Complete List of Online Presentations

Search Free Online Presentations



Results Per Page 

2021 Online Presentations

2021 ACI Spring Convention, Virtual Sessions

123 Forum: Can Alkali-activated Materials Compete with Portland Cement?

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.

Adjusting Workability for Successful 3-D Concrete Printing, Part 1 of 2

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.

Adjusting Workability for Successful 3-D Concrete Printing, Part 2 of 2

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.

Architects' Day Lunch and Learn

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.

Architects' Day Session: Achieving Excellence in Concrete Construction – Following The REACH from Concept to Completion

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.

Architects' Day Session: Teamwork Makes the Dream Work

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

Best Practices and Lessons Learned for Teaching Concrete Materials and Reinforced Concrete

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.

The Concrete Industry in the Era of Artificial Intelligence

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.

Concrete Pavement Design and Construction Special Session Honoring Dr. Shiraz Tayabji

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.

Constructability and Shotcrete Construction in the Windy City

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.

Exploiting SSI Effects in Structural Design of Bridges

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.

Fusion of Visual and Nondestructive Techniques for Bridge Evaluation

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.

How to Get Modern Concrete Pumped to the Right Floor

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.

Is SCC Consolidation-Free?

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 Future of Coal Combustion Products in Concrete, Part 1 of 2

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.

The Future of Coal Combustion Products in Concrete, Part 2 of 2

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.

Integration of Innovative Techniques and Approaches for Optimum Concrete Structure Rehabilitation

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.

Microbially Induced Corrosion of Concrete

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.

Performance of Slag Cement with Portland-limestone Cement in Concrete

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.

Research in Progress

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.

Rethinking Reinforcement for 3-D Printed Cementitious Composites

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.

Smart Concrete, New Functionalities, and Nanotechnology

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.

UHPC – Innovations in Practical Applications

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.

Unlocking Workability Issues of UHPC

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.

Using ACI 318 PLUS as a Teaching Tool

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.

2020 Online Presentations

2020 ACI Spring Convention, Virtual Sessions

Bond and Development in New Types of Concrete and Reinforcement

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.

IBC-Compliant Concrete Construction & Laser Scans and Drones in Concrete Floor Construction

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.

Open Topic Session, Part 1 of 2

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

Open Topic Session, Part 2 of 2

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

Rethinking Reinforcement for 3-D Printed Cementitious Composites

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.

Textile Reinforced Cement Composites ‐ New Applications and Repair Materials

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.

2020 ACI Fall Convention, Virtual Sessions

Architects’ Day Session: Panel Discussion on Constructability

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

Architects’ Day Session: Shotcreting Architectural Concrete

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

Benchmarking of Codes, Specifications, and Models for Service Life

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.

Concrete with Recycled Materials

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

Design of Structural Concrete Slabs for Safety Against Punching and Excessive Deflection

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.

Effects of Internal Curing Using Pre-Wetted Lightweight Aggregates on Durability and Service Life of Reinforced Concrete Structures

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.

Examples for the Design of Reinforced and Prestressed Concrete Members Under Torsion

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.

How Resiliency Impacts Concrete Design

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.

Industry Experience on Unusual Reinforcing Steel Corrosion

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

Issues and Potential Solutions for Achieving Uniform Dispersion of Nanoparticles in Cementitious Composites and Concrete for the Laboratory and Field

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.

Open Topic Session

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

Recent Advances in Understanding Mechanisms of Mass Transport in Concrete

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.

Recent Research into the Design, Analysis and Testing of FRP Reinforced Columns

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.

Research in Progress, Part 1 of 2

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

Research in Progress, Part 2 of 2

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

SDC Innovations in Concrete: Sustainability, Constructability, and “Cost-ability” – The New Three-legged Stool?

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”.

Sessions Honoring Calvin McCall

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.

So You Think You Can Print? Challenges to 3-D Printing from Design to Permitting

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.

State-of-the-Art Evaluation of Signature Concrete Bridges

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.

Technologies to Reduce Shrinkage and Cracking

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.

The Intersection of Bond, Development Length, and Anchorage

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.

Use of Slag Cement in Concrete Construction

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

Why Nanofibers in Concrete?

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.

2019 Online Presentations

2019 ACI Spring Convention, Quebec City, Canada

Advanced Analysis and Testing Methods for Concrete Bridge Evaluation and Design

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.

Challenges and Opportunities for Scaling Additively Manufactured Concrete from Lab to the Field

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.

Effects of Extreme Events on Reinforced Concrete Columns

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.

Fiber-Reinforced Self-Consolidating Concrete: From Development to Use

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.

Hot Topic Session: Durability of Concrete: Aggregate Matters and Alternative Test Methods

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.

Innovative Techniques for Monitoring and Evaluating Concrete Bridges and Bridge Elements

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.

Measurement and Control of Workability in Concrete In-Transit Mixers

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.

Phase Change Materials in Concrete

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.

UHPC and UHPFRC: Innovations in Combining High Tensile Strength and High Ductility

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).

Visual Condition Survey of Concrete and Case Studies

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.

2019 ACI Fall Convention, Cincinnati, OH

Assessment of Concrete Prior to Rehabilitation

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.

Concrete Constructability: River of Knowledge

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.

Design and Construction of Concrete Streets and Local Roads

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.

Fire and Flood Design, Performance, Mitigation, and Strengthening for Concrete Bridges

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.

Hot Topic Session: Do We Have a Sustainable and Scalable Material to Address Carbon Steel Corrosion Once for All?

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.

International Workshop Session: Changes in ACI 318-19

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.

International Workshop Session: Concrete Construction in the Middle East

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.

