald Kozikowski, North S.Tarr Concrete Consulting, P.C.
• ACI 134 Constructability by Lloyd Keller, EllisDon
• The Impact of Low Tech Research Experiences for Undergraduate Students by Heather Brown, Irving Materials Inc
• The National Veteran Memorial Museum by Mike Schneider, Baker Concrete Construction, Inc.
• A 3D Laser Scanning Study on Slab-on-Grade: How Bruce Mentors and Guides Young Professionals by Leo Zhang, The Conco Companies
• Understanding ACI 117 Construction Tolerances and Tools by Michael Ahern, Pivot Engineers
• Cold Weather with Hot and Flat Concrete by Kevin MacDonald, Beton Consulting Engineers
• Contractors and Producers - We CAN Get Along by Colin Lobo, NRMCA
• Expect Compressive Strength Test Results Less than Specified Strength on Every Project by Eamonn Connolly, James McHugh Construction Co.
• Myth and Misinterpretation of "Overdesign" by Kenneth Hover, Cornell University
• Producing Level Slab-on-Metal Deck Floors by Eldon Tipping, Structural Services Inc
• Improving Design and Construction of Concrete Slabs-on-Ground by Scott Tarr, North S.Tarr Concrete Consulting, P.C.
• Constructability - Streamline the Design by Chad Hensley, Wayne Brothers, Inc.
• What it Takes to Make Good High-Performance Concrete by Tarek Khan, Master Builders Solutions US LLC
• Concrete Industry Productivity Takes the Spotlight: ACI's Newest Center of Knowledge by Cary Kopczynski, Cary Kopczynski and Company

The State of California and its local agencies are pushing boundaries to meet bold climate goals. Learn how the cement and concrete industry and proactively engaging with stakeholders and dealing with present challenges every day.

• What the State of California is Doing Now and is Requiring in the Future to Reach Carbon Neutrality by 2045 by Tom Tietz, California Nevada Cement Association
• How Local Measures and Climate Pledges at A&E Firms are Driving Changes and Creating Challenges by Nathan Forrest, California Nevada Cement Association
• Learn How a California Cement Producer in Leading the Pace of Change to Meet Aggressive Climate Goals by Gary Kirk, Calportland Company
• Present-day Challenges of a Ready Mix Producer in Meeting Demands for Lower Carbon Concrete on Projects by Jim Little, National Ready Mixed Concrete
• Hot Topic Session: How the Concrete Industry is Rising to Meet the Climate Challenge - Q&A

To support ACI's expanding focus on technology and innovation, the CIC collaborates with the concrete community to further innovative solutions for industry-wide challenges, by effectively identifying new technology and helping to nurture and support emerging and mature technologies. The Council also works closely with ACI's Director of Concrete Technology to create a formal connection between Council work and ACI. The council is compromised of a diverse set of industry representatives - material suppliers, architecture & engineering firms, contractors, academic, owner and regulatory. CIC's objective is to identify technologies and innovations that are aligned with ACI and industry strategies and help implement their use when appropriate.

• Why GFRP is Becoming Material of Choice in 2023: From Code to Field by Borna Hajimiragha, MST Rebar Inc.
• Scalable Carbon Removal Solution for the Cement Industry Using Algae by Francisco De Caso Y Basalo, of Miami
• Cement, Concrete, Innovation LC³ by Karen Scrivener, Ecole Polytechnique Federale De Lausanne

This session will present uses of chemical admixtures in unique applications that will enable the use of marginal materials as well as additional supplementary cementitious materials to create concrete mixtures with improved sustainability.

• Early Development of Water Reducers in the U.S. – An Example of Innovation, Competition and Cooperation by Lawrence Roberts, Roberts Consulting Group
• For the First Time, We Can Add the Right Amount of Admixture for Each Individual Load (Combining Internet-of-Things and Chemistry: Admixture-On-Demand) by Nathan Tregger, GCP Applied Technologies
• CO2 as a Performance Enhancing Admixture in Ready Mixed Concrete by Sean Monkman, CarbonCure Technologies

The session will feature presentations of leading structures across the globe including the second tallest building in world Merdeka 118. The presenters will showcase thought leadership in design, materials and construction technology to enable the fast construction of durable and sustainable structures. The session will cover in detail new trends and challenges of designing high-performing structures in order to achieve longer service life cycles.

• State of the Art Assessment of 800 Non-Engineered and Engineered Buildings in Mumbai by Aniruddha V Nakhawa
• A Systems Approach for Ensuring Carbon Neutral Constructions and Improving Construction Productivity by Muhammed Basheer, University of Leeds
• Design and construction of Merdeka 118 Tower Using HPC by Ahmad Abdelrazaq, Rise Global LLC

The objective of this session is to present and discuss case studies related to long-term monitoring especially in field settings. The focus is how to translate SHM data into useful information that can be used by engineers and owners to: (1) understand the current condition of the monitored structure, (2) prediction of remaining service life and damage prognosis, and (3) maintenance scheduling and prioritization, if applicable. The session will be of interest to engineers, researchers, and infrastructure owners and operators.

• Long-Term Monitoring of Concrete Bridge Deck in Montana by Todd Nelson, Wiss, Janney, Elstner Associates, Inc.
• Structural Monitoring and Instrumentation for Steel-Concrete Composite Bridges by Hema Jayaseelan, Cedarville University
• Lessons Learned from Data Fusion of Structural Health Monitoring (SHM), Digital Twin Simulation, and Weigh-In-Motion (WIM) Sensors for Evaluation Concrete Bridges by Chaekuk Na, Rutgers University
• Long-Term Monitoring of Repaired Concrete in a Bridge to Assess its Performance: A Case Study by Harshita Garg, University of Leeds
• Time- and Temperature-Dependent Deflection Monitoring of the I-35W St. Anthony Falls Bridge by Brock Hedegaard, University of Minnesota Duluth

Nanotechnology has the potential to enable efficient decarbonization pathways in nullifying the greenhouse gas (GHG) emissions in concrete industry. This session provides a unique opportunity for engineers, scientists, and industry leaders to learn and experience recent research advances on the design of carbon sequestration-efficient engineered concrete materials and technologies targeting zero or negative net CO2 emissions in civil infrastructure.

• Achieving Low-Carbon Concrete with High Mechanical Properties using Nano-CaCO3 Suspension Produced by CO2 Sequestration by Weina Meng, Stevens Institute of Technology
• The Role of Graphene-Based Nanomaterials for Enhancing CO2 Uptake and Mineralization in Engineered Concrete by Panagiotis Danoglidis, University of Texas At Arlington
• Innovative use of Nanotechnology for Sustainable UHPC by Vic Perry, ceEntek North America
• Experimental Investigation on the Effect of Colloidal Nanosilica on Concrete Carbonation by Cihang Huang, Purdue University - West Lafayette
• Sustainable Ultra High-Performance Geopolymer Composite by Surendra Shah, The University of Texas at Arlington
• Reduce Cement Content in Concrete by Enhancing Mechanical Properties with Chi-tin Nanofibers and Nanocrystals by Somayeh Nassiri, University of California Davis
• Carbon-Negative Concrete with Enhanced Resiliency and Ductility using Sustainable Carbon-Based Agricultural Byproducts and Nanomaterials by Maria Konsta, University of Texas at Arlington
• Use of Nano-Particle Containing Admixtures for Concrete with Lower Carbon Footprint by Van Bui, Master Builders Solutions US LLC
• A Life Cycle Holistic Perspective for Nanofunctionalized UHPC Structures in Aggressive Environments: Building Better, for Longer, with Less by Liberato Ferrara, Polytechnic University of Milan
• Carbonization of Cementitious Materials with the Addition of Nano-silica: Micro-Structure Study and Carbon Neutrality Analysis by Rui He, Lyles School of Civil Engineering, Purdue University
• Improving the Performance of Portland-Limestone Cement Through Utilizing Nano-SiO2-Coated Limestone by Payam Hosseini, University of Wisconsin - Madison

Recent years have brought many advancements in the novel use of fiber reinforced concretes including uses of:

• “Smart” concretes made with “sensing” FRCs or fibers with time-changing properties
• Use of various types of nano fibers such as carbon tubes, bio-nanofibers, etc. in conventional as well as UHPC concretes
• 3D printing applications using FRCs
• Extruded FRCs
• Lower CO₂ footprint concretes made with FRCs
• CO₂ neutral steel fibers

The objective of the session is to bring together leading experts in this field, showcase the state-of-the-art and provide a platform for discussion on future directions and opportunities for implementation of these advanced technologies in concrete infrastructure.

• Lowering Carbon Footprint of Concrete Construction Using Fiber Reinforcement Technology by Michael Mahoney, Euclid Chemical
• Application of Bio Based Nano Fibers as Mechanical and Durability Performance Enhancements for Cement Based Composites by Warda Ashraf, University of Texas-Arlington
• Combined Effects of FIber Reinforcement and Layer Orientation on Properties of 3D Printed Concrete by Barzin Mobasher, Arizona State University
• The Use of Steel Fiber Concrete in Combination with Post Tensioning by Hendrik Thooft, Bekaert
• An Extrusion Based System for Additive Manufacturing of FRC Tunnel Linings: Validation via Non-Destructive and Destructive Tests by Andrea Marcucci, Politecnico Di Milano
• Role of Nanosheets and Nanofibers for CO2 Capture in Cementitious Systems by Surendra Shah, University of Texas - Arlington
• Combined Effects of Fiber Reinforcement and Layer Orientation on Properties of 3D Printed Concrete by Avinaya Tripathi, Arizona State University
• The Role of Nanofibers in Controlling and Optimizing the Thermoelectric Efficiency of Engineered Concrete by Panagiotis Danoglidis, University of Texas at Arlington
• Tailoring of Steel Fiber Surface by Coating Cellulose Nanocrystal for Ultra-High-Performance Concrete (UHPC) by Weina Meng, Stevens Institute of Technology

The purpose of this session is to offer authors/speakers an open forum for presentation of recent technical information that does not fit into other sessions scheduled for this convention. Any aspect of structural analysis or design, concrete materials science, or construction, manufacturing, use, and maintenance and health monitoring of concrete structures and products can be presented.

• Study on the Behavior of Shear-Critical UHPC Beams Using Machine Learning and Finite Element Analysis by Amjad Diab, University of Texas Austin
• Performance of Steel Fiber-Reinforced Concrete (SFRC) Coupling Beams Under Simulated Wind Loading by Muhammad Bajwa, University of Wisconsin Madison
• Rigorous Yield Line Analysis to Evaluate the Capacity of RC Barriers Subjected to Vehicular Collision Force by Fahed Salahat, Kansas State University
• Punching Shear Capacity of Plate Dowel Joints for Slabs-on-Grade by Omar Jadallah, University of Illinois Urbana-Champaign
• Digital Image Correlation Enabled Buildability Determination of 3D Printed Concrete Elements by Avinaya Tripathi, Arizona State University

The objective is to discuss the latest methods available for predicting the field condition and deterioration of concrete bridge elements and systems. Accurate predictions of bridge condition are important because predictions can guide maintenance decisions, planning and asset management for bridge owners. The session will be of interest to researchers and practitioners in structural or material engineering as well as bridge owners.

• Predicting Condition of Reinforced Concrete Beams with Shear Cracks using Machine Learning by Rodrigo Castillo, SUNY University of Buffalo
• Assessing Deterioration of Concrete Structures using Self-Sufficient Reactive-Transport Modeling by O Burkan Isgor, Oregon State University
• Developing Deterioration Models for Life Cycle Cost Analysis of Bridges by George Morcous, University of Nebraska Lincoln
• Load Rating of Deteriorated Concrete Slab Span Bridges by Brock Hedegaard, University of Minnesota Duluth
• Bridge Deck Evaluation with Non-Destructive Testing by Thi Ha, University of Colorado Denver
• Assessing Pour-Back Durability: Beyond Pull Off Testing by Natassia Brenkus, The Ohio State University

The design, analysis, and performance of structural concrete slabs under punching shear loading conditions are topics that have been studied extensively over many decades and are well-documented in the literature. However, the majority of the work reported in these areas has generally related to conventional concrete slabs subjected to highly-idealized loading conditions.

Structural engineers need to find new, innovative ways and methods to design new structures but also to strengthen the existing ones to be safe, resilient, and sustainable. These challenges can be addressed through the use of integrated systems and high performance and smart materials. We live in a new era of improved computational capabilities, advances in high-performance computing, numerical and experimental methods, and data-driven techniques, which give us for the first-time broader access to larger and better data sets and analysis tools. These new insights can be seen as essential to examine further the structural behavior of concrete slabs under punching shear and to implement and analyze new materials and loading conditions.

• High-Performance Flat Plate Voided Slabs by Mike Mota, Cobiax USA Inc.
• Influence of Slab Openings On the Punching Shear Behavior of Reinforced Concrete Slabs Supported On L-Shaped Columns by Graeme Milligan, University of Waterloo
• Assessing Slabs Under Asymmetrical Punching Loads Aided by LEFEA by Alex de Sousa, University of Sao Paulo, Sao Carlos School of Engineering
• Nonlinear Finite Element Analysis of RC Flat Plates Subjected to Non-Uniform Connection Stresses by Trevor Hrynyk, University of WaterlooTrevor Hrynyk, University of Waterloo
• Effect of the Shear Reinforcement Anchorage and Detailing on the Punching Resistance of Flat Slabs by Guilherme Melo, Universidade de Brasilia
• Failure Mechanism of One-Way Slabs Under Concentrated Loads in Transition Between Shear, Punching and Flexure by Alex de Sousa, University of Sao Paulo, Sao Carlos School of Engineering
• Identifying, Evaluating, and Correcting Punching Shear Deficiencies in Flat Plate Construction by Matthew Fadden, WJE
• Review of Key Parameters Affecting Punching Shear Strength of Post-Tensioned Slabs by Madhura Sanjay Chavan, Texas A&M University
• Large Scale Experimental Tests of Size Effect in Pile Caps Loaded in Two-Way Shear by Lucas Laughery, SpaceX
• Estimating the Two-Way Shear Strength of Large Reinforced Concrete Pile Caps by Lucas Laughery, SpaceX
• Seismic Behavior of Slab-Column Connections Using High-Performance Fiber Reinforced Concretes by Rui Marreiros, Nova School of Science & Technology
• Punching Capacity of Spread Footings Using AC-318-19 and the Strip Model by Scott Alexander, University of Alberta

This session will feature presentations of original, unpublished results from ongoing research projects and leading-edge concrete technology and research throughout the world.

• Investigating Mechanical Properties of 3D-Printed Engineered Cementitious Composites with Ultra-High Tensile Strain Capacity by Amir Bakhshi, University of New Mexico
• Anisotropic Chloride Transport in 3D Printed Concrete and its Dependence on Layer Height and Interface Types by Sahil Surehali, Arizona State University
• Concrete Characterization Using Ultrasound and Physics-Informed Neural Networks by Sangmin Lee, University of Illinois Urbana-Champaign
• Behavior of Earthquake-Resistant Rectangular Walls with Mechanical Splices by Utsav Neupane, University of Kansas
• ASR Resistance of Ground Bottom Ash Based Alkali-Activated Concrete and the Prospect of Using MCPT for the Evaluation by Shubham Mishra, Clarkson University
• Durability Properties of High Early Strength Concrete with Alternative Cement and Accelerated Portland Cement by Jeremy Smith, Oregon State University
• Experimental Study of Structural Concrete’s Fatigue Capacity by Mohsen Minaeijavid, Tufts University
• Deterioration Detection in Prestressed Concrete Railroad Ties Simulated Vibration by Ryan Martin, California State University
• Development Length and Splice Strength of High-Strength Reinforcing Bars in High-Strength Concrete by Ram Krishna Adhikari, The University of Kansas
• Fiber Distribution in UHPC Beams: An Insight from 3D Micro-CT Scans on Shear Tests by Manuel Bermudez, National Cheng Kung University
• Assessment of the Development Length Equation for GFRP Rebars in Tension by Jesus Ortiz, University of Miami
• An Automated Novice-Tailored Approach to Impact-Echo Condition Assessments by Zachary Coleman, Virginia Polytechnic Institute and State University
• Behavior of Reinforced HPFRCC Columns Subjected to Varying Axial Load Ratios by Joseph Almeida, New Jersey Institute of Technology
• Multi-Level Assessment of the Influence of Moisture and Temperature in ASR-Induced Expansion and Deterioration by Olusola Olajide, Concordia University

The special session will focus on advances in the resilience, failure mitigation, and preservation of concrete bridges and structures. Of interest are presentations concerning a wide variety of technical aspects from laboratory experiments to field applications, involving the evaluation, design, and construction of load-bearing members and systems. The session will benefit those who lead the design and construction of bridges and structures toward resilient and sustainable built environments.

• Corrosion Behavior of Steel Rebar in Graphene Oxide Modified Fly Ash-Based Geopolymer Concrete by Xianming Shi, Washington State University
• Rehabilitating Side‐by‐Side Box‐Girder Bridges with Ultra‐High Performance Concrete by Vic Perry, ceEntek North America
• Resilience Under Non-Stationary Extreme Design Loads Due to Climate Change for Coastal Concrete Structures by Ming Liu, NAVFAC - EXWC
• Seismic Performance of Corroded and Repaired RC Columns Built using Accelerated Bridge Construction by Ju-Hyung Kim, University of Colorado Denver
• Chemical Impacts of MgCl2 on OPC and HVFA Concrete by Jialuo He, Washington State University

The session will provide an overview of the research currently going on in Italy on the topic of sustainability of concrete materials and structure, ranging from the use of alternative binders and recycled materials to structural repairs and interventions, non-metallic reinforcement, life cycle assessment of UHPC structures in aggressive scenario and of composite timber-concrete structures.

• Building Better for Longer with Less: “Holistic” Lessons from a Lustrum Long Research on UHPC/UHDC @PoliMi-DICA by Liberato Ferrara, Polytechnic University of Milan
• Reinforced Cementless Concrete: Mechanical Properties and Structural Performance by Maria Antonietta Aiello, University of Salento
• Structural Concrete with Recycled Aggregates: Challenges and Perspectives by Enzo Martinelli, University of Salerno
• Sustainable CSA Cement-Based Precast Concrete Tunnel Lining Reinforced with GFRP Bars: Challenges and Opportunities by Simone Spagnuolo, University of Rome Tor Vergata
• Reinforced Concrete in Roman Opus Caementicium Monuments: Sustainability of Interventions by Silvia Santini, Roma Tre University
• How to Consider Deterioration Effects in Assessing the Potential Retrofit of Existing RC Structures by Paolo Riva, University of Bergamo
• The Italian Challenge for the Sustainability of Existing Concrete Construction by Andrea Prota, University of Naples
• Alternative Binders to Portland Cement to Produce Sustainable "Special" Concretes: Feasibility and Open Issues by Luigi Coppola, University of Bergamo
• Exploring the Effectiveness of Hybrid Timber Concrete Structures by Giovanni Muciaccia, Polytechnic University of Milan

The objective of this session is to provide a greater opportunity for undergraduate students to present their research at a national meeting. This session will focus on research conducted predominately by undergraduate students. It is expected that this session will draw a new group of students to ACI and the convention. It will also allow students to hear presentations of a slightly less technical nature that are more in keeping with their current level of knowledge regarding concrete.

• Non-Rigid Formwork Systems for Reinforced Concrete Structures by Sean Sadler, Kennesaw State University
• Design Optimization and Structural Application of High Strength Fiber Reinforced Concrete by Colin Butler, Virginia Military Institute
• Estimation of the Compressive Strength of Concrete Produced by SOBOCE.SA Using the Ultrasound Wave Velocity and the Rebound Index of the Sclerometer in the Metropolitan Region of Cochabamba by Andres Jaramillo Herrera, Universidad Privada Bolivina
• Tensile Performance of GFRP Bars Connected with FRP Couplers by Jenna Hays, Northern Arizona University
• Monitoring pH in BCSA Cement by Abigail Kienzle, Clarkson University

The field of concrete science and technology has recently experienced a surge of interest in using data science techniques (such as machine learning (ML), artificial intelligence (AI) and big data analysis) for the discovery, development and understanding of cementitious materials and processes. This session will focus on the application of data science techniques, including property prediction, materials characterization, materials simulation, and process analysis. More importantly, this session will discuss the imminent challenges and opportunities that will guide an effort to foster the development of a robust, data-informed concrete science ecosystem. The outcome of this session will be an understanding of the recent data science advances and the feasibility of their wider adoption in the concrete industry.

• Factors Affecting Concrete Performance and Challenges in Accounting for that by Karthik Obla, NRMCA
• Data-driven Concrete Science: Applications, Challenges, and Best Practices by Zhanzhao Li, Pennsylvania State University
• Using Artificial Neural Networks to Connect Concrete Composition and Rheology to Pumpability/Printability/Buildability Requirements in 3D Concrete Printing 3DCP Applications by Andrea Marcucci, Politecnico Di Milano
• Design and Discovery of Sustainable Cementitious Binders via Machine Learning Trained from a Low-Volume Database by Taihao Han, Missouri S&T
• From Data-Driven Models to Material Characterization: A New Approach to Improve Durability and Mechanical Performance of High-Early Strength Concretes by Cesario Tavares, Texas A and M University - College Station
• Transfer (Machine) Learning Approaches Coupled with Target Data Augmentation to Predict the Mechanical Properties of Concrete by Narayanan Neithalath, Arizona State University
• Using the Bulk Oxide Content to Predict Performance of Fly Ash in Concrete with Machine Learning by Tyler Ley, Oklahoma State University
• An Intelligent Approach for Predicting the Performance of Repair Concrete in a Bridge in Northern Ireland from Real-Time Sensor Data by Harshita Garg, University of Leeds

Artifical intelligence (AI) has the potential to revolutionize the concrete business. Join us as professionals from the domains of research, industry, and technology examine current uses of AI in practical technologies and offer their predictions for the future. The speakers will outline the innovative ways AI is optimizing concrete mix design, speeding manufacturing processes, enhancing structural performance, and enabling efficient concrete industry asset management. Participants will learn more about predictive modeling, structural health monitoring, data-driven decision-making, and integrating AI technologies into current processes. Participate in a panel discussion that is interactive so that you may ask questions, provide suggestions, and add to the conversation on the use of AI in practical applications. Consider possible future developments such as automated quality control, intelligent infrastructure, and data-driven design optimization.

• From Lab to Field: Using AI to Decarbonize Concrete at Scale by Mathieu Bauchy, University of California, Los Angeles
• Artificial Intelligence in Condition Assessment of Concrete Structures by Sattar Dorafshan, University of North Dakota
• Big Data to Discovery: Advancing Concrete Material through Explainable and Causal AI by M. Z. Naser, Clemson
• AI and Concrete: An Idea Whose Time has Come by Julius Kusuma, Meta Platforms, Inc.
• 123 Forum: AI Applications in Concrete: Present and Future - Q&A Discussion

Nano particles designed for concrete have been successfully used in laboratory and field applications over the last 20 years to enhance both the strength and durability of concrete. The following session will focus on a progress update on the application of nano-based additives and admixtures in concrete.

• Colloidal Silica in Concrete, Specifications for Today and Tomorrow by Whitney Belkowitz, Intelligent Concrete, LLC
• Nano Silica in Concrete Bridges and Pavements for Indiana Dept of Transportation by Dan McCoy
• Surface Applied Nanotechnology by Shaun Lane, NanoCrete, Inc.
• Nano Silica Hydrogels for Rejuvenating Deteriorated Concrete by Jon Belkowitz, Intelligent Concrete, LLC

A sequence of earthquakes hit several regions in Turkey with magnitudes (Mw) of 7.8 and 7.5 on February 6, 2023. The magnitude 7.8 was the biggest earthquake since the 1939 Erzincan earthquake of the same magnitude, and second-strongest recorded after the 1668 North Anatolia Earthquake. The most devastating earthquake in the history of Turkey in terms of structural and geotechnical damage and fatalities caused, this presentation will share the investigation and preliminary analysis aftermath of this major seismic event by the ACI 133 Committee members serving on the reconnaissance team and discuss the subsequent research as well as code advancement efforts ACI is committed to as Always Advancing.

• Key Elements of an Effective Concrete Building Code Program by Bernie Pekor, American Concrete Institute
• 2023 Turkey-Syria Earthquakes: Observations on Reinforcement Detailing by Remy Lequesne, University of Kansas
• Observations on Proportions of the Reinforced Concrete Buildings in Turkey by Chungwook Sim, University of Nebraska-Lincoln
• Comparing the Effects of the 2023 Turkey Earthquakes and the Effects of Other Earthquakes by Santiago Pujol, University of Canterbury

The objective of the session is to present the content of the report Additive Construction by Concrete Extrusion: An Emerging Technology Report. Those who should attend are industry professionals, academics, government, and standard representatives as well as students. The topics covered are the terminology, 3D printing processing platform, material development, quality control testing, reinforcements and anchorage, case study, and emerging questions.

• 3DCP? 3DPC? C3CP? AC? ACC? AM? Are They All the Same? by Sriramya Nair, Cornell University
• 'Emerging Technology Report' Presentation Advancements in Concrete 3D-Printing Processing Platforms by Reza Moini, Princeton University, Civil and Env. Eng. Dep.
• Chapter 4: Materials for 3D Printing by Claudiane Ouellet-Plamondon, ETS Montreal, Universite Du Quebec
• Actual Applications of 3D-Printing: Chapter 7 of the Emerging Technology Report by Raissa Ferron, University of Texas at Austin

Field Concrete Testing follows ASTM Standards with most projects requiring ACI Certification by the testing technicians. Test results that result in low strength not meeting specifications are challenged by both producers and Testing agencies with little validation the testing requirements. The Concrete Testing Adherence Collaboration (CTAC) is a tool that allows project teams to confirm testing performance daily, where ACI only validates performance once every five years.

• Take the Question Out of Field Concrete Testing with a Tool YOU can Use by James Mesite, Colorado Ready Mixed Concrete Association

The objective is to familiarize ACI community with composite anchors for externally bonded fiber-reinforced polymer (FRP) strengthening systems. The session will specifically focus on anchors used to enhance the performance of flexurally strengthened concrete members, attracting primarily the practitioner, researchers, and producers from the concrete repair community.

• Investigating the Effects of U-Wrap Anchored Doubly Strengthened Reinforced Concrete Beams with CFRP Sheets by Khalid Al Shboul,Barr Engineering Co.
• Can U-wraps Concurrently Serve as Supplemental Shear Reinforcement and Anchorage of Flexural CFRP in Shear-Deficient Reinforced Concrete Beams? by Muhammad Ishfaq, University of Delaware
• Increasing the Seismic Moment Capacity of Concrete Columns and Walls Using EBR-FRP and FRP Anchors by Enrique del Rey Castillo, University of Auckland
• Performance of FRP Strengthened Concrete Beams Anchored with Fiber Anchors Under Cyclic Loading by Salman Alshamrani, Kansas State University
• Tests of Decommissioned Box Beams Strengthened with CFRP Laminates by Andreas Stavridis, University at Buffalo
• Durability of Carbon Fiber Splay Anchors in Bond Critical, Externally Bonded CFRP Under Hygrothermal Conditioning by Sophia Rupp, University of Delaware

This session will discuss challenges associated with the assessment of historic concrete structures prior to repair. The session will cover additional considerations by designers during the assessment due to the unique challenges of historic or architecturally significant structures. Attendees should include students, designers, and contractors.

• Preservation of a Frank Lloyd Wright Usonian Automatic by Tara Ikenouye, WJE; Chrisopher Dabek, Stone & Lime
• Carpenter Center for the Visual Arts - Harvard University by Matthew R. Pitzer, Simpson Gumpertz & Heger
• Thin-Shell Concrete Structures: Problems in Identification and Attribution by Thomas Boothby, Penn State University.

These sessions are useful to design engineers, owners, concrete producers, and students that are involved or want to know more about modeling the service life of concrete exposed to chlorides. The differences between deterministic and probabilistic approaches will be addressed.

• Introduction to Concrete Mixtures, Parameters and Scenarios by Neal Berke, Tourney Consulting Group, LLC
• Life-365 Service Life Prediction Model™: For Reinforced Concrete Exposed to Chlorides by Mark Ehlen, Life-365 Consortium
• Duracrete/fib Bulletin 34 Service Life Model and AASHTO Guide Specification for Service Life Design of Highway Bridges by Brad Pease, COWI North America
• Probabilistic Service Life Modeling Implemented through WJE CASLE™ by Marwa Abdelrahman,Wiss, Janney, Elstner Associates, Inc.

Concrete bridges may encounter various extreme events during the service lives. Such events are increasing in intensity and frequency. The sessions will include recent developments to improve bridge resiliency through design, construction, evaluation and retrofit. Both natural and man-made events, and those included/not included in AASHTO LRFD Specifications, will be considered. Bridge designers, construction companies, federal/state/local government entities, educators and students should attend the sessions.

• Improving Transportation Network Resiliency Using In-Situ Evaluation and Innovative Construction Methods by Erik Zuker, HNTB
• Dynamic Evaluation and Retrofitting of Prestressed Concrete Girder Bridges with Vibration Problems by Nur Yazdani, UT Arlington; Andy Foden, HNTB

You learned the basics of concrete design in your introductory course in college. Now take home some additional design skills you probably did not see there. Audience is senior undergraduates, graduate students, young professionals, practitioners looking for continuing education.

• Anchorage to Concrete by Matthew Senecal, American Concrete Institute

The earth’s natural resources are being consumed at a very high rate for many years. The potential depletion of resources, CO2 emissions and high energy consumption rates in the process of production, increase the necessity of recycling. All sectors of the society are responsible for these concerns, especially the construction industry.

As a major construction material, concrete is increasingly judged by its environmental impacts and reusing the readily available concrete is becoming very important. Considering that much of the US infrastructures and urban buildings now require renovation and replacement, the concrete left behind can be a valuable source of aggregate for new concrete. Such concrete is usually called Recycled Aggregate Concrete. Through cost analyses, it is shown that using recycling concrete as aggregate for new concrete production can be a cost-effective method for construction.

• Performance Evaluation of Using Waste Glass Powder and Fly Ash in Alkali-Activated Slag Binder and Mortar Samples as Partial Precursors by Qingli (Barbara) Dai, Michigan Technological University
• Factors Affecting Shrinkage of Concrete Containing Recycled Concrete Aggregates by Daniel Jansen, California Polytech State University
• NanoCarbon Black in UHPC – Effect on Conductivity and Mechanical Properties by Nancy Soliman, Texas A&M University-Corpus Christi
• Mortars with Recycled C0₂ by Alessandro Fantilli, Politecnico di Torino
• Using Biochar in Concrete by Mohamed Mahgoub, Concrete Industry Management

The purpose of the session is to present the details of various chapters of the current ACI 370 primary document titled "Design of Structures for Blast". This document is currently being revised and various chapter leads will be presenting the updated version of the chapters. This session will be useful for any engineer interested in blast design, researchers, students, and government officials working on blast-related projects.

• Overview of Recent Developments in Blast-Resistant Structural Concrete by Matthew Gombeda, Illinois Institute of Technology
• Comparison of U.S. Blast Design Procedures and Protection Requirements by William Zehrt, US Dept of Defense Explosives Safety Board
• Opening the Door to Novel Reinforced Concrete Materials in Blast Design by Charles Crane, USACE-ERDC
• Blast Hardening Retrofit Concepts for Existing Buildings by Marlon Bazan, Protection Engineering Consultants

Overview of latest developments in Building Information Modeling (BIM) and Virtual Design & Construction (VDC).

• Concrete BIM Standards: Published and Ongoing Documents, Workflows, and Application by Leonardo Garcia, Georgia Institute of Technology
• Use of Industry Foundation Classes in a Unified Engineering Design and BIM Workflow by Jeff Dragovich, DeSimone Consulting Engineering
• Placing Digits Before Concrete by Leo Zhang, The Conco Companies
• Latest Developments in VDC from Rebar Detailing and Fabrication Perspective by Dennis Fontenot, Commercial Metals Company; Robbie Hall, Headed Reinforcement Corporation

High concrete curing temperatures above 158°F can in some cases result in a condition called delayed ettringite formation (DEF) that can cause severe cracking and concrete deterioration. Occasionally a concrete member will exceed this temperature during curing, causing concern about the potential for DEF in the member.

• History of DEF Testing and Specifications by Mary Vancura, American Engineering Testing, INC
• Development of an Accelerated Test Method for Determination of Delayed Ettringite Formation (DEF) by Christopher Ferraro, University of Florida
• Long-Term Laboratory Test Methods and Field Exposure Blocks for Delayed Ettringite Formation (DEF) by Thano Drimalas, University of Texas at Austin
• Mitigation Delayed Ettringite Formation in Cementitious Mixtures Incorporating Ground Granulated Blast Furnace Slag (GGBFS) by Abla Zayed, University of South Florida

First and second place winners of the Excellence in Concrete Construction Awards program will give a presentation on their winning project.

• I-74 River Bridge by Griffin Hahn, Hahn Ready Mix Co
• Quay Quarter Tower: The World's Tallest Upcycled Skyscraper by Joe Daven, BGE
• UCSF Nancy Friend Pritzker Psychiatry Building by Leo Panian, Tipping Structural Engineers
• UBC MacLeod Engineering Building by Stephen Teeple, Teeple Architects
• North Bend Torguson Skatepark by Matt Fluegge, Grindline Skateparks, Inc.
• BOU YOU ROU/Architecture of Ocean by Yoshiyuki Kawazoe, Kousou Inc.
• Excellence in Creating an Iconic Structure by Hari Shukla, L&T Construction
• Block G-1-Tampa: "The Decorative Precast Building" by Aditya Yadav
• Sixth Street Viaduct Replacement Project by Julia Sanchez De La Vega
• University of Los Andes Civil Quarter Structural System University by Cristian Undurraga, Undurraga Deves Arquitectos
• The Reed at Southbank by Max Levin, McHugh Concrete Construction

There are 3 participants that are key to improving the productivity of concrete construction. The design team, the contractor and the ready-mix producer. Working together these 3 parties can significantly impact concrete construction productivity. In this session we will hear from all 3 viewpoints on how innovation in each of their fields has not only impacted their individual productivity but their partners in construction as well. We will have presentations from a ready-mix company, a concrete contractor and a design professional and will then have an open question and answer panel session with all 3. There has been more innovation in designing, producing a constructing with concrete in the last 5 to 8 years than in the previous 25.

