Sessions & Events

 

All sessions and events take place in Pacific Standard Time: PST (GMT-8). On-demand sessions will be available for viewing in the convention platform under "On-Demand Content" within 24-48 hours of the session premiere. Please note, on-demand sessions are not available for CEU credit. * Denotes on-demand content.


ACI/JCI – 6th Joint Seminar - Advancing the Design of Concrete Structures - Concrete Material Advancements, Part 2 of 4

Monday, April 3, 2023  4:00 PM - 6:00 PM, Franciscan A&B

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

Learning Objectives:
(1) Describe the development of UHPC materials for use in pretensioned bridge girders;
(2) Evaluate the impact of high strength materials on changing building design;
(3) Understand how ductile composite materials can be used to improve the seismic response of structures;
(4) Identify the benefits of additive manufacturing processes for creation of new material types.


Development and Application of Non-Proprietary UHPC Mixtures for Pretensioned Bridge Girders

Presented By: Mary Beth D Hueste
Affiliation: Texas A&M University
Description: The advanced properties of ultra-high-performance concrete (UHPC) make it attractive for application to precast pretensioned bridge girders. However, there are several challenges that have slowed the application of UHPC in the precast industry, such as the high cost of available UHPC mixtures in the market, slower production due to longer curing times, additional precast facility requirements for heat or steam curing and material storage, along with limited structural design guidance. The aim of this research is to address these concerns and to support the application of UHPC in the precast industry, with a specific focus on precast, pretensioned bridge girders in Texas. An analytical feasibility study identified potential increases in span length that can be achieved using UHPC bridge girders when compared to conventional precast, prestressed concrete bridge girders. Non-proprietary UHPC mixtures without heat treatment were designed to meet the target strengths of 13-14 ksi at release and 20-22 ksi at service. Several UHPC mixtures were developed using both Type I/II and Type III Portland cements. The developed UHPC mixtures were tested to determine a range of fresh and hardened properties, and to assess durability. A non-proprietary UHPC mixture was adapted to use the standard materials available at a local precast plant, and the mixing procedure was further refined to support implementation in the precast plant environment. Full-scale precast, pretensioned UHPC bridge girders were fabricated at the precast plant and tested in the laboratory to evaluate flexure and shear performance. This presentation describes the overall research program and provides specific findings with respect to the development and application of non-proprietary UHPC mixtures to precast, pretensioned bridge girders.


Reinforced Concrete Buildings using High Strength Material

Presented By: Tsutomu Komuro
Affiliation:
Description: Recent study and application of high strength material to high-rise buildings in Japan are discussed. Since the 1980’s, the demand for high-rise buildings especially for residential use in urban areas has continued to increase, because of the increase in the population shift from suburban to urban areas. Affected by this demand, high strength materials were developed. As a result of many studies of structural experiments and precast construction methods using high strength materials, many high-rise RC buildings have been designed and constructed in Japan. Also, in order to make structural seismic performance higher, hinge relocation system had been developed and applied to a high-rise building.


Seismic Response and Design Considerations of Structural Components and Systems using Ultra-High-Performance Concrete and Other Ductile Concrete Materials

Presented By: Matthew Bandelt
Affiliation: New Jersey Institute of Technology
Description: Concrete materials with high ductility and strength have emerged in recent years with applications to improve the seismic response of reinforced concrete structures. This presentation will explore differences in component-level response between traditional reinforced concrete elements and those made with highly ductile systems through recent experimental testing and numerical simulations. The plastic hinge response, rotational capacity, and failure modes in elements with highly ductile concrete materials will be presented, and implications for design of components using these materials will be discussed. The system-level seismic response of building frames incorporating these emerging materials will then be presented and implications in terms of construction (concrete volume, rebar tonnage, etc.) and structural response (collapse capacity, mean annual frequency of collapse, etc.) will be discussed.


Simulation-and-Learning Driven Design of Cementitious Mechanical Metamaterials

Presented By: Tetsuya Ishida
Affiliation: The University of Tokyo
Description: Additive manufacturing of cementitious materials has a great potential for enlarging the freedom of form of concrete structures. This next-generation technology opens up a new possibility – cementitious metamaterial – which possesses unique properties that cannot be achieved from inherent properties of concrete. The internal shape, size, and geometry of the material is engineered at mm-cm scales, which enables an auxetic behavior, strain-hardening behavior, etc. This study presents a computational design method that heuristically generates the internal design of a cement-based material for achieving desired mechanical properties.

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