International Workshop Session: Design of Super-Tall Reinforced Concrete Structures

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, 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.

Novel Techniques and Advances in Load Testing Concrete Structures

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.

Prestressed Concrete with Conventional and Nonconventional Materials

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.

UHPC – Innovations and Changes in Structural Design

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.

2018 Online Presentations

2018 ACI Spring Convention, Salt Lake City, UT

Concrete Modulus of Elasticity—How High is High

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.

Contractors’ Day Session: Concrete Construction

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

Controlling Fresh Properties of SCC for Adequate Placement (238)

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.

Fiber-Reinforced Concrete—From Fresh Properties to Structural Design: New Tools, Guides, and Reports

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.

FRP Design Methodology and Applications for Blast and Impact-Resistant Structures

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.

New Innovations in Chemical Admixtures

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.

Quality Management: The Common Thread of Good Practice

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.

Rating Methods for Defining Performance of Existing Concrete Bridges

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.

Repair of Concrete Session in Memory of Tony Murray

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.

Seismic Repair and Retrofit of Concrete Bridges

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.

Settlement Cracking from Theory to Practice

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.

The Role of Cracking on Corrosion of Reinforced Concrete

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.

2018 ACI Fall Convention, Las Vegas, NV

Blast Resistance of Precast Concrete

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.

Constructability: From Definition to Industry Practice

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.

History of Concrete

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.

Hot Topic Session: Busting 90 Minutes

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.

Hot Topic Session: Can Codes and Standards Improve the Performance and Longevity of Existing Concrete Structures?

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.

Materials Science Aspects Related to Digital Manufacturing (3-D Printing) of Cementitious Materials

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.

Seismic Rehabilitation—From Analysis to Practical Application

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.

Specifications for Repair of Concrete in Buildings

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.

Sustainable and Low-Cementitious-Materials-Content Self-Consolidating Concrete

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.

The Role of Materials in Sustainable Concrete Construction

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.

2017 Online Presentations

2017 ACI Spring Convention, Detroit, MI

Beneficiation of Fly Ash for Use in Concrete Mixtures

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.

Bond in Concrete

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.

Case Studies of Performance-Based Specifications

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.

Durability of Concrete Members Incorporated with Conventional and Advanced Materials

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.

Fire Resistance and Resiliency-Threats to Use of Concrete and Masonry Construction

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.

High-Strength (HS) Steel Reinforcement-Emerging Trends

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.

Shotcrete: New 506 Guide and Recent Developments

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 Role of Time and Temperature in Hot Weather Concreting

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.

UHPC—Innovations for Broad Application

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.”

2017 ACI Fall Convention, Anaheim, CA

Concrete and Digital Fabrication: Perspectives, Challenges and Developments

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.

FRP Symposium

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.

Hot Topic Session: Damaging Effects of Hurricanes Irma and Maria, and Recent Mexican Earthquakes

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.

How to Design and Construct Concrete and Masonry to Comply with New Energy Codes

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.

Influence of Early-Age properties on Crack Development and Long-term Durability – Bridge Decks

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


Making Connections – The Future of Our Infrastructure

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.

Performance-Based Design

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.

Performance-Based Seismic Design of RC Buildings: State of Practice

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.

SoCal Modernism – Preserving Concrete Modernist Structures

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.

Troubleshooting Concrete Pavements

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.

Ward R. Malisch Concrete Construction Symposium

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.

2016 Online Presentations

2016 ACI Spring Convention, Milwaukee, WI

ACI 562 Concrete Repair Code, Applicability, and Use (ACI Spring 2016 Convention, Milwaukee, WI)

The objective of the session is to educate government code officials, licensed design professionals, owners, and contractors on the applicability and use of ACI 562-13, “Code Requirements for Evaluation, Repair, and Rehabilitation of Concrete Buildings and Commentary,” and the new ACI/ICRI “Guide to the Code for Evaluation, Repair, and Rehabilitation of Concrete Buildings” through practical examples.

Advances in Test Methods to Evaluate Alkali-Aggregate Reactivity in Job Concrete Mixtures (ACI Spring 2016 Convention, Milwaukee, WI)

The principal objectives of the existing standard test methods for evaluating alkali-aggregate reactivity (AAR) in mortars and concrete is to identify the susceptibility of aggregates to undergoing alkali-silica reaction (ASR), to identify the effectiveness of supplementary cementitious materials (SCMs) in mitigating ASR, and quantify the suitable dosage level of SCMs in the concrete mixtures. However, these short-duration tests (the concrete prism test, mortar bar method test, accelerated mortar bar test, new concrete cylinder test, and new autoclave concrete prism test) have limitations in their ability to provide a direct measure of how a job’s concrete mixture might perform in the field over the long term. These sessions will shed light on developments in the areas of new test methods that are focused on assessing the alkali-silica reactivity potential of a job’s concrete mixture and new nondestructive test methods to evaluate the extent of damage in job concrete mixtures. Engineers, contractors, researchers, and students will benefit from learning about the latest research and test methods that will pave the way for a performance-based approach in specifying durability in concrete mixtures.

Concrete Bridges Built with Advanced Materials: Seismic Performance and Design Issues (ACI Spring 2016 Convention, Milwaukee, WI)

ACI Committee 341, “Earthquake-Resistant Concrete Bridges,” hosted a session on the seismic performance evaluation, design, and retrofitting of concrete bridges by using advanced materials such as shape memory alloy (SMA) in the form of reinforcing bar, wire, or strand; ultra-high-strength metals; ultra-high-performance cement composites; and nanosilica. The main objective of this session is to present results from recent research studies (experimental/numerical/analytical) and practical examples of application of advanced materials in reinforced concrete (RC) bridge piers, bents, or full bridges. This session is for practitioners, educators, and researchers.