• Durability and Productivity from Designer's Perspective by Rashid Ahmed, Walker Consultants
• Technology Used in Ready Mix by John Deering, Core Ready Mix
• Improving Productivity in Concrete Construction by Rob Strobel, Lithko Contracting, LLC
• Panel Discussion by Panel

This session is aimed at integrating experiments and modeling to better understand concrete from material and structural aspects. Students, faculty, and professionals will attend to further their knowledge on both experiments and modeling.

• Knowledge-Informed Machine Learning for Concrete Property Prediction by Zhanzhao Li, Pennsylvania State University.
• Optimization of Shrinkage Compensating Fiber-Reinforced Mortar for Repair by Kamran Aghaee, Missouri University of Science and Technology
• Using Machine Learning to Predict the Performance of Coal Ash in Concrete with the Bulk Oxide Content by Tyler Ley, Oklahoma State University
• Advances in the Thermodynamic Modelling of Novel Magnesia-Based Cementitious Binders by Juan Pablo Gevaudan, The Pennsylvania State University
• Numerical Modelling and Data-Driven Approaches as Valuable Tools for the Development of New 3D Printable Inks by Giacomo Rizzieri, Politecnico Di Milano
• Application of Interparticle Spacing Model to Maximize Filler Content in Concrete by Denise Silva, Oak Ridge National Laboratory
• Unraveling the Mechanisms of Calcium Aluminosilicate (CAS) Glass Dissolution by Luis Ruiz Pestana, University of Miami
• A Framework for Self-Sufficient Reactive Transport Modeling of Concrete with Low-Carbon Foot-Print by Burkan Isgor, Oregon State University
• Multi-Objective Optimization of a Sustainable Ternary Mortar for 3D Printing by Willy Jin, Ecole De Technologie Superieure
• From Experimental Silica Fume Dissolution to Microstructure Modeling and Hydration Kinetics Simulation by Mine Ucak-Astarlioglu, Engineer Research and Development Center

Ultra-high-performance concrete (UHPC) is a material with impressive mechanical and durability properties which can allow for more resilient, durable, and sustainable structures. One promising application of UHPC is in columns, where its high compressive capacity can allow for more efficient and compact designs. The high energy absorption capacity of UHPC also makes it ideal for seismic and extreme load applications. UHPC also shows great potential as retrofit material which can be used to strengthen and rehabilitate existing building and bridge columns.

The objective of this session is to present the latest innovative applications in UHPC columns in new and existing structures. The session will invite international speakers to share their latest research and practical applications of UHPC in columns.

• Effect of Transverse Reinforcement Detailing on Axial Behavior of UHPC Columns by Hassan Aoude, University of Ottawa
• Seismic Behavior of Fully Precast UHPC Columns with Recycled Fibers by Mohamed Moustafa and Allan Romero, University of Nevada, Reno
• Confinement Effects of Spirals and Hoops on Axial Behavior of UHPC Columns by Milana Cimesa, University of Nevada Reno
• Bond-Slip Behavior of Reinforced UHPC Under Flexure: Experiments and Prediction by Yi Shao, McGill University
• Moment-Rotation Response of Reinforced UHPC Columns under Varying Axial Loads by Matthew Bandelt, New Jersey Institute of Technology
• Modeling of Peak and Ultimate Stress-Strain States in Confined Ultra-High-Performance Concrete (UHPC) Using Novel Hybrid Machine Learning Approach with Conditional Tabular Generative Adversarial Network by Tadesse Wakjira, University of British Columbia, Okanagan Campus

Join us for an engaging session aimed at addressing the challenges associated with varying Concrete Testing Requirements and Standard Practices across the globe. In today's interconnected world, it has become imperative for the construction industry to adapt to the expectations of international firms, who often seek adherence to their own testing procedures and construction processes. However, navigating these differences is far from straightforward. In this session, esteemed experts will share their experiences of encountering these differences while working in Europe, Latin America, and the USA.

• A Perspective on the North American Approach to Performance Requirements and Standards for Concrete by Oscar Antommattei, Kiewit Engineering Group Inc.
• Unification of Standards - An Industry Goal by Vojtech Tauber, Sika Corporation
• Helping our World Work Better with Standards: Connecting the Dots with ASTM International by Cesar Constantino, Cemai Inc – Cement Intelligence
• Canadian Adoption of Performance Standards by R Doug Hooton, University of Toronto

This session will highlight recent research and methods to characterize, control and optimize the electrical and thermal properties of concrete; multiscale analysis evaluation and tailoring of conductivity and energy storage or dissipation of the interfaces and interfacial transition zone (ITZ) and link with bulk properties; and simulation and/or prediction of impedance profiles.

• Using Electrical Measurements to Categorize Material Anisotropy and Defects by Jason Weiss, Oregon State University
• Measuring Thermal Performance of Pavements Containing Phase Change Materials and Modeling Their Macroscale Response by Avinaya Tripathi, Arizona State University
• Multiscale Characterization and Modeling of Electron Kinetics in Concrete Engineered with Multidimensional Carbon-Based Nanomaterial Networks by Panagiotis Danoglidis, University of Texas At Arlington
• The Influence of Accelerating Admixtures on the Electrical Resistivity of Cement Pasts by Luca Montanari, University of Texas Austin
• Stress/Damage Detection with Smart Concrete by Hua Liu, University of Wisconsin-Milwaukee
• Carbon-cement supercapacitors: A disruptive technology for renewable energy storage by Damian Stefaniuk, MIT

This session will highlight recent research and methods to characterize, control and optimize the electrical and thermal properties of concrete; multiscale analysis evaluation and tailoring of conductivity and energy storage or dissipation of the interfaces and interfacial transition zone (ITZ) and link with bulk properties; and simulation and/or prediction of impedance profiles.

• Tunable Thermal Properties of E-Conducting Concrete for Energy Conversion, Storage and Dissipation by Panagiotis A. Danoglidis, University of Texas at Arlington
• Strain Sensing Ability of Metallic Particulate Reinforded Cementitious Composites: Experiments and Modeling by Avinaya Tripathi, Arizona State University
• Experimental Measurement and Prediction Modeling of Concrete Thermal Conductivity by Yogiraj Sargam, CarbonCure Technologies
• Multiscale Optimization of nCB-Cement Composites; Investigating the Effects of Chemical Surfactants on Dispersion, Electrical Conductivity, and Mechanical Performances by Nancy Soliman, Texas A&M University-Corpus Christi
• A New Scalable Method for the Dispersion of Carbon Nanotube - Alumina Hybrid Nanomaterials in Concrete: Effect on Mechanical Properties, Electrical Conductivity and Strain Sensing Ability by Ricardo Silvy, Chasm Advanced Materials

Machine Learning-Informed Construction and Design is a new ACI committee started in Spring 2023. This session will provide an overview of the mission and objectives of the committee which include educating how machine learning methods can help improve how we analyze, visualize, and utilize data that is produced in our industry. In addition, several presentations will highlight the different applications and methods that currently exist in the concrete industry and how they can be applied to practical situations.

• Leveraging Machine Learning to Better Understand Structural Behavior of Concrete Components under Extreme Loads by Stephanie Paal, Texas AM University
• Application of Data Science Techniques to Estimate Soluble Alkali Contribution from Fly Ashes for Determination of Concrete Pore Solution Chemistry by Pravin Saraswatula, Texas A&M Transportation Institute
• Example of Day-to-Day Adoption and Benefits of AI Tools in the Concrete Industry by Sarah De Carufel, Giatec Scientific Inc.
• Bayesian Machine Learning for Modeling and Design of Ultra-High-Performance Concrete by Kimberly Kurtis, Georgia Institute of Technology
• Causality Versus Correlation in the Ready-Mix Industry Through use of IOT Systems by Nathan Tregger, Verifi LLC
• Modeling Hydration Kinetics of Sustainable Cementitious Binders Using a Data Informed Nucleation and Growth Approach by Taihao Han
• How to Optimize Concrete Deliveries Using Machine Learning and Concrete Truck On-Board Sensors by Pierre Siccardi, Command Alkon
• AI-Assisted Design of Low-Carbon Cost-Effective Ultra-High-Performance Concrete (UHPC) by Weina Meng, Stevens Institute of Technology
• Meta-Heuristic Optimization: Effective Machine Learning Techniques for Concrete Structures by Nima Khodadadi, University of Miami
• Exploring Machine Learning to Predict Concrete Field Performance Against Alkali-Aggregate Reaction (AAR) by Ana Bergmann, University of Ottawa
• Damage Identification in Concrete Structures Using Physics-Informed Neural Networks (PINNs) by Rui Zhang, Pennsylvania State University

This session is sponsored by NEU: an ACI Center of Excellence for Carbon Neutral Concrete and will be geared toward all stakeholders, researchers, and students in the concrete industry. Attendees will have the opportunity to learn about new materials and technologies to reduce carbon emissions in cement and concrete industry, NEU technology validation/verification program status, ACI code advocacy efforts, and status of codes and standards on the use of low carbon cement and concrete low carbon cement and concrete materials.

• Introduction to NEU by Sureka Sumanasooriya, American Concrete Institute
• NEU Material and Technology Validation/Verification Program by Mahmut Ekenel, American Concrete Institute
• Carbon Neutral Concrete Materials and Technologies 2023, What to Implement Now and What is Coming by Mary Christiansen, University of Minnesota Duluth
• Changes to ASTM Cement & Concrete Standards to Facilitate Sustainable Initiatives by R Doug Hooton, University of Toronto
• Code Development - Overview and Opportunities by Stephen Szoke, American Concrete Institute

3D printing has exploded onto the scene of concrete construction technologies, bringing with it a renewed appreciation for workability in all its aspects. This session will cover advances and challenges in characterizing, controlling, and predicting the workability of 3D-printed concrete, from case studies to research applications. This session is suitable for people new to 3D printing, as well as those experienced with 3D printing.

• Selecting the Appropriate Quality Control Method for 3D Concrete Printing: A First Guideline by Atta Rehman, Yonsei University
• Multi-Objective Optimization of a Sustainable Ternary Mortar for 3D Printing by Willy Jin, Ecole De Technologie Superieure
• Testing Rheological and Fracture Properties of 3D-Printable Concrete in the Fluid-to-Solid Open Time Window by Andrea Marcucci, Polytechnic University of Milan
• Practical Consideration of Concrete 3D Printing Technology in Culvert Manufacturing by Alireza Hasani, University of North Dakota
• Development of a Real-Time Geometric Quality Monitoring System for 3D Printed Concrete Filaments Using a Rotating Nozzle and 2D Laser Detection by Jung-Hoon Kim, Yonsei University
• Matric Suction and its Effect on the Shape Stability of 3D Printed Concrete by Jae Hong Kim, KAIST
• Using Vibration to Control the Rheology of Concrete for 3D Printing by Karthik Pattaje, WIE
• Rheological Characterization of 3D Printable Mixtures Beyond Flow Initiation by Ala Eddin Douba, Purdue University

The purpose of this session is to offer authors/speakers an open forum for presentation of recent technical information that does not fit into other sessions scheduled for this convention. Any aspect of structural analysis or design, concrete materials science, or construction, manufacturing, use, and maintenance and health monitoring of concrete structures and products can be presented.

• Investigating Interface Shear Resistance through Slant Shear Tests: A Critical Review of Current Design Codes by Brandon Li and Andrea Campos Sanchez, The University of Texas At Austin
• Data-Driven PSO-CatBoost Machine Learning Model to Predict the Compressive Strength of CFRP-Confined Circular Concrete Specimens by Nima Khodadadi, University of Miami
• Predicting Concrete Permeability for Service Life Models by Bruno Fong Martinez, Kiewit
• Synergistic Effects of Denaturing Chemicals and Proteins on the Air-Entraining Behavior in Concrete by Sadegh Tale, University of Miami
• As the Drum Rolls: Transforming the Role of the Concrete Delivery Professional by Beth Unger, MIT
• Enhancing the Performance of Fiber-Reinforced Concrete by Using a Two-Stage Mixing Approach by Onur Ozturk, Cornell University
• Feasibility of Using High-alkali Natural Pozzolans and Reclaimed Fly Ash as Alternative Supplementary Cementitious Materials in Concrete by Weiqi Wang, Clemson University
• Does Prescriptive Seismic Detailing for Concrete Tilt-Up Panels Really Apply? by Viswak Duddupudi, Rafik Gerges, Weian Liu, HSA and Associates; John Wallace, UCLA
• Development of a Streamlined Framework for Probabilistic and Comparative Life Cycle Assessment of Concrete Pavements by Haoran Li
• Reactivity of Alternative Supplementary Cementitious Materials by Sivakumar Ramanathan, University of Miami

Awarded authors of papers published in 2022 will present winning papers. Awarded categories include: the ACI Concrete International Award, the ACI Symposium Volumes Award, the Mete A. Sozen Award for Excellence in Structural Research, the Wason Medal for Materials Research and the Wason Medal for Most Meritorious.

• Reinforcement Congestion in Cast-in-Place Concrete by Oscar Antommattei, Kiewit Engineering Group Inc.
• Diagnostic Load Testing and Refined Analysis of Concrete Box Culverts by Amir Gheitasi, Parsons
• Strength Reduction Factors for ACI 318 Strut-and-Tie Method for Deep Beams by Victor Aguilar, Robert Barnes, Auburn University
• Effect of Slag Characteristics on Adiabatic Temperature Rise of Blended Concrete by Catherine Lucero, US Bureau of Reclamation
• Shear Reinforced Concrete Breakout Failure by Ben Worsfold, Univeristy of Minnesota

This session will illustrate the benefits of deploying performance-based earthquake engineering of bridges in the central and eastern US. This will include an overview of PBEE code provisions, methods of analysis and design for PBEE of bridges, case studies of bridges designed with PBEE, and challenges for implementation.

• Risk-Targeted Ground Motions and Their Implications for Bridge Design in the CEUS by Lee Marsh, WSP USA Inc
• Seismic Design of Bridges in the New Madrid Seismic Zone by Timothy Huff, Tennessee Tech University
• Seismic Design Considerations for Carolina Bridges by Ty Stokes, HDR
• Seismic Design: How ABC Bridge Connections Can Help Improve Infrastructure Resilience in CEUS by Julio Alfredo Samayoa Avalos, North Carolina State University

The special session will focus on advances in the quantification, damage mitigation, and preservation of concrete bridges and structures. Of interest are presentations concerning a wide variety of technical aspects from laboratory experiments to field applications. Specific subjects include quantification methodologies, state-of-the-art evaluation techniques in both destructive and non-destructive approaches, mitigation strategies, and practical rehabilitation methods under assorted natural and man-made hazards such as earthquake, tsunami, hurricane, blast, and fire. Case studies are considered appropriate. The session will bring to light recent research findings and best practices and will provide an opportunity to discuss present challenges and technical demands. The session will benefit those who lead the design and construction of bridges and structures toward resilient and sustainable built environments.

• Blast Load Prediction for Deflagration of Low Explosives in Confined Structures by Ming Liu, NAVFAC - EXWC
• Mixture Design of Sustainable Nano-Engineered High-Performance Concrete (nHPC) Overlay for Concrete Bridge Decks in Cold Regions by Jialuo He, Washington State University
• Simplified Moment-Rotation Relationship for Plastic Hinge of Coupling Beams by Hyeon Jong Hwang, Konkuk University
• Structural Performance of Precast and Cast-in-Place Composite Concrete Beams with Dapped End by Tae-Sung Eom, Dankook University
• Transitional Masonry Facades: Hidden and Unforeseen Hazards, Part 1 by J Gustavo Tumialan, Simpson Gumpertz Heger Inc
• Achieving Multi-Hazard Resilience of Bridge Infrastructure under Extreme Loading by Vasant Matsagar, Indian Institute of Technology (IIT) Delhi
• Experimental Evaluation of Effects of Dead Loads on Capacities of Anchors in Shear Induced by Earthquake in Highway Bridge by Sung-Chul Chun, Incheon National University
• Transitional Masonry Facades: Hidden and Unforeseen Hazards, Part 2 by Greggrey Cohen, Simpson Gumpertz Heger Inc
• Enhancing the Resiliency of Critical Lifeline Bridges in Coastal North Carolina: The Harkers Island Bridge Replacement Project by Rudolf Seracino, North Carolina State University
• Simplified Shear Strength Model of RC Slender Walls by Sung Hyun Kim, Seoul National University
• Performance of Retrofitted Reinforced Concrete Bridge Columns in Cascadia Subduction Zone Earthquakes by Christopher Motter, Washington State University

Deleterious reactions involving concrete aggregate is one of the most critical durabilIty issues facing the industry. Research and development of test methods and guidance documents regarding alkali aggregate reactions (ASR/ACR) and sulfides (pyrrhotite & pyrite) in concrete aggregate are continually advancing. Often times education regarding guidance documents, test methods and specifications are not up to date and in agreement with each other. Additionally, the topics are complicated and guidance documents often difficult to follow. We intend for these sessions to update industry professionals at all levels from aggregate and concrete producers to design engineers and owner representatives on new test methods that have been approved by AASHTO but not in ASTM or ACI documents, provide explanation on how to navigate existing guidance considering these newer test methods, and provide update on research regarding pyrrhotite in concrete aggregates.

• Updates to the ACI 201.1R Chapter on Aggregate Reactions by Matthew Adams, New Jersey Institute of Technology
• Improving the Guidance to ASTM C1778 for Preventing Alkali-Silica Reaction in Concrete by Thano Drimalas, University of Texas at Austin
• Using a Combined CT Scan/Scanning Electron Microscope (SEM/EDX) Protocol to Appraise and Better Understand ASR-Induced Expansion and Deterioration in Concrete by Leandro Sanchez, University of Ottawa
• Innovative Performance-Based Approach Using Emerging Test Methods to Evaluate ASR Mitigation Effectiveness of Conventional and Alternative SCMs by Anol Mukhopadhyay, Texas A&M Transportation Institute
• Assessment of Aggregate Reactivity Using an Ultra-Rapid Autoclave Test Method by Stephanie Wood, US Army ERDC
• MCPT Based Approach Towards Evaluating ASR Potential of Job Concrete Mixtures by Prasada Rangaraju, Clemson University
• Environmental Conditions in Concrete Housing Foundations Walls Incorporating Reactive Sulfide-Bearing Aggregates: Results from On-Site Monitoring Over a Year Period by Rodolfo Castillo-Araiza, Université Laval (crib-Ulaval)
• Development and Application of a Test Method to Determine the Content of Sulfates and Sulfides in Concrete Foundations by Leana Santos, University of Connecticut
• Pyrrhotite Oxidation - Insights into Laboratory Testing of Concrete Expansion and Deterioration, and the Acceleration of Reaction Rates by Sampa Akter, University of Connecticut and Meshach Ojo, University of Connecticut
• Direct Pyrrhotite Testing and Map Cracking Risk Assessment Using a Magnetic Susceptibility Loss and Total Sulfur Method by Jonathan Gourley, Trinity College

These two sessions will explain how silica fume lends to heightened sustainable and resilient construction. License design professionals, contractors, producers, and students will learn how silica fume lends to the overall lowered embodied carbon in structures. Topics will include extending service life through enhanced durability with silica fume, reducing member size in design when using silica fume concrete, increasing particle packing in concrete mixtures (SCC and HPC), and reducing water and cementitious material content when using silica fume in concrete pumping. In addition, case studies will exemplify the lowered embodied carbon and sustainable and resilient benefits to construction projects.

• Concrete for a Millennium: The Great Stupa of Dharmakaya by Robert Lewis, Ferroglobe PLC
• Performance-Based Multi-Property Concrete Mixtures by Kevin MacDonald, Beton Consulting Engineers LLC
• Performance-Based Concrete Mixtures for Durable Long-Life Bridges by Julie Buffenbarger, Beton Consulting Engineers
• A Global Approach on Pavement Sustainability by Julie Buffenbarger, Beton Consulting Engineers

This session will feature presentations of original, unpublished results from ongoing research projects and leading-edge concrete technology and research throughout the world.

• Accelerated Diffusion Testing of Concrete with X-Ray Imaging by Niloofar Parastegari, Oklahoma State Universitypeaker
• Measurement and Characterization of Chloride Transport Properties for Belitic Calcium Sulfoaluminate (BCSA) Cement Concrete by Tayyab Adnan Habibur Rahman, Clarkson University
• Micromechanical and Microstructural Analysis of Lunar Concrete by Mohammad Sulaiman Dawood, Clarkson University
• Revolutionizing Ultra-High Performance Concrete: Unleashing Metakaolin and Diatomaceous Earth as Sustainable Fly Ash Alternatives by Meghana Yeluri, Cleveland State University
• Experimental and Analytical Work in Retrofitted Non-Ductile Reinforced Concrete Shear Walls by Ann Albright, Virginia Polytechnic Institute & State University
• Evaluation of Chloride-induced Corrosion in Reinforced Calcined Clays and Volcanic Ashes Based Alkali-activated Concretes by Shubham Mishra, Clarkson University
• Compressive Fatigue Testing A New Approach by Mohsen Mineijavid, Tufts University
• Behavior of Headed and Hooked Reinforcement Anchored in Beam-Column Knee Joints by Kinsey Skillen, Texas A&M University
• Aggregate Morphology in Cement-Based Materials by Chang Hoon Lee, Western New England University
• Application of Natural and Synthetic Nano-/Micro-Fibers in 3D Printed Cementitious Composites by Abdullah Al Fahim, Temple University
• Ultra High-Performance Concrete (UHPC) as a High Friction Surface Treatment (HFST) Binder by Kyle Maeger, Clemson University
• Evaluation of Hollow-Core-FRP-Concrete-Steel Column and Footing Connection by Omar Yadak, University of Oklahoma
• Statistical Physics for Quasi-Brittle Fracture by Ariel Attias, Massachusetts Institute of Technology
• Seismic Performance of a Novel Corrosion-Free Beam-Column Made with UHPC, FRP, and Stainless-Steel Materials by Yilei Shi, Syracuse University
• Experimental and Analytical Study on the Shear Behavior of Ultra-High-Performance Concrete (UHPC) Considering Axial Load Effects by Dimitrios Kalliontzis, University of Houston

Most professionals in the concrete industry understand that concrete will crack and expects concrete to crack; however, there seem that there is always a dispute about cracks in concrete. So, when cracking becomes a problem, who is responsible for the cracks. Some of these disputes have resulted in significant repair cost or the cost of removal of concrete structures. This program discusses the responsibilities of the design engineer, general contractor, concrete contractor, concrete producer, and others in determining which member(s) of the Project Team is responsible for resolution. This session should be attended by anyone who has ever been involved in a dispute pertaining to cracks in concrete.

• Cracking Expectations by Calvin McCall, Concrete Engineering Consultants Inc.
• Who is Responsible When Concrete Cracks? A Practicing Engineer's Perspective by Frank Malits, Cagley & Associates Inc.
• The Contractor’s Execution - Should Means and Methods Eliminate Cracking? by Oscar Antommattei, Kiewit Engineering Group Inc.

Structural health monitoring (SHM) and nondestructive testing (NDT) are frequently employed to assess or track the condition of concrete structures. While SHM and NDT are frequently discussed in the same context, and the terms have even been used interchangeably, they refer to different techniques and have their own distinct objectives. However, confusion persists within the industry about what constitutes NDT and what constitutes SHM; in some instances, certain techniques are categorized as both SHM and NDT. Additionally, terms like nondestructive evaluation (NDE), nondestructive inspection (NDI), and structural monitoring, among others, are also used. ACI Committees 228 (Nondestructive Testing of Concrete) and 444 (Structural Health Monitoring) are working to formalize the distinction between SHM and NDT and define terms used in these fields. Ultimately, this will lead to a better understanding and increased adoption of SHM and NDT within the concrete industry.

The primary goal of this forum is to alleviate confusion within the industry about the distinction between SHM and NDT. The forum will define SHM and NDT, explain the relationship between them, and give examples of how they are applied within the concrete industry. The forum will introduce the development of SHM and NDT, discuss the current state of the art, their inter-relations, and provide a vision for future directions in both areas.

• Same Physics - Different Approaches by Thomas Schumacher, Portland State University
• Don't Let Letters Get in the Way of Understanding by John Popovics, University of Illinois at Urbana-Champaign
• Commonly Used NDT Methods by Nicholas Carino, Concrete Technology Consultant
• NDT and SHM: Are They the Same? by Mohamed ElBatanouny, Wiss, Janney, Elstner, Associates, Inc.

Concrete structure design is constantly evolving to incorporate new materials and analysis methods to produce structures that are both more robust and more efficient. The 5th ACI / JCI Joint Seminar, to be held at the ACI Convention in Spring 2023, will explore the advancement of design through sessions that focus on design of concrete components, advancements in concrete materials, design for seismic performance, and development of sustainable solutions. The ACI / JCI Joint Seminar is the fifth joint seminar co-sponsored by the American Concrete Institute and Japanese Concrete Institute. The seminars are intended to bring together researchers and practitioners from both organizations to share knowledge with the broader ACI / JCI communities and develop future collaborations.

The session will focus on new developments in sustainable concrete construction. The presentations will focus on development of methods to evaluate sustainability, measures to increase the sustainability of concrete construction and development of codes for sustainability.

• Evaluating the Sustainability of Concrete with Multicriteria Analysis by Michael Henry, Shibaura Institute of Technology
• Hyaloclastite based Natural Pozzolanic Material Performances by Romeo Ciupeca, Greencraft
• State-of-the Art on Development of Concrete and Related Technology to Offset Carbon Emission in Japan by Ippei Maruyama, Nagoya University
• Sustainability and the ACI Building Code: Plans for the 2025 Edition of ACI 318 by Andrew Taylor, KPFF Consulting Engineers

This session is designed to begin expressing the advancements in the industry for engineering tilt-up panels for projects requiring seismic performance; insulation; and excessive threshold loading. Sessions will offer the latest in risks for misinterpreting the application of the slenderness wall method and how panels behave under various loading conditions.

• Pitfalls of Deviating from ACI 318 Slender Wall Provisions by Trent Nagele, VLMK Consulting Engineers
• Concrete Tilt-Up Panels: Retrofitting Panels Beyond Their Design Limits by Doug Antholz, Tetra Tech
• Testing of Partially Composite Insulated Wall Panels by Marc Maguire, University of Nebraska-Lincoln

The objective of this session is to bring together state of the art data-driven methods applied in structural health monitoring and present how they can assist practitioners, researchers, and infrastructure managers in assessing the performance and condition of structures.

• A Hybrid Approach for Prediction of Long-Term Behavior in Concrete Structures by Mauricio Pereira, Princeton University
• Use of Artificial Intelligence for Analyzing Structural Health Monitoring Data from Concrete Structures by Harshita Garg, University of Leeds
• Categorization of Passive and Active Ultrasonic Stress Wave-Based Monitoring Data from Concrete Structures Using Sequential K-Subspaces by Thomas Schumacher, Portland State University

Since the original structural plain concrete code language (ACI 318-14 Chapter 14) was developed in the late 1960's the concrete industry has seen significant developments in materials and analysis methods. The session will focus on examples of the use of such approaches in structural ground supported slabs, walls and foundation elements.

• Collaborative Casting with Robotics by Joseph Sarafian and Ron Culver, Form Found Design
• Three-Point Bending Tests of Notched Beam: A Suitable Test to Investigate Size Effect of Plain Concrete by Christian Carloni, Case Western Reserve University
• Behavior and Design of Lightly Reinforced Concrete Walls by Laura Lowes, University of Washington

Nathan Hamilton first joined Allied Works in 1997 as a member of the Wieden+Kennedy project team, and returned in 2008 to take on the role of Project Architect for Pixar Animation Studios in Emeryville, California. Since that time he has been instrumental in the development, detailing and supervision of major civic, cultural and hospitality projects in the US and internationally. A native of Klamath Falls and graduate of the University of Oregon, Nathan's depth of experience with diverse building types and material systems, and his experience integrating enduring design principles has given him the ability to incorporate innovative concepts and strategies into all facets of complex and extremely sensitive building projects from concepts through construction.

• National Veterans Memorial and Museum NVMM by Nathan Hamilton, Allied Works Architecture

This session is geared towards the design professional and the concrete contractor and will focus on field applications for cost effective solutions using high-modulus GFRP reinforcement.

• ACI 440— Review of Design Guide Becoming Code in 2022 by Alicia Eikenberry, AMDE Structural Consulting LLC
• Misconceptions Regarding Use of GFRP as Internal Reinforcement by David Lai, Wood Environment and Infrastructure Solutions
• Real World Considerations & Project Highlights by Josh Hanje, TUF-N-LITE LLC
• The National Veterans Memorial and Museum Project by Nigel Carter, Turner Construction

ACI 441 and 341 Committees will be co-sponsoring a session on nonconventional reinforced concrete columns/piers during the ACI Spring Convention 2022. This session aims to provide a platform to understand the behavior, design, and construction challenges on nonconventional/atypical columns. Challenges from design to constructions related to such columns/piers will be discussed and innovative solutions will be debated for their improved performance. Columns/piers that do not fall within the scope of conventional reinforced concrete columns/piers are referred to here as nonconventional/atypical columns/piers. Such structural elements cover a wide range as they can be observed in the present construction practices and various research labs. The increase in demand for taller buildings, longer span and irregular bridges, longer service life, and shorter construction time impose new challenges on engineers to devise/implement new materials, structural shapes, reinforcement arrangements, and types to meet these demands. Columns being the main structural elements are the most vulnerable in structures. Hence, the objective is to present the latest in analysis and design.

• The Seismic Performance of Smooth Reinforcing Bars in RC Columns by Jessi Thangjitham, North Carolina State University
• Investigation of Mechanical Splices for Titanium Alloy Bars by Mahesh Acharya, Idaho State University
• Precast Bridge Bents with Replaceable Fuses by Kallan Hart, South Dakota State University
• Seismic Performance of an Innovative Concrete Pier Reinforced with Titanium Alloy Bars by Mahesh Acharya, Idaho State University
• Probabilistic Seismic Risk Assessment of Concrete Bridge Piers Reinforced with Ni, Cu, and Fe-Based Shape Memory Alloys by Meraj Rubayat Kamal, The University of British Columbia
• Analysis of an Innovative Seismic Resilient Precast Pier System by Ali Shokrgozar, Idaho State University
• Plastic Hinge Length of Shape Memory Alloy (SMA) Reinforced Concrete Bridge Columns by Meraj Rubayat Kamal, University of British Columbia
• Software for the Analysis of Concrete Column Sections Reinforced with GFRP Bars by Hayder Rasheed, Kansas State University

This session will feature presentations related to covering topics in Concrete Materials and Reinforced Concrete at the undergraduate level using virtual formats as a result of the COVID-19 pandemic. The session will include presentations focused on both lecture and lab components of each course for various topics specifically noting what worked, what didn't, and what was learned that could be used moving forward. The session will also include a presentation by the Walter P. Moore Award Winner.

• Converting a Large, Project-Based Course to a Hybrid Modality by Jacob Henschen, University of Illinois Urbana-Champaign
• Experiential Hybrid and Online Laboratory Exercises by Armen Amirkhanian, University of Alabama

The objective of this technical session is to provide information regarding research, construction, sustainability, and resilience of airfield concrete pavements.

• Research Update on the Airport Pavement Technology Program by Peter Taylor, National Concrete Pavement Technology Center
• Designing for Improved Airfield Pavement Resilience by Greg Dean, Carolinas Concrete Paving Association
• Carbon Reduction Strategies for Concrete Airfield Pavements by Thomas Van Dam, Nichols Consulting Engineers
• Case Study: JFK International Airport Runway 13L-31R by Mark Wierciszewski, Port Authority of NY NJ

Today’s designer and contractor have to be more sophisticated understanding how tolerances can affect constructability and concrete quality control. Productivity is affected with the constructability of concrete systems. Proper measurement, analysis and application of tolerances can enhance the constructability and concrete productivity. An overly conservative design approach generates an expensive solution.

• ACI 117 Specification Section 8 Paving: New Research on Paving Thickness Tolerances by Jim Cornell, JN Cornell Associates, LLC
• Pavement Concrete Thickness Study by Tim Manherz, Encore Concrete Construction, LLC
• Analysis of Measured Parking Lot Data by Bruce Suprenant, ASCC
• The Trouble with Tall – Managing Creep and Shrinkage Issues in Tall Buildings by Eamonn Connolly, James McHugh Construction Co.

The topic of the iron sulfide mineral pyrrhotite causing damage to concrete foundations has made headlines the past few years in the Northeast U.S. after an area in CT experienced severe degradation affecting thousands of homes. This came after a similar instance in the Trois Rivieres area of Quebec years earlier. This session will focus on educating aggregate, concrete producers, and specifiers about the potentially deleterious reaction of pyrrhotite oxidation in concrete. Most importantly, this session will provide an update to ongoing research of the complex topic that will guide an effort to establish guidelines. The outcome of this session will be an understanding of what the reaction is and the complexity of developing standards to avoid it.