Concrete Consolidation in the 21st Century (ACI Spring 2016 Convention, Milwaukee, WI)

The purpose of the session is to show the audience how consolidation needs to be reconsidered for modern twenty-first-century concrete mixtures. The anticipated presentations will show the influence of concrete proportioning and workability on the consolidation energy necessary. The contributions will mainly focus on flowable concrete that is not yet consolidating. The main audience for the session is contractors, but concrete producers, materials suppliers, designers, architects, and scientists will also have interest in this session.

Concrete Pavement Construction (ACI Spring 2016 Convention, Milwaukee, WI)

Effective construction practices are essential to the long-term performance of the concrete pavement structure. This session reviews successful construction practices for a range of concrete pavements.

Design of Concrete Elements Using High-Strength Reinforcement (ACI Spring 2016 Convention, Milwaukee, WI)

“Concrete elements have used reinforcement to improve concrete behavior. Advances in steel reinforcement have changed the traditional design and application of reinforced concrete elements. This session will discuss deflections of concrete beams reinforced with high-strength steel, design efficiencies using high-strength steel, using high-strength welded wire reinforcement in concrete structural applications, and design methodology for using ATM A1035 Grade 100 steel in reinforced concrete structural applications.

Ground Limestone and Mineral Filler: Inert Fillers or Active Ingredients? (ACI Spring Convention, April 2016, Milwaukee, WI)

This session will explore whether ground limestone and mineral filler should be considered inert fillers or considered to contribute to hydration, strength, economy, and sustainability of concrete mixtures. This session will show how the use of ground limestone and mineral filler affects concrete properties and how mixture proportions can be optimized to take advantage of these materials.

Hot Topic Session II: New One-Way Shear Equations for the 318 Building Code, Is it Time? (ACI Spring 2016 Convention, Milwaukee, WI)

The basic one-way shear equations in the ACI 318 Building Code have not changed since 1971, while other codes in the world have made changes. The current code consists of over 17 different equations. There have been advances in the understanding of size effect, members without transverse reinforcement, and members with the light longitudinal reinforcement. Members of Joint ACI-ASCE committees 445 and 446, and ACI Subcommittee 318-A devoted a great effort in the last two decades to investigate the effectiveness and safety of the current 318 one-way shear design equations. Immediately after the 318-14 Code cycle, the above committees challenged the researcher and practitioner community to present proposals for new one-way shear design methods that are safer and more effective for possible incorporation into the 318-19 code cycle. To date, six proposals have been submitted. These proposals were first evaluated against the existing 445 experimental shear database and then implemented in a comprehensive design example database that includes slabs, beams, and columns with prestress and non-prestress. This session will present the result summary of these evaluations and give a chance to each proposal’s author to describe the advantages of their method over the current 318-14 equations. The discussions held at this Hot Topic Session will be used by 318-E and 318 as input into their deliberations on the next step for one-way shear design for the 318-19 Building Code. This will be followed with a period of Q/A and attendees’ input and feedback on the new approaches.

    • Part 1
      Presentations include:
      • New Look at One-Way Shear Design Approach – ACI 318-E Initiative by David H. Sanders, University of Nevada
      • Summary of ACI-ASCE 445 Activities on One-Way Shear Design Methods by Abdeldjelil Belarbi, University of Houston
      • Use of Design Database to Compare Design Approaches by Daniel A. Kuchma, Tufts University
      • One-Way Shear Design Method Based on a Multi-Action Model by Antoni Cladera, University of Balearic Islands; and Antonio Marí and Jesús Bairan, Polytechnic University of Catalonia
    • Part 2
      Presentations include:
      • One-Way Shear Design Method – A Unified Approach by Robert J. Frosch, Purdue University; Qian Yu, University of Pittsburgh; Zdenek P. Bazant and Gianluca Cusatis, Northwestern University; Mija H. Hubler, University of Colorado, Boulder; and Jialing Le, University of Minnesota, Minneapolis
      • One-Way Shear Design Method – Simplifying the ACI Shear Provisions by Evan C. Bentz, University of Toronto; and Michael P. Collins, University of Toronto
      • One-Way Shear Design Method – Unified Theory by UH-NTU Version by Thomas T.C. Hsu, University of Houston; and Yi-An

Leveraging Mobile Technology in Design of Low-Rise Concrete Buildings (ACI Spring 2016 Convention, Milwaukee, WI)

“Guide to a Simplified Design for Reinforced Concrete Buildings,” ACI 314R-16 presents simplified methods and design techniques that facilitate and speed the engineering of low-rise buildings within certain limitations. Material is presented in an order that follows typical design process with procedures introduced as the designer will need them in the course of a building design. An overview of ACI 314R-16 and the easiness of integrating modern calculation platforms for quick analysis and design will be presented.

Precast Concrete Pavements (ACI Spring Convention, April 2016, Milwaukee, WI)

The production use of precast concrete pavement (PCP) has come a long way over the last 15 years. Since the first new-generation PCP projects were constructed during 2001, the technology has gained wider acceptance in the United States for rapid repair and rehabilitation of concrete pavements, as well as for heavily trafficked asphalt concrete pavements and intersections. Since 2001, many projects have been constructed and many advances have been made and continue to be made in the design, panel fabrication, and panel installation aspects of the technology. In the United States, the PCP technology is being used for intermittent repairs (full-depth or full-panel replacement) and for continuous applications (longer length/wider area rehabilitation) with service life expectations of at least 20 years for repairs and at least 40 years for continuous applications, without significant future corrective treatment.

This session, organized by ACI Committee 325, with support from the Federal Highway Administration (FHWA), will present the current developments and best practices related to PCP design, panel fabrication, and panel installation processes. In the first session, experts from several highway agencies, including Wisconsin DOT, will present the implementation details related to new PCP applications by their agencies.

Proportioning with Ground Limestone and Mineral Filler (ACI Spring Convention, April 2016, Milwaukee, WI)

This session will introduce the new document developed by ACI Subcommittee 211-N, "Guide to Proportioning Concrete Mixtures with Ground Limestone and Other Mineral Fillers," and provide case studies for ground limestone and mineral filler.

2016 ACI Fall Convention, Philadelphia, PA

Advanced Analysis of FRP-Strengthening Concrete Structures (ACI Fall 2016 Convention, Philadelphia, PA)

Advanced Analysis of FRP-Strengthening Concrete Structures (ACI Fall 2016 Convention, Philadelphia, PA)
This session targets the application of advanced analytical techniques for the analysis and design of fiber-reinforced polymer (FRP) strengthened concrete structures, with an emphasis on structure and member behavior, as well as debonding and anchorage devices. It will be suitable to designers of FRP strengthening measures as well as researchers and manufacturers.

Construction Documents Using ACI 301 to Comply with ACI 318 Chapter 26 (ACI Fall 2016 Convention, Philadelphia, PA)

ACI Subcommittee 440-M, FRP-Repair of Masonry Structures, is sponsoring this technical session focusing on various applications of fiber-reinforced polymer (FRP) systems for masonry structures. Presentations relate to the FRP strengthening of existing masonry elements, and the use of FRP bars as internal reinforcement in new masonry construction. Current developments in design guides are presented, including international coverage of research and application. The goal of this session is to present the current state of the art in research and practice on the use of FRP systems to strengthen existing masonry structures, and to reinforce new masonry construction.

Early-Age Concrete Properties Measurements for Concrete Pavement Construction Operations and Traffic Opening (ACI Fall 2016 Convention, Philadelphia, PA)

Early-Age Concrete Properties Measurements for Concrete Pavement Construction Operations and Traffic Opening (ACI Fall 2016 Convention, Philadelphia, PA)
This session will promote best practices for obtaining the early-age concrete properties desirable for good concrete pavement performance based on reliable measurements instead of empirical evaluation, guessing estimates, or personnel experience.

Evaluation of Concrete Structures (ACI Fall 2016 Convention, Philadelphia, PA)

The structural evaluation process of existing concrete structures involves the understanding of existing capacity, safety, and future expected life. Although there are some codes and guidelines to help engineers to obtain this information, the acceptable criterion is the target reliability index, which is rarely used or defined in current codes. The objective of the proposed session is to present the challenges and solutions using more rational reliability approaches in evaluating concrete structures. Papers on evaluation methods, prediction models, reliability analysis, and code calibration will be presented.

Fiber-Reinforced Polymer (FRP) Systems for the Strengthening of Existing Masonry Structures and for Reinforcement of New Masonry Structures (ACI Fall 2016 Convention, Philadelphia, PA)

ACI Subcommittee 440-M, FRP-Repair of Masonry Structures, is sponsoring this technical session focusing on various applications of fiber-reinforced polymer (FRP) systems for masonry structures. Presentations relate to the FRP strengthening of existing masonry elements, and the use of FRP bars as internal reinforcement in new masonry construction. Current developments in design guides are presented, including international coverage of research and application. The goal of this session is to present the current state of the art in research and practice on the use of FRP systems to strengthen existing masonry structures, and to reinforce new masonry construction.

Hot Topic Session (ACI Fall 2016 Convention, Philadelphia, PA)

The use of alternative cementitious materials (ACMs) in construction is a developing technology. Currently, specifications and design codes are based on the use of portland cement as the primary binding ingredient. The use of ACMs is rapidly advancing, requiring owners, contractors, and engineers to address specifying, testing, and performance of ACMs. This session will offer perspectives on the challenges of ACMs and how specifications, building codes, and construction practices are adapting to new ACM technology.

Rational Design Methodologies: Fire Resistance of Concrete and Masonry (ACI Fall 2016 Convention, Philadelphia, PA)

This session will review the current methodologies for fire resistance design, including the ACI/TMS 216.1 requirements for determining fire resistance of concrete and masonry assemblies. Looking forward, rational design approaches will be discussed, as well as the current knowledge gaps that must be addressed before such methodologies could be standardized. A review of current research in fire performance of concrete and masonry will also be reviewed, especially as that research relates to promoting rational design methods.

Repair and Rehabilitation Tech Notes (ACI Fall 2016 Convention, Philadelphia, PA)

The Tech Notes produced by ACI Committee 364, Rehabilitation, cover important aspects of a concrete rehabilitation program, ranging from the initial stages of evaluation to strengthening and to conducting repairs so as to ensure a long service life.

Responsibility in Concrete Repair (ACI Fall 2016 Convention, Philadelphia, PA)

The responsibilities for parties involved in a repair project may be significantly different than those traditionally encountered in new concrete construction. The new ACI 562 Code Requirements for Assessment, Repair, and Rehabilitation of Concrete Buildings and anticipated ACI 563 Specification identify requirements for the Licensed Design Professional and the contractors’ specialty engineer during repair programs. Differing lines of authority are presented through industry practice recommendations and case studies, along with identification of industry needs, informing parties engaged in concrete evaluation and repair projects.