• Development of Accelerated Methods to Evaluate the Deleterious Oxidation Potential of Sulfide-Bearing Aggregate in Concrete by Castillo-Araiza Rodolfo, Instituto De Ingenieria Civil
• Test Methods for Potential Oxidation of Sulphide-Bering Aggregates by Medhat Shehata, Ryerson University
• Crumbling Concrete Foundations Due to Pyrrhotite Bearing Aggregates in CT by Kay Wille, University of Connecticut

The session will emphasize advances in ultra-high-performance concrete (UHPC) for bridges and structures. Presentations will encompass a variety of technical aspects from laboratory evaluation to field demonstration, including custom-formulated UHPC mixtures, field-cast connections and precast applications, rehabilitation for existing members, and combinations with non-conventional reinforcement. The session will bring to light recent research findings and provide an opportunity to discuss present challenges and technical demands. Critical information will be provided to those who lead the design and construction of bridges and structures, including practicing engineers, government officials, and academics.

• UHPC Alternative for the West Wilson Bridge by David Gee, University of Nebraska Omaha
• Structural Design Guidance for UHPCs by Benjamin Graybeal, Federal Highway Administration
• Large Reinforcing Bars Spliced in UHPC by Christina Freeman, FDOT
• UHPC Fresh Chloride Limit Testing by Raid Alrashidi, University of Florida
• Use of UHPC H-Piles for an Abutment at the Lily River Detour Bridge in Ontario Canada by Philip Loh, Iowa State University, Facca Incorporated and Sri Sritharan, Iowa State University
• UHPC Overlays for Suspension Bridges – The Why & How? by Vic Perry, ceEntek North America
• Cyclic and Strength Performance of Slab-Beam Superstructure System with UHPC Closure Pour by Francisco Chitty, FINFROCK
• The Double-Punch Test for UHPC Quality Control by Megan Voss, University of Florida
• Bridge Preservation with UHPC Overlays by Peter Seibert, UHPC Solutions North America
• Effect of Tensile Strength and Ductility of UHPC on the Development Length of Steel Reinforcement by Amr Soliman, SUNY University of Buffalo
• Electromagnetic Non-destructive Testing of Ultra-High Performance Concrete (UHPC) by Christopher Ferraro, University of Florida
• Bonding of Polyester Polymer Concrete (PPC) to Ultra-High-Performance Concrete (UHPC) by Abass Okeola, University of Delaware and Saber Larfi, University of Delaware

These presentations will highlight the perspectives of engineers, design code committee members and building code officials with regards to the current building inspection, rehabilitation and certification requirements and the proposed code concerns and changes that are currently being discussed in order to maintain a proactive mindset to avert future structural collapses.

• Education and Existing Building Code Perspective by Keith E Kesner, CVM Engineers
• Guidelines for 40-Year Inspection Requirements by Brian Duchene, Terracon Consultants, Inc.
• Call to Arms to Avoid Future Building Collapses by Jose Izquierdo, Principal, PORTICUS CSP

In this session, we will discuss iconic buildings that are unique in their design and/or construction techniques. The design and construction of buildings is challenging; designing and constructing buildings with special designs adds even more challenges. We will talk about those challenges and how the project team overcame them. The discussion will include the project structure and the framework within which the development was accomplished. The session will include different levels of design, materials, and construction.

• The Merdeka 118 Tower in Kuala Lumpur (KL118) by Stephen Herald, Aggregate Industries
• The Great Stupa of Dharmakaya by Robert Lewis, Ferroglobe PLC
• The Museum of Tomorrow by Rafael Timerman, Engeti Consultoria E Engenharia

This session is co-sponsored by RILEM TC266: Measuring Rheological Properties of Concrete in May 2018 (Béthune, France), a subgroup of “RILEM TC266: Measuring rheological properties of concrete” has conducted the third International Round-Robin Test (RRT) on comparing nine concrete rheometers. The RRT was primary focused on workability, flow curves, thixotropy and interface rheology. The goal of the proposed session is to inform academics, contractors, concrete producers, and materials suppliers on the outcomes of this testing campaign.

• How to Run a Round-Robin Test for Concrete Rheometers by Dimitri Feys, Missouri S&T
• Detailed Analysis and Interpretation of Flow Curves from Round-Robin Tests (RRT) on Concrete Rheometers by Dimitri Feys, Missouri S&T
• Evaluation of Structural Build-Up at Rest of Mortar and Concrete Using RRT Data by Sofiane Amziane, University of Clermont Auvergne
• Lessons Learned from RILEM TC MRP Round-Robin Testing of Concrete and Mortar Rheology in Bethune France, May 2018 by Yannick Vanhove, University of Artois

Targeted audience:
- Academic researchers and industry concrete contractors.
- Students, faculty, general contractors, concrete contractors, construction program managers.

• Internal Curing Effect of Concrete Containing Colloidal Nano Silica (CNS) by Cihang Huang, Purdue University
• Cementitious Acoustic Bandgap Sensors for Smart Damage Detection by Shreya Vemuganti, University of Oklahoma
• Nanoengineered C-S-H and C-A-S-H Using Biomimetic Molecules for Enhanced Functionality by Warda Ashraf, University of Texas-Arlington
• Conductive Nanomodified Concrete with Tunable Electrical and Thermal Properties by Panagiotis Danoglidis, University of Texas at Arlington
• Surface-Functionalization of Concrete via Nano-Modified Releasing Agent Design by Pengkun Hou, University of Jinan

Nano-based coatings have revolutionized the ability to control the durability of concrete structures. Presentations will focus on the use of nanocoatings in the laboratory and operational environments. The following session will discuss nano-based coatings for concrete that focus on increasing the strength and durability of concrete to physical and chemical attack as well as value-added properties such as photocatalytic response. The full session will emphasize cement composite and concrete in laboratory and field applications. Pros and cons will be discussed to facilitate a realistic view for new solutions to ongoing issues. Attendees would be academic researchers, government agencies, contractors, engineers, construction managers, and concrete additive/admixtures manufacturers and distributors.

• Superhydrophobic, Ice-Phobic, and Photocatalytic Coatings for Concrete by Filip Zemajtis, University of Wisconsin
• Construction of Hierarchical Surface Structure on Concrete with FAS/SiOHybrid Nanocomposites for Superhydrophobicity by Pengkun Hou, The University of Texas at Arlington
• Spray-Applied Colloidal Nano-Silica for Waterproofing and Deicing Chemical Protection of Concrete Pavements by Alex Rollins, Spray-Lock Concrete Protection
• Effects of Nanomaterials on Engineering Performance of a Siliconate-Based Sealer for Cementitious Composite by Zhipeng Li, Washington State University
• Colloidal Nano-silica for Low Carbon Self-healing Cementitious Materials by Dr. Yen-Fang Su, Purdue University

The purpose of this session is to offer authors/speakers an open forum for presentation of recent technical information that does not fit into other sessions scheduled for this convention.

• Shear Behavior of Spliced Post-Tensioned Girders with Grouted or Ungrouted Tendons by Sangyoung Han, The University of Texas at Austin
• Large-Scale Experimental Investigation of Modular Structural Concrete Insulated Panels by Usha Pant, Idaho State University
• Performance Evaluation and Load Rating of Retrofitted Impact Damaged Non-Composite Steel Girder Bridge Deck by Mohd Mezanur Rahman, University of Texas Arlington
• Numerical Simulation of Cracking Effects and Chloride Concentrations on Corrosion in Reinforced Concrete by Jin Fan, New Jersey Institute of Technology
• Development of UHPC Mixtures and Production of Full-Scale Pretensioned Bridge Girders by Hyeonki Hong, Texas A&M University College Station
• Immobilization of Bacterial Cells on Natural Mineral for Developing Self-Healing Cement-Based Mortars by Ilgin Sandalci, Ozyegin University
• ASR-Induced Anisotropy in the Mechanical Properties of Concrete by Anca-Cristina Ferche, The University of Texas at Austin
• Controlling Parameters in the Design of Concrete Slabs Reinforced with Non-Metallic Reinforcment by Zahid Hussain, University of Miami
• Fire Performance of Hybrid Fiber Reinforced Self-Consolidating Concrete with Glass Pozzolan by Rishabh Kumar, University of Texas Arlington
• Harmonization of Material Specifications for FRP Reinforcing Bars by Hossein Roghani, University of Miami
• Significance of the Fineness of Harvested Fly Ash and Ground Glass Pozzolans by Mahipal Kasaniya, University of New Brunswick

Speakers from Germany, China, Italy, and India are part of the speaker list, and have agreed to present. 3D printing technology is growing at an unprecedented speed. A variety of objects, including houses, bridges, and structural and architectural components, have been printed with various cement-based materials. However, studies on the properties of hardened 3D-printed concrete are still limited. In the commonly used extrusion-based 3D printing process, the layer-by-layer deposition procedure has made the properties of 3D-printed concrete intrinsically different from those of traditional mold-cast concrete. For instance, 3D-printed concrete components may have cellular structures resulting from element configurations and infills, defects caused by filament discontinuity and non-uniformity, and anisotropic behavior depending upon printing and/or loading directions. Thus, special considerations for evaluation and characterization of the properties and performance of hardened 3D-printed cement-based materials are necessary. Recently, some progress has been made to address the related issues through examinations and evaluations of mechanical properties (e.g., compressive, tensile, and interlayer bond strengths), microstructures (bulk filaments and interlayers), and early age volume stability of 3D-printed cement-based materials. This session has participants from the international networks of networks (AccelNet) consortium 3DConcrete.

• Influence of Alkali Free Accelerators on the Early Age Properties of 3D Printable Concrete by Manu Santhanam, Indian Institute of Technology Madras
• Ultrafast Stiffening of Concentrated Thermoresponsive Polymer-Mineral Suspensions by Sharu Kandy, University of California, Los Angeles
• Early Age Response of 3D Printed Systems Evaluated Using Digital Image Correlation by Sooraj Nair, Arizona State University
• Effect of Drying Environment on Mechanical Properties, Internal RH and Pore Structure of 3D Printed Concrete by Yamei Zhang, Southeast University
• Taguchi Design of 3D Printable Concrete Mixtures and Investigation into the Interlayer Properties by Kwangwoo Wi, Iowa State University
• Tough Bio-Inspired Architected Cement-Based Materials by Hadi Esmaeeli, Purdue University
• Performance Characterization of Self-Reinforced Printing Materials for Construction 3D Printing by Ilerioluwa Giwa, Louisiana State University
• Determination of the Hardened Performance of 3D Printed Concrete for Structural Validation by Eric Kreiger, U.S. Army Engineer Research and Development Center
• Sustainable 3D-Printed Concrete Sidewalks with Low Heat Storage by Mahmoud Reda Taha, University of New Mexico

This session will feature presentations of original, unpublished results from ongoing research projects and leading-edge concrete technology and research throughout the world.

• Structural Design, Analysis, and Full-Scale Testing of Ultra-High Performance Concrete Girders by Amreen Fatima, Texas A&M University College Station
• Multifunctional Cement-Based Materials to Improve the Service Life of NPP Concrete Structures by Ashish Patel, University of Florida
• Lessons Learned from Fabrication and Experimental Testing of Prestressed UHPC H-Piles by Gabrielle Willis, University of Alabama
• Shear Bolt Coupler for Splicing FRP Bars by Nafiseh Kiani, University of Miami
• Development of a Rapid Screening Tool to Estimate Fly Ash Dosage for Mitigating ASR in Concrete by Pravin Saraswatula,Texas A&M University College Station
• Chloride Binding Capacity of Pastes and Scaling Resistance of Concretes with Natural and Non-Traditional Pozzolans (NNPs) Exposed to Different Types of Chloride Solutions by Raikhan Tokpatayeva, Purdue University - West Lafayette
• Shrinkage Cracking Control of Concrete Using Non-Metallic Rebars and Meshes by Hossein Roghani, University of Miami
• Microstructure, Mechanical Performance, and Chloride Binding of Seawater Cured Portlandite-Calcined Clay Binders by Ishrat Baki Borno
• Are High-Alkali Natural Pozzolans (HANP) Capable of Mitigating Alkali-Silica Reaction (ASR) in Concrete? by Weiqi Wang, Clemson University
• Effect of Interlayer Time-Lapse and Workability Retention on Printed Concrete by Debalina Ghosh, University of Tennessee
• High-Fidelity Prediction of Temperature and Time-Dependent Heat of Hydration of Blended Cementitious Pastes Using Machine Learning: A Mass Concrete Application by Luna Al Hasani, Georgia Institute of Technology
• Evaluation of Rail Shear at Concrete Tub Crossings by Timothy Mueller, University of Florida
• Evaluation of Strut-and-Tie Method for Drilled Shaft Footings Subjected to Uniform Compression Loading by Hyunsu Kim, University of Texas At Austin
• Experimental Study of Drilled-Shaft Footings Under Uniaxial Flexural Compression Designed with Different Column Reinforcement Anchorages by Yousun Yi, University of Texas Austin
• Effect of Fiber Type and Content on Behavior of UHPFRC for Prestressed Girder Repair by Dip Banik, University of Oklahoma

The Slag Cement Project of the Year Awards program will honor 13 construction projects from across the United States for their outstanding use of slag cement in sustainable concrete. The session will overview each winning project from the categories of Architectural, Durability, Infrastructure, High Performance, Innovative Applications, and Lower Carbon Concrete.

• Improving Sustainability of Ultra-High Performance Concrete by Srinivas Allena, Cleveland State University
• Mechanical, Microstructural, and Durability Characterization of Fly Ash/Slag-Based Geopolymer with Limited OPC and Different Alkaline Activator Ratios by Salem Aldawsari, Florida State University

The Tech Notes produced by ACI Committee 364 cover important aspects of concrete rehabilitation programs, ranging from the initial stages of evaluation, to designing and implementing durable repairs that achieve a long service life.

• Increasing Shear Capacity Within Existing Reinforced Concrete Structures (364.2T) by Sean Radley, Simpson Gumpertz Heger Inc.
• Determining the Load Capacity of a Structure When As-Built Drawings are Unavailable (364.4T) by Lawrence Kahn, Georgia Institute of Technology
• Importance of Modulus of Elasticity in Surface Repair Materials (364.5T) by Benoit Bissonnette, Laval University
• Physical Properties and Characteristics Affecting the Sensitivity to Cracking of Concrete Repair Materials (364.16T) by Keith Kesner, CVM Engineers
• Evaluation and Minimization of Bruising (Microcracking) in Concrete Repair (364. 7T) by Michael Sprinkel, Virginia Transportation Research Council
• Optimum Moisture Content of Substrate Prior to Applying Cementitious-Based Repair Materials (FAQ 28/364.XXT) by Liying Jiang, Jensen Hughes, Inc.

Ultra-high-performance concrete (UHPC) provides mechanical and durability properties which lay the foundation to shape our infrastructure towards being more resilient, longer lasting and more sustainable. The interest in this material in research and the success of it in practical applications would not have been achieved without the dedicated work of our students in the laboratory or in the field. Over the last decades students have not only achieved great success in their endeavors but have also been struggled with failures and setbacks. These sessions encourage all students to share all of it. We want to hear about their success and pride in their results as well as their setbacks, mistakes and frustrations which came with it, their perseverance to keep working with this material, their fun activities and thus, all of their UHPC experiences they like to share. This session will invite national and international research groups, material suppliers and contractors to listen and engage in the UHPC experiences current students or former students like to share.

• Ultra-High Performance Concrete: Traps of the Fresh State by Aghiles Begriche, Universite de Sherbrooke
• UHPC as an Environmentally-Friendly Concrete Material by Hannah Tzabari, National Cement
• Lessons Learned from Non-Proprietary UHPC Mix Design by Megan Voss, University of Florida
• Mixing Kinetics of Ultra-High-Performance Concrete (UHPC) by Jiang Du, Stevens Institute of Technology
• UHPC Shear Strengthening of Concrete T-Beams using UHPC Layeral Layers by Tongxu Liu, Polytechnique Montreal
• UHPC Repair of Steel Columns in the Walnut Tunnel by Michael McDonagh, Steelike, Inc.
• An Experimental Methodology to Assess Fatigue Behavior and Fatigue Damage Recovery by Autogenous Self-Healing of UHPC by Niranjan Prabhu Kannikachalam, Politecnico Di Milano
• From UHPC Graduate Scholars to Technical Field Experts by Hannah Tzabari, National Cement
• Corrosion Performance of Ultra-High-Performance Concrete in Uncracked and Cracked Beams: A Student’s Perspective by Seyed Masoud Shirkhorshidi, New Jersey Institute of Technology
• Innovative UHPC Mixing and Placing Techniques for Repair of Three Illinois Bridges by Michael McDonagh, Steelike, Inc.
• Durability Based Design of UHPC Structures: A Performance Based Approach Based on Extensive Laboratory Research and Long Term in Situ Observations by Alobaidi Politecnico, Di Milano
• Machine Learning-Based Mix Design Tools to Minimize Carbon Footprint and Cost of UHPC by Cesario Tavares, Texas A&M University
• Retrofitting Concrete Beams with Eco-Friendly UHFRC Panels by Oscar Mancinelli, Politecnico Di Torino
• Real Time Plastic Viscosity Prediction Through Video Recognition by Pengwei Guo, Stevens Institute of Technology
• Use of Steel Microfibers, Steel Macrofibers, PVA Fibers, and Hybrid Fibers in UHPC: Experience from Shear Tests and Bond Strength Tests of UHPC Beams by Manuel Bermudez, National Cheng Kung University

The objective of this session is to provide a greater opportunity for undergraduate students to present their research at a national meeting. This session will focus on research conducted predominately by undergraduate students. It is expected that this session will draw a new group of students to ACI and the convention. It will also allow students to hear presentations of a slightly less technical nature that are more in keeping with their current level of knowledge regarding concrete.

• Measuring the Kinetics of Iron Sulfide Oxidation in Model Reactant Systems, Cement Paste, and Mortar by Angelica Hunt, Pennsylvania State University
• Solidification Behavior of BCSA Cement by Abigail Kienzle, Clarkson University
• A Novel Augmented Reality Tool for Visualization in Structural Concrete Design by Jacqueline Chao and Connor Lyons, University of Virginia
• Comparisons of Concrete Slender Wall Software with Full-Scale Experiments by Gloriana Moua, California Polytechnic State University San Luis
• Mechanical Properties of Concrete Ceramic Waste Materials by Mariam Kamil, University of Techno
• Soundproofing of Concrete Masonry Units (CMU) by Jared Reed, University of Houston Downtown

This session will introduce practitioners to the role of workability for successful pavement construction, measures to ensure appropriate workability in the field, modern test methods for pavement workability, and pavement concrete proportioning approaches. The session will also present case studies of the impact of workability on pavement construction from the contractors’ perspective.

• Workability of Mixtures for Slipform Concrete Pavements by Peter Taylor, National Concrete Pavement Technology Center
• Concrete Pavement Consolidation: Matching Vibration Energy to Workability by Paul Jaworski, Minnich Mfg.
• Optimization of Pavement Concrete Based on Theoretical and Experimental Particle Packing Methods and Pavement Workability Test by Jiong Hu, University of Nebraska-Lincoln
• Designing Concrete Mixtures for Constructible Slip Formed Pavements by Tyler Ley, Oklahoma State University
• Field Evaluation of the Tarantula Curve and the Box Test for Assessing/Predicting the Workability of Concrete Paving Mixtures by Jagan Gudimettla

The slump cone has been used for the past 100 years to assess the consistency and workability of fresh concrete. The objective of this session is to reflect on the slump test and provide perspective on how it and other tools can be used to assess fresh concrete properties today as well as in the future. Academic and industry researchers, practitioners and students should attend this session to gain a historical perspective on the slump cone.

• Time-Dependency of the Slump Test, or “What Slump is it Now?” by Kenneth Hover, Cornell University
• Extending the Slump Test to Improve Quality Control Towards Sustainability by Nathan Tregger, GCP Applied Technologies
• Using Slump to Predict Pumping Pressure: A Scientific Fact or a Historical Coincidence? by Dimitri Feys, Missouri S&T

Several key concrete industry organizations have committed to achieving carbon neutrality in the coming decades. ACI established its Center of Excellence for Carbon Neutral Concrete in early 2022. The Portland Cement Association (PCA) released its Roadmap to Carbon Neutrality in late 2021. Advancement and adoption of emerging technologies like direct carbon capture are a step in the right direction, but achieving this lofty goal will also require changes to design codes, standards and specifications. How to implement these changes is a matter of ongoing debate. Codes and standards will also need to change to accommodate nontraditional materials like alternative cements, supplementary cementitious materials, nonmetallic reinforcement, and other emerging technologies that can reduce the carbon footprint of the concrete but are not always compatible with current specifications. This forum will address the strengths and weaknesses of current design codes, standards, and specifications with respect to industry goals for carbon neutraility, and identify opportunities to improve these critical documents to better support the industry's ongoing effort to decarbonize concrete.

A panel of industry experts will discuss the topic from varying perspectives. The session will begin with short presentations by each panelist and conclude with an interactive panel discussion with the audience.

• Accelerating Sustainability with Cement and Cementitious Materials by Eric Koehler, Titan America

The objective of this session is to identify what tools the Licensed Design Professional can employ to efficiently design a more constructible project.

• Constructible Design and Construction Productivity: ACI's New Focus on Both by Cary Kopczynski, CKC Structural Engineers
• Using Structural Concrete as Architectural Concrete by Jim Tkach, Largo Concrete, Inc
• Surface Preparation Requirements and Coating Options for Concrete Tilt Walls by Mark Wafford, Sherwin Williams
• A Condensed Look at Liquid Densifiers by Scott Tarr, North S.Tarr Concrete Consulting, P.C.

This session will highlight recent research on nanoscale and microscale interaction mechanisms at the interfaces between the cementitious hydration products and nanomaterials; methods to characterize, control and strengthen these interactions; quantitative analysis of the interfaces and nanoscale texture of interfacial transition zone; and the link between atomic interactions, interfaces, and bulk concrete properties.

• Investigation of the Effect of the Nanosilica (CNS) on the New-and-Old Portland Cement Concrete Interface by Cihang Huang, Purdue University
• The Importance of Interfacial Chemistry on the Strength of Slowly-Reacting Fly Ash-Cement Composites by Konrad Krakowiak, University of Houston
• Strengthening Interface Interactions in Carbon Based Nanomaterials/Cementitious Nanocomposites via Functionalization by Maria Konsta, University of Texas at Arlington
• Characterization of Aqueous CNT/CNF Dispersions for Use in Cementitious Materials by David Corr, Northwestern University
• Comparative Study of ITZ in Geopolymer and PC Concretes Using Modelled Interfaces by Wengui Li, University of Technology Sydney
• Characterization of the Impedance Profiles of Nanostructured Carbon-Based Material/Cement Interfaces by Panagiotis Danoglidis, University of Texas At Arlington
• Nano Engineering the Interfacial Properties of PVA Fibers in Strain-Hardening Cementitious Composites by Ousmane Hisseine, Laboratory of Nano- and Micro-Mechanics, Laval Uni
• Contact Mechanical Insight into Carbon Nanoreinforced Composites Interactions by Raul Marrero, Northwestern University

The earth's natural resources are being consumed at a very high rate for many years. The potential depletion of resources, CO₂ emissions and high energy consumption rates in the process of production, increase the necessity of recycling. All sectors of the society are responsible for these concerns, especially the construction industry. As a major construction material. concrete is increasingly judged by its environmental impacts and reusing the readily available concrete is becoming very important. Considering that much of the US infrastructures and urban buildings now require renovation and replacement, the concrete left behind can be a valuable source of aggregate for new concrete. Such concrete is usually called Recycled Aggregate Concrete. Through cost analyses, it is shown that using recycling concrete as aggregate for new concrete production can be a cost-effective method for construction.

• Field Application of Cement-free Geopolymer Concrete using Fly Ash, Slag, or Red Mud with Optimized Cost and Performances by Lin Shen, University of Hawaii at Manoa
• A Ready-Mix Producers Method of Designing Recycle Concrete Aggregate Mix to be Used on the Job by Frank Kozeliski, Koz. Consulting & Michele's Ready Mix, Rock & Recycle, Inc.
• Geometrical, Physical, Mechanical, and Compositional Characterization of Recycled Concrete Aggregates by Jiong Hu, University of Nebraska-Lincoln
• Evaluation of Portland Cement and Geopolymer Based Mortars Containing Glass Powder by Xijun Shi, Texas State University and Mehrab Nodehi, Texas State University San Marcos
• Recycled Concrete Aggregate Composition Determined Using a Portable Handheld XRF Device by Tara Cavalline, University of North Carolina At Charlotte
• Mechanical Properties of Concrete Made with Chemically-Produced Recycled Concrete Aggregate (RCA) by Paul Horst Seiler, Master Builders Solutions
• An Experimental Study on Concrete Incorporating Wood Ash as Cement and Fine Aggregate Replacement by Rubaiya Rumman, University of British Columbia
• Development of an Eco-Friendly Glass Fiber Reinforced Concrete Using Recycled Glass as Sand Replacement by Meraj Rubayat Kamal, University of British Columbia

This session provides general information on various analytical techniques used to characterize concrete material properties. The purpose of this session is to provide an overview of available methods and offer guidelines to both, the researchers and practitioners, as to how they can be utilized. For each technique presented, practical information such as best use, sample type, test procedures, results analysis, and limitations will be discussed.

• Advances in X-ray Computed Tomography for the Characterization of Cementitious Materials by David Lange, University of Illinois At Urbana-Champaign
• Differential Scanning Calorimetry in the Study of the Influence of Phase Change Materials in Cementitious Systems by Narayanan Neithalath, Arizona State University
• Isothermal Calorimetry – An Essential Cement Chemist’s Tool by Lisa Burris, Ohio State University
• Applications of Infrared Absorption Carbon/Sulfur Analysis by Sean Monkman, CarbonCure Technologies
• Use of Neutron Imaging for Assessing Concrete by W Jason Weiss, Oregon State University
• Application of SEM-EDS to do Micro- and Nano-structural Characterization and Durability Evaluation of Cementous System by Anol Mukhopadhyay, Texas A&M Transportation Institute
• Principles of Fourier Transform Infrared Spectroscopy and Applications to Alkali Activated Binders by Narayanan Neithalath, Arizona State University
• Application of Advanced X-ray Techniques in Durability Design of Concrete Systems by Mehdi Khanzadeh Moradllo, Oregon State University

The objective of these sessions is to present and discuss different methods for detection and monitoring of surface damage in concrete elements. The focus is how to use SHM techniques to obtain useful information regarding formation and progression of surface damage. These sessions will be of interest to engineers, researchers, and infrastructure owners and operators.

• Condition Assessment of In-Service Structures Using NDE and Monitoring Techniques by Mohamed ElBatanouny, Wiss, Janney, Elstner, Associates, Inc.
• Detection and Characterization of Alkali-Silica Reaction Damage in Concrete Using Surface Wavefield Imaging by Homin Song, Argonne National Laboratory
• Sensing Sheet for Damage Detection Over Large Surfaces of Structures by Branko Glisic, Princeton University
• Challenges with Monitoring Surface and Subsurface Changes in Concrete Due in ASR by Paul Noyce, Echem Consultants LLC
• Case Studies of Data Fusion of Nondestructive Testing and Photogrammetry for Concrete Condition Imaging and Assessment by Marisol Tsui-Chang, Olson Engineering, Inc
• Surface Damage Imaging for Input to Load Rating of Bridges by Paul Ziehl, University of South Carolinae
• Study on Traffic Disruption-Free Bridge Deck Evaluation and Imaging for Large-Scale Stream Data by Suyun Ham, University of Texas at Arllington

Given the increased use of non-traditional materials in the construction and repair of bridges and bridge elements, there is an increased need to develop reliable destructive and non-destructive evaluation methods and techniques to assess their in-service performance. Examples of non-traditional materials include, but are not limited to, fiber-reinforced polymer reinforcement, and ultra-high performance concrete materials. This session will bring to light industry experience in the evaluation techniques and discuss the challenges associated with the assessment of non-traditional materials and current field results. The session will aim to share field experiences and critical information to those involved in the design, evaluation, and inspection of bridges.

• Lessons Learned from Condition Evaluation of UHPC Overlays by Andrew Foden, WSP
• Performance Evaluation of Polymer Concrete Overlays by Mohamed ElBatanouny, Wiss, Janney, Elstner Associates, Inc.

Excellence in Concrete Construction Awards - Project Winner Presentations. First and second place winners of the Excellence in Concrete Construction Awards program will give a presentation on their winning project.

• SCG-CPAC Ultra-High Performance Fiber Reinforced Concrete Bridge by Kritsada Sisomphon, The Concrete Products and Aggregate
• Building 100 Above the Park by Daniel Gorla
• Restore and Reuse the Old Fruit and Vegetable Market of Genoa - Mercato di Corso Sardegna by Agostino Molfino
• Brossard Aquatic Complex by Steve Godin
• The Rose Fitzgerald Kennedy Bridge Across the River Barrow, New Ross, Ireland by Guillermo Ayuso
• Corniche Kennedy in Marseille: Reparation and Preventive Maintenance by Christophe Raulet
• New Winery of the Chateau Haut-Bailly by Francois Toutlemonde, Gustave Eiffel University
• Chau Chak Wing Museum, University of Sydney - The Floating Concrete Box by Aaron Hughes

Panelist representing the major segments of our industry, the licensed design professional, concrete contractor, and concrete producer, will present and discuss examples of constructability challenges, successes, and issues of responsibilities when building with "lower carbon" concrete.

• When Carbon Reduction and Constructability Clash—Who is Responsible for the Fallout? by Kevin A MacDonald, Beton Consulting Engineers LLC
• A Designer’s Dilemmas: Specifying More Sustainable Concrete by Alec Zimmer, Simpson Gumpertz & Heger Inc.
• A Concrete Contractor's Perspective on Lower Carbon Concrete and Constructability by Rick Stone, Madison Concrete Construction Richard W Stone PE Inc
• Lower Carbon Specifications by Rory McCoy, Centre Concrete

Bridge decks in the USA are designed according to the AASHTO LRFD Bridge Design Specifications using various refined and approximate methods. The traditional strip method as well as the empirical method have been applied to reinforced concrete decks. However, with the development of new and innovative construction materials, including nonmetallic rebars and tendons, FRP composites, fiber reinforced concrete, full depth precast decks, as well as other types of materials, there is a need to develop or adjust design philosophies and approaches to capture the enhanced performance of the recent innovations in construction materials for bridge decks.

• Implementation of Fiber Reinforced High-Performance Concrete (FR-HPC) for Bridge Decks in New Jersey by Hani Nassif, Rutgers University
• Accumulated Fatigue Damage in Concrete Bridge Decks by Andrzej Nowak, Auburn University
• Performance and Load Rating of Old/Damaged Girder Bridges by Mostafa Tazarv, South Dakota State University
• Life-Cycle Cost Analysis of Alternative RC Bridge Decks by Christopher Eamon, Wayne State University
• Performance of Fiber-Reinforced Flowable Concrete used in Bridge Rehabilitation by Kamal Khayat, Missouri S&T

To support ACI’s expanding focus on technology and innovation, the CIC collaborates with the concrete community to further innovative solutions for industry-wide challenges, by effectively identifying new technology and helping to nurture and support emerging and mature technologies. The Council also works closely with ACI’s Director of Concrete Technology to create a formal connection between Council work and ACI. The council is comprised of a diverse set of industry representatives - material suppliers, architecture & engineering firms, contractors, academic, owner and regulatory.

The objective is to identify technologies and innovations that are aligned with ACI and industry strategies and help implement their use when appropriate.

• Innovations in Concrete Technology by Brian H Green, U.S. Army Corps of Engineers
• Innovations in Next Generation UHPC and Sustainable Nanotechnology by Larry Rowland, ceEntek North America
• Understanding ICC-ES AC509 for 3D Construction Printing Codes - and What is Next for 3DCP Materials by George Perry, Black Buffalo

In this session, we will discuss iconic buildings that are unique in their design and/or construction techniques. The design and construction of buildings is challenging; designing and constructing buildings with special designs adds even more challenges. We will talk about those challenges and how the project team overcame them. The discussion will include the project structure and the framework within which the development was accomplished. The session will include different levels of design, materials, and construction.

• FRP Reinforcement for Concrete Structures—Coming of Age at Last by Antonio Nanni, University of Miami
• Streamlining the Innovation Process by Julissa Hidalgo, Master Builders Solution US LLC

The evolution of the seismic design provisions in response to the lessons learned from previous earthquake events has led to the development of new design methodologies such as performance-based design (PBD). A key component of PBD is to lay out the engineering demand parameters identifying the initiation of different damage states (e.g., yielding, spalling, bar fracture, etc.). In this regard, reliable knowledge of structural members’ strength and deformation capacities is required, and it is often obtained through quasi-static cyclic testing programs. The selecting of an appropriate loading protocol is crucial in these programs to achieve.

• Guide for Testing Reinforced Concrete Structural Elements under Slowly Applied Simulated Seismic Loads by Murat Saatcioglu, University of Ottawa
• Comparing Uni- and Bi-Directional Tests on RC Walls by Katrin Beyer, EPF Lausanne

The objective of the session is to provide an overview of the newly adopted AASHTO Performance-Based Seismic Design guidelines for bridges. Bridge designers should attend this session, and learning outcomes include: the relationship of these guidelines with other AASHTO specifications, why they were created, examples of application, and potential knowledge gaps that ACI members may be able to help fill. This session is jointly sponsored by the Transportation Research Board Standing Committee on Seismic Design and Performance of Bridges.

• Overview of the New AASHTO Performance-Based Seismic Design Guideline by Lee Marsh, WSP USA Inc
• New AASHTO PDSD Guidelines - SDOF Column Investigation and Results by Chad Goodnight, HDR, Inc
• Application of the New AASHTO PBSD Guidelines - Design Examples by Stuart Bennion, WSP USA
• Performance-Based Seismic Design of Bridges – Canadian Perspective by Saqib Khan, Spannovation Consulting Limited

The Open Topic Session is a forum for presenting recent technical information that could not be scheduled into other convention sessions.

• Flexural Behavior of Bamboo-Reinforced Sulfur Concrete Beams for Planetary Applications by Mitchell Thiel, Bradley University
• SHM for Damage Prediction Leveraging Kinematic Contact Enforcement-based Moving Load and Deep Learning Techniques by Suyun Ham
• Behavior of a Unbonded Post-Tensioned, Precast Concrete T-Wall under Lateral Loading by Sumedh Sharma, University of Alabama
• Algorithm for Predicting Development and Transfer Length of Prestressing Strand across Multiple Variationse by John Cabage, Southern Illinois Univ Edwardsville
• Non-Traditional Alumino-silicate Based Alkali-activated Mortars - Statistical Optimization of Solution Parameters and Processing Condition for Optimal Strength and Setting Time by Roshan Muththa Arachchige, Clarkson University
• A Comparative Study of Chemical and Physical Accelerators on Early Age Properties of Portland Cementitious Systems by Abdul Peerzada, Clemson University

Awarded authors of papers published in 2021 will present winning papers. Awarded categories include: the ACI Concrete International Award, the Mete A. Sozen Award for Excellence in Structural Research, and the Wason Medal for Most Meritorious Paper.

• Wason Medal for Most Meritorious: Limestone Calcined Clay Cements (LC³) by Karen Scrivener, Ecole Polytechnique Federale De Lausanne

This session will feature presentations of original, unpublished results from ongoing research projects and leading-edge concrete technology and research throughout the world.

• 3D Printing with Concrete: Development of a Vibrating Nozzle for Material Extrusion by Karthik Pattaje Sooryanarayana, University of Illinois At Urbana Champaign
• Shear Behavior of Macro-Synthetic Fiber-Reinforced Concrete by John Paul Gaston, University of Washington Seattle
• Alkali-Silica Reactivity of Belitic Calcium Sulfoaluminate (BCSA) Cement Concrete by Tayyab Adnan, Clarkson University
• Highly Dispersed CNT Reinforced Metakaolin-Cement Mortars with Enhanced Load-Bearing Capacity and Energy Absorption Capability by Rohitashva Singh, University of Texas Arlington
• Characterizing the Effect of Admixture Types on the Durability Properties of High Early-Strength Concrete by Ragini Krishna Nikumbh, Kansas State University
• Seismic Fragility Analysis of Nuclear Reactor Concrete Containment Considering Alkali-Silica Reaction by Chanyoung Kim, Ulsan National Institute of Science and Technology
• Noncontact Lap Splices of Large Hooked Reinforcing Bars by Zachary Coleman, Virginia Polytechnic Institute and State University
• Rehabilitation of PT Concrete Bridge Cantilever Wing Slabs using PT CFRP Rods by Faraj Shahrstan, Dalhousie University
• Service Life Prediction of Concrete Against Microbial Induced Corrosion by Feyza Nur Sahan, Oregon State University
• Use of High-Alkali Natural Pozzolans (NPs) and Reclaimed Fly Ashes (RFAs) as Alternative Supplementary Cementitious Materials (SCMs) in Concrete by Weiqi Wang, Clemson University
• Evaluation of Chemical Screening Tool (CST) to Predict Optimum Natural Pozzolans Dosage for ASR Mitigation in Concrete by Pravin Saraswatula, Texas A&M Transportation Institute, TTI
• Analysis of Micro Mechanical Properties of Geopolymer Gel Using Machine Learning Technique by Roshan Arachchige, Clarkson University
• Investigation of Relaxation Behaviour of Irradiated Cement Paste Using Statistical Nanoindentation by Poornima Patil, Kansas State University
• Development of FRP Retrofit Guidelines for Deficient Reinforced Concrete Horizontal Lateral Force Resisting Systems by Hunter Hutton, Virginia Polytechnic Institute & State University

Mechanical properties and cracking resistance are important in concrete structural design, and they affect the long-term performance of structural component. For example, additional strain caused by shrinkage would increase stress; however, higher creep may lead to relaxation and can reduce stress. Higher deformations can lead to higher stresses that could influence deflection, camber, and prestress loss in prestressed concrete elements and affect cracking potential in cast-in-place applications. Comparing with conventional vibrated concrete (CVC), self-consolidating concrete (SCC) generally requires increased amounts of cementitious and fine materials, or a larger volume of paste, and increased dosages of admixtures to achieve high workability and stability. SCC also has smaller maximum size of aggregate and reduced amount of coarse aggregate. These features could affect the strength, shrinkage, and creep behavior of SCC. This session will summarize recent work on the creep and shrinkage behavior of SCC as well as their effects on the mechanical properties and performance in precast and cast-in-place applications.

• Shrinkage and Creep of SCC used for Precast, Prestressed Applications by Kamal Khayat, Missouri S&T
• Evaluating Prediction Models of Creep and Drying Shrinkage of Self-Consolidating Concrete Containing Supplementary Cementitious Materials/Fillers by George Morcous, University of Nebraska Lincoln
• Development of Shrinkage and Creep Prediction Model for SCC (B4-TW-SCC) by Cloud-Based Analysis Database and Implementation in Bridge Design Software by Wen-Cheng Liao, National Taiwan University
• Creep Behavior of Self-Consolidating Concrete Reinforced with Hybrid Fibers by Hani Nassif, Rutgers University

Recently, many researchers have revealed that addition of nanoparticles can provide synergy to improve physical and chemical properties of concrete materials. Nanoparticles can act like fillers to refine pore structure and immobilize water movement in cement paste. They can function like seeds for CSH nucleation to accelerate cement hydration, thus compensating the delayed hydration and strength development caused by commonly used supplementary cementitious materials (SCMs) like fly ash in concrete. Many nanoparticles can also interact with SCMs to produce stable and/or cementing reaction products, thus further enhancing concrete strength and durability. The objectives of this technical session are to summarize the recent progress on the use of nanoparticles in cement-based materials containing SCMs, to have a better understanding of the synergic effects of nanoparticles and SCMs, and to recognize challenges in the use of nanoparticles in cement-based materials.

• Ultra-Piezoresistive Cement Mortars with CNTs and Fly Ash Admixtures for Structural Health Monitoring by Mimi Zhan, The Hong Kong University of Science and Technology
• The Effect of Nano-Additives on the Hydration Behavior and Durability of Concrete Containing Fly Ash by Jan Olek, Purdue University
• Effect and Mechanisms of Carbon Nanotube on the Early Age Hydration Performance of Cement-Based Materials by Zhen Li, Harbin Engineering University
• Newly Synthesized Nanotube Hybrids for Sustainable and Multifunctional Coal Ash Based Concrete by Myrsini Maglogianni, University of Texas At Arlington
• The Effects of Nanoclays, CNTs and Their Combination on the Fresh and Hardened Properties of Systems Incorporating Fly Ash and Slag by Shiho Kawashima, Columbia University

Fly ash and slag supplies are running out. In order to ensure sustainable and durable concrete, we must use novel supplementary cementitious materials in concrete. Arguably the most important property of supplementary cementitious materials that governs their use is their reactivity. This session covers all aspects of supplementary cementitious materials reactivity - from fundamental modeling studies, to reactivity test methods, to links between reactivity and durability, to thoughts on changes in specifications. The session is aimed at students, researchers, and the industry, who will learn fundamental and applied science and engineering of supplementary cementitious materials reactivity.

• Pore Solution Based Rapid and Innovative Approach to Determine Fly Ash and Natural Pozzolan Dosages for ASR Mitigation by Anol Mukhopadhyay, Texas A&M Transportation Institute
• Characterization and Quantification of the Pozzolanic Reactivity of Natural and Non-Conventional Pozzolans by Farshad Rajabipour, Penn State College of Engineering
• What’s Happening in the R³ test? by Lisa Burris, The Ohio State University

Over the last decades novelties have been shared in material design, mixing technology, material characterization and application, structural performance and design. While more innovations and novelties have been shared and exciting application examples are being presented, more knowledge gaps, research needs and questions have been raised. This session will invite national and international research groups, material suppliers and contractors to share new insights in UHPC technology, structural design and applications.

• Low Shrinkage UHPC - The Why, How, and Where? by Vic Perry, ceEntek North America
• Multi-Objective Density Diagrams Developed with Machine Learning Models to Optimize Sustainability and Cost-Efficiency of UHPC Mix Design by Cesario Tavares, Texas A&M University - College Station
• New Insights into the Sustainability of Ultra High-Performance Concrete (UHPC) and its Eco-Profile Improvement Through the Use of Recycled Aggregates (R-UHPC) by Davide di Summa, Politecnico Milano
• UHPC Creep and Shrinkage: Test Data and Predictive Models by Alireza Mohebbi, Genex Systems
• Experimental Investigation of Shear Behavior of Ultra-High Performance Concrete Considering Axial Load Effects by Abdulrahman Salah, University of Houston
• Shear Behavior of UHPC by Amr Soliman, SUNY University of Buffalo
• Softened Membrane Model for Ultra-High Performance Concrete by Noran Shahin, University of Houston Central
• Material Based Dynamic Increase Factor Models for UHP-FRC Under Compression and Tension by Kay Wille, University of Connecticut
• Seismic Behavior of Structural Systems with Highly Ductile Concrete Materials by Matthew James Bandelt, New Jersey Institute of Technology
• Pumping and Spraying Ultra-High Performance Concrete (UHPC) by Michael D. McDonagh, Steelike
• Under Construction Update: Phase 1 - Delaware Memorial Bridge Deck Rehabilitation by Gill Brindley, UHPC Solutions North America
• Innovative UHPC Placement Techniques by Michael D McDonagh, Steelike
• Restoration of Post-Tensioned Box-Girder Bridge Decks Using UHPC by Sri Sritharan, Iowa State University, Facca Incorporated

Alkali-activated concrete (AAC) is a class of clinkerless binders made by activating aluminosilicates (e.g., fly ash or slag) with alkaline solutions. Alkali-activation is not a recent innovation—its first mention in scientific literature dates back to more than a hundred years ago. Over the past two decades however, researchers have focused intently on advancing AAC as an alternative to portland cement concrete. Despite widespread academic interest, the concrete industry has yet to adopt AAC into practice. Some experts question the sustainability of AAC; some challenge its long-term durability; others claim the materials and technology do not scale. This forum will discuss the practice-readiness of AAC, highlighting its perceived benefits and the obstacles that hinder its potential widespread acceptance.

• Should Alkali-activated Materials Compete with Portland Cement? by John Provis, The University of Sheffield
• Do Alkali Activated Materials have a Potential to Significantly Reduce Global CO₂ by Karen Scrivener, Ecole Polytechnique Fdrale De Lausanne

These sessions will be co-sponsored by RILEM Technical Committee 276-Digital fabrication with Cement-based Materials. Additionally, they will include presentations by U.S and international teams involved in 3DConcrete, an NSF AccelNet Program to enhance global network-to-network collaborations on concrete 3D printing. These sessions will highlight the importance of controlling fresh-state properties for the successful execution of 3D concrete printing (3DCP). 3DCP is a new method of casting that can introduce a number of advantages but there are also significant challenges, especially in controlling the viscoelastic properties of the concrete in the fresh state. Academic and industry researchers and practitioners interested in 3DCP should attend this session. Attendees will learn: i) the current state-of-the-art of 3DCP; ii) how rheology directly impacts printing performance; iii) strategies to effectively control workability for 3DCP; and iv) key challenges in bringing 3DCP to practice.

• Buildability, Rheological Properties, and Early-age Deformations of 3D-Printed Cement-based Materials by Mohamadreza Moini, Princeton University
• Dispersed Nano- and Micro-sized Portlandite Particulates via Electrosteric Exclusion at Short Screening Lengths by Iman Mehdipour, University of California, Los Angeles
• Enabling 3DCP Through the Use of Ternary-Blended Binder and In-line Mixing Nozzle by Wilson Ricardo Leal Da Silva, Danish Technological Institute

These sessions will be co-sponsored by RILEM Technical Committee 276-Digital fabrication with Cement-based Materials. Additionally, they will include presentations by U.S and international teams involved in 3DConcrete, an NSF AccelNet Program to enhance global network-to-network collaborations on concrete 3D printing. These sessions will highlight the importance of controlling fresh-state properties for the successful execution of 3D concrete printing (3DCP). 3DCP is a new method of casting that can introduce a number of advantages but there are also significant challenges, especially in controlling the viscoelastic properties of the concrete in the fresh state. Academic and industry researchers and practitioners interested in 3DCP should attend this session. Attendees will learn: i) the current state-of-the-art of 3DCP; ii) how rheology directly impacts printing performance; iii) strategies to effectively control workability for 3DCP; and iv) key challenges in bringing 3DCP to practice.

• 3-D-Concrete-Printing by Layered Extrusion – Requirements for Fresh Concrete and Testing by Viktor Mechtcherine, TU Dresden
• Controlling Rheology of 3D Printable Concrete Through Vibration by Karthik Pattaje Sooryanarayana, University of Illinois Urbana-Champaign
• Material Tailoring in The Extruder, Controlling Hydration, and Rheology by Lex Reiter, ETH Zürich
• Exploring the Influence of Material Characteristics and Extruder Geometry on 3-D Printing of Cementitious Binders by Sooraj Nair, Arizona State University
• Printability Metrics for Additive Manufacturing of Cement-based Materials by Joseph Biernacki, Tennessee Technological University

The Nubian Vault's mudbrick process has advantages for economic and educational growth in the building industry for local communities. As the revival of the Nubian Vault construct has taken hold in Sub-Saharan Africa, the rainy season continues to halt progress in Africa's more tropical regions. With assistance from Dwell Earth, a company founded by two brothers in Texas, and the measured use of concrete, the Nubian Vault's failures have the potential for success in the tropics. My presentation will look at the history of the Nubian Vault from ancient Egypt to Hassan Fathy's twentieth-century revival and the recent work of the French /Burkinabé NGO La Voûte Nubienne. Lastly, I will show the failed experiments and the subsequent potential for success.

• Rethink the Nubian vault in Sub-Saharian Africa by Coleman A. Jordan, Morgan State University's School of Architecture and Planning

This session will provide insight into the design and construction process of The REACH project (winner of the 2020 ACI Excellence Award) with a behind the scenes virtual “tour” of the project and insight into specifying concrete mix designs.

• Meeting Design Goals with Architectural Concrete by Larry Rowland, Lehigh White Cement Company, Cementir Holding N.V.

Learn how the architects, structural engineer, and formwork designers worked together to achieve the overall vision of The REACH.

• The Reach by Jeffrey Beane, Silman Associates
• The Reach – Design in Detail by Sarah Murphy, BNIM
• The Reach at Kennedy Center by Steve Karasik, PERI Formwork Systems, Inc.

This session features presentations associated with 11 collaborative papers written by groups of faculties who use some of the most innovative approaches to teach topics in concrete materials and reinforced concrete design at the undergraduate level. The session will include presentations related to general pedagogy, along with teaching hydration of cement, fresh and hardened properties of concrete, durability, additive manufacturing, nondestructive testing, detailing, the equivalent rectangular stress block, failure types of reinforced concrete beams, nonrectangular beams, and analysis and design for shear. The session will also include a presentation by the Walter P. Moore Award Winner.

• Effective Teaching Methods in Concrete Education by Matthew Swenty. Virginia Military Institute
• Pedagogical Approaches to Teaching Cement Hydration Processes to Undergraduate Students by Lisa Burris, Ohio State University
• Best Practices and Lessons Learned: Nondestructive Testing by Armen Amirkhanian, University of Alabama
• Innovative Pedagogical Approaches for Concrete Durability by Heather Kirkvold, James Madison University
• Pedagogical Approaches for Additive Manufacturing with Cementitious Materials by Jacob Henschen, University of Illinois Urbana-Champaign
• Teaching Concrete Through Context by Anahid Behrouzi, California Polytechnic State University
• Pedagogical Techniques Used to Teach Detailing of Reinforced Concrete Structures by Kacie D'Alessandro, Virginia Military Institute
• Understanding the Equivalent Rectangular Stress Block by Chris Carroll, Saint Louis University
• Teaching Flexural Strength (Failure Modes) in Reinforced Concrete by Royce Floyd, The University of Oklahoma
• Visualizing Non-rectangular Beams by Chris Carroll, Saint Louis University
• Approaches for Teaching Shear Analysis and Design of Reinforced Concrete by Royce Floyd, The University of Oklahoma

The synopsis of this session is to educate researchers, practitioners, students, and officials on the merit of using AI in the concrete industry. Special attention will be paid to better the performance of concrete materials at ambient and elevated temperatures and showcase the substantial potential of using AI to improve design of concrete structures under traditional and fire conditions. Introduce AI and automation to the concrete industry.

• Machine Learning Applications in Structural Engineering: Hope, Hype or Hindrance? by Henry Burton, University of California, Los Angeles (UCLA)
• The Use of Machine Learning Algorithms and IoT Sensor Data for Concrete Performance Testing and Analysis by Andrew Fahim, Giatec Scientific Inc.
• Damage Detection in Concrete Bridge T Girders Using 3-D Finite Element Simulations Trained by Artificial Neural Network by Hayder Rasheed, Kansas State University
• The Power of Statistical Learning Applied to the Proportioning of Fiber-Reinforced Concrete by Emilio Garcia Taengua, University of Leeds
• Self-healing Capacity of Cementitious Materials Based on Data Mining Strategies by Liberato Ferrara, Polytechnic University of Milan
• Autonomous Evaluation of Fire-damaged Concrete Structures by M. Z. Naser, Clemson

This session honors the many contributions made by Dr. Shiraz Tayabji to the American Concrete Institute and to the concrete pavement community as a whole. Dr. Tayabji is a long-time member of ACI, a Fellow, and a former chair of ACI 325, Concrete Pavements. To highlight the range of technical areas that Dr. Tayabji has contributed to throughout his distinguished career, this session includes presentations by prominent concrete pavement researchers and practitioners on important concrete materials, design, rehabilitation, and performance topics. The information presented in this session will be of interest to concrete materials engineers, pavement designers, and construction personnel.

• 40 Years of Concrete Pavement Innovations by Shiraz Tayabji, Advanced Concrete Pavement Consultancy LLC
• Theory Versus Reality in Concrete Airfield Pavement Engineering by Raymond Rollings, Rollings Consulting, LLC
• Continuously Reinforced Concrete Pavements by Dan Zollinger, Texas A&M Transportation Institute
• Concrete Strength Variability and Mix Design for Large Concrete Paving Projects by W. Charles Greer, Jr
• Durability of Concrete Pavement Materials by Peter Taylor, National Concrete Pavement Technology Center
• Precast Concrete Pavements by Mark B. Snyder, Pavement Engineering and Research Consultants, LLC
• Concrete Overlays by Julie Vandenbossche, University of Pittsburgh
• Recent Innovations for CRCP by Jeffery Roesler, University of Illinois at Urbana-Champaign

Constructability analysis of the structural systems is a key step in optimizing time, quality, and economic considerations of a project. Shotcrete construction practices and techniques are used to an advantage on multi story projects. This session looks to case studies, best practices, and material sciences for strategies to best achieve a building structure that meets the demanding requirements of the industry.

• Constructability of Mass Shotcrete by Stacia Van Zetten, Exact Technology
• Constructability of Zero Lot Lines Foundations with Shotcrete by Charles Hanskat, American Shotcrete Association
• Constructability of Top – Down Construction Methods by Eamonn Connolly, James McHugh Construction Co.
• Architectural Shotcrete – Creative, Sustainable and Durable Concrete Structures Using Shotcrete by Charles Hanskat, American Shotcrete Association
• Constructability Reviews are Subjective Depending on Your Perception by James Cornell, JN Cornell Associates, LLC

Soil structure interaction (SSI) effects are studied through instrumented bridges in the field and extensive dynamic analyses. Studies show that foundation compliance owing to SSI attenuates seismic demands in monolithic bridge piers but may accentuate seating demands for bearing supports in bridges that are not continuous with the piers. This session aims to assess the design implications of SSI in controlling the pier/bearing demands as a retrofit measure in existing bridges, as well as to establish a framework for its explicit consideration in new seismic design of bridges, particularly in seismic events of large intensity.

• A Framework for Development of Soil and Foundation Model for Seismic SSI Analysis of Bridges by Mohamed Sayed, University of Toronto
• Seismic Performance Assessment of Multi-Span Continuous Concrete Girder Highway Bridges in British Columbia Considering Soil-Structure Interaction by Muntashir Billah, Lakehead University
• How the Choice of Various SSI Models Influences the Seismic Response of Medium-Span Bridges by Nathalie Roy, University of Sherbrooke
• Moderating Influence of SSI on Drift Demands in Piers of Older Bridges by Stavroula Pantazopoulou, York University
• Behavior of a Bridge Pile Foundation under Combined Vertical and Lateral Loads by Sri Sritharan, Iowa State University

The session will discuss the use of multiple nondestructive testing (NDT) methods for assessing the conditions of aging concrete bridges and how data fusion can be used to combine and “image” both visible surface conditions and unseen internal conditions. Thus it is anticipated that speakers will cover the use of a wide range of NDT methods for bridge decks, superstructure and substructure condition assessment and their fusion with one or more additional methods including: computer-based photographic mapping of cracking/spalling damage; infrared thermography; ground penetrating radar; acoustic/impact echo/surface waves scanning of decks; and, corrosion activity mapping with half-cell potential, resistivity and polarization methods.

• Multi-Technology Approach to Bridge NDE by Shane D Boone, Bridge Diagnostics, Inc.
• Multi-sensor Data Collection and Fusion Using Deep Autoencoders in Condition Evaluation of Concrete Bridge Decks by Jinying Zhu, Lakehead University
• Diagnostic Imaging of Concrete Using Fusion of GPR and Ultrasonic Array Images by Thomas Schumacher, Portland State University

High rise construction, specifically in Chicago, is continuing to push the limits of what is possible with concrete. Buildings are going up higher and developers are requesting more livable square footage, requiring concrete with very strict requirements and specifications. This results in a chain of preparation once a building is announced from the mix design development and raw material sourcing, to the testing of the mix design meeting specification, to the contractor who will do the placement and construction. Individuals in each stage of the process must work together to ensure a successful project. Collaboration and information exchange between designers, architects, contractors, producers, and testing labs needs to be streamlined and improved to ensure that the structural properties of the material can be matched with constructability. Testing labs should be more involved with the design and certification of mix designs to ensure that the specification is being adhered to, while contractors need to take the concrete and place it in the building. As such, it needs to be pumpable and workable once it comes out of the pump 60+ stories in the air, which adds an additional constraint placed upon all who are involved. Designers require more specific properties of materials, which results in substantial challenges in finding the appropriate materials and mix designs.

• What Are We Going to Pump That With? by Eamonn Connolly, James McHugh Construction Co.
• This Isn’t Pumping Well – Do We Really Need More Super? by Walter Flood, Flood Testing Labs
• Consistency Via In-transit Concrete Management Aiding Contractors in Reducing Jobsite Delays by Brett Harris, GCP Applied Technologies
• Pumping Concrete for Trump, Aqua and The Coast Towers in Chicago by Jake Gibbons
• Overview of Research on Reducing Pumping Pressure for High-strength SCC by Dimitri Feys, Missouri S&T

Mixtures designated as self-consolidating concrete (SCC) may need a certain amount of consolidation to eliminate surface blemishes, to flow through congested areas, and to meet slump flow loss during construction. Care must be exercised in consolidating highly flowable mixtures such as semi SCC and SCC because they can lose stability. This session will address the consolidation needs of semi SCC and SCC and the effects of type and duration of vibration on the stability of these mixtures. There will be case studies and lessons learned. Researchers, engineers, contractors, and practitioners will benefit from the experience of the presenters.

• The Impact of Rheology on Self-Consolidation by Joseph Daczko, Corporation
• Testing and Consolidation of Test Samples for SWC and FR-SWC by Kamal Khayat, Missouri University of Science and Technology
• Consolidation of Self-Consolidating Concrete in Precast/Prestress? by G Terry Harris, GCP Applied Technologies

Fly ash has been the most widely used SCM in concrete for decades. For this reason, significant changes in its production and quality during the last 10 years, have driven a growing interest in harvesting fly ash from impoundments or landfills for use in concrete. Processed coal bottom ash and other CCPs that are currently not used in concrete have also been identified as an emerging supplementary cementitious materials that can help meet the demand for materials that can impart fly ash-like benefits to concrete. This session will provide the opportunity to learn about the characteristics and performance of new and emerging coal combustion products for use in concrete. Students, academics, concrete producers, contractors, specifiers and material suppliers will benefit from the information presented in this session.

• Pozzolanic Properties of Ground Coal Bottom Ash by Michael Thomas, University of New Brunswick
• An Improved Strength Activity Index Test by Prannoy Suraneni, University of Miami
• A New Performance-based Mixture Proportioning Approach for Concrete Containing Coal Combustion Products by Keshav Bharadwaj Ravi, Oregon State University
• Performance Based Prediction of Reclaimed and Conventional Fly Ash with Bulk Oxide Analysis by Tyler Ley, Oklahoma State University
• Performance Evaluation and Beneficiation of High Sulfur and High Alkali Off-spec Fly Ashes by Gopakumar Kaladharan, Pennsylvania State University

Fly ash has been the most widely used SCM in concrete for decades. For this reason, significant changes in its production and quality during the last 10 years, have driven a growing interest in harvesting fly ash from impoundments or landfills for use in concrete. Processed coal bottom ash and other CCPs that are currently not used in concrete have also been identified as an emerging supplementary cementitious materials that can help meet the demand for materials that can impart fly ash-like benefits to concrete. This session will provide the opportunity to learn about the characteristics and performance of new and emerging coal combustion products for use in concrete. Students, academics, concrete producers, contractors, specifiers and material suppliers will benefit from the information presented in this session.

• Fly Ash Supply: Current Statistics and Forecasted Supply by Thomas H Adams, American Coal Ash Association
• Bottom Ash for Use as a Pozzolan in Concrete by Cole Spencer, Boral Resources
• Durability Testing of Marginal and Unconventional Fly Ash by Christopher Shearer, South Dakota School of Mines Tech
• Use of Spray Dryer Absorber Material as a Partial Replacement for Portland Cement in Concrete by Robert Jewell, Univ of KY Center for Applied Energy Research
• Reclaimed Coal Ash as a Supplementary Cementitious Material: Productive Reuse including Chemi-mechanical Beneficiation by Daniel Benkeser, Georgia Institute of Technology

This session intends to present case studies or projects where innovative techniques were used to assess the condition of concrete structures and plan rehabilitation strategies. The techniques include nondestructive testing, corrosion measurements, modeling, and monitoring. The session is meant for engineers and practitioners.

• A Novel "Coupled" Approach to Evaluate and Extend the Service Life of an Existing Structure  by Jacques Marchand, SIMCO Technologies Inc.
• Trial Implementation of Impressed Current Cathodic Protection as Part of a Structure Rehabilitation Strategy by Eyad Alhariri, Structural Technologies
• Structural Condition Assessment of Environmental Concrete Structures before Rehabilitation by Pericles Stivaros, GEI Consultants, Inc
• Longfellow Tower – 16+ Years Later by Timothy Gillespie, Sika Corporation
• Development of 3rd Generation Corrosion Inhibiting Admixture for Large Repair/Greenfield Projects by Surendra Manjrekar, Sunanda Speciality Coatings Pvt. Ltd.

This session will bring together four individuals with extensive experience in litigation related to concrete construction. The speakers will share their experiences as lawyers, expert witnesses, and engineers through case studies and will share their experience-based recommendations.

• A Case Study: Documentation Pitfalls Can Put You in The Hole by William Rushing, Waldemar S Nelson
• When Bad Things Happen to Good Buildings by Randall Poston, Pivot Engineers
• Panel Discussion of Legal Issues in Concrete Construction – Lessons Learned by Panel Members

Corrosion of concrete in sewer infrastructures is a worldwide concern. Although the mechanism of this corrosion was discovered in the middle of last century, it was not a universal concern until the late 1990s. Since then, research has confirmed that the cause of this corrosion is a biogenic acid attack. Solutions for mitigation and testing processes for assurance have been developed. This session is for anyone interested in knowing exactly what causes sewer corrosion and what methods of mitigation are available.

• Microbially Induced Corrosion: Mechanisms and a Discussion of Standardized Testing Uses and Limitations by W Jason Weiss, Oregon State University
• Benchtop Biogenic Testing of Microbially Induced Corrosion of Concrete by O. Burkan Isgor, Oregon State University
• The Use of Acid-Resistant Alkali-Activated Cement (AAC) Concrete by Wil Srubar, University of Colorado Boulder
• The Use of Alternative Cements to Protect Concrete in an MICC Environment by James Aldred, Concrete Future Pty Ltd.
• Improving the MIC Resistance in Dry Cast Concrete Pipe Using Nanoplatelets by Amirpasha Peyvandi, Jacobs
• The Efficacy of Antimicrobial and Colloidal Silica Additives to Mitigate MICC by Samuel Lines, Concrete Sealants, Inc.

Early-age performance of slag cement with Type IL cement has been found to be equal to or better than with Portland cement from the same source. The alumina in the slag cement can react with more of the finely divided limestone to form additional carboaluminate hydrates that then results in reduced porosity and increased early-age strength. There is also reduced permeability, as indicated by ASTM C1202 test results. While some early published papers indicated a potential concern for an increased risk of low-temperature thaumasite sulfate attack, our extensive long-term tests on concretes have shown that Type IL cement- slag cement combinations are as resistant to sulfate attack as Type I cement-slag cement combinations and more resistant than equivalent w/cm concretes made with Type V cements to both the ettringite and thaumasite forms of degradation. This course will include discussion on these two topics and will also look at some recent projects with these materials. Speakers will walk through different reaction rates such as resistivity and diffusion with portland limestone cements, strength results and modeling.

• Performance of Slag Cement with Portland‐limestone Cement in Concrete by R Doug Hooton, University of Toronto
• Slag and Portland Limestone Cement: A Symbiotic Relationship by W Jason Weiss, Oregon State University

The synopsis of this session is to educate researchers, practitioners, students, and officials on the merit of This session will feature presentations of original, unpublished results from ongoing research projects and leading-edge concrete technology and research throughout the world.

• Anchorage of Large High-Strength Headed Reinforcing Bars by Ali Banaeipour, University of Kansas
• Reducing Drying Shrinkage and Micro-Cracking in Concrete using Superabsorbent Cellulose by Afraa Hassan, Lakehead University

The fabrication of novel reinforced concrete structures using digital technologies requires the definition of suitable strategies for reinforcement implementation. Reinforcement integration must be compatible with either the shape or the specific printing technique adopted for each structural element production. This session aims to provide the latest updates on opportunities and techniques using “reinforced concrete” for engineers, architects, and researchers actively involved in or simply interested in three-dimensional (3-D) printing with cementitious composites. These techniques have been developed to further expand the outreach of digitally fabricated concrete materials and structures.

• Flexural Performance of Dually Reinforced 3-D Concrete Printed Beams by Marchant van den Heever, Stellenbosch University
• Fiber Reinforcement for 3-D Printed Cementitious Systems by Sooraj Nair, Arizona State University
• An Experimental Set-up to Assess the Early Age Mechanical Performance of Fiber Reinforced Mortars Used in 3-DCP by Liberato Ferrara, Polytechnic University of Milan
• Reinforcing 3-D Printed Concrete Structures by Steel Nails - A Feasibility Study by Arnaud Perrot, Universite De Bretagne Sud
• Interlayer Reinforcement for Digitally Fabricated Concrete Structures by Jaime Mata-Falcon, ETH Zurich
• External Reinforcing System for 3-D Printed Concrete Elements: Technology and Design Approach by Costantino Menna, University of Naples Federico II
• Integrating Reinforcement in Digital Fabrication with Concrete by Viktor Mechtcherine, TU Dresden II
• Reinforcement of Layer-Extrusion 3-D Concrete Printing by Freek Bos, TU Eindhoven

Nanotechnology has the potential to revolutionize the properties of concrete. Conversation in this session is designed to explore the impact of nanomodification on creating concretes with new functionalities, such as sensing and damage detection, self healing, energy harvesting, deicing applications, and so on. This session provides a unique opportunity for engineers, scientists, and industry leaders to learn and experience new concepts and novel research areas on the use of nanotechnology in cementitious materials and concrete.

• Self Deicing and Strain Sensing Functionalities of Smart Concrete: Advanced Electrothermic Efficiency and Electromechanical Impedance Sensitivity by Maria Konsta, University of Texas at Arlington
• Role of Nanosilica in Preparing Functionalized Concrete through Surface Treatment by Pengkun Hou, University of Jinan
• Smart Acoustic Cement Sensors Incorporating Carbon Nanotubes by Shreya Vemuganti, University of New Mexico
• Machine Learning Based Concrete Property Monitoring Through Nano-Sensors by Yenfang Su, Purdue University

Ultra-high-performance concrete (UHPC) is seen as one of the most influential material innovations in the construction industry in the twenty-first century. Many research groups in academia or industry worldwide have developed UHPC mixtures, investigated their material properties and their structural behavior and thus have contributed to the increased interest in this type of material. While design guidelines are being drafted or have already been published the application of UHPC has been surpassed the stage of pilot projects in some areas. It seems that UHPC finds more and more ways into the construction industry beyond the “killer application” which was sought in the early days. This session will invite national and international research groups, material suppliers and contractors to share their knowledge in innovations in practical applications.