Revolutionary Tilt-Up Design (ACI Fall 2016 Convention, Philadelphia, PA)

Recently, tilt-up concrete has been used in new building types, which has advanced the industry’s technology and has provided unique solutions to building programs. This has been achieved through innovative engineering and construction. This session will disseminate information related to slender reinforced concrete, known as “tilt-up” or “site-cast tilt-up concrete.

Sulfate Attack on Concrete (ACI Fall 2016 Convention, Philadelphia, PA)

This course explores deterioration of concrete due to sulfate attack, a complex process characterized by multiple manifestations including volume expansion, cracking, spalling, softening of the cementitious matrix creating mushy concrete. Sulfate attack can be classified as internal or external to the cementitious matrix. The underlying damage of sulfate attack can be chemical or physical deterioration. The course scope involves theoretical and experimental aspects of different forms of sulfate attack as well as case studies. This course is an effort to compile current developments in research and standards, and educate practitioners and researchers about this concrete durability issue and its underlying mechanisms. And the effects of supplementary cementitious materials on mitigating external sulfate attack on concrete exposed to sulfates.

2015 Online Presentations

2015 ACI Spring Convention, Kansas City, MO

Building Resiliency (ACI Spring Convention, April 2015, Kansas City, MO)

The Road to Resilience lies in adapting. Cities, towns, and communities, working with the construction industry, continue to rebuild and prevent against the challenges that face our buildings—both from natural disasters and aging structures. These presentations offer knowledge that stricter standards and design elements can go a long way to reaching our goal of being “resilient.”

Form Pressure of Self-Consolidating Concrete—Hydrostatic or Not? (ACI Spring Convention, April 2015, Kansas City, MO)

This technical session will highlight recent advances carried out to understand key factors affecting formwork pressure of SCC, including concrete thixotropy, casting rate, and formwork characteristics. The session will highlight various models that have been developed to estimate form pressure characteristics of SCC. A number of field-related projects targeting the calibration of various models are discussed. The session should be of interest to designers and construction professionals dealing with SCC technology, as well as researchers and educators interested in the science behind the control of form pressure.

Heavy-Duty Concrete Pavements (ACI Spring Convention, April 2015, Kansas City, MO)

Heavy-duty pavements span a wide variety of uses, from truck distribution facilities, to intermodal yards, to military equipment hardstands, to high-volume interstates. These pavements can be subjected to extremely high axle loadings, millions of heavy vehicle load repetitions, high-speed truck traffic, or all of these. Designers and contractors must understand the unique requirements of these pavements, and use appropriate design tools, specification provisions, and construction techniques to properly design and build the pavements for their expected service lives. Concrete pavements are ideally suited for these applications because of their rigidity, strength, and durability. However, different types of concrete pavements, including conventional jointed pavements, roller-compacted concrete (RCC), and precast, may be optimal choices depending on the circumstances.

Influence of Admixtures on Early-Age Properties (ACI Spring Convention, April 2015, Kansas City, MO)

The objective of this session will be to address the influence of chemical and mineral admixtures on the early-age properties of concrete, mortar, and grout. The session will educate practitioners on methods to measure early shrinkage, and to examine the effect of admixtures on early-age properties.

Pumpability of SCC (ACI Spring Convention, April 2015, Kansas City, MO)

This session intends to inform concrete producers, contractors, academics, and students on the latest developments, common practices, and problems associated with pumping of self-consolidating concrete (SCC). The session focuses on selecting materials and optimizing mixture design to ensure adequate pumping of SCC. Practical experiences on the quality control of SCC for the construction of the Burj Khalifa, as well as the influence of SCC fresh properties on changes in the air void system due to pumping are discussed. The latest theoretical developments on prediction of pumping pressure, influence of constituent elements, and the changes in fresh concrete properties are also presented.

Rational Approaches for Fire Resistant Design of Concrete Structures (ACI Spring Convention, April 2015, Kansas City, MO)

This session provides an opportunity for researchers, architectural/civil/structural engineers, and students to exchange recent advances in applied research and to share information, experiences, and knowledge in the implementation of rational design approaches for determining the fire resistance of a range of concrete structures.

Recent Updates to Blast Design Guidance (ACI Spring Convention, April 2015, Kansas City, MO)

In this session, recent updates to blast design guidance will be presented. The session will focus on new criteria incorporated in “Structures to Resist the Effects of Accidental Explosions,” UFC 3-340-02, Change 1 (2014). These criteria include a major revision to the UFC’s analysis and design procedures for reinforced and unreinforced masonry walls and a new testing protocol and performance requirements for mechanical splices that will, for the first time, permit their use on certain explosives safety applications. In addition, recent research will be presented on the performance of concrete elements under blast loading.

Resilient Housing (ACI Spring Convention, April 2015, Kansas City, MO)

This session will explore the topic of resilience as it pertains to the homes we live in and the communities they create. Attendees will come away with a greater understanding of economic and societal impacts of less durable housing, what it means to be resilient, and ways to create better buildings with concrete systems. New research into measuring the resilience of a home will link the use of concrete materials and systems to sustainable, longer-lasting structures. It will also detail the ways in which specific weather events such as high winds and storm surge can affect the built environment. Attendees will hear about protective measures for creating hazard-resistant housing using concrete building solutions. Case studies of real-world concrete homes subjected to severe weather will examine their design, construction, and performance to demonstrate that current technology exists to prevent this type of damage.

Ternary Blends and More (ACI Spring Convention, April 2015, Kansas City, MO)

This session looks at the use of multiple blends of cementitious materials used for designing durable and ultradurable concretes. The use of ternary and quaternary blends to achieve long-term lifetimes, and thus lower environmental impact, will be discussed.