• Innovative Precast Design Concept for Basins and Tanks Using Ultra High-Performance Fiber Reinforced Concrete with Enhanced Durability  by Liberato Ferrara, Polytechnic University of Milan
• Confining Concrete Column with Eco-friendly UHPC by Alessandro Fantilli, Polytechnic University of Turin
• Applications of UHPC Vertical & Horizontal Panels by Vic Perry, ceEntek North America
• A Reinforced Concrete Bridge Pier Strengthened with HPFRC Jacketing by Giovanni Plizzari, University of Brescia
• Carbon Fiber Reinforced Concrete for Bus-pads by Rishi Gupta, University of Victoria

Ultra-high-performance concrete (UHPC) is attracting increasing interests worldwide due to its superior mechanical properties and excellent durability. However, the difficulties in handling of UHPC has been increasingly recognized as a major problem during construction because of a significant workability reduction due to very low water-binder ratio (w/b) and very high dosages of fine powders (for example, silica fume) and admixtures (for example, water-reducing admixtures) used. It is well understood that mixing methods and procedures have more substantial effects on workability of UHPC than on those of conventional concrete. Ultra high performance could not be achieved if required workability of UHPC is not met. The main objective of this technical session is to uphold a platform to discuss the issues, challenges, and recent advances in characterizing, controlling, and improving workability of UHPC. It is also to promote broader dialogue and greater interactions between UHPC researchers and users.

• Rheological Properties of UHPC  by Weina Meng, Stevens Institute of Technology
• Correlation Between “Very Early” Age Fracture Performance and Evolution of Rheological Properties of High Performance Fiber Reinforced Cementitious Composites with Adapted Rheology by Liberato Ferrara, Polytechnic University of Milan
• Understanding the Workability of UHPC Mixture Designs by Marllon Cook, Oklahoma State University
• Using Resonant Acoustic Mixing to Improve UHPC Workability by Aileen Vandenberg, Technische Universitat Braunschweig and Kay Wille, University of Connecticut
• Particle-Scale Mechanisms and Rheological Response of UHPC by Narayanan Neithalath, Arizona State University
• Impact of Chemical Admixtures on Time-Dependent Workability, and Rheological Properties of UHPC by Jiong Hu, University of Nebraska-Lincolny

This session will provide background on the creation of the new ACI 318 PLUS subscription along with guidance on how educators can navigate some of its key features and leverage it as a tool to improve students’ understanding of reinforced concrete design. Discussion will be included to allow for brainstorming ideas on how this platform could better enhance teaching ACI CODE-318-19. Speakers include Michael L. Tholen, Ph.D., P.E and Trey Hamilton Ph.D., professor emeritus at the University of Florida.

• Using ACI 318 PLUS as a Teaching Tool  by Michael Tholen and Trey Hamiliton, American Concrete Institute

This session focuses on the preservation and adaptive reuse as alternatives to the replacement of built structures in the pursuit of sustainable built environment

• Breaking Ground on the Roof by John Hutton, Uzun + Case
• The 4th Dimension: Life Cycle Assessment of Critical Structures by Daniel Parker, Structural Integrity Associates
• Tessellated Concrete Structures: A Concept for Sustainability and Resilience by Grace Crocker, Clemson University

This session will honor Michael Thomas, PhD, PEng, FACI, FICT, for his extensive contributions to advancing cement and concrete research, and his service to the concrete industry. Various industry leaders will discuss the impacts of the research conducted by Dr. Thomas and his students in the areas of supplementary cementitious materials (SCMs), alkali-silica reaction (ASR) mechanisms, mitigation, and testing; sulfate resistance; chloride-induced corrosion; and other areas of concrete durability.

• Life-365: Stories and Choices About Development by Evan Bentz, University of Toronto
• Relating ASR Lab Tests to Outdoor Exposure Site Performance - More Research is Needed by Benoit Fournier, Laval University
• Understanding How Supplementary Cementitious Materials Suppress ASR by Karen Scrivener, Ecole Polytechnique Fdrale De Lausanne
• Contributions of M. D. A. Thomas to PCA Research by Michelle Wilson, Portland Cement Association
• Durability Performance of Concrete Exposed to Harsh Marine Environments by Ted Moffatt, WSP
• A Practical Guide to Life, Liberty, and the Pursuit of Concrete Durability (Sulfate Attack and DEF in Particular) by R Doug Hooton, University of Toronto
• Tales From the Road by Kevin Folliard, University of Texas At Austin
• Comments From Michael Thomas by Michael Thomas, University of New Brunswick

This session will provide state of the art discussion on the use of alternatives to Portland cement, with a focus on processes for upscaling the use of alternative cements (ACMs) and understanding beneficial applications in which ACMs can be used in lieu of Portland cement to create more durable, sustainable, and resilient concrete. The session targets both researchers working to advance understanding of ACMs and industry users (suppliers, producers, owners) interested in applying ACM technology to their work.

• Reinforced Concrete Made with Belitic Calcium Sulfoaluminate Cement by Cameron Murray, University of Arkansas
• OPC-CSAB Blends for Durable Rapid Repair Applications by Lisa Burris, Ohio State University
• Standardizing Corrosion Assessment Methods for Alternative Cementitious Systems by Gokul Dev Vasudevan, Oregon State University

Buildings alone account for 40% of the global greenhouse gas emissions. Two thirds of that total impact is from operational emissions while the remainder is from embodied emissions. Embodied emissions include all the emissions required to produce everything that goes into our buildings – the structure, enclosure and all the materials inside. Between now and 2050, half of the new construction emissions between now and then will be from embodied carbon. Therefore, the industry has begun to take action and groups like AIA 2030, Architecture 2030, SE2050, and USGBC have shifted their focus to include embodied carbon. In order to address this issue, we need to take steps to quantify and then reduce our impact. We can do this using a process called Whole Building Lifecycle Assessment (WBLCA). More and more project teams are using WBLCA as a design tool and are discussing decarbonizations strategies. As such, design professionals are actively and looking for low carbon material alternatives. Since cement is such a ubiquitous and carbon-intensive material, it is definitely at the center of these discussions. It’s important that the concrete industry be aware of what is being discussed in the market and how this will affect our industry in the future as this trend grows. This presentation will also look at examples of how this translates to the design documents, the specifications and ultimately the concrete mix designs.

• Embodied Carbon and the Concrete Industry: What you need to know by Kelly Roberts, Walter P. Moore Atlanta

Our over-arching theme is “The Evolution of Concrete” where we will discuss sustainability, labor trends, and admixture/reinforcement, design and how they overlap and impact each other.

• Optimized Pavement Design - TCP by Sherry Sullivan, FORTA Corporation
• Enhancing the Performance of Plain Concrete at Significant Cost Savings by Luke Pinkerton, Helix Steel
• An Introduction to Formliners by Layne Chastain, US Formliner
• The Transformational Power of Concrete Stain by Dan McBride, Nawkaw

This session will address both fundamentals of pozzolan activation through calcination, considering relatively pure and impure natural sources, and practical use of these materials in concrete construction. The intended audience includes engineers, contractors, researchers, and students interested in alternative sources of pozzolans. It will cover the fundamentals of pozzolan calcination, including effects of composition and processing, on structure and performance. The session will also address practical use of calcined pozzolans at an industrial scale.

• Tailoring Calcined Impure Clays for Improved Performance by Katelyn O'Quinn, University of Texas
• Activation of Na- and Ca- Bentonites: Comparison of Thermal and Mechanical Treatments by Alastair Marsh, University of Leeds
• Impact of Calcined Clay Particle Size on Mortar Performance by Anna Landreville, Imerys Performance Minerals
• Understanding the Role of Calcined Clay on Pore Structure and Transport Properties of Cement Composites by Yuvaraj Dhandapani, University of Leeds
• Monte-Carlo Based Thermodynamic Analysis on the Performance of Calcined Clays in Cementitious Systems by Keshav Bharadwaj Ravi, Oregon State University
• Pozzolanic Reactivity and Performance of Calcined Byproduct Clays of Various Kaolinite Contents in Concrete Mixtures by Khashayar Jafari, Pennsylvania State University
• Metakaolin in Concrete: The Role of Alumina by Michael Thomas, University of New Brunswick
• Industrial Experience with Production and Use of Calcined Clay-Limestone Cement by Jesper Damtoft, Cementir Holding
• Implementation of LC³ in the Field by Karen Scrivener, Ecole Polytechnique Fdrale De Lausanne
• Using Metakaolin for Enhancing Durability and Mitigating Alkali-Silica Reaction (ASR) in Concrete by Frank Ong, Master Builders Solutions US
• Predicting the Rheology of Limestone Calcined Clay Cement (LC³) by Ogulcan Canbek, Georgia Institute of Technology
• Physical Properties and Durability Performance of a Canadian Calcined Clay by R Doug Hooton, University of Toronto

Activities to achieve carbon neutrality in concrete construction are currently pervasive throughout the concrete industry. Industry associations and companies, along with various organizations outside our industry, are focusing their efforts and dedicating resources to achieve carbon neutrality in construction. A wide array of technologies are being deployed by the cement and concrete industry while other technologies are under development. This session will provide an overview of the carbon neutrality issue and will highlight strategies and technologies being implemented or being developed to achieve carbon neutrality.

• PCA’s Roadmap to Carbon Neutrality by Richard Bohan, PCA
• Low-Carbon Cement and Concrete Demand and Legislation by Nathan Forrest, California Nevada Cement Association
• Strategies for Reducing CO2 Emissions at Cement Plants by Kenneth Kazanis, LafargeHolcim
• Groundbreaking Technologies: Carbon Capture and Storage (CCS) by Ignacio Cariaga, Lehigh Hanson

Concrete 3-D printing has quickly become a hotbed of research and case studies for the field; yet the related computational models and analytical methods for simulating such techniques are still in their infancy. This session is targeted toward engineering mechanists, computational scientists, and those interested in the simulation of early age concrete behavior. Presentations will focus on state of the art 3-D printing modeling techniques, including analytical methods, as well discrete element, lattice discrete element, and finite element models.

• Numerical Simulation of Concrete 3D Printing by Elham Ramyar, Northwestern University
• Simulating Processing Steps of Extrusion Based 3-D Concrete Printing Using Various Numerical Approaches by Viktor Mechtcherine, TU Dresden
• Modeling the Rheological Response and Extrusion Printing of Cementitious Binders by Narayanan Neithalath, Arizona State University
• Rheo-Mechanics Modeling for Constructability Quantification of 3D Printed Concrete by Jacques Kruger, Stellenbosch University
• Computer Simulation of 3-D-Printed Polymer Concrete Tank by Mahmoud Reda Taha, University of New Mexico

This session is intended to introduce individuals to the historical aspects of concrete and concrete construction practices. Attendees will gain a greater understanding and appreciation of the development of the concrete industry.

• History of Tall Buildings in Latin America by Richard Yelton, World of Concrete
• A Look at One of the Earliest Concrete Pavement Overlays by Kurt Smith, Applied Pavement Technology, Inc.
• A Brief History of Aluminum and Concrete by Anne Werner, Southern Illinois University Edwardsville
• Why is the Splitting Tensile Strength Test Known as the “Brazilian Test”? by Jussara Tanesi, AET - American Engineering Testing
• The Middle Road Bridge (1909): Canada’s First Reinforced Concrete Arch-Truss Bridge by F Michael Bartlett, University of Western Ontario

Concrete is the world’s most widely used construction material. Yet, the production of portland cement, an essential constituent of concrete, leads to greenhouse gas emissions into the atmosphere. The production of 1 ton of portland cement clinker releases approximately one ton of CO2 and other greenhouse gases. Environmental considerations have been a major thrust for the sustainable development of the cement and concrete industries. A sustainable concrete structure is designed and built to have a positive environmental footprint during its entire life cycle. Concrete is increasingly being considered as a sustainable material owing to its low inherent energy requirements and little associated waste. Not only is it made from some of the most plentiful resources on Earth, it can also be made with numerous recycled materials and by-products and is itself entirely recyclable. Emerging breakthroughs in concrete technology have allowed producing ultra-high-performance concrete requiring less raw materials, along with structures that are much more durable to reduce maintenance, repair, and reconstruction.

• Long-Term Field Performance of Ready-Mix Recycled Aggregate Concrete by Humera Ahmed, The University of British Columbia
• Experimental Analysis of Cement Mortar with Varying Replacement Levels of Crumb Rubber by Rubaiya Rumman, The University of British Columbia
• Mechanical Properties of Rubberized Recycled Aggregate Concrete by Kishoare Tamanna, The University of British Columbia
• Effect of Shear Span-to-Depth Ratio on the Behavior of RAC Beams by Nariman Khalil, University of Balamand
• Leaching Composition and Associated Microbial Community of Recycled Concrete Aggregates by Matthew P Adams, New Jersey Institute of Technology
• Impact of Recycled Concrete Aggregate Parent Concrete Strength on Mechanical Properties of Recycled Aggregate Concrete by Noah Thibodeaux, New Jersey Institute of Technology
• Evaluating Mechanical and Durability Performance of Recycled Plastic-Rubber Compound Modified Mortars with/without Tire Steel Fiber-Reinforcement by Qingli Dai, Michigan Technological University
• HPFRC Made with Recycled Steel Fibers from End-of-Life Tires by Alessandro Fantilli, Polytechnic University of Turin
• Long-Term Performance Evaluation of Concrete Pavements Containing Recycled Concrete Aggregate in Oklahoma by Xijun Shi, Texas State University

ACI 376-11/376M-11 Code Requirements for Design and Construction of Concrete Structures for the Containment of Refrigerated Liquefied Gases and Commentary was adopted by ACI in November 2011 and published in August 2013. The committee had been formed in 2003 at the request of the national Fire Prevention Association (NFPA) Technical Committee 59A on liquefied natural gas (LNG) for the purpose developing a code document that could referenced by NFPA 59A for design and construction of concrete containment structures. The scope of the Code includes not just LNG, but all refrigerated liquefied gases (RLG) where concrete is used for storage and containment. Upon completion of the first edition the committee began the work of addressing the future action items from the first edition, and other changes brought before the committee.

• ACI 376 Code Revision by Rolf Pawski, Landmark Structures
• Ground Motions for Performance-Based Seismic Design of LNG Tanks by Praveen Malhotra, StrongMotions Inc.
• Navigating CFR 193 for the SSI Analysis of an Isolated LNG Tank: Challenges and Opportunities by John Powell, Arup Texas Inc.
• Thermal Corner Protection Design and Detailing Requirements by Jeffrey Garrison, Chicago Bridge Iron

Durability is one of the most important requirements for sustainable infrastructure. Federal, state, and local agencies expend significant effort to maintain the quality and condition of aging civil structures, especially those in aggressive service environments. Among many factors, durability influences the service life and integrity of concrete materials and structures. Extensive research has been conducted to understand the deterioration mechanisms of concrete in an effort to extend the longevity of concrete members. In this session, presentations of both experimental and analytical investigations are of interest, which may include the durability of concrete structures reinforced with steel or fiber-reinforced polymer bars, modeling of service life for concrete under aggressive environments, and the structural integrity and resilience of rehabilitated members. The session emphasizes recent research findings and provides an opportunity to discuss present challenges and technical issues. Critical information is given to those who lead tomorrow’s structural design and construction with an emphasis on durability, service life, and integrity, including practicing engineers, government officials, and academics.

• Fiber-Reinforced Concrete Fireproofing in Industrial Environments by Nicholas Triandafilou, Brindley Engineering Corporation
• Durability of Highly Flowable Self-Healing Concrete under Freeze-Thaw Actions by Jialuo He, Washington State University
• Structure and Properties of Alkali-Silica Reaction Gels Treated with Lithium Nitrate by Jianqiang Wei, University of Massachusetts Lowell
• NIST Engineering Laboratory (EL) Research on the Performance of Externally Bonded Fiber-Reinforced Polymer (FRP) Composite Systems in Resilient Infrastructure by Jazalyn Dukes and David Goodwin, National Institute of Standards and Technology

Graphene and its derivatives present a relatively new family of nanomaterials featuring unique quasi-2D layered structure. The thickness of single-layered graphene nanosheets is approximately 1 nm, while the median size of the lateral dimension is about 4 µm depending on the specific preparation method. Similar to carbon nanotubes and carbon nanofibers, graphene can be employed to endow cementitious materials with smart functionalities (e.g., by monitoring their stress-strain behavior). Recent laboratory studies have increasingly demonstrated that the oxygen-containing functional groups on the surfaces of graphene oxide (GO) and reduced GO make them a new type of multifunctional admixtures for cementitious materials. This session will bring to light to new frontiers and recent research findings and provide an opportunity to discuss the present challenges and technical issues. The session aims to engage a diverse group of distinguished speakers and serve to inspire researchers and practitioners who are interested in the use of graphene-based admixtures in paste, grout, mortar, and concrete.

• Ultra-Sensitive Cement Sensor with In-Situ Growth CNTs by Mimi Zhan, The Hong Kong University of Science and Technology
• Multifunctional Graphene/Cement-Based Sensors for Structural Health Monitoring by Wengui Li, University of Technology Sydney
• The Role of Carbon-Based Nanostructured Materials on the Stress-Strain Sensing and Crack Detection of E-conducting Nanoreinforced Mortar by Panagiotis Danoglidis, University of Texas At Arlington
• Effect of Graphene Oxide on the Properties of a Fly Ash-Based Geopolymer Paste Before and After F/T Damage by Zhipeng Li, Washington State University

The session will focus on live load distribution issues for concrete bridge decks and supporting girders. In addition to discussing the AASHTO methodology, other available codes/specification provisions will be reviewed. Potential topics related to live load distribution include, but are not limited to, simplification of the AASHTO methodology, traffic non-parallel to girders, construction stage issues, partial composite deck-girder systems, long-span girders, slab-span structures, and bridges with missing as-built plans.

• Load Rating of Damaged Double-Tee Girder Bridges by Mostafa Tazarv, South Dakota State University
• Load Testing of a Deteriorated Prestressed Concrete Girder Bridge without Plans by Sebastian Castellanos-Toro, Universidad Del Valle Cali
• Evaluation of Existing Prestressed Concrete Bridges and Live Load Distribution by He Zhang, Rutgers University
• Live Load Distribution Factors in an I Girder Concrete Bridge with Excessive Vibration and Partial Deck Girder Composite Action by Ikram Efaz, University of Texas Arlington
• Live Load Distribution of Slab-on-Girder Bridges Using Vision-based Measurements by Monique Head, University of Delaware
• Effects of Barriers on Load Distribution in a Concrete Slab Span Bridge by Kendall Hill, University of Minnesota Duluth
• Exploring Effects of Freight and Emergency Vehicles on Distribution Factors of Concrete T Beam Bridges Using Refined Analysis and Machine Learning by Abdou Ndong, University of Virginia
• Evaluation of In Service Reinforced Concrete Box Culverts through Diagnostic Load Testing and Refined Analysis by Amir Gheitasi, WSP USA
• Live Load on Concrete Bridge Decks by Sylwia Stawska, Auburn University
• Using Finite Element Analysis for Assessing the Live Load Distribution for Solid Slab Bridge Evaluation and Design by Bruno Massicotte, Polytechnique Montreal
• Experimental Investigation and Refined Load Rating of a Concrete Pan Girder Bridge by Nuzhat Kabir, Texas A&M University

To introduce the ACI community to concepts and opportunities to provide support structures (towers and foundations) for wind turbines. This would include tall towers for onshore wind, as well as gravity-based and floating concrete foundations for offshore wind turbines. The use of concrete support structures provides many advantages over steel solutions. For onshore wind support structures, these includes addressing transportation and erection challenges and lower costs. In addition to these, for offshore wind turbines the advantages include much longer design lives, local fabrication capacity, and overcoming the impact on sensitive marine habitats such as the North Atlantic Right Whale.

• Trends in the Wind Energy Marketplace and Expectations for the Future by Jason Cotrell, RCAM Technologies
• Innovations in Concrete Towers and Foundations for Onshore Wind Turbines by Sihang Wei, Bintong Engineering
• Innovations in Concrete Support Structures for Offshore Wind Turbines by Tor Ole Olsen, Dr.techn.Olav Olsen A.S.
• Design and Certification of Concrete Substructures for Wind Turbines by Markus Wernli, WSP USA
• Technical Challenges and Opportunities by Daniel Kuchma, Tufts University

The Open Topic Session is a forum for presenting recent technical information that could not be scheduled into other convention sessions.

• Dominant Role of Cement Paste Content on Bridge Deck Cracking by Rouzbeh Khajehdehi, SJCA Inc.
• Hydration Effects of Limestone Replacement in High Volume Fly Ash Concrete by Aniruddha Baral, University of Illinois Urbana-Champaign
• ARCTEC (Additive Regulated Concrete for Thermally Extreme Conditions): Development of Multi-Parameter Guidance for Freeze-Protection Additive Dosage by Benjamin Watts, US Army Corps of Engineers
• Effect of Tensile Strain Capacity of UHPC on the Bond with Steel Reinforcement by Amr Soliman, SUNY University of Buffalo
• Investigation of Interface Shear Transfer in Engineered Cementitious Composites by Adham Abu-Abaileh, Bradley University
• Fracture Characterization of Interfaces between Ultra-High-Performance Concrete and High-Performance Concrete by Ali Cicek, University of Delaware
• Tensile and Shear Capacity of Post-Installed GFRP Bars in Concrete by Thomas DeMars, University of Minnesota Duluth
• Early Detection of Alkali-silica Reactivity in Laboratory Concrete Prisms Using Ultrasonic Coda Wave Monitoring by Sina Mehdinia, Portland State University
• Analytical Prediction of Cover Delamination Failure Mode of RC Beams Strengthened with FRP by Fahed Salahat, Kansas State University

Awarded authors of papers published in 2020 will present winning papers. Awarded categories include: the ACI Concrete International Award, the ACI Symposium Volumes Award, the Mete A. Sozen Award for Excellence in Structural Research, the Wason Medal for Materials Research, and the Wason Medal for Most Meritorious Paper.

• ACI Concrete International Award - Concrete Q & A: Design and Construction of Slabs-on-Ground – Applying ACI 318 by Scott Tarr, North S.Tarr Concrete Consulting, P.C.
• Mete A. Sozen Award for Excellence in Structural Research - Analysis and Design of Double-Beam Coupling Beams (DBCB) by Shih-Ho Chao, University of Texas at Arlington
• Wason Medal for Materials Research - Non-Equilibrium Thermodynamic Modeling Framework for Ordinary Portland Cement/Supplementary Cementitious Material Systems by O Burkan Isgor, Oregon State University
• Wason Medal for Most Meritorious - Compliance Concept in Protection of Concrete from Freezing-and-Thawing Damage by Emmanuel Attiogbe, CEM Innovations, LLC

Dr. Asad Esmaeily was a Professor of Structural Engineering at Kansas State University between 2002 and 2018. He was an active member of ASCE-ACI joint committee 441 on Reinforced Concrete Columns for almost 18 years. He was a major contributor to the recently published document ACI 441.1R-18. His area of research was in reinforced concrete columns and health monitoring of structures. He passed away in June 2018 at an age of 59 after a short battle with cancer. His colleagues, students and fellow committee members want to pay a small tribute to him by organizing this session in his memory. ASCE-ACI joint committee 441 is sponsoring the session. The session addresses recent advances in the behavior and modeling of reinforced concrete columns subjected to different loading conditions with the presence of innovative materials. The audience of this session are anticipated to be practitioners and researchers in the area of behavior, analysis, and design of reinforced concrete columns.

• Short-and Long-Term Performance of Hollow-Core FRP-Concrete-Steel Columns by Mohamed ElGawady, Missouri S&T
• Combined Partial External FRP-Internal Steel Ties Confinement Modeling in Rectangular RC Columns by Ahmed Al-Rahmani, SK&A Structural Engineers
• Novel Element Capturing Axial-Shear-Moment Interactions in RC Columns Sustaining Seismic Degradation by Rasool Ghorbani, University of Texas San Antonio
• Dry Glass Fiber Wires Confinement for Concrete Columns by Ahmed Abd El Fattah, King Fahd University of Petroleum and Minerals
• Shear Capacity of Circular Columns Confined with FRP Wrapping by Alaaeldin Abouelleil, AEDA LLC
• A Comparative Study of Strength Assessment Methods for RC Columns by Feraidon Ataie, California State University, Chico

This session will feature presentations of original, unpublished results from ongoing research projects and leading-edge concrete technology and research throughout the world.

• Evaluation of Stress in Prestressed Concrete Structures Based on Acoustoelastic Effect by Bibo Zhong, University of Nebraska Lincoln
• Load Distribution in a Concrete Slab-Span Bridge by Kendall Hill, University of Minnesota Duluth
• Torsional Testing of Cement-Based Materials for Estimating Shear Strength by Subodh Mhamankar, Kansas State University
• Ultrafast Stiffening of Concentrated Thermoresponsive Suspensions for Additive Manufacturing by Sharu Kandy, University of California, Los Angeles
• Investigation on Protecting Mechanism of Soy Methyl Ester-Polystyrene (SME-PS) as a Concrete Surface Protectant by Mohammad Houshmand, Drexel University
• Revised Creep and Shrinkage Design Model using Solidification Theory by Timothy Clement, University of Minnesota Duluth
• Mitigation of Alkali-Silica Reaction in Concrete Using Novel pH Reducing Admixtures by Gopakumar Kaladharan, Pennsylvania State University
• Toward a Clinker-Free Binder for Concrete by Melissa McAlexander, Oregon State University
• Effects of Thermal Cycling Rate and Pore Confinement on Thermal Behavior of Phase Change Materials in Lightweight Aggregates for Deicing and Low-Temperature Applications by Robin Deb, Drexel University
• Does ITZ Influence Moisture Transport in Concrete? by Laura Dalton, North Carolina State University
• Mitigating Steel Corrosion in Reinforced Concrete Structures Using Hydrophobic Sealer by Goran Adil, University of Missouri-Kansas City

Major seismic events around the world along with the aging and deterioration of infrastructures keep increasing the need for repair/strengthening and rehabilitation of existing bridges. Seismic repairing and strengthening are an area that has seen major developments due to the availability of robust numerical simulation frameworks, large experimental facilities, structural health monitoring techniques, development of advanced materials and construction techniques, and sophisticated performance-based seismic design and assessment methodologies. Despite the progress, there are many challenges yet to be addressed. With the increase in transportation demand and more stringent seismic performance requirements, bridge retrofit, and repair is an important task for engineers and researchers. Bridge retrofits usually involve functional upgrades (such as deck widening) and seismic upgrades (such as strengthening seismic load path). The effects of the two upgrades are usually coupled and need to be analyzed. Therefore, more sophisticated analysis and customized solution is needed. While providing structural upgrade solutions to seismic issues, engineers also need to reduce the interruption to the traffic as much as possible. Development and implementation of innovative retrofit and repair methods are expected to upgrade deficient bridges to current standards and minimize traffic interruption. The main objective of this session is to present results from recent research studies (experimental/numerical/analytical) and practical examples of existing bridge retrofit and repair. This session will provide a forum for practicing engineers and researchers to share and discuss the various issues related to design and construction issues of seismic repair/retrofit/strengthening of bridges at the element and system level.

• Seismic Retrofit and Quick Repair Technique for Bridge Columns Through Transverse Prestressing by Murat Saatcioglu, University of Ottawa
• Shape Memory Alloy Based Dampers used for Seismic Retrofit of Continuous Bridges with Unequal Height Piers by Nailiang Xiang, Nagoya Institute of Technology
• Rapid Repair of Reinforced Concrete Columns Using a Mechanically Fastened Steel Jacket by Taylor Brodbeck, North Carolina State University
• Proposed Shear Design Equation and Reliability Analysis for Shear-Critical RC Beams Strengthened with Inorganic Composites by Tadesse Wakjira, The University of British Columbia
• Rapid Repair of Hollow-Core FRP-Concrete-Steel Columns by Mohamed ElGawady, Missouri S&T
• Multi-Column Bridge Bent Considering Different Jacketing Options by Abu Chowdhury, University of British Columbia
• Precast Bridge Columns with Replaceable Components for Quick Repair by Mostafa Tazarv, South Dakota State University
• Seismic Performance of Retrofitted and Repaired Bridge Column Under Major and Several Aftershocks by Saif Aldabagh, University of British Columbia
• Full-Scale Evaluation of a Repair Measure of Earthquake Damaged Bridge Column by A K M Golam Murtuz, Portland State University
• Behavior of UHPFRC Strengthened Bridge Piers Under Lateral Impact Loads by Gholamreza Gholipour, Lakehead University
• Performance-based Seismic Assessment of Highway Bridges with Superelastic SMA Reinforced Piers and Restraining Devices by Shuai Li, The University of British Columbia

The objective of this session is to introduce the latest design and research of using shrinkage compensating concrete for various structural concrete, including bridge decks, and in structural repair materials to help avoid drying shrinkage cracking. Different types of shrinkage compensating concrete will be discussed and how it is produced in design mixes and how it effects early strength properties in comparison to normal Portland cement design mixes.

• Behavior of Type K Shrinkage Compensating Concrete Under Mechanical Restraint by Stephen Roswurm, University of Oklahoma
• Interaction between Shrinkage Mitigating Materials to Reduce Shrinkage Cracking in Concrete Bridge Decks by Iman Mehdipour, Carbonbuilt

In the last decade ultra-high-performance concrete (UHPC) has significantly attracted the interest of researchers and practitioners due to its material performance and its potential for innovative practical applications. It has become one of the most influential materials in the construction industry in the twenty-first century. After years of innovations in material, structural and architectural design what are the current UHPC hot topics? This session will invite national and international research groups, material suppliers and contractors to share their knowledge of hot topics of UHPC.

• Structural Response of UHPC Columns by Mahmoud Aboukifa, University of Nevada
• Performance Evaluation of Ultra‐High‐Performance Fiber‐Reinforced Concrete Columns (Development of P‐M Interaction Diagrams) by Marwa Mahmoud Ibrahim, University of Calgary
• Design UHPC Structure with High Deformation Capacityt by Yi Shao, Stanford University
• Identification of the Tensile Constitutive Relationship for UHPC: Indirect Tension Tests vs. Back Analysis of Flexural Tests by Dr. Liberato Ferrara, Polytechnic University of Milan
• Strain Capacity of Strain‐Hardening UHP‐FRC Part I: Steel Fibers by Dr. Antoine E Naaman, University of Michigan
• Strain Capacity of Strain‐Hardening UHP‐FRC Part II: Synthetic Fibers by Surendra Shah, The University of Texas at Arlington
• Implementation of UHPC for Long-Span Precast Pretensioned Elements: Materials by John S Lawler, Wiss, Janney, Elstner Associates, Inc.
• Development and Testing of High/Ultra High Performance Concrete for Durable Bridge Components and Connections by Kay Wille, University of Connecticut
• Non‐Proprietary Ultra‐High Performance Concrete for Precast Bridge Decks Field Joints by Dr. Mohamed Moustafa, University of Nevada, Reno
• Performance Density Diagram Developed with Machine Learning Models to Optimize Mixture Design of Sustainable UHPC by Cesario Tavares, Texas A&M University
• Experimental Behavior and Numerical Modeling of Reinforcement by Dr. Matthew J Bandelt, New Jersey Institute of Technology
• New Approaches to Architectural UHPC by Larry Rowland, Ceentek North America
• UHPC Overlay Installation Methods – Contractor Perspective by Peter Seibert, UHPC Solutions
• Effect of Thixotropic UHPC on Interfacial Properties as an Overlay by Jiang Du, Stevens Institute of Technology
• Seismic Performance of Reinforced Concrete Columns Strengthened with Ultra-High-Performance Fiber Reinforced Concrete and Shape Memory Alloy by Adel Al Ekkawi, University of Calgary
• Field Implementation of UHPC Beam End Repair on Steel Girder Bridges in Connecticut by Alexandra Hain, University of Connecticut
• Sprayed UHPC for Structural Reinforcement or Protection by Sebastien Bouteille, CETU

Continuous developments in concrete technology and reinforcement materials have been made in recent years to improve the structural performance, durability and sustainability of reinforced concrete. The use of alternative types of concrete and/or reinforcement may affect the bond characteristics of reinforcing bars and, consequently, their development and lap-splice requirements. This session will present recent advances in the characterization of bond and development in new types of concrete and reinforcement, which may include (but are not limited to) ultra-high-performance concrete, fiber-reinforced concrete, self-compacting concrete, high-strength steel, corrosion-resistant reinforcement, and shape-memory alloy bars.

• Bond Between Steel and Steel Fiber-Reinforced Concrete Under Normal and Elevated Temperature by Akanshu Sharma, University of Stuttgart
• Bond Behavior of Carbon Fiber-Reinforced Polymers in Ultra-High-Performance Concrete by Nariman Khalil, University of Balamand
• Compressive Bond Behavior of Shape Memory Alloy (SMA) Rebar in Concrete by AHM Billah, Lakehead University
• Bond Behavior of Ribbed Iron-Based Shape Memory Alloy Bars Embedded in Concrete by Ghassan Fawaz, University of Texas at Austin
• Bond-slip Behavior Between Geopolymer Concrete and Deformed Steel Bar by Maria Antonietta Aiello, University of Salento
• Advances on Bond of Embedded Steel Reinforcement in the New Model Code 2020 by Giovanni Metelli, University of Brescia; Giovanni Plizzari, University of Brescia; and J. Cairns, Heriot-Watt

This presentation is on the use of laser scans and drones. It will describe a method of laser scanning a concrete surface to characterize the waviness of that surface and provide feedback to owners and concrete finishers. The comparative analysis of the various methods of measuring waviness in concrete slabs reveals that the 2-Dimensional (2D) Continuous Wavelet Transform (CWT) provides results that strongly correlate with those of the Waviness Index method (the current state of the art), but has numerous advantages over it and other existing methods. The next step in this study is to use this method in conjunction with augmented reality (AR) devices to enable the visualization of undulations corresponding to various characteristic periods on site. AR technology would provide visual information (3D laser scan data + ideal flat concrete surface) on surface waviness for comparison, which would enable timely decision making, and ultimately reduce project delays and extra costs associated with demolition and reconstruction.

• Use of Laser Scans and Drones to Measure Concrete Floor Waviness/Flatness Automatically by Yelda Turkan, Oregon State

The Open Topic Session is a forum for presenting recent technical information.

• Use of Super Absorbent Polymers for Frost Resistance in Concrete Placed using Admixture-Based Freeze Protection by Danielle Kennedy, U.S. Army Engineer Research and Development Center; and Benjamin Watts, U.S. Army Engineer Research and Development Center
• Correlation Between Test Methods to Characterize Tensile Behavior of UHPC by Daniel Bridi Valentim, University of Alabama; Sriram Reddy Aaleti, University of Alabama; and Michael Kreger, University of Alabamar
• The Assessment of Interlayer Adhesion of Cold Joint in 3-D Printing Mortar by Kho Pin Verian, LATICRETE International, Inc.; Jarron Ashcroft, LATICRETE International, Inc.; Matthew Carli, LATICRETE International, Inc.; Randall Bright, LATICRETE International, Inc.; and Eerik Maandi, LATICRETE International, Inc.
• The Effect of Gas Solubility on Water Sorption Rate in Cement-Based Materials Using X-ray CT by Laura Dalton, North Carolina State University; Karl Jarvis, U. S. Department of Energy National Energy; and Mohammad Pour-Ghaz, North Carolina State University

The Open Topic Session is a forum for presenting recent technical information.

• Flexural Performance of Reinforced Concrete Beams Fabricated with Ground Glass and Fly Ash by Ben Dymond, University of Minnesota Duluth; Mary Christiansen, University of Minnesota Duluth; and Nicholas Johnson, AMI Consulting Engineers
• The Impact of Reinforcement Layers, Side Cover, and Bond Stress on Knee Joints Under Closing Moments by Hwa-Ching Wang, Purdue University; and Christopher Williams, Purdue University
• Shear Testing of Prestressed Concrete Bridge Girders by Eva Lantsoght, Delft University of Technology & Universidad San Francisco de Quito; Gabriela Zarate Garnica, Delft University of Technology; Fengqiao Zhang, Delft University of Technology; and Yuguang Yang, Delft University of Technology
• Damage Accumulation Resulting in Degradation of Strength and Stiffness in Concrete Subjected to Uniaxial Compressive Fatigue Loading by Somashekar Viswanath, University of Illinois at Urbana-Champaign; James Michael LaFave, University of Illinois at Urbana-Champaign; and Daniel Alexander Kuchma, Tufts University

The fabrication of novel reinforced concrete structures using digital technologies necessarily requires the definition of suitable strategies for reinforcement implementation. Reinforcement integration has to be compatible with either the specific printing technique adopted for the structural element production or with its shape. This Session aims to provide to engineers, architects and researchers actively involved or simply interested in 3-D printing with cementitious composites the latest updates on opportunities and techniques using “reinforced concrete” that have been developed so far in order to further expand the outreach of digitally fabricated concrete materials and structures.

• Reinforcing 3-D Printed Concrete: The Missing Link by Jacques Kruger, Stellenbosch University; Gideon Van Zijl, Stellenbosch University; F A Bester, Stellenbosch University; M Van Den Heever, Stellenbosch University
• New Reinforcement Concepts for Digitally Fabricated Concrete Structures by Jaime Mata-Falcón, ETH Zürich
• High-Performance Concrete for 3-D Printed Precast Applications by M. Liard, Sika Technology; R. Bourquin, Sika Technology; and D. Lootens, Sika Technology
• The Adaptation of Conventional Reinforcing and Anchoring Methods for Additively Constructed Concrete (ACC) by Eric Kreiger, U.S. Army Construction Engineering Research Laboratory
• External Reinforcing System for 3-D Printed Concrete Elements: Technology and Design Approach by Costantino Menna, University of Naples Federico II; Ferdinando Auricchio, The University of Pavia; and Domenico Asprone, University of Naples Federico II
• Early-Age Mechanical Performance of Fiber-Reinforced Mortars Used in 3-D Printed Concrete Construction by Liberato Ferrara, Politecnico di Milano; Marta Fioretti, Politecnico di Milano, Kasyapa Sriram Kompella, Politecnico di Milano, Laura Esposito, University of Naples Federico II; Costantino Menna, University of Naples Federico II; and Francesco Lo Monte, Politecnico Di Milano

Textile Reinforced Concrete (TRC) materials have been addressed several times at the ACI conventions in the past 14 years. This area has been led by several RILEM Committees, fib, and ACI Committee 549. The first TRC committee was formed in July 2002, the RILEM TC 201-TRC (Textile Reinforced Concrete). The work of this committee was followed by Technical Committee 232-TDT addressing Test methods and design of textile reinforced concrete, developing recommendations of test methods and design of the composites. ACI has had a very strong presence in the international development of these materials. Various research groups have developed a wealth of recent information pertaining the methodologies, properties, and areas of applications for fabric reinforced cement-based materials. The theoretical framework will address aspects of multi-scale modeling, analytical tools to predict and design components for tensile, flexural, and shear loading of TRC composite systems. these sessions would be of interest to researchers, structural engineers and concrete repair professionals.

• Reinforced Concrete Columns Confined with FRCM: Experimental Performances, Analytical and Numerical Modeling by Salvatore Verre, University of Calabria
• Design Formula for FRCM-Strengthened Masonry Elements Under Compression and Shear Load by Alessio Cascardi, University of Salento
• Flexural Behavior of Carbon Fiber Textile-Reinforced Concrete I-Section Beams by Daniel Cardoso, Pontifical Catholic University of Rio de Janeiro (PUC-Rio); (Authors: Kissila Botelho Goliath, Daniel C. T. Cardoso and Flavio de A. Silva; Affiliations: Pontifical Catholic University of Rio de Janeiro (PUC-Rio)).
• An Overview of the Tensile and Bond Behavior of Fabric-Reinforced Cementitious Matrix (FRCM) Composites by Gianmarco De Felice, Roma Tre University
• Blast Retrofit of Stone Masonry Walls Using FRCM Composites by Hyunchul Jung, University of Ottawa
• On the Synergetic Action between Strain-Hardening Cement-Based Composites (SHCC) and Carbon Textile Reinforcement Under Tensile Loading by Ting Gong, Dresden University of Technology
• Influence of the Test Set-Up on the Bond Behavior of FRCM Composites by Angelo Savio Calabrese, Politecnico Di Milano
• Utility of Glass and Carbon Fabrics in Ultra-High-Performance Cementitious Matrixes by Bekir Yilmaz Pekmezci, Istanbul Technical University
• Carbon Reinforced Concrete Under Cyclic Tensile Loading by Arne Spelter, Institute of Structural Concrete at the RWTH
• The Villa Horti Complex in Milan and the 25 Hours Hotel in Florence: Two Prestigious Buildings Entirely Retrofitted with FRCM and SRG Composite Materials by Paolo Casadei, Kerakoll Group

To demonstrate how effective teams overcome constructability challenges by utilizing the knowledge of the contractor, engineer, architect and owner.

• Panel Discussion on Constructability by Chad Hensley, Wayne Brothers, Inc

To raise awareness about the technique of shotcreting vertical concrete elements with an architectural finish.

• The Use of Architectural Shotcrete by Frank Townsend, Patriot Shotcrete, LLC

The session is intended to present advances in service life modeling specially with respect to benchmarking of the available design codes to determine what service life can be anticipated when the structures are designed in accordance with the current prescriptive and/or deemed-to-satisfy requirements of the various countries’ design codes and standards specifically for the chloride exposure. This may include service life modeling based on both accelerated laboratory testing and/or assessment of the existing structures. Further, benchmarking the currently available models on the chloride penetration into the concrete using real case studies is also a main objective of this session.

• Performance Evaluation of Code Approaches in Durability Design of Concrete Structures by Richard Cantin, SIMCO Technologies, Inc
• Long-Term Chloride Penetration Resistance of Silica Fume Concretes Based on Field Exposure by Doug Hooton, University of Toronto
• Comparison of Various Service Life Models and Their Input Parameter Testing by Neal Berke, Tourney Consulting Group, LLC
• Field Verification of Service Life Models of Existing Structures by Marwa Abdelrahman, Wiss, Janney, Elstner Associates, Inc
• Service-Life Model Bench Marking Using Data Collected from Marine-Exposure Sites by Alessandro Fantilli, Polytechnic University of Turin

Concrete is the world’s most widely used construction material. Yet, the production of portland cement, an essential constituent of concrete, leads to greenhouse gas emissions into the atmosphere. The production of 1 ton of portland cement clinker releases approximately one ton of CO2 and other greenhouse gases. Environmental considerations have been a major thrust for the sustainable development of the cement and concrete industries. A sustainable concrete structure is designed and built to have a positive environmental footprint during its entire life cycle. Concrete is increasingly being considered as a sustainable material owing to its low inherent energy requirements and little associated waste. Not only is it made from some of the most plentiful resources on Earth, it can also be made with numerous recycled materials and by-products and is itself entirely recyclable. Emerging breakthroughs in concrete technology have allowed producing ultra-high-performance concrete requiring less raw materials, along with structures that are much more durable to reduce maintenance, repair, and reconstruction

• Fracture Properties and Restrained Shrinkage Cracking Resistance of Recycled Steel Fiber Reinforced Cement Mortars by Xijun Shi, Texas State University
• Fresh, Mechanical, and Durability Properties of Steel Fiber-Reinforced Rubber Self-Compacting Concrete (SRSCC) by Jiaqing Wang, Michigan Technological University
• Aggregate and Petrographic Laboratory (APL) Research Program by Mengesha Beyene, SES Group & Associates, LLC
• The Effect of Hydraulic Cements on the Flexural Behavior of Wool Reinforced Mortars by Alessandro Fantilli, Polytechnic University of Turin
• Performance of Concrete Containing Water-Hyacinth Ash (WHA) as Cement Replacement – Resistance to Elevated Temperature and Seawater Exposures by Ahmed Omran, New Jersey Institute of Technology & Massachusetts

The symposium is on design of concrete slabs to sustain satisfactory serviceability over a long-life span. The goal is to guide on the design of relatively thin slabs needing no repair over a service life exceeding 100 years. Papers addressing vulnerability of slabs to excessive deflection or punching are invited.

• Experimental Testing of a Real Scale Flat Slab Building for Gravity and Lateral Loading by Dario Coronelli, Polytechnic University of Milan
• Application of Strip Model to Edge Column-Slab Connections with Outward Eccentricity by Scott Alexander, University of Alberta and Eva Lantsoght, Universidad San Francisco de Quito
• Updates to ACI 421 Design Guides by Mustafa Mahamid, University of Illinois at Chicago

There has been much discussion in ACI, and the concrete community in general, on the benefits of Internal Curing of concrete using pre-wetted lightweight aggregates. Internal curing can also be accomplished using other materials such as super absorbent polymers (SAP). This session, which is sponsored by committee 213, presents new research results on specific effects of internal curing, including: resistance to freezing and thawing; effects on self-consolidating concrete; results of electrical resistivity measurements; transport properties and pore water potential development; and corrosion-based service life prediction of reinforced concrete structures. These new papers are relevant to many aspects of concrete construction, including infrastructure projects. In order for the implementation of internal curing to continue to accelerate, the answers this session provides need to be widely disseminated. This is a direct reflection of the mission of Committee 213: “Develop and report information on mineral lightweight aggregates and structural lightweight concrete made with such aggregates.” The speakers for this session have all been directly involved in the research being reported.

• Freeze and Thaw Performance of Internally Cured Concrete by Rita Ghantous, Oregon State University
• Coupled Effect of Lightweight Aggregate and Shrinkage Mitigation Strategies on Performance of SCC by Kamal Khayat, Missouri University of Science and Technology
• Effects of FLWA- based IC on Electrical Resistivity Measurements by Armen Amirkhanian, University of Alabama
• Improving Service Life of Reinforced Concrete Structures Using Internal Curing by Timothy Barrett, GCP Applied Technologies

This session will contain presentations about the design of reinforced and prestressed concrete elements for torsion. The focus is on practical design examples according to different concrete bridge and building codes. In addition to the design examples, presentations dealing with the current state-of-the-art on torsion in structural concrete, as well as recent advances in the analysis and design of concrete elements failing in torsion will be added.

The objectives of this session are to provide practicing engineers with the tools necessary to better understand and design concrete elements for torsion. Usually, the attention that is paid to torsion in engineering education is limited to simplified textbook examples. The examples in this session will show applications in bridges and buildings, where the torsion design is combined with the design for flexure and shear. Additionally, the examples will give insight in the different outcomes when using different bridge and building codes. Finally, the theoretical presentations will give practicing engineers a deeper understanding and background on torsion in structural concrete.

• Design Example of Bridge Pier Cap Beam Considering Torsional Effect by Yang Yang, University of Hartford
• Torsion Design Example: Prestressed Concrete Girder Bridge by Kevin Benitez, Polytechnic University of Milan

With climate change, it's becoming increasingly challenging to anticipate every type and frequency of disruptive threats. Therefore, concrete structures need to be designed with resiliency in mind in order to respond, absorb, and adapt to a variety of disruptive event in order to maintain functionality during and after the event. During this session, we will explore topics related to designing resilient concrete structures. We will discuss potential threats, and the critical factors of resilient infrastructure. We will look at current resilience-based performance standards and resources. This session contains valuable information for designers, manufacturers, educators and specifiers.

• Resiliency Based Performance Standards & Resources by Julie Buffenbarger, Beton Consulting Engineers, LLC
• Current Resiliency Based Initiatives and Impacts on Concrete Design by Scott Campbell, National Ready Mixed Concrete Association
• Enhanced Resilience: Notable Programs and Strategies by Stephen Szoke, American Concrete Institute

Awareness of atypical corrosion mechanisms and potentially corrosive environments can be useful for durable design and developing durability standards. It is known that corrosion of reinforcing steel can occur from excessive chlorides or carbonation. However, corrosion may also occur from less commonly known phenomena or unanticipated exposure (including building interiors). Conversely, some concrete may outlive expected service-life

• Acid Tank Foundation Failure by Peter Bowlin, Ragland, Aderman & Associates, Inc

Nano particles designed for cement composites and concrete have been successfully used in laboratory and field applications over the last 20 years to enhance both the strength and durability of concrete. The following session will identify the dispersion of nano-based additives and admixtures for commercial concrete that focus on increase the strength and durability of concrete to physical and chemical attack. This session will emphasize concrete laboratory and field applications have been at the forefront of construction for the last decade. Pros and cons will be discussed in the to facilitate a realistic view for new solutions to ongoing issues.

• Industrial Application of In-Situ Carbonate Nanoparticle Seeding by Sean Monkman, CarbonCure Technologies
• Nano Silica-Enhanced Pavements—Paving the Way for a More Durable Concrete by Whitney Le Belkowitz, Intelligent Concrete
• Relationship Between the Carbon Nanotube Dispersion State, Electrochemical Impedance and Capacitance and Mechanical Properties of Percolative Nanoreinforced OPC Mortars by Maria Konsta, University of Texas at Arlington
• Amendment of Cement Paste with Low Concentrations of Well-Dispersed Partially Unzipped Carbon Nanotubes by Shohana Iffat, University of South Carolina
• Role of Dispersion Degree of Nanoclays In Controlling Viscoelastic Properties of Fresh Cement Pastes by Ala Eddin Douba, Columbia University

The Open Topic Session is a forum for presenting recent technical information that could not be scheduled into other convention sessions.

• Alkali-Silica Reaction-Affected Reinforced Concrete Elements Subjected to Pure Shear by Anca-Cristina Ferche, University of Toronto
• Resilient Seismic Retrofit of Non-Ductile Code-deficient Reinforced Concrete Shear Walls: Experimental Study by Sina Basereh, University at Buffalo
• NCHRP 51-13: Synthesis - Load Rating of Bridges and Culverts with Missing or Incomplete As-Built Information by Harry "Tripp" Shenton, University of Deleware
• Linking Pore Solution Chemistry of Concrete to ASR Potential Through Machine Learning as a Performance Based Approach by Pravin Saraswatula, Affiliation: Texas A&M University
• Recommendations for Modelling Lightly Reinforced Concrete Walls using PERFORM-3D by Anahid Behrouzi, California Polytechnic State University

Durability of concrete is directly related to the ability of concrete to impede the transport of water and aggressive species such as chlorides. Transport can occur under different mechanisms and often more than one mechanism is involved. Accurate modeling and measurements of transport requires understanding of the mechanisms involved. This session aims to provide the recent advances in measuring and modeling mass transport in concrete with implications on service life prediction of reinforced concrete structure subjected to a variety of degradation mechanisms.

• Transport in Concrete – Using the Formation Factor Effectively by Keshav Bharadwaj, Oregon State University
• Using X-Ray CT to Understand Greenhouse Gas and Water Migration in Cement-Based Materials by Laura Dalton, North Carolina State University
• Transport in Concrete – Modeling Reactions by O Burkan Isgor, Oregon State University
• Relating Water Permeability to Electrical Resistivity and Chloride Penetrability of Concrete Containing Different Supplementary Cementitious Materials by Caitlin Tibbetts, University of Florida
• Imaging of 3-D Flow Phenomena in Cement-Based Materials Using X-Ray CT and Electrical Capacitance Tomography by Moe Pour-Ghaz, NC State
• Characterization of Transport Properties for Service Life Prediction by Elizabeth Wagner and Joshua White, Wiss, Janney, Elstner Associates, Inc

The session theme is the performance and design of FRP reinforced columns. In this session, the latest research addressing experimental and analytical research findings on the FRP-RC columns. A large part of the body of knowledge of FRP reinforced structures addresses the performance of beams and slabs. A comparatively limited number of studies investigated columns. The dissemination of research into the performance of FRP-RC columns is necessary to help advance design codes and, consequently, wider adoption of FRP bars in construction.

• Proposed Slenderness Limit for GFRP-RC Columns Based on Experiments and Buckling Analysis by Waseem Abdelazim, University of Sherbrooke
• CFRP Reinforced Concrete Columns under Eccentric Loading by Murat Saatcioglu, University of Ottawa
• Seismic Response of Concrete Columns Internally Reinforced with GFRP by Shamim Sheikh, University of Toronto
• Nonlinear Moment-Curvature Response and Ductility of Hybrid Reinforced Concrete Columns by Sherif Osman, University of British Columbia
• Shear Strength of Hollow-Core FRP-Concrete-Steel Columns by Mohamed ElGawady, Missouri University of Science and Technology

This session will feature presentations of original, unpublished results from ongoing research projects and leading-edge concrete technology and research throughout the world.

• Combined Effect of Chloride and Sulfate Ions in Cement-based Materials by Alvaro Paul, Universidad de los Andes, Chile
• Assessment of Gradient Inelastic Flexibility-Based Theory for Shear-Critical RC Members by Mohammad Aghajani Delavar, Texas A&M University College Station
• Experimental and Analytical Investigation of Concrete Subjected to Variable Amplitude Fatigue Loading by Somashekar Viswanath, University of Illinois Urbana-Champaign
• Stainless Steel Strands for Pretensioned Concrete Girders by Anwer Al-Kaimakchi, Florida State University
• Behaviour of UHPFRC Subject to Pure Shear by Brittany Yap, University of Toronto
• Retrofit of Existing Foundation to Convert Traditional RC Wall into Rocking Wall Using Ultra High-Performance Concrete (UHPC) by Sumedh Sharma, University of Alabama

This session will feature presentations of original, unpublished results from ongoing research projects and leading-edge concrete technology and research throughout the world.

• A Thermodynamics-based Framework Production of Porous Lightweight Aggregate (LWA) from Waste Coal Combustion Ash (W-CCA) by Mohammad Balapour, Drexel University
• Evaluation Quality of 3D Printed Clay Objects Using a 3D Structured Light Scanning System by Kwangwoo Wi, Iowa State University
• Synergistic Effects of Air Content and Supplementary Cementitious Materials in Reducing Damage in Concrete Exposed to High Concentrations of Deicing Salt and Various Temperature Conditions by Nima Hosseinzadeh, University of Miami
• Performance of Corrosion Inhibitors in Lab and Field Testing by Bruno Fong-Martinez, 'the University of Texas at Austin

The word “sustainability” leads one immediately towards factors such as carbon emissions and renewable energy. But the true aim of sustainability, represented by the “three-legged stool”, is to find the balance between environmental impacts, economic costs, and the social benefits of any action taken. As we work to lessen the environmental impact associated with concrete construction, we often lose sight of the balance sustainability truly seeks. The goal of being “green” is often in direct conflict with either constructability, cost, or both. If sustainability is becoming more environmentally centric, is it necessary to start thinking of constructability and cost as being the other two legs of a new “three-legged stool”? How, as an industry, do we meet our goals of being good stewards of the environment while being mindful that a green design is of little social value if it cannot be constructed at a reasonable cost? In this session the speakers will discuss the design and construction challenges of being “green” while also trying to meet the necessary goals of constructability and “cost-ability”.

• Concrete Construction Practices that Meet Current Development Needs Without Compromising the Future by John Hausfeld, Baker Concrete Construction, Inc.
• Sectional Shear Strength Analysis and Strengthening Design of Garage Post-Tensioned Beams and Girders by Kurt Tyler, Wiss, Janney, Elstner Associates, Inc.
• Unlikely Green Champions: How Concrete Suppliers and Structural Engineers Can Lead the AEC Industry to a Low Carbon Future by Emma Reif and Patrick Kenny, Thornton Tomasetti
• SDC Innovations in Concrete: Sustainability, Constructability, and “Cost-ability” – The New Three-legged Stool? - Panel Discussion

These are special sessions honoring a long time Carolinas Chapter member (and ACI Honorary member), Calvin McCall. The focus of the sessions includes specifications, workable concrete mixtures, and constructability.

• 30 Years of Writing and Enforcing Specifications: A Journey from Conservative Specifications to Progressive Specifications to Realistic Specifications by Henry B Prenger, LafargeHolcim
• Durability Performance Testing: The Devil is in the Details by R Doug Hooton, University of Toronto
• ACI Specification Writing Process by James Cornell, JN Cornell Associates, LLC
• Large Format Tiles and Floor Flatness Specifications by Ronald Kozikowski, North S.Tarr Concrete Consulting, P.C.
• Initial Curing of Concrete Test Cylinders by Frank A Kozeliski, Kozeliski Consulting LLC
• Performance: Starting with the End in Mind, for Work, Organizations, Homes, and Relationships by Kenneth Hover, Cornell University

3-D printing has garnered a lot of excitement in the concrete community due to its potential benefits for the concrete construction (cost reduction, construction time reduction, and design freedom). However, it's not as easy as it looks. This session will provide an overview of 3-D printing and discuss the common challenges and advice on how to avoid them.

• Digital Construction: An Ongoing Exploration on Design and Development of Printable Mixture and Printing Process by Maryam Hojati, University of New Mexico
• Real-Time Extrusion Quality Monitoring Techniques for Construction 3-D Printing by Ali Kazemian, Louisiana State University
• Scaling Construction 3-D Printing by Alex Le Roux, ICON
• Steel Reinforced Digitally Fabricated Concrete Beams: Technology and Experimental Assessment by Costantino Menna, University of Naples Federico II
• Building Code Compliance of 3-D Concrete Walls Constructed Using 3-D Printing Construction Technology in the U.S.A. by Mahmut Ekenel, ICC Evaluation Service, LLC
• Considerations for Deploying Additive Construction by Eric Kreiger, U.S. Army Engineer Research and Development Center

The session objective is to present state-of-the-art and emerging methodologies for the strength or serviceability evaluation of signature concrete bridges. Bridge designers, inspectors, owners, leading industry experts, students, and academicians should attend the session. The potential list of topics includes, but is not limited to: load testing at or beyond service, use of load testing for load rating or maintenance, advanced numerical or computational analysis, structural versus element rating, determination of structure specific reliability indices, use of continuous monitoring for detecting anomalies, novel inspection techniques.

• Condition Evaluation and Monitoring for Management of Post-tensioned Segmental Concrete Bridges by Michael Brown, WSP USA
• A Case Study - Marquette Interchange Pier TS7 by Tony Shkurti, HBTB Corp
• GCRTA Special Bridge Inspection: Instrumentation, 3D FEM Calibration, and Analysis of an In-Service LRT Bridge by Kent Dickens, HDR, INC
• Use of Advanced Bridge Evaluation Techniques for the Blatnik Bridge by Andrew Foden, WSP USA

This session will review the use of current technologies available to reduce shrinkage in concrete, including mineral and chemical admixtures and various alternative approaches in concrete mixture designs. Cracking due to restrained shrinkage is one of the primary contributors to cracking, particularly in concrete flatwork, which potentially reduces the service life and increases the required long-term maintenance of concrete structures. Mitigation of different shrinkage mechanisms in concrete can be accomplished through combinations of shrinkage reduction technologies. A review of how these technologies affect concrete properties and shrinkage behavior will be presented. Completed research and full-scale field observations will examine the effectiveness of an array of shrinkage reduction technologies.

• From Design to Reality - How to Significantly Reduce Shrinkage and Cracking Using Fibers by Samhar Hoz, International Code Council
• High Performance Concrete Containing SCMs and LWA for Internal Curinge by Yuguo Zhong, University of Michigan
• Evaluation of a Modified ASTM C157 for Early-Age Volume Change in Concrete by Matthew O'Reilly, University of Kansas

The provisions for anchorage in ACI 318 (Ch. 17) have found increasing use for questions involving reinforcement anchorage, although an explicit formulation of splitting resistance is lacking. Conversely, the provisions for bar development, which focus primarily on concepts of bond and splitting, do not directly consider breakout failure modes that may be decisive, particularly in closely spaced bar groups. The use of, e.g., headed bars in groups terminating in sections with small edge distance, and the extensive use of reinforcing as anchorage in nuclear construction have raised questions about the adequacy of current provisions to provide adequate safety margins for all cases.

This session will focus on recent work to understand the behavior of reinforcing bars used for anchorage with respect to failure modes and predictive models, including cast-in reinforcing, post-installed reinforcing, high-strength reinforcing, straight bars, bars with mechanical anchorage (headed bars), and hooked bars. Behavior in normal weight, HPC, fiber-reinforced, and other concrete variants is included. The committee is asking for contributions that reflect both experimental, analytical, and code development work in this area.

• Behavior and Design of Connections Between Column and Foundation with Cast-in and Post-Installed Reinforcing Bars by Rolf Eligehausen, University of Stuttgart
• Anchorage of Groups of Straight Bars in Plain Concrete by Amit Varma, Purdue University
• Column-Foundation Connections with Cast-in-place Headed Anchors by Jack Moehle, University of California, Berkeley
• The Case for a New Approach to Anchorage in the Code by John Silva, Hilti North America

This session will provide industry insight from SCA representatives on how slag cement is being used to create more durable, sustainable, and resilient concrete.

• The Influence of Slag on Reducing Concrete Pavement Joint Deterioration by W Jason Weiss, Oregon State University
• Demonstrating Resilient and Sustainable Concrete Benefits with Slag Cement by Shawn Kalyn, St. Marys Cement

This session intends to introduce to the concrete industry a new development on using nanofibers for several applications in concrete. Researchers the possible use of nanofibers to enhance cement hydration, add new functionalities (e.g., sensing and energy harvesting) and improve mechanical properties of concrete using nanofibers. Research has also shown the ability of new types of nanofibers to facilitate 3D-printing of concrete. Through this distinguished group of diverse speakers, this session will introduce to concrete researchers, engineers, suppliers, and contractors, how nanofibers are opening new frontiers in concrete technology.

• Utilization of Cellulosic Nanofibers for the Performance Enhancement of Portland Cement-based Materials by Warda Ashraf, University of Texas-Arlington
• Energy Harvesting Cementitious Materials through Nanofiber Incorporations by Yen-Fang Su, Purdue University
• Expanding Working Domain of Cement Based Matrices via Molecular Scale Engineered C-S-H by Konrad Krakowiak, University of Houston
• Corrosion Damage Detection of Reinforced Concrete Modified by Carbon Nanotubes and Carbon Nanofibers by Panagiotis Danoglidis, University of Texas At Arlington
• 3-D-Printed Polymer Concrete Using Carbon Nanofibers by Mahmoud Reda Taha, University of New Mexico
• Mechanical and Microstructural Properties of Cement Pastes with Rice Husk Ash Coated with Carbon Nanofibers Using a Natural Polymer Binder by Nima Farzadnia, Missouri University of Science and Technology

The session objective is to present state-of-the-art and emerging technologies for the strength evaluation and design of concrete bridges using advanced computational analysis and load testing methods. The following topics are considered: advanced nonlinear modeling and nonlinear finite element analysis (NLFEA), structural versus element rating, determination of structure specific reliability indexes, load testing beyond the service level, load testing to failure, and use of continuous monitoring for detecting anomalies.

• Inelastic Shear Distribution in Prestressed Concrete Girder Bridges by Ben Dymond, University of Minnesota Duluth; Carol Shield, University of Minnesota; and Catherine French, University of Minnesota
• Evaluation of the Orientation of Concrete Finishing Machines in Skewed Bridges Using Finite Elements by Brandon Gillis, Faress Hraib, Saint Louis University; Li Hui, Saint Louis University; and Riyadh Hindi, Saint Louis University
• Using Nonlinear Finite Element Analysis for Bridge Evaluation: Challenges and Perspectives by Mahdi Ben Ftima, Polytechnique Montreal; Bruno Massicotte, Polytechnique Montreal; and David Conciatori, Universite Laval
• Advanced Numerical Modeling Methodology for Strength Evaluation of Deep Bridge Bent Caps by Serhan Guner, University of Toledo; and Anish Sharma, University of Toledo
• Seismic Simulation of Bridges Considering Bending and Torsion Interaction by Yang Yang, University of Hartford
• Seismic Performance of Unreinforced Concrete Railroad Bridge Piers by Qiang Gui, University of Tennessee, Knoxville; and Zhongguo John Ma, University of Tennessee
• Monitoring and Assessment of a Prestressed Concrete Segmental Box-Girder Bridge by Jean-François Laflamme, Bridge Department, Québec Ministry of Transportation; and Marc Savard, Bridge Department, Québec Ministry of Transportation
• Instrumentation, Monitoring, and Load Testing of a 50-Span Large Precast Prestressed Concrete Bridge: The Champlain Bridge by Dominic Lavigne, Jacques-Cartier Champlain Bridge Corporation
• Estimation of the Rebar Strength in Existing Concrete Bridges by Alessandro Fantilli, Politecnico di Torino; and Bernardino Chiaia, Politecnico Di Torino

This is the second session, as a continuation from the session was presented in Las Vegas in Fall 2018. Interest in additive manufacturing (AM) or three-dimensional (3-D) printing is growing tremendously among different ACI committees. The session for Las Vegas was “Materials Science Aspects in Additive Manufacturing of Cementitious Binders” and dealt with fundamental materials science and processing of such systems. The session for Québec City presents challenges and opportunities for scaling of AM of concrete. The session will provide novel information to researchers, engineers, concrete producers, robotic system designers, and contractors to take AM from the lab to the field.

• 3-D Concrete Printing by Selective Deposition—Requirements for Fresh Concrete and Testing by Viktor Mechtcherine, Dresden University of Technology; and Venkagtesh Nerella, Dresden University of Technology
• Opportunities for Customization of Concrete Structures Using 3-D Printing Technology by Jan Olek, Purdue University; Reza Moini, Purdue University; Pablo Zavattieri, Purdue University; and Jeffrey Youngblood, Purdue University
• Mixture Design and Early-Age Mechanical Behaviour of 3D Printable Concrete by Manu Santhanam, Indian Institute of Technology Madras
• Modeling of Extrusion-Based 3D Printing of Cementitious Materials by Narayanan Neithalath, Arizona State University; Gaurav Sant, University of California, Los Angeles; Pu Yang, Arizona State University; and Sooraj Nair, Arizona State University

The main objective of this session is to present results from recent research studies (experimental/numerical/analytical) and field examples. This session will provide a forum for practicing engineers and researchers to share and discuss various issues related to design and construction issues of RC columns under extreme events. This session aims to provide a platform to demonstrate the performance of reinforced concrete columns for buildings or bridges during extreme events such as earthquake, tsunami, vehicular impact, corrosion, high temperature differential, freezing-and-thawing cycles, and ice load impact. Challenges from inspection to design and constructions will be discussed and possible solutions to improve their performance will be debated.