Use of High-Strength Concrete in Tall Buildings (ACI Spring Convention, April 2015, Kansas City, MO)

The objective of the session is to inform practitioners and engineers on the use of high-strength concrete (HSC) in tall buildings. There has been a significant amount of research regarding the development of HSC, but the learning outcomes of this session include topics related to the delivery, placement, testing (including in-place), and case studies of HSC in tall buildings.

2015 ACI Fall Convention, Denver, CO

ABC Connections for Seismic-Resistant Design (ACI Fall Convention, October 2015, Denver, CO)

ABC connections for concrete bridges are becoming more common in practice. It is the goal of this session to assess the current state of the art in research and practice regarding the use of ABC connections for the seismic design of concrete bridges.

BIM for Cast-in-Place Concrete (ACI Fall Convention, October 2015, Denver, CO)

The objective of the session is to inform ACI members of the progress made by ACI Committee 131 on developing open information exchange between various software products used in the concrete supply chain. The information delivery manual (IDM) and model view definitions (MVD) developed by the committee will be presented and explained. A presentation will also be made of state-of-the-art applications of BIM in the concrete supply chain.

Cement-Admixture Interaction (ACI Fall Convention, October 2015, Denver, CO)

The session will discuss various test methods that can be used to evaluate early stiffening of cement paste or mortar to anticipate complex cement-admixture interactions. The session will also highlight recent findings aiming at understanding the physical and chemical phenomena affecting the adsorption of chemical admixtures on binder materials and the resulting effects on fresh and hardened properties of concrete. The session should be of interest to researchers, concrete engineers, material suppliers, and students dealing with modern materials design and construction. Attendees will become aware of recent advances in testing techniques and governing mechanisms affecting cement-admixture interaction.

Cementitious Materials for Nuclear Waste Storage and Disposal (ACI Fall Convention, October 2015, Denver, CO)

Cementitious materials have widespread use in nuclear waste storage and disposal applications, including waste form stabilization, dry storage structures, and repository applications, and in each application, the use of cement-based materials presents unique challenges. For cement-stabilized wastes and repository applications, the transport of radionuclides through the cementitious materials is of great concern, as certain radionuclides are highly mobile in high-pH pore fluid. For intermediate-term dry storage, thermal, radiation, and environmental loading can influence degradation of the portland cement concrete structures, which in turn impacts safe storage.

This session addresses the measurement and modeling of properties that will improve the understanding and prediction of the long-term structural, hydraulic, and chemical performance of cementitious materials used in nuclear waste disposal.

Chloride Limits and Thresholds for Concrete Containing Supplementary Cementitious Materials (SCMs) (ACI Fall 2015 Convention, Denver, CO)

ACI uses cement content alone as the basis for allowable chloride limits for new construction. With the heightened use of SCMs and performance specifications for cement, there is need to evaluate using total cementitious materials content as the basis for allowable chloride limits in new construction and for chloride thresholds. These allowable and critical chloride values, along with other important factors, can significantly impact the service life of reinforced concrete structures. The purpose of these sessions is to inform the audience of recent research in these areas so that recommendations on the allowable and critical chloride values can be evaluated and validated. This session will be useful for researchers, engineers, consultants, and those developing standards and specifications.

Concrete with Recycled Materials (ACI Fall 2015 Convention, Denver, CO)

Concrete is one of the most widely used construction materials in the world. However, the production of portland cement, an essential constituent of concrete, leads to the release of significant amount of carbon dioxide, a greenhouse gas. It also leads to depletion of aggregate and water resources.

Environmental issues are playing an important role in the sustainable development of the cement and concrete industry. A sustainable concrete structure or infrastructure is concrete which is constructed which minimizes the environmental impact through its life cycle, Concrete is considered sustainable material. It has low inherent energy requirements, it’s produced to order with little waste, it’s made from plentiful resources and can be made with recycled materials and recycled crushed aggregates, and it is recyclable itself. Many recycled materials that can be used in concrete, starting from recycled water and recycled aggregates and recycled by-product materials can be implemented in many different concrete structure applications.

Curing—Finish the Construction (ACI Fall 2015 Convention, Denver, CO)

Curing is an often-overlooked part of the concrete construction process. When planning for constructability, don’t forget to plan for curing. This course will be useful to all participants in concrete construction projects.

Deflections and Construction Tolerances: The Good, the Bad, and the Ugly (ACI Fall Convention, October 2015, Denver, CO)

Demands for thinner, lighter structures, coupled with advances in material strengths, construction techniques, and structural analysis software, make serviceability an increasingly important limit state for modern concrete buildings and bridges. This session tackles concrete issues related to deflections, particularly through the lens of constructability. The session will highlight project successes and misfires and delve into reasons leading to the outcomes.

Design and Performance of Concrete Bridges and Buildings When Interacting with Soils and Foundations (ACI Fall Convention, October 2015, Denver, CO)

This special session will emphasize the design and performance of concrete bridges and buildings with consideration for interaction with soils and foundations, including deep or shallow foundations. Given soil structure interaction as being a critical factor in the design of most buildings and bridges, a technical forum is needed to exchange current knowledge and develop research needs. Presentations will encompass a wide variety of technical issues such as the effect of differential settlement on the behavior of structures, backfills for bridge abutment, and earthquake-induced responses of structures. 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 issues. Critical information is provided to those who lead tomorrow’s structural design and construction in conjunction with soils and foundations, including practicing engineers, government officials, and academics.

Emerging Technologies in Civil Infrastructure (ACI Fall Convention, October 2015, Denver, CO)

The session’s aim is to highlight some of the current emerging industry technologies identified by SDC. This particular session will present overviews of newer curing technologies currently or soon to be impacting the concrete industry. They are in various stages of and directly involved in their implementation and further development.

Hot Topic Session: Constructability of Projects Designed for 100+ Year Service Life (ACI Fall Convention, October 2015, Denver, CO)

This Hot Topic Session addresses aspects of construction on projects that demand a 100+ year service life. The session will provide perspectives from the diverse set of players involved in these projects. This includes owners charged with balancing the requirements of the project with the expectations of the public; design engineers who must develop plans and specifications that must address the complexity of the structural, durability, and constructability requirements of the project; contractors who must implement these demands; and materials testing laboratories that need to validate the durability of the materials.

Legacy of Per Fidjestøl (ACI Fall Convention, October 2015, Denver, CO)

Per Fidjestøl was a pioneer in the concrete industry. An ACI Fellow and Honorary ACI member, Fidjestøl spent 45 years in the concrete industry. During the tenure of his concrete career, Fidjestøl contributed to the development of high-performance concrete incorporating silica fume for sustainable construction. The purpose of this session is to honor both the legacy of Per Fidjestøl’s early work with concrete and highlight some of the current state-of-the-art research. Ultimately, the technical session is designed to celebrate the 45 years that Fidjestøl contributed to advancing the sustainable development of concrete structures. We celebrate not only his involvement in new concrete technologies but also how he educated the industry. Whether through his many appearances at conferences across the world or as a Professor at the University of Agder, Fidjestøl helped cultivate and refine a new generation of concrete scientists and engineers.

SHM Real-Life Applications (ACI Fall Convention, October 2015, Denver, CO)

Structural health monitoring (SHM) is a process aimed at providing actionable, accurate, and in-time information concerning structural health condition and performance of concrete structures. The information obtained from monitoring is generally used to plan and design maintenance activities, to increase the safety and to mitigate post-event consequences, to verify hypotheses, to reduce uncertainty, and to widen the knowledge concerning the concrete structure being monitored. While SHM benefits have great promise, SHM is still not applied in a widespread manner, and the end users are frequently reluctant to apply it.

The aims of this session are to pull together several examples of SHM real-life applications, raise awareness about how the SHM is applied, understand:
1. The overall behavior of concrete structure, and identify related challenges; and
2. To present case studies of SHM real-life applications and assess the corresponding SHM benefits, and present them to interested parties and broader public by presentations during the session.

2014 Online Presentations

2014 ACI Spring Convention, Reno, NV

The ACI 562 Code (ACI Spring Convention, March 2014, Reno, NV)

The development, approval, and adoption of the ACI 562 Code for Evaluation, Repair and Rehabilitation of Existing Concrete Structures represents a milestone in the concrete repair industry. For the first time, a code has been developed to specifically address and provide code requirements for the repair of existing concrete structures. The session will describe key features of ACI 562, describe the process for adoption of ACI 562 into general building codes, and present the process for ongoing development of ACI 562.

Contractors’ Day Session: Bridges that Endure (ACI Spring Convention, March 2014, Reno, NV)

Concrete Bridges in the region face numerous obstacles to endure: seismic loading, severe climatic conditions, marine environments, and high wind loading. Learners will hear how each of these obstacles was overcome for two signature bridge projects in Nevada and California.

Current Practices in Online Learning (ACI Spring Convention, March 2014, Reno, NV)

This session will provide information on the most current practices related to online learning to include webinars; online courses for credit; and hybrid courses where students view course material online, then work on problems during class.

Hot Topic Session: Moisture in Concrete Slabs (ACI Spring Convention, March 2014, Reno, NV)

Due to several changes in the construction market, including EPA regulation changes to the allowable VOC content in adhesives and the rise of fast-track construction projects, moisture-related flooring failures have become more prevalent in concrete slab construction. In response, contractors have been seeking ways to combat these problems without impacting construction schedules. The panelists, including a general contractor, vapor-barrier manufacturer, national consulting firm specializing in moisture testing, and a national flooring consultant, will provide a 360-degree view of this important topic.

Hydration of Low Portland Cement Binders: Industry Experience and Needs (ACI Spring Convention, March 2014, Reno, NV)

This session will showcase new advances in experimental, theoretical, and computational tools for characterizing cements, IBPs, natural minerals, and hydration and microstructure development in low-cement-content concrete binders. The technical content should be of great interest to both the academic and industrial community and of special interest to those involved in sustainable materials design and development, those who specify binder materials to be used in construction, and those who promulgate standards and codes for using low-cement-content concretes.

Monitoring for Cold Weather Concreting (ACI Spring Convention, March 2014, Reno, NV)

The current model for cold weather concreting operations is based on the Thermos Concept–make the concrete hot and then keep it hot. The bulk of the technical aspects of the current ACI 306 document are based on work done over 30 years ago. The practice of cold weather concreting has changed significantly since that time. The changes in cement chemistry and fineness, the widespread use of slower-reacting materials in the interest of sustainability, as well as the ubiquity of the Internet and electronic sensors needs to be incorporated into the revisions to the guide to cold weather concreting as well as to the specification currently under development.

Proportioning of Mixtures for Concrete Pavements (ACI Spring Convention, March 2014, Reno, NV)

This session will provide insight into current developments regarding mixture design and proportioning, specifically for concrete pavements. The session will include discussions of current issues and innovations related to mixture design, including use of self-consolidating mixtures, optimization of aggregate gradation, handling of various durability situations, and mixture component incompatibilities. The speakers have different backgrounds and come from material suppliers, associations, consulting, and academia.