• Composite Action of Circular Concrete-Filled FRP Tube Columns under Lateral Cyclic Load by Ahmed Mohammed Hassan Ali, University of Sherbrooke; and Radhouane Masmoudi, University of Sherbrooke
• Seismic Fragility Analysis of Deteriorating Recycled Aggregate Concrete Bridge Columns Subjected to Freeze-Thaw Cycles by Kaihua Liu, Harbin Institute of Technology; Jiachuan Yan, Harbin Institute of Technology; Chaoying Zou, Harbin Institute of Technology; and Shahria Alam, University of British Columbia
• Effects of Seawater Exposure for One Year on Hollow-Core Fiber-Reinforced Polymer (FRP) Confined Concrete Cylinders Subjected to Severe Environmental Conditions by Song Wang, Missouri University of Science and Technology; and Mohamed ElGawady, Missouri University of Science and Technology
• Effect of High-Strength Reinforcement and Fibers on the Blast Performance of HSC Columns by Hassan Aoude, University of Ottawa
• Comparison of Damage Mechanisms of CFRP-Strengthened Reinforced Concrete Columns Subjected to Blast, Impact, and Quasi-Static Loads by Husham Almansour, National Research Council Canada
• RC Columns Subjected to Reinforcement Corrosion under Sustained Load by Samer Jabbour, Halsall Associates Limited; Beatriz Martín-Pérez, University of Ottawa; and Arnaud Vadeboncoeur, University of Ottawa
• Beam-Column Connection for Concrete Filled FRP Tubes by Ahmed M. Ali, University of Sherbrooke; and Radhouane Masmoudi, University of Sherbrooke

The results of 12 multi-axial compression tests performed on cylinders made of self-consolidating concrete, plain (SCC) and reinforced with steel fibers (FR-SCC), are presented in this paper. In the experimental campaign, four “reference” confining pressures (0, 1, 3 and 10 MPa) were applied on the lateral surface of the specimens. After the first stage of loading, when a hydraulic stress was applied to the cylinders, and progressively increased up to the value of a pre-established confining pressure, a longitudinal compressive load was used to generate crushing of concrete. During this failure, the post-peak behavior of SCC and FR-SCC can be defined by a non-dimensional function that relates the inelastic displacement and the relative stress during softening. Such a function also reveals the ductility of SCC, which increases with the confinement stress and with the fiber volume fraction. By adding 0.9% in volume of steel fibers, FR-SCC can show practically the same ductility measured in unreinforced SCC with 1 MPa of confining pressure. Thus, the presence of an adequate amount of fibers in SCC columns is sufficient to create a sort of distributed confinement.

• Ductility of Fiber-Reinforced Self-Consolidating Concrete under Multi-Axial Compression by Alessandro Fantilli, Politecnico di Torino; and Bernardino Chiaia, Politecnico Di Torino

Deleterious chemical reactions of aggregates in concrete are among the various mechanisms that can conduct to regular or recurring repairs or eventually the replacement of the affected elements/structures. Assessing concrete degradations in structures starts with a reliable diagnosis process performed by a concrete professional. Alkali-aggregate reaction (AAR) or any other aggregate degradation mechanism is a gradual process and determining the current condition and the potential for further damage is rather complex. Testing methods for accurate condition assessment and determination of reaction stage are limited and a deep understanding of the reactions involved and of their impact on the mechanical properties of the affected concrete are crucial in this process. Testing methods for prognosis are generally performed under accelerated laboratory conditions and their correlation with field exposure is often not very accurate. Relatively “new” reactions in concrete such as internal sulfate attack associated with sulfide-bearing aggregates need better understanding and also methods to detect reliably and accurately reactive aggregates. Therefrom, relatively new/upgraded test methods (petrographic and mechanical) for diagnosis of current level of damage due to AAR or other aggregate reactions are presented in this session. Results on the correlation between field exposed concrete blocks and laboratory results for the prevention of AAR are also presented accompanied by new information on the challenges of evaluating the deleterious potential of sulfide-bearing aggregates.

• Challenges in Determining the Deleterious Potential of Sulfide-Bearing Aggregates in Concrete by Josée Duchesne, Laval University; Benoit Fournier, Laval University; Andreia Rodrigues, GHD; Julie Francoeur, Transport Québec; Benoit Durand, IREQ – Hydro-Québec; and Medhat Shehata, Ryerson University
• Mechanical Tools to Assess Damage in Concrete Affected by AAR and Combined Mechanisms by Leandro Sanchez, University of Ottawa
• Outdoor Exposure Site Testing for Preventing Alkali-Aggregate Reactivity in Concrete—A Review by Benoit Fournier, Laval University; Jan Lindgård, SINTEF Building and Infrastructure, Børge Wigum, Heidelberg Cement Northern Europe; and Ingmar Borchers, Verein Deutscher Zementwerke e.V. Forschunginstitut der Zementindustrie

This session examines the latest techniques and technologies for both monitoring and evaluating concrete bridges and bridge elements. This includes both superstructure elements such as bridge decks, barriers, and main spanning girder elements as well as substructure elements including bridge pier bents, piers, and foundations. The session for Québec City deals with innovative techniques for monitoring and evaluating concrete bridges and bridge elements. The session will provide novel information to researchers, engineers, educators, students, and contractors.

• Emerging NDE Methods for Evaluating and Monitoring Bridges by Larry Olson, Olson Engineering, Inc.
• Experimental Dynamic Load Allowance of a Prestressed Concrete Bridge by Eli Hernandez, Missouri University of Science and Technology
• Condition Assessment of Bridges in the United States by Elizabeth Nadelman, Wiss, Janney, Elstner Associates, Inc.; Mohamed ElBatanouny, Wiss, Janney, Elstner Associates, Inc.; Todd Nelson, Wiss, Janney, Elstner Associates, Inc.

During delivery of ready mixed concrete, the slump may change depending on a host of variables. However, the slump is typically known only at the batch plant or job site. This session explains the concepts used for the measurement of several properties (such as workability and volume) of fresh concrete directly in the drum of the concrete truck. Also, the adjustment of slump while in transit is discussed, incorporating experiences of concrete producers that have adopted this new technology. Lastly, researchers will present studies on the economical and practical aspects of slump measurement.

• COMMANDassurance: In-drum Measuring System, an RMX Producer’s Perspective by Bradley Burke, PB Materials
• Environmental and Economical Assessment of an Integrated Probe by Mélodie Hilt, Laval University; and Marc Jolin, Laval University
• In-Drum Measurement Systems by Denis Beaupré, Command Alkon
• In-Transit Concrete Management by Nathan Tregger, GCP Applied Technologies
• Verifi—The Ready Mix View by Kirk Deadrick, ARGOS

Phase change materials (PCMs) have been widely incorporated in building envelops to regulate the indoor temperature. Recent studies have shown that PCMs have other potentials in civil engineering applications, including thermal cracking mitigation in mass concrete, freezing-and-thawing damage control, snow melting, and thermal fatigue retardation. This session will address the efficiency of various stabilization forms of PCMs, the effects of PCMs on concrete properties, and modeling methods. Researchers and engineers considering PCMs as a manner to control temperature change-related problems of concrete should attend. Learn the strategies and details of using PCMs to manage temperature change in concrete.

• How to Integrate Phase Change Materials in Construction Materials by Moncef Nehdi, Western University; and Afshin Marani, Western University
• Microstructure-Guided Numerical Simulation to Evaluate the Influence of Phase Change Materials (PCMs) on the Thermal Response of Concrete Pavements by Sumeru Nayak, University of Rhode Island
• Are Micro-Capsulated Phase Change Materials Efficient for Thermal Energy Management of Concrete Structures? by Yaghoob Farnam, Drexel University; and Mohammad Balapour, Drexel University
• Mitigating Curling of Concrete Pavement by Phase Change Materials: Incorporation, Measurement, and Modeling by Hongyan Ma, Missouri University of Science and Technology; and Wenyu Liao, Missouri University of Science and Technology

In comparison to conventional concrete, high-performance concrete (HPC) and ultra-high-performance concrete (UHPC) are characterized by higher compressive strength and enhanced durability due to their optimized cementitious matrix design. The addition of fiber reinforcement and tailoring the bond properties between matrix and fibers allow for enhanced tensile strength and tensile ductility leading to the concept of ultra-high-performance fiber-reinforced concrete (UHPFRC). Enhanced material properties under tensile loading provide opportunities for innovative and novel structural designs. This session will invite national and international research groups as well as contractors and designers to share their innovations in material tensile strength and tensile ductility of HPC and UHPC, also known as high-performance fiber-reinforced cementitious composites (HPFRCC) or ultra-high-performance fiber-reinforced concrete (UHPRC).

• Results from Pure Shear Test on UHPFRC by Evan Bentz, University of Toronto; Frank Vecchio, University of Toronto; Brittany Yap, University of Toronto; and Stephen Foster, University of New South Wales
• Tensile Behavior of UHPFRC with Nano-Scale Functionalizing Constituents for Structural Applications in Extremely Aggressive Environments Characterized by Chlorides and Acids by Liberato Ferrara, Politecnico di Milano

This session is on state-of-the-art guidelines to conducting a visual condition survey of concrete in service. Attendees will learn of the visual condition survey process, distress features of concrete, as well as in which context they manifest: construction-related defects and distress due to improper placement, finishing, and curing practices; design- and service-related distress due to loading, moisture, and temperature conditions; and durability-related distress due to various mechanisms. Presentations of case studies complemented with nondestructive testing (NDT) techniques are also planned.

• Visual Inspection of Earthquake Affected Structure: A Case Study—Gujarat 2001 by Er. Aniruddha Nakhawa, Structural Engineer Project Consultant
• Utilizing New Technology to Provide Comprehensive Visual Assessment of Cooling Towers and Other Difficult-to-Access Structures by Glenn Schaefer, Structural Technologies
• Visual Condition Survey of an Underground Tunnel Structure Affected by External Sulfate Attack by Julie Ann Hartell, Oklahoma State University

The session will include presentations of case studies that focus on the assessment of concrete structures. The presentations are intended to provide insight into the practical use of the new ACI “364.1R Guide for Assessment of Concrete Structures before Rehabilitation”; and how to use with other new ACI documents that relate to repair of concrete.

• Sampling and Testing of Concrete as Part of an Assessment (ACI 364.1R, Chapter 6) by Benoit Bissonnette, Laval University
• Assessment and Repair of a Precast Parking Deck with Construction Defects by Kyle Stanish, Klein and Hoffman
• Evaluation of Concrete Prior to Rehabilitation by John Lund, Martin/Martin Consulting Engineers
• Evaluation and Assessment of Concrete Prior to Rehabilitation by David VanOcker, CVM

The design of a concrete pavement system for a low traffic volume extends beyond the process of pavement thickness selection; it entails an understanding of the processes and the factors that affect pavement performance. It also encompasses appropriate slab jointing and construction practices that are consistent with local climatic and soil conditions. This session will be for designers, specifiers, and owners of pavement assets. Attendees will learn about the revised ACI report 325.12R, other methods available to design concrete streets, how construction specifications and materials requirements for local roads may differ from highway roads, and maintenance and rehabilitation requirements for low volume roads.

• Tunnels in Paradise by Mark Hirschi, Baldridge & Associates Structural Engineering
• Constructability: Determining the Effectiveness of Curing Concrete by Tyler Ley, Oklahoma State University
• Providing Expectations of Tilt-Wall Surfaces by Anthony DeCarlo, TWC Concrete Services LLC
• How Good is Laser Scanning? byWilliam Paul, BKF Engineers, Inc.
• Accounting for Tolerances within ADA Design Criteria by Peter Ruttura, Ruttura & Sons Construction

The session will present new research, specification changes, and knowledge gained thru experience as it applies to constructing in concrete, and educate members of our industry so they can utilize knowledge to produce a better concrete product.

• Investigating and Characterizing Soils for Use in Local Road Concrete Pavement Design by Brian M. Killingsworth, National Ready Mixed Concrete Association
• Cement Based Pavement Design Methods and Tools for the Practitioner by Eric Ferrebee, American Concrete Pavement Assoc (ACPA)
• Construction and Jointing of Local Concrete Roads: State of the Practice by Amanda Hult, National Ready Mixed Concrete Association
• Concrete Overlays for Streets and Roads by Peter C. Taylor, National Concrete Pavement Technology Center

Recent years have shown the potential vulnerability of concrete bridges to fire and flood hazards. Bridge fires can be caused by crashed or overturned vehicles, arson, accidents or wildfire, while flooding can be due to coastal storm surge or inland riverine and flash events. While provisions for fire and flood safety are requirement for building design, essentially no such requirements exist for concrete bridges. The proposed session will include presentations on topics related to design, performance, mitigation, and strengthening of concrete bridges for such hazards. Academic, industry and agency representatives should attend this session.

• Post-Fire Flexural Testing and Rating of Prestressed Concrete Bridge Girders by Nur Yazdani, University of Texas at Arlington; and Eyosias Beneberu, Bridgefarmer & Associates
• Application of Concrete Spalling Mitigation by Kevin Mueller, Thornton Tomasetti; Stephen M. Stacey, Jensen Hughes; and Anthony F. Bentivegna, Jensen Hughes
• Coastal Bridges Under Hurricane Stresses along the Texas and Louisiana Coast by R. Nasouri, A. Matamoros, F. Testik, A. Montoya, University of Texas at San Antonio

The major challenge to the durability of reinforced concrete structures exposed to chlorides is the corrosion of the carbon steel reinforcement. The current-state-of practice utilizes different strategies to address this problem such as: use of admixtures or supplemental binders in the concrete mixture and increase of cover or surface protection by membranes. Additionally, carbon steel may be coated with epoxy or replaced by more corrosion resistant alloys. The purpose of this hot topic session is to show practitioners, researchers, and students the availability of composite reinforcement that, rather than delaying the corrosion problem, totally resolves it with a material system (i.e., glass fiber reinforced polymer) that is validated, included in standards (i.e., design and materials specs) and readily available.

• Standardization, Guide Development and Long-Term Durability of Fiber Reinforced Polymers (FRP): An Overview of FRP Advancements through ACI Activities by John Myers, Missouri University of Science and Technology
• GFRP Reinforcing: An Engineer’s Perspective by Richard F. Bertz, The Mannik & Smith Group, Inc

The 2016 Kaikoura earthquake in New Zealand resulted in shaking in excess of design level demands for buildings with periods of 1 to 2 seconds at some locations in Wellington. This period range correlated to concrete moment frame buildings of 5 to 15 stories, many of which had been built in Wellington since the early 1980s, and often with precast concrete floor units. Varying degrees of beam hinging and residual beam elongation were observed. Cases of significant beam elongation and associated support beam rotation resulted in damage to precast floor unit supports—in one case leading to loss of support for double-tee units. The deformation demands also resulted in damage to floor diaphragms, especially those with hollow-core floor units. Cracking in floor diaphragms was commonly concentrated in the corners of the buildings. Transverse cracking of hollow-core floor units was identified as a particular concern. Following the earthquake, a guideline was developed for the seismic assessment of existing buildings with precast floors. This presentation will discuss damage from the Kaikoura Earthquake and the implementation of seismic assessment guidelines for buildings with precast floors in New Zealand.

• Damage to Concrete Buildings with Precast Floors during the 2016 Kaikoura Earthquake by Kenneth Elwood, University of Auckland

Construction in the Middle East has many unique challenges. Many areas have extreme high temperatures, low humidity, constant winds, and sulfates in the soils. Areas near the Gulf and Red Seas have corrosion issues from the sea water. This area has had a building boom and is home to some of the tallest buildings in the world. These presentations will discuss how the challenges on construction in the Middle East have been met and how the ACI 318 Code provides the guidance for successful design and construction.

• Special Construction Considerations in the Middle East by Charbel Aoun, Advanced Construction Technology Services (ACTS)
• Overview of Codes and Standards in Saudi Arabia by Ahmed Shuraim

Concrete has become the structural engineers’ material of choice for high-rise construction around the world. The majority of tall buildings constructed today feature either primary structural systems utilizing all reinforced concrete or a composite system utilizing a combination of reinforced concrete and structural steel. Of the current twenty tallest competed buildings in the world, 19 utilize composite or reinforced concrete structural systems; and the only structural steel system on the top 20 list has a completion date prior to 1975. An even better indicator is that of the 20 tallest buildings completed in 2018, all utilized composite or reinforced concrete systems (data as per the Council of Tall Buildings and Urban Habitat, www.ctbuh.org). Reinforced concrete construction has an inherent advantage for tall building design, in that it provides a substantial amount of stiffness, and mass and damping for the structural; three factors that are critical in controlling building motions and accelerations. This session demonstrates the use of reinforced concrete as it pushes to new heights across the globe.

• Recent Supertall Concrete Towers in the Middle East by Robert Sinn and John Peronto, Thornton Tomasetti
• Concrete Pushes Mexico to New Heights by Roberto Stark, Stark & Ortiz, S.C.

The presentations will introduce new techniques in load testing of concrete structures. Such techniques include load testing structures where shear is the expected covering limit state, and where nondestructive testing or monitoring supplements load test results.

• Load Testing of Existing Structures: Case Studies and Lessons Learned by Brian Greve, Wiss, Janney, Elstner Associates, Inc.
• Load Testing – Changes in ACI 318-19 – Integration and Coordination between Committees by Keith Kesner, CVM Engineers
• Load Test of a Precast Concrete Tub Stadium Riser and Bond Testing of #20 Bar by Jeremiah Fasl, Wiss, Janney, Elstner Associates, Inc.
• Load Testing After Strengthening of a Pre-stressed Double Tee Beam that had Failed in Shear by Nestore Galati, Structural Technologies
• Development of Database for Structural Load Tests by Mohamed ElBatanouny, Wiss, Janney, Elstner Associates, Inc.

Professor Hiroshi Mutsuyoshi of Japan Prestressed Concrete Institute is co-moderating a special session focused on the recent advancement of prestressed concrete for bridges and structures using conventional and nonconventional materials. Presentations and technical papers will include the conceptual development of innovative prestressed concrete, laboratory experiments, numerical modeling, and case studies. State-of-the-art prestressing techniques and nonconventional materials such as fiber reinforced polymer (FRP) composites to address the sustainable performance of concrete members will also be considered. The session will benefit practicing engineers, government officials, and academics.

• Pretensioned Bent Caps to Improve Substructure Design and Performance by Anna Birely, Texas A&M University
• Recent Advances in Prestressed Concrete in Korea by Jae-Hoon Lee, Yeungnam University
• On the Application of Basalt-Fiber Reinforced Polymer (BFRP) Bars to Prestressed Slab Elements Typical of the Precast Concrete Industry by Liberato Ferrara, Politecnico di Milano
• Use of Flexible Filler in Post-Tensioned Bridges by Natassia Brenkus, The Ohio State University

Ultra-high-Performance concrete (UHPC) is one of the most promising material innovations in the construction industry in the 21st century. Innovations in material design led to enhanced material properties allowing for innovative and novel structural designs using UHPC. This includes structural elements and structures fully or partially made out of UHPC. National and international research groups and contractors and will share innovations and changes in structural design and performance of UHPC elements. The session has been chosen for the ACI convention in Cincinnati, OH to spread “A River of Knowledge” of advanced structural design utilizing UHPC. Sharing academic knowledge and practical experiences about innovative structural designs using UHPC will facilitate the acceptance and application of the material in U.S. construction.

• Achieving High Strength, Ductility, and Durability in Flexural Members Reinforced with Fiber-Reinforced Polymer Rebars by Using UHP-FRC by Shih Ho Chao, University of Texas at Arlington
• UHPC for Repair of Steel Piles by Mohamed A. ElGawady, Missouri S&T
• Reinforcement Anchorage and Bond – Slip Laws for UHPC Structures by Stavroula J. Pantazopoulou, York University, Canada; Konstantinos Tsiotsias, York University; and Katerina D. Papoulia, University of Waterloo
• Effect of Fiber Reinforcement on the Tensile Behavior of Rebar Reinforced UHPC by Kay Wille, University of Connecticut

The requirements for achieving sufficient modulus of elasticity (MOE) of concrete is increasing not only for high-rise structures, but also for concrete precast/prestressed components and repair application. However, achieving high modulus of elasticity, while maintaining good workability, pumpability, and consolidation of concrete is of challenge for concrete producers and contractors. Key factors affecting MOE include mixture design, rheological properties, and construction practices also influence in-place MOE and its homogeneity. Testing of MOE of high-performance concrete also requires special attentions to achieve reliable data. The session will be beneficial for engineers, specifiers, concrete producers, contractors, and academic communities.

• A Tall Building Engineer’s Perspective on Specifying Modulus of Elasticity by Robert C. Sinn, Thornton Tomasetti Inc.
• An Overview of Factors Influencing on Concrete Modulus of Elasticity by Van K. Bui, BASF Construction Chemicals
• Producing High-Modulus-of-Elasticity Concrete—Meeting Specification and Contractor Expectations by Nicholas J. Beristain, Votorantim Cimentos
• Testing the Limits of Concrete Modulus of Elasticity in Chicago by Walter H. Flood IV, Flood Testing Labs Inc.
• Uncoupling Modulus of Elasticity and Strength—Effect of Small Addition of Carbon Nanotubes on Concrete Properties by Surendra P. Shah, Northwestern University

The presentation will address construction, forming, mixture design, transportation, and engineering challenges faced in extreme conditions.

• Hidden Peak Snowbird Resort by Jon Brinkerhoff, Layton Construction; and Sam Koceja, Altaview Concrete

Self-consolidating concrete (SCC) is known to be more sensitive to changes in constituent elements, mixture design, and mixing procedure, which can have significant consequences on placement. Especially controlling the water content, including the moisture content of the sand, is a challenge, limiting the practical implementation of SCC. This session will reveal different strategies to control the variation in fresh properties, making the session suitable to material producers, contractors, engineers, owners, and academics. This session, participants will be informed on: variations in concrete constituents, mixture design, mixing, transportation, and placement procedures influencing fresh SCC properties; which countermeasures can be taken to control these variations; the importance of an adequate quality control system for the successful implementation of SCC; and future perspectives in actively controlling fresh SCC properties.

• The Perfect SCC Project by G. Terry Harris, GCP Applied Technologies
• Monitoring SCC Performance During Production and Determining Adjustments by Joseph A. Daczko, BASF Corporation
• Robustness of Self-Consolidating Concrete Incorporating Different Viscosity-Enhancing Admixtures by Kamal H. Khayat, Missouri University of Science and Technology
• Breaking the Ice: Controlling SCC in Hot Weather by Lloyd Keller, EllisDon Corporation; and Stacia Van Zetten, EllisDon Corporation

During the past 3 years, ACI Committee 544 has developed five new documents addressing the testing and fresh concrete properties, mechanical properties, back calculation of tensile properties, structural design with fiber-reinforced concrete (FRC), design of elevated slabs with FRC, and design of precast tunnel lining with FRC. These published reports (ACI 544.6R, 544.7R, 544.8R, 544.9R, and 544.3R) are currently available for the engineering community and offer a completely fresh way to use, design, and implement FRC in a variety of applications. The purpose of this course is to dedicate a presentation to each document addressing its content, how the specific topics of documents interact with each other, as well ways to implement and incorporate the knowledge in these documents in the design and specification. The speakers are the members of the committee who were the primary authors of the documents.

• An Overview of the Document ACI 544.6R-15: Report on Design and Construction of Steel Fiber-Reinforced Concrete Elevated Slabs by Xavier Destree, Xavier Destree Ltd. .
• An Overview of the Document ACI 544.7R-16: Report on Design and Construction of Fiber-Reinforced Precast Concrete Tunnel Segments by Mehdi Bakhshi, AECOM

ACI Committee 370 and ACI Subcommittee 440-F are jointly developing the standard “Blast Design Guidelines for Externally Bonded FRP Applications” to provide guidance for designing concrete and masonry wall panels with an application of fiber-reinforced polymer (FRP) that are subject to blast loading. The opening presentations in this two-part session will provide an overview of the proposed standard, while covering some basic blast design practices and introducing the underlying single-degree-of-freedom (SDOF) analysis methodology. Subsequent presentations will discuss alternate slab analysis approaches, as well as FRPs used as column reinforcement, catching systems, and anchors within a blast- and/or impact resistant design. Focused talks on FRP detailing and FRP manufacturers’ insights will also be presented.

• Design of FRP Catcher Systems for Blast Loads by John E. Crawford, Karagozian & Case, Inc.
• Advanced Modeling of Blast Response of Reinforced Concrete Walls with and without FRP Retrofit by Tarek H. Kewaisy, Louis Berger; and Ahmed Khalil, Applied Science International, LLC
• CFRP Retrofit of Concrete Columns by Alan Lloyd, University of New Brunswick
• A Practical Perspective on the Use of Advanced Composites for Blast Mitigation by Scott Arnold, Fyfe Co. LLC

Chemical admixtures is one of the fastest growing and innovative areas of concrete construction currently. This session will highlight new admixture technology and how these new admixtures bring value to concrete by improving plastic and hardened properties, providing improved economy, and changing the limits on how concrete can be used as a constructible material. Attendees will be provided with knowledge about chemical admixtures and how and where to use them effectively.

• Introduction to What’s New in Chemical Admixtures by Kari L. Yuers, Kryton International Inc.
• A Chemical Admixture with Carbon Nanotubes by Yuan Gao, Northwestern University; David J. Corr, Northwestern University; and Maria S. Konsta-Gdoutos, Northwestern University
• Use of Polymeric Microspheres for Providing Resistance to Freeze-Thaw and Salt Scaling by Michael D. A. Thomas, University of New Brunswick; and Edward G. Moffatt, University of New Brunswick
• New Generation of High-Range Water Reducers by Suzanne Lianopoulos, BASF; and Thomas M. Vickers, BASF
• A New Generation of Micro-Particulate-Based Admixtures for Concrete by Christopher John Eagon, BASF; and Paul Horst Seiler, BASF Corp.

The importance of quality and quality standards include reference to ISO 9001. Beyond the technical aspects, the practice of quality management is about people, relationships, and processes that can have a huge impact on results. Where does one find this type of content, and who will be so bold as to start this discussion? These topics are discussed in many committee meetings where of the most passionate debates revolve around them and how industry stakeholders work together. The concrete industry will benefit from a healthy discussion in a public forum on QMS implementation. The hosting of various speakers, topics, and perspectives will help to engage subject matter experts, highlight practices, and impact other committee documents.

• Quality Control of Silica Fume Concrete Bridge Decks by Thomas G. Tyler, Skanska USA Civil Northeast

The main objective of this session is to provide an overview of methodologies for rating existing concrete bridge components including bridge deck, superstructure, and substructure, using both LRFR and LFR approaches. Presentations will include case studies of load rating concrete bridges with various structural configurations such as typical prestressed I-girders, reinforced and prestressed multi-cell box girder bridges, segmental concrete bridges, bridges with large horizontal curvatures and complex geometry (for example, concrete arch and rigid frame bridges), and bridges with insufficient plans or details. Presentations will also emphasize relevant refined analysis methods that extend beyond traditional AASHTO rating methods such as finite element modeling, grillage modeling and diagnostic load testing. This session will be of interest to bridge owners, operators, design engineers, and researchers.

• Load-Rating Strategies for Bridges with Limited or Missing As-Built Information by Mehrdad Dizaji, University of Virginia; Mohamad Alipour Tabrizi, University of Virginia; Devin K. Harris, University of Virginia; and Osman Eser Ozbulut, University of Virginia
• Condition Assessment and Load Rating for a Cracked Widened Bridge by Nestor R. Rubiano, HNTB Corporation
• Load Testing: Not Just for the Big Bad Bridges by Andrew J. Foden, WSP USA; and Zachary James Van Brunt, WSP USA
• Load Rating of 87-Year-Old Reinforced Concrete Tee Beam Bridge by Farhad D. Panthaki, TranSystems Corporation

This session is a concrete repair session to honor the contributions of Tony Murray (who passed in 2016) to ACI and the concrete repair community. Tony was Chair of ACI Committees 503, 546, and 563, and a member of CLC, TAC, 364, 503, 546, 562, 563, and TRRC. He was a Fellow of ACI and speaker over many years at ACI concrete repair seminars. He was also an engineer, materials expert, and owned a structural concrete repair construction company. The session will include speakers from the concrete repair and materials community and the topics that reflect Tony’s wide range of knowledge in concrete repair and materials.

• Structural Concrete Repairs: Engineering Principals and Everyday Best Practice by Bruce A. Collins, Restruction Corporation
• Structural Repairs Using Preplaced Aggregate Concrete by John S. Lund, Martin/Martin, Inc.
• Lessons Learned from a Master in Concrete Repair (Tony Murray) by Gene R. Stevens, JR Harris & Co Structural Engineers; and Jim Harris, JR Harris & Co Structural Engineers
• Post-Tensioning Repairs and Modifications by Pete Barlow, Contech Services, Inc.
• Reinforcement Corrosion, No Perfect Solution by Fred R. Goodwin, BASF

Bridges are essential components of transportation systems. The failure and damage of bridges not only affects its immediate users, but also brings serious aftermath to earthquake events. With the increase in transportation demand and more stringent seismic performance requirements, bridge retrofit and repair is an important task for engineers and researchers. Bridge retrofits usually involve functional upgrades (such as deck widening) and seismic upgrades (such as strengthening seismic load path). The effects of the two upgrades are usually coupled and need to be analyzed. Many of the existing bridges do not meet the requirements in current design codes and thus cannot be analyzed using standard methods. Therefore, more sophisticated analysis and customized solution are needed. While providing structural upgrade solutions to seismic issues, engineers also need to reduce the interruption to the traffic as much as possible. Development and implementation of innovative retrofit and repair methods are expected to upgrade deficient bridges to current standards and minimize traffic interruption. The main objective of this session is to present results from recent research studies (experimental/numerical/analytical) and practical examples of existing bridge retrofit and repair. This session will provide a forum for practicing engineers and researchers to share and discuss the various issues related to design and construction issues of existing bridges.

• Rehabilitation of Longitudinal Joints of Double-Tee Bridges by Lucas M. Bohn, South Dakota State University; Mostafa Tazarv, South Dakota State University; and Nadim I. Wehbe, South Dakota State University
• Rapid Repair of Hollow-Core FRP-Concrete-Steel Columns by Mohamed A. ElGawady, Missouri University of Science and Technology; Ahmed Gheni, Missouri University of Science and Technology; and Sujith Anumolu, Missouri University of Science and Technology
• Fragility Analysis of Retrofitted Multi-Column Bridge Bent Subjected to Near Fault and Far Field Ground Motion by Abu Hena Billah, University of British Columbia; and Shahria Alam, University of British Columbia
• Seismic Repairing of a Seismically Damaged Bridge Column with Low-Grade GFRP Material by M. Shahria Alam, University of British Columbia

Settlement of concrete is a phenomenon that takes place during the early hours after concrete is cast. This can be a problem in structures having top bars where the settlement of the fresh concrete around the reinforcement can cause cracking and/or a weak plane right above the reinforcement. This session includes presentations providing explanations from research studies and actual projects on the topic of concrete settlement, tests methods developed to measure this phenomenon, and techniques available to reduce it.

• Settlement of Fresh Concrete: Using Neutron Radiography to Quantify the Influence of Mixture Proportions by Mehdi Khanzadeh Moradllo, Oregon State University; and W. Jason Weiss, Oregon State University
• Surface Settlement of SCC—How Critical is it on Concrete Performance? by Kamal H. Khayat, Missouri University of Science and Technology
• Dealing with Plastic Settlement Cracking: Case Studies and Lessons Learned by Oscar R. Antommattei, Kiewit Engineering Group
• How to Reduce Settlement Cracking in Reinforced Concrete by Muzai Feng, University of Kansas; Rouzbeh Khajehdehi, University of Kansas; David Darwin, University of Kansas; and Eman Khalid Ibrahim, University of Kansas

Cracking is often considered detrimental to the corrosion resistance of reinforced concrete structures, but the magnitude of this effect is less clear. Crack size, location, and depth all may affect the impact of cracking on corrosion, and there is debate as to whether small cracks are detrimental to corrosion resistance. Presentations will highlight recent research into the effect of cracking on corrosion resistance of concrete and the effectiveness of crack mitigation/repair. This session will be of interest to contractors, engineers, and owners who wish to learn how cracking can impact the service life of structures they design, build, and use.

• Chloride Ingress at Cracks by Neal S. Berke, Tourney Consulting Group, LLC
• Influence of Cracks on Corrosion Initiation of Corrosion Resistant Reinforcement by Soundar Sriram G. Balakumaran, Virginia Department of Transportation; Michael C. Brown, WSP USA; and Richard E. Weyers, Associated Materials Engineers
• Effect of Early-Age Cracking on Corrosion Initiation in Reinforced Concrete by James D. Lafikes, University of Kansas; David Darwin, University of Kansas; Matthew O’Reilly, University of Kansas; and Omid Farshadfar, Thornton Tomasetti
• Performance of Cracked High-Performance Concrete in a Harsh Marine Environment by Edward G. Moffatt, University of New Brunswick; Andrew Fahim, University of New Brunswick; and Herwing Lopez-Calvo, University of New Brunswick
• Effect of Cracking on Reinforced Concrete Corrosion by Brian M. Pailes, Rutgers University

This session will provide ACI members an overview of research performed through private and industry funding over the last decade. Presentations will highlight full-scale, high-explosive and shock tube test programs, analysis methodologies, and design response limits. This session is appropriate for researchers, practitioners, and students.

• Testing and Analysis of Precast Concrete Wall Panels by Marlon Bazan, Protection Engineering Consultants; and Charles Oswald, Protection Engineering Consultants
• Open-Air Blast Testing of Large Prestressed Concrete Slabs by Jason Florek, Stone Security Engineering
• Unified Performance-Based Blast-Resistant Design Methodology for Precast Concrete Insulated Wall Panels by Matthew Gombeda, Lehigh University; Clay Naito, Lehigh University; and Spencer Quiel, Lehigh University
• Blast Response Limits for Load-Bearing Prestressed Concrete Panels by Thomas Mander, University of Texas at San Antonio
• Effect of High Strain Rates of Reinforced Concrete Bond by Eric Jacques, Virginia Polytechnic Institute and State University

This session presents constructability review perspectives from the different parties: design professionals, construction managers, concrete contractors, and ready mix producers. All industry professionals should attend to learn how each party views their responsibility for a constructability review and how that interacts with the other parties’ constructability review.

• An Introduction and Overview to ACI 134 Constructability Committee by Jim Cornell, JN Cornell Associates LLC
• What is Constructability? by John Hausfeld, Baker Concrete Construction Inc.
• Use of Heavy Equipment on Existing Bridges during Constructionby Kyle Eyre, Kiewit
• Constructability of Elevating Concrete Slabs on Grade by Anthony Lamanna, Arizona State University
• When Structural Concrete is Architectural Concrete by Kevin MacDonald, Beton Consulting Engineers LLC
• 403 N Wabash—Innovative Tower Crane Support Scheme for a Challenging Urban Site by Eamonn Connolly, James McHugh Construction Co.

This session, includes presentations of historical aspects of concrete and concrete construction practice. Attendees will gain a greater understanding and appreciation of the development of the concrete industry.

• How Did North America’s First Portland Cement Concrete End Up in Halifax Harbour? by Sean Monkman, CarbonCure Technologies Inc.
• CSI of Girl Encased in Concrete by Megan Huberty, American Engineering Testing
• Who is Carl Menzel? by Anne Werner, Southern Illinois University Edwardsville
• History of the Hard Hat by Luke Snell, Western Technologies

The ASTM C94 90-minute time limitation has been around for over 80 years and committee members are now discussing its removal! The committee is now reviewing current science and modern design techniques for concrete mixtures by considering the time limit to be determined by the specifier and/or ready mix producer. This session will explain why this proposed change is being debated and give examples of scenarios showing expanded time limits of 2 or more hours. We’ll show how the pot-life of concrete can be extended without harm and why the typical 90-minute limit has become an antiquated standard. Examples of successful projects will illustrate the capabilities possible where longer time limits have been implemented.

• 90 Minutes: Love It or Lose It? by G. Terry Harris, GCP Applied Technologies
• Evaluation of the 90-Minute Rule as an Acceptance Criteria by Mohamed Mahgoub, New Jersey Institute of Technology; and Wayne Rawlins, New Jersey Institute of Technology
• Extending Concrete Slump Life: ProvenTechnologies and Projects with Challenging Placements by Mark Bury, BASF Admixtures Inc.

Over the past 30 years, concrete repair professionals have recognized a need to improve the performance of concrete repair practice. Various references indicate that approximately 50% of concrete repairs fail within a period of 10 years. The premature failure of concrete repairs creates a series of problems, including:

• Safety risks associated with potential falling debris hazards
• Risks associated with unsafe structures
• Costs in the billions of dollars associated with the repair and re-repair of concrete structures

The concrete industry has developed several new standards and codes specifically to improve the design side of concrete repair practice. These include ACI 562, Concrete Repair Code; ACI 563, Concrete Repair Specifications; and ACI 437.2, Standard for Load Testing of Existing Concrete Structures. While the ACI 562 code is gaining acceptance at the state level, it has not been adopted into the International Existing Building Code, largely because of resistance from some anti-code design professionals. The hot topic session will aim to explore five viewpoints on how to improve concrete repair practice from the perspective of design professionals, contractors, and academics.

• It Is All on the Contractors by Carl Larosche, Wiss, Janney, Elstner Associates, Inc
• It Is All About Academic Instruction by Lawrence Kahn, Georgia Institute of Technology School of Civil and Environmental Engineering
• Adoption of ACI 562 into IBC/IEBC by Keith Kesner, CVM Professional
• Unifying ACI 318 and ACI 562 into One Code, “ACI 880” by Tracy Marcotte, CVM Professional

The field of digital manufacturing (3-D printing) of concrete is rapidly evolving. An understanding of material properties and processing related parameters, and how they influence the properties of three-dimensional (3-D) printed structural components, is essential to ensure further advances in this nascent field. The proposed sessions will provide new information on selection of binder materials and combinations for successful 3-D printing; rheological characterization of cementitious materials as applied to digital manufacturing; the role of interfaces in the plastic and hardened stages; and microstructural architectures achievable by digital manufacturing to enable novel, multi-functional cementitious composites with special properties. This session will be valuable for researchers and students, and industrial entities interested in digital manufacturing and material processing.

• Rheological Control of 3D Printable Cement Paste and Mortars by Scott Jones, National Institute of Standards and Technology; Dale Bentz, National Institute of Standards and Technology; Nicos Martys, National Institute of Standards and Technology; and William George, National Institute of Standards and Technology
• How the Rigidity-To-Thixotropy Transition in Rheology Affects the Shape Stability of Dense Suspensions? by Iman Mehdipour, University of California, Los Angeles; Gaurav Sant, University of California, Los Angeles; H. Atahan (ITU); and N. Neithalath (ASU)
• Mechanical Response and Micro-CT Characterization of 3D Printed Cement Paste Elements with Controlled Architecture by Jan Olek, Purdue University; Mohamadreza Moini, Purdue University; Pablo Zavattieri, Purdue University; and Jeffrey Youngblood, Purdue University
• Microstructural Packing, Rheology, and Ram Extrusion Characteristics of 3-D-Printable Cementitious Binders by Sooraj Nair, Arizona State University; Aashay Arora, Arizona State University; Hussam Alghamdi, Arizona State University; and Narayanan Neithalath, Arizona State University
• Approaches to Producing Additively Manufactured Concrete Mixtures by Raissa Ferron, University of Texas at Austin

This session will present the latest advances in seismic rehabilitation of existing concrete buildings that have come out of recent research projects and experiences from recent earthquakes around the world. The session will present results of evaluation studies applied to existing structures using current ASCE 41, ACI 369.1R-17, or other local seismic evaluation and retrofit standards. Attendees will also be presented with information on recent research results of laboratory experiments of retrofitted structural components. An overview of ongoing activities within ACI 369 to update the ACI 369.117 standard will also be presented.

• Guidance on Nonlinear Modeling of RC Buildings by Laura Lowes, University of Washington
• Overview of the NIST-ATC Project on Benchmarking of Evaluation Methodologies for Existing Buildings by Siamak Sattar, National Institute of Standards and Technology
• Evaluation of Seismic Assessment Procedures for Existing Reinforced Concrete Structures Damaged in the 2016 Meinong Earthquake by Laura Lowes, University of Washington; Dawn Lehman, University of Washington; and J. Sumearil, University of Washington
• ASCE 41 versus TEASPA: Comparison of Seismic Evaluation Results of RC Frame Buildings Damaged During 2016 Meinong Earthquake, Taiwan by Jiun-Wei Lai, University of California, Berkeley; ShyhJiann Hwang, National Taiwan University; Insung Kim, Degenkolb Engineers; Daniel Zepeda, Degenkolb Engineers; Garrett Hagen, Degenkolb Engineers; and Kirk Johnston, Degenkolb Engineers
• Performance of a Nonductile RC Building for the FEMA P695 Far-Fault Ground Motion Data Set, by Adolfo Matamoros, University of Texas at San Antonio; Andres Lepage, University of Kansas; Anil Suwal, University of Texas at San Antonio
• Ongoing Activities for Future Updates of the ACI Standard 369.1-17 by Insung Kim, Degenkolb Engineers; Sergio Brena, University of Massachusetts; Adolfo Matamoros, University of Texas at San Antonio; Garrett Hagen, Degenkolb Engineers; and Arne Halterman, Holmes Culley
• Quantifying Benefits of Seismic Retrofitting Gravity Columns Using CFRP Jackets Based on Nonlinear Modeling Parameters per ACI 369.1 by Saeed Fathali, Structural Technologies; Bill Graft, ImageCat; and Mohammad Jalalpour, Structural Technologies
• Seismic Evaluation of Beam-Column Assemblages Strengthened with FRP and Anchored with Spike Anchors by Elias Saqan, American University in Dubai; Hayder Rasheed, Kansas State University; and Tarek Alkhrdaji, Structural Technologies
• Seismic Performance of Repaired Lightly Reinforced Concrete Walls by Christopher Motter, Washington State University
• Repaired Reinforced Concrete Wall Buildings in Chile after 2010 Earthquake by Matias Hube, Pontifical Catholic University of Chile
• Residual Capacity of Damaged and Epoxy-Repaired Reinforced Concrete Plastic Hinges by Kai Marder, University of Auckland; Kenneth Elwood, University of Auckland; Christopher Motter, Washington State University

In developing 563, topics emerged for which the industry does not have consensus, or for scope that is currently under study and is not ready for standardization. A round table discussion of repair trends and new work needed in the future will be convened by the incoming chair of 563, with input from the session speakers.

• What the Future Might Hold for 563 by John Lund, Martin / Martin Inc.

The use of self-consolidating concrete (SCC) can contribute to increased productivity, an improved working environment, and improved concrete mechanical behavior and durability. However, use of SCC is still generally low, mainly due to the high cost associated with the high cement content and admixtures. The effective reduction of cement and cementitious materials contents in SCC mixtures will reduce cost and also minimize environmental impact. Among other benefits of reduced cement content leading to reduced paste content is reduced concrete shrinkage and thereby reduced risk for crack formation. This section includes presentations on the benefits, design, and performance of SCC with low cementitious materials content.

• Particle Packing and Mixture Design Approach for Eco-SCC by Kamal Khayat, Missouri S&T; Olafur Wallevik, Innovation Center Iceland; and Behrouz Esmaeilkhanian, Beton Provincial Ltee
• Sustainable Self-Consolidating Concrete: Utilization of Limestone Powders by Natalia Cardelino, Mercer University; Kimberly Kurtis, Georgia Institute of Technology; and Russell Gentry, Georgia Institute of Technology
• The Rheology of Control Flow Concrete by G. Terry Harris, GCP Applied Technologies; Klaus Alexander Rieder, GCP Applied Technologies; Elizabeth Burns, GCP Applied Technologies; Joshua Curto, GCP Applied Technologies; and N. Tregger, GCP Applied Technologies
• Eco-Efficient Self-Consolidating Concrete (Eco-SCC) with Low Powder Content and Recycled Concrete Aggregate by Jiong Hu, University of Nebraska–Lincoln

ACI 130’s Sustainability of Concrete Materials book will have been approved and published by the time of the Las Vegas convention. Therefore, this session will introduce the ACI community to this new publication.

• Achieving Sustainability and Resiliency in the Built Environment Through the Use of Blended Cements by Julie Buffenbarger, Beton Consulting Engineers
• Natural Pozzolans as Sustainable Supplementary Cementitious Materials by Raissa Ferron, University of Texas at Austin
• Reducing Clinker Content and Carbon Footprint of Concrete Using SCMs, Limestone Cement, and Optimized Aggregate Gradations by R. Doug Hooton, University of Toronto
• Achieving Sustainability by Use of Alternative Cements by Mary Christiansen, University of Minnesota Duluth

Fly ash has become a strategic material for solving concrete durability challenges and making concrete construction more resilient and sustainable. Fly ash quality can be improved through various processing techniques. To meet market demand for quality and quantity, beneficiation is an increasing necessity. In addition, reclaiming fly ash from disposal in landfills and ponds is becoming more common and often requires beneficiation. This session will present the most widely used technologies in the market today. This session will be of great value to specifiers, engineering consultants, contractors, and material suppliers.

• Georgetown, SC: A Reclaiming Success Story by Hank Keiper, The SEFA Group
• What Problem Am I Fixing? by Craig Plunk, Boral Construction Materials

This series of sessions, co-organized by fib, serves as an interim to the Bond in Concrete conference series, held in Europe every 10 years. Various presentations will highlight the following information: 1) important changes required to development and lap splice provisions for reinforcement; 2) new works and developments as related to the modelling of bond between reinforcing steel and concrete; and 3) the results of recent experimental studies relating to lap splicing of straight bars.

• Assessing Historical Provisions for the Bond of Plain Bars by Lisa R. Feldman, University of Saskatchewan; and John Cairns, Heriot-Watt University
• Development Length of Straight Bars in Tension Using High-Strength Materials by Samir Yasso, University of Kansas; and Remy D. Lequesne, Andres Lepage, David Darwin, and Matthew O’Reilly, University of Kansas
• Proposed Code Provisions for Anchoring Reinforcing Bars with Standard Hooks and Heads by David Darwin, University of Kansas; and Matthew O’Reilly, Giuseppe Centonze, Krishna P. Ghimire, and Yun Shao, University of Kansas

Various experts will share their experience in implementing performance-based specifications in projects. Projects will cover a broad range of applications. The focus will be on lessons learned and how someone can implement a successful performance-based specification.

• Performance Specification Compliance for Design-Build and P3 Projects by Neal S. Berke, Tourney Consulting Group
• Development and Execution of a Performance Specification for Mass Concrete in a Transit Station by R. Doug Hooton, University of Toronto; and John A. Bickley, John A. Bickley Associates
• VDOT’s Experience with Performance Specifications by Michael Sprinkel, Virginia Transportation Research Council
• Implementation of Performance Specifications for Concrete at the Illinois Tollway by Daniel J. Gancarz, Applied Research Associates
• Case Study Using Performance-Based Criteria for SCC Coastal Condominium Column Repair by David G. Tepke, SKA Consulting Engineers Incorporated
• The Christopher S. Bond Bridge—An Icon for Kansas City by Karthik Obla, National Ready Mixed Concrete Association
• The Port Authority of New York & New Jersey’s Experiences with Performance Specifications by Casimir J. Bognacki, The Port Authority of New York & New Jersey
• Performance-Based Specifications – State of the Industry by Colin Lobo, NRMCA

The presentations in this session will emphasize the durability of concrete bridges and buildings subjected to aggressive environmental or physical distress. Presentations will encompass a variety of technical aspects, such as the residual behavior of concrete members, performance of concrete structures reinforced or strengthened with fiber-reinforced polymer composites, and damage detection and assessment techniques. Both experimental and analytical investigations are of interest. The session brings to light recent research findings and provides an opportunity to discuss present challenges and technical demands. Critical information is given to those who lead tomorrow’s structural design and construction, including practicing engineers, government officials, and academics.

• Australian Developments in Concrete Durability Consultancy by David Millar, Building and Construction Research and Consulting
• Behavior of Prestressed Concrete Beams with CFRP Strands by Franz N. Rad, Portland State University; and Yasir M. Saeed, Portland State University
• ASR Damage Detection and Assessment of Supplementary Cementitious Materials Subjected to Environmental Loadings by Shuaicheng Guo, Michigan Technological University; and Qingli Dai, Michigan Technological University
• Microscopic Cracking of ASR-Affected Fiber-Reinforced Concrete by Bishnu P. Gautam, University of Toronto; and Daman K. Panesar, University of Toronto
• Durability of SEACON: Concrete Made with Sea Water and Salt-Contaminated Aggregate by Morteza Khatib, University of Miami; F. De Caso and Antonio Nanni, University of Miami
• Long-Term Durability of GFRP Internal Reinforcement in Concrete Structures by Omid Gooranorimi, University of Miami; John J. Myers, Missouri S&T; Doug D. Gremel, Hughes Brothers; and Antonio Nanni, University of Miami
• Behavior of Concrete Beams with Corroded Reinforcement Retrofitted with CFRP by Franz N. Rad, Portland State University; and Needa Lingga, Portland State University

Non-combustibility, fire resistance, and resiliency have always been inherent properties of concrete and masonry construction. Because of these properties, concrete and masonry construction were preferred building materials in many applications, including multi-family housing and high-rise construction. Recent trends, both in the United States and internationally, have put these applications at risk to various types of light frame and mass timber construction. Throughout the world, there has been a push for larger and higher light frame construction, and with that, significant risks related to the vulnerability of these structures to fires. It is expected the upcoming code development cycle for the International Building Code (IBC) will see continued efforts to provide more applications for light frame and mass timber construction, into applications where concrete and masonry construction have been used. With this IBC development cycle starting in early 2018, this session is important and timely to review current code provisions, anticipate threats, review the situation internationally, and provide avenues for the concrete and masonry industry to combat these threats.

• Strategies for Enhancing Fire Resistance and Resiliency of Modern of Concrete Structures by Venkatesh Kumar R. Kodur, Michigan State University
• Resilience of Structure Related to Fire by Stephen S. Szoke, American Concrete Institute
• Historical Evolution of Buildings and Fire Resistance in U.S. Codes by Stephen V. Skalko, P.E. & Associates

Learn about emerging trends in the metallurgy of high-strength (HS) steel reinforcement, design considerations, current research focusing on ductile and non-ductile behavior of concrete structures reinforced with HS, and proposed ACI Subcommittee.

• Metallurgy of High Strength—Emerging Trends by Jacob Selzer, Commercial Metals Corporation
• State of Practice and Design Considerations by David Fields, Magnusson Kemencic Associates
• Proposed ACI 318 Code Provisions for High Strength by Dominic Kelly, Simpson Gumpertz & Heger
• Advances in High-Strength Reinforcing Bars in the U.S. by Wassim Ghannoum, University of Texas at San Antonio

The main objective of the session is to publicize and present the recently published new ACI 506 “Guide to Shotcrete” (published in July 2016) and demonstrate how it is now in sync with our specification document (ACI 502.6-13). The attendees’ outcome is a better knowledge of the recent (and most importantly shotcrete-related) ACI documents (Guide + Spec) and how to navigate them, as well as state-of-the-art news on technical shotcrete developments. Following this main theme for the session, the attendees will also learn of the detailed differences between shotcrete and concrete (both technically and contractually) and receive clear directive on selecting the dry or the wet process for a given job. Moreover, two selected technical presentations will bring forward the most recent development and research on the effect of bond quality on reinforcement development length and on the control of rheology to further improve inplace strength and durability.

• The Fundamental Approach of Shotcrete Application for an Adequate Structural Use by Pasquale Basso Trujillo, Laval University; Bruno Massicotte, Ecole Polytechnique Montreal; and Marc Jolin and Benoit Bissonnette, Laval University

Contractors, Specifiers, Concrete Producers and Concrete Testing Agencies will be able to better understand the impact of time, temperature and drum revolutions on the performance of ready-mix concrete during production and placement of concrete during hot weather.

• Hot Weather Concreting in Florida—The 14/Selmon Expressway Connector by G. Terry Harris Sr, GCP Applied Technologies; Raymond O. Fox, GCP Applied Technologies; and David Westcott, Cemex, Inc.
• Hot Weather Concreting in South Louisiana: Project Profile by TJ Harris, Ascension Ready Mix

Ultra-high-performance concrete (UHPC) is seen as an influential material innovation in the construction industry in the twenty first century. Many research groups overseas as well as in the United States have studied the material and structural behavior in the last two decades. One of the most critical challenges is finding innovative approaches in material design, quality control, and structural performance to strengthen the broad application of this material. UHPC is a preferable construction material of the twenty-first century due to its excellent strength, durability, ductility, and energy dissipation capacity. The session will invite national and international research groups, material suppliers, and contractors to share their knowledge in innovations for broad application. This session fits naturally into the theme “Driving Concrete Technology.”

• Exterior Ultra-High-Performance Concrete Thin Wall Cladding Panels & Building Code Compliance by Mahmut Ekenel, ICC Evaluation Service
• Study on the Field Thermal Curing of Ultra-High-Performance Concrete Employing Heat of Hydration by Amirpasha Peyvandi, Stantec Inc.
• Seismic Design and Performance of UHPC Bridge Bents by Mohamed Moustafa, University of Nevada, Reno; and Christopher Joe, University of Nevada, Reno
• UHPC Application in Cladding Panels by Luke R. Pinkerton, Polytorx
• Latex-Modified UHPC for Innovative Strengthening Technique of RC Beams by Moneeb Genedy, University of New Mexico; and Mahmoud M. Reda Taha, University of New Mexico
• The Challenges and Solutions of Utilizing a Fluid UHPFRC for Large Pours by William T. Kulish, Kulish Design Company & The Steelike Concrete System

This session, co-organized with RILEM (Technical Committee DFC: Digital fabrication with cement-based materials and RILEM 266-MRP – Measuring Rheological Properties of Cement-Based Materials) seeks to present the latest developments on the topic of 3-D printing of concrete. This new frontier in building materials technology investigates methods and materials that will allow concrete to be made rapidly, at a lower cost, in unique designs and without formwork. This revolutionary idea exists at an intersection between concrete materials science and advanced processing technologies.

• Digital Concrete at ETH Zurich by Timothy Wangler, ETH Zurich; and Ena Lloret, Norman Hack, and Lex Reiter, ETH Zurich
• 3-D Printing Concrete—Workability and Rheology by Mohammed Sonebi, Queen’s University Belfast; Sofiane Amziane, Blaise Pascal University; Damien Rangeard, National Institute of Applied Sciences; and Arnaud Perrot, Universite de Bretagne-Sud
• Performance-based Laboratory Testing of Cementitious Materials for Construction-Scale 3-D Printing by Ali Kazemian, University of Southern California; and Xiao Yuan, Department of Industrial and Systems Engineering

This international symposium attracts interest from researchers, practitioners, and manufacturers involved in the use of fiber-reinforced polymers (FRPs) as reinforcement for concrete structures. This includes the use of FRP reinforcement in new construction and FRP for strengthening and rehabilitation of existing structures.

• Characteristics of FRP Pretensioned Concrete Beams after Long-Term Exposure by Hirofumi Watanabe, Kawada Construction Company, Ltd.; Hiroshi Nakai, Maeda Kohsen Co., Ltd; and Tsuyoshi Enomoto, Tokyo Rope Company, Ltd.; and Taketo Uomoto, Public Works Research Institute
• 2-D Debonding Evolution in FRP Strengthened Plates Under Combined Loading by Shai Feldfogel, Technion-Israel Institute of Technology; and Oded Rabinovitch, Technion-Israel Institute of Technology
• Evaluation of Prestress Stress Relaxation Losses and Harping Strength Reduction of Prestressing CFRP Cables and Bars by Abdeldjelil Belarbi, University of Houston: Hamidreza Tahsiri and Mina M. R. Dawood, University of Houston; and Bora Gencturk, University of Southern California
• FRP Bond Strength to Concrete Using Bio-Sourced Resin Wet Layup by Amir Fam; Queen’s University
• FRP Shear Friction Reinforcement for Concrete Joints by Amr Abdel Fattah El Ragaby,University of Windsor; and Faouzi Ghrib, Jehad Alkatan, and Mofrhe Alruwaili, University of Windsor
• Impact Tests of RC Beams Flexurally Strengthened with CFRP Material by Norimitsu Kishi, National Institute of Technology, Japan; Masato Komuro and Yusuke Kurihashi, Muroran Institute of Technology, Japan; and Hiroshi Mikami, TRI of Sumitomo-Mitsui Construction Co., Ltd
• Interface between Carbon Fiber-Reinforced Polymer Sheets and Concrete Exposed to Freeze-Thaw Cycles by Wanting Wang, University of Colorado, Denver; and Yail Jimmy Kim, University of Colorado, Denver
• Research and Development of Concrete-Infilled FRP Pultruded Tubes by Thiru Aravinthan, University of Southern Queensland; and Weena Lokug and Ali Umran Alsaddi, University of Southern Queensland
• Seismic Evaluation of RC Frame Members Strengthened with CFRP NSM Bars by Elias I. Saqan, American University in Dubai; Hayder A. Rasheed, Kansas State University; and Tarek Alkhrdaji, Structural Technologies
• Steel-Free Multi-Girder Hybrid Deck System—Design Considerations and Construction Challenges by Raafat El-Hacha, University of Calgary
• Very Stiff Pultruded FRP Elements for Non-Continuous Reinforcement of Concrete by Ardavan Yazdanbakhsh, City College of New York; and Lawrence C. Bank, City College of New York

This session will describe preliminary reconnaissance of damage due to recent earthquakes and hurricanes. It will also discuss ways to improve resiliency of man-made structures to minimize devastating effects of natural hazards and to provide guidance for community planning.

• Seismic Data During September 7 and 19 Earthquakes Measured in a Building Located in Mexico City by Roberto Stark, Stark + Ortiz, S.C.
• Hurricane Maria by Jose (Pepe) M. Izquierdo Encarcion, Principal of PORTICUS CSP Consulting Firm, Rio Piedras, Puerto Rico
• The September 7 and 19, 2017 Earthquakes in Mexico: A First Look at their Impact by Sergio M. Alcocer, Professor Institute of Engineering, UNAM, Mexico

This session will address and clarify the requirements of the new energy conserving building codes and explain a clear path to compliance using the ACI 122R-14 guide as a reference. Descriptions of methods of optimizing energy performance integrating structural design and design for energy efficiency. This course will explain why energy code compliance and optimization of energy performance are key aspects of sustainable concrete and masonry building construction.

• Optimizing Energy Code Compliance for Concrete and Masonry by William McGinley, University of Louisville

The causes for concrete pavement cracking and how they are related to the development of early-age properties and their effect on long-term durability will be explored during this session. This includes:

• The effect of mixture design (including materials used and proportion of materials) on early-age properties and bridge deck and/or concrete pavement cracking
• The influence of construction practices on early-age properties and bridge deck and/or concrete pavement cracking
• The impact of specifications on early-age properties and bridge deck and/or concrete pavement cracking
• The relation between bridge deck and/or concrete pavement cracking caused by early-age properties development and the reduction of long-term durability
• Early-age measurement techniques that can evaluate early-age properties that are most related to bridge deck and/or concrete pavement cracking
• Quality assurance practices to prevent cracking
• Case studies

 

• Low-Shrinkage Fiber-Reinforced Concrete for Improved Crack Control and Durability by Amir Bonakdar, The Euclid Chemical Company
• Evaluating Crack-Reduction Technologies for Settlement Cracking in Concrete Bridge Decks by James D. Lafikes, University of Kansas; and Rouzbeh Khajehdehi, Muzai Feng, Eman Khalid Ibrahim, Matthew O’Reilly, and Dave Darwin, University of Kansas
• Modification to ASTM C157 to Measure Early-Age Deformation of Concrete Specimens by Muzai Feng, University of Kansas; and Eman Khalid Ibrahim, Rouzbeh Khajehdehi, James D. Lafikes, Matthew O’Reilly, and David Darwin, University of Kansas
• Field Evaluation of Early-Age Cracking in Concrete Bridge Decks and its Impact on Long-Term Durability by Aleksandra Radlinska, Pennsylvania State University; and Farshad Rajabipour, Pennsylvania State University
• Early-Age Bridge Deck Cracking—A Case Study by Elizabeth Nadelman, Wiss, Janney, Elstner Associates, Inc.

This session will highlight a diverse range of infrastructure project types on the U.S. West Coast and the innovative uses of precast concrete, cast-in-place concrete, and grout to solve complex engineering issues. Various applications of concrete pavements will also be discussed from both the client and designer perspective to understand the current serviceability challenges and advancements geared toward producing longer-lasting concrete pavements.

• The Future of Our Infrastructure, A Caltrans Perspective by Thomas Pyle, Caltrans
• SR99 Bored Tunnel by Chad Mathes, Dragados USA; and Francisco Gonzalez-Fernandez, Dragados USA
• Gerald Desmond Replacement Bridge Project by Tanya Wyckoff, Caltrans; and Zephaniah Varley, WSP/Parsons Brinckerhoff
• Cementitious and Non-Cementitious Grouting Techniques for Underground Construction by Luis Piek, Walsh-Shea Corridor Constructors

This session aims to provide the current knowledge in performance-based design of bridges. Bridges are a critical component of our infrastructure system and failure of bridges is a safety issue. More progress has been made in performance-based design in seismic analysis of buildings than that of bridges. AASHTO seismic requirements are based on the level of ductility of structural members, importance of the structure, level of deformation, and soil conditions. On the other hand, performance-based design is based on having bridge performance achieve defined performance criteria such as strength, ductility, or deformation. The session contains presentations of experimental and/or analytical research focusing on the performance-based design of bridges and bridge components.

• Seismic Performance Assessment of Concrete Bridge Piers Designed Following Canadian Highway Bridge Design Code by Rashedul Kabir, Qi Zhang and M. Shafria Alam, The University of British Columbia
• Seismic Design of Shape Memory Alloy Reinforced Concrete Bridge Pier by AHM Muntasir Billah, University of British Columbia; and Shahria Alam, University of British Columbia
• A Probabilistic Study to Identify the Effect of Different Damping Modeling Characteristic on the Seismic Response of R/C Bridges by Mohamed Moustafa, University of Nevada, Reno
• Performance of Horizontally Curved Highway Bridge with Seismic Isolation by Ahmed M. Abdel-Mohti, Ohio Northern University; Eric V. Monzon, California State University, Sacramento; Ian G. Buckle, University of Nevada, Reno; Ahmad M. Itani, University of Nevada, Reno
• Performance Limit States of Reinforced Concrete Filled Steel Tube Drilled Shafts by Diego A. Aguirre-Realpe, North Carolina State University

This session presents the state of practice for the performance-based seismic design (PBSD) of reinforced concrete buildings. The use of PBSD for new construction is expanding, as evidenced by the design guidelines that are available and the stock of completed building projects. These presentations bring together the implementation of PBSD through state-of-the art project examples, the current design guidelines employed, and research that supports PBSD.

• Performance-Based Seismic Design of the New Tocumen International Airport South Terminal in Panama City, Panama by Andrea Soligon, Partner Foster + Partners
• Revitalizing a Community Space Using Performance-Based Seismic Design by Saeed Fathali, Structural Technologies; and Bret Lizundia and Francisco Parisi, Rutherford + Chekene
• First Performance-Based Seismic Design Tower in Oakland, CA by Devin K. Daniel, Magnusson Klemencic Associates Inc.; and Ian S. McFarlane, Magnusson Klemencic Associates Inc
• Proportioning Strength to Limit Building Movements of Slender Core-Only Towers by David Shook, Skidmore, Owings & Merrill LLP; and Mark P. Sarkisian and Eric Long, Skidmore, Owings & Merrill, LLP
• Performance-Based Seismic Design by Joe Ferzli, Cary Kopczynski & Company; and Mark Whiteley and Cary S. Kopczynski, Cary Kopczynski & Company
• Design and Modeling Issues Related to Diaphragms of Tall Buildings by Gian Carlo Piatos, Univeristy of California, Los Angeles; John W. Wallace, University of California, Los Angeles; and Kristijan Kolozvari, California State University, Fullerton
• Analysis and Design of Reinforced Cast-in-Place Concrete Diaphragms by Drew Kirkpatrick, Thornton Tomasetti, Inc.; and Leonard M. Joseph, J. Ola Johansson, and Karem Gulec, Thornton Tomasetti, Inc.
• Performance Based Seismic Design vs. Code Level Design by Tom C. Xia, DCI Engineers
• Trends in Demands for Concrete Performance-Based Seismic Design Towers by Kevin Aswegan, Magnusson Klemencic Associates Inc.; and Ian S. McFarlane, Magnusson Klemencic Associates Inc
• Assessment of a 12-Story Code-Compliant Reinforced Concrete Special Moment Frame Using Performance-Based Seismic Engineering Standards and Guidelines: ASCE 41, TBI, and LATBSDC by Mustafa K Buniya, Oregon State University; Andre R. Barbosa, Oregon State University; and Siamak Sattar, National Institute of Standards Technology

These presentations will highlight the modernist structures in Southern California as well as throughout the country, including the unique technical challenges associated with preservation, repair, and restoration of these structures. Attendees with an interest and expertise in historic structures will leave with a better understanding of the architectural and construction history of these structures, their inherent challenges, and an overview of successful repair approaches.

• Dodger Stadium, Keeping an Icon Relevant by Janet Marie Smith, Los Angeles Dodgers; and Ryan Wilkerson, Nabin Yousset Associates Structural Engineers

Concrete pavements are an important pavement type for a range of applications—from lightly loaded streets to heavily loaded roadways and airfield facilities. It is becoming an established practice in the United States to require that concrete pavements provide low maintenance service lives of 40 or more years irrespective of the application. Long-life concrete pavements have been attainable for a long time (as evidenced by the fact that a number of very old pavements remain in service); and recent advances in design, construction, and concrete materials technology give us the knowledge and technology needed to consistently achieve what we already know to be attainable. To achieve long life, pavements must not exhibit premature failures and must have a reduced potential for cracking, faulting, spalling, and materials related distress. However, even though it is not a widespread occurrence, concrete pavements do once in a while exhibit premature or early-age failures, reducing the service life of the facility at a cost to the owners and facility users as well as creating a potential for litigation between the different parties involved in the affected projects. The proposed two-part technical sessions will include presentations by nationally recognized concrete materials, pavement design, and pavement construction experts on concrete pavement premature failures case studies and best practices to minimize or eliminate premature failures in concrete pavements. The session is targeted at concrete pavement, materials, and construction engineering professionals who are involved in various aspects of concrete pavement design, construction, testing and evaluation, and rehabilitation. These professionals include state and municipal engineers, consulting engineers, contractors, concrete materials suppliers, and academia.

• Troubleshooting and Improving Pavement Performance in Michigan by Daniel M. DeGraaf, Michigan Concrete Association

This session brings together important and influential information with respect to concrete construction in honoring Ward R. Malisch, Honorary Member of ACI. Contractors and engineers interested in the application of ACI documents to construction projects and in evaluating construction information with respect to constructability. Part 1 includes furthering knowledge of interesting common construction activities including: estimating effects of humidity, temperature an wind on curing slabs by estimating evaporation rates using ‘sophisticated’ the Menzel/NRMCA Nomograph approach; learning methods to accept concrete delivery times of 90 minutes or more in certain applications; understanding best location of vapor retarders below slabs-on-ground to minimize moisture penetration negatively affecting moisture sensitive floor coverings; real effect of placing water that is 20 F colder than concrete curing water on freshly placed slabs-on-ground; identify successful applications for using self-consolidating concrete in high strength concrete applications and use of hydration stabilizing admixtures to deliver and pump concrete in congested urban high rise building projects that far exceeds normal projects.

• Leveraging 3-D Laser Scanning for Concrete Analysis by Philip G. Lozenzo, Rithm