Seismic Assessment of Existing Reinforced Concrete Buildings (ACI Spring Convention, March 2014, Reno, NV)

ACI Committee 369 is working with ASCE Committee 41 on the state of the art of seismic assessment of reinforced concrete buildings. These sessions will present potential updates for ASCE 41 and summarize work done by committee members on modeling parameters and acceptance criteria for concrete components, including columns, joints, and walls. Example applications of ASCE 41-13 to existing concrete buildings will also be presented. This session will be of value to practicing engineers engaged in seismic retrofit projects using ASCE 41.

Unconventional Reinforced Concrete Bridge Columns (ACI Spring Convention, March 2014, Reno, NV)

New trends in innovative design and construction of unconventional concrete columns will be presented to promote advancement in this important application. The sessions will include the use of innovative materials, new confinement techniques, and fiber-reinforced concrete. It also includes varying the loading patterns and the geometry of the columns.

Seismic Assessment of Existing Reinforced Concrete Buildings—New Developments (ACI Spring Convention, March 2014, Reno, NV)

ACI Committee 369 is working with ASCE Committee 41 on the state of the art of seismic assessment of reinforced concrete buildings. These sessions will present potential updates for ASCE 41 and summarize work done by committee members on modeling parameters and acceptance criteria for concrete components, including columns, joints, and walls. Example applications of ASCE 41-13 to existing concrete buildings will also be presented. This session will be of value to practicing engineers engaged in seismic retrofit projects using ASCE 41.

2014 ACI Fall Convention, Washington, D.C.

Advances in Pervious Concrete (ACI Fall Convention, October 2014, Washington, D.C.)

This session focuses on disseminating the advances that have happened in the field of pervious concretes, in material design, proportioning, properties, standards development, and field applications.

Aggregate Optimization and Packing (ACI Fall Convention, October 2014, Washington, D.C.)

The mechanical properties of portland cement concrete, such as mechanical strength, modulus of elasticity, creep, and shrinkage, greatly depend on the properties of their main constituent: the aggregates. Packing density, compaction degree, particle size, and spatial distribution of aggregates affect the macromechanical behavior of concrete. This session will discuss how better aggregates’ packing and optimal distribution can improve the performance of concrete.

Celebrating 100 Years of John Joseph Earley and the Earley Studio Work (ACI Fall Convention, October 2014, Washington, D.C.)

This session will be dedicated to M. K. (Mary Krumboltz) Hurd, The Woman Who Formed Concrete. Architectural concrete and ACI pioneer John J. Earley left a legacy of distinctive work throughout the United States, but nowhere more than in Washington, DC. These sessions will present some of the outstanding Earley Studio projects in the nation’s capital and other parts of the country. The history of John J. Earley’s innovation will highlight distinctive features at Meridian Hill Park, the Shrine of the Sacred Heart, the Polychrome Houses, and the Franciscan Monastery of the Holy Land in America. These spectacular projects illustrate the revolutionary work done in concrete nearly 100 years ago. You will be amazed by concrete’s resilience and aesthetic durability.

Emerging Technologies in Civil Infrastructure (ACI Fall Convention, October 2014, Washington, D.C.)

The goal of the ACI Foundation’s Strategic Development Council (SDC) is industry-wide collaboration to address the concrete industry’s technological challenges and to create a forum for the introduction and nurturing of new technologies. This session highlights issues of importance in the concrete industry and overviews of newer technologies currently or soon to be impacting the concrete industry. The presentations are by individuals who are both well-versed in the specific issue or technology and directly involved in their implementation and further development.

James K. Wight: A Tribute from His Students and Colleagues (ACI Fall Convention, October 2014, Washington, D.C.)

This session is aimed at disseminating information related to past and current research on behavior of reinforced concrete flexural members and walls, as well as on structural collapse.

Self-Consolidating Concrete for Precast/Prestressed Applications (ACI Fall Convention, October 2014, Washington, D.C.)

The hardened properties and performance of self-consolidating concrete (SCC) developed for use in precast prestressed applications will be discussed. Presentations will specifically focus on SCC mechanical properties, durability, time-dependent behavior, structural behavior, and case studies that document the use of SCC in full-scale precast prestressed applications.

Structural Health Monitoring of Concrete Structures (Durability)—Tribute to Richard Weyers (ACI Fall Convention, October 2014, Washington, D.C.)

Sponsored by ACI Committees 444, Structural Health Monitoring and Instrumentation; 209, Creep and Shrinkage in Concrete; 222, Corrosion of Metals in Concrete; 345, Concrete Bridge Construction, Maintenance and Repair; 348, Structural Reliability and Safety; 365, Service Life Prediction; 435, Deflection of Concrete Building Structures; and Joint ACI-ASCE Committees 343, Concrete Bridge Design, and 441, Reinforced Concrete Columns.

Sustainable Performance of Concrete Bridges and Elements Subject to Aggressive Environments: Monitoring, Evaluation, and Rehabilitation (ACI Fall Convention, October 2014, Washington, D.C.)

This session will emphasize the sustainable performance of concrete bridges and their elements when subjected to aggressive environments. Presentations will include a variety of technical aspects such as durability of concrete members, performance monitoring technologies, evaluation methodologies, damage assessment, and structural rehabilitation. 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 issues. Critical information is given to those who lead tomorrow’s bridge design and construction, including practicing engineers, government officials, and academics.

Featured Presentation

Applications of UHPC Vertical & Horizontal Panels
by Vic Perry, ceEntek North America

Please enter this 5 digit unlock code on the web page.