Sessions & Events

 

All sessions and events take place in Central Daylight Time (CDT).
All events take place at the Hyatt Regency New Orleans.

On-demand sessions will be available for viewing in the convention platform/event app 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.


Fiber Reinforced Concrete and Ultra High Performance Concrete for Durable Structures - Case Studies

Sunday, March 24, 2024  3:30 PM - 5:30 PM, Strand 10A

Fiber reinforcement is the most effective way of improving the resistance of concrete to cracking, but little is known of the benefits of fiber reinforcement on long term durability. The purpose of this session is to bring together experts from around the world to discuss case studies where fiber reinforcement enhanced long term durability, to learn from real life situations and to lay the foundation for Life Cycle Engineering Analysis with fiber reinforced concrete. Presentation topics will be related to the benefits of using fibers to enhance long term performance of concrete with and without conventional reinforcement. Case studies where fiber reinforced concrete (FRC), or ultra high-performance concrete (UHPC) were used for durable structures covering a broad range of applications around the world will be presented. Contractors, material suppliers, engineers, architects, researchers, and scientists will benefit from this session.

Learning Objectives:
(1) Identify opportunities to promote and expand the use of FRC and UHPC to support sustainable development;
(2) Recognize the advantages of using FRC and UHPC for various applications;
(3) Discuss the benefits of using FRC and UHPC to enhance long term performance compared with concrete with and without conventional reinforcement;
(4) Reference real life situations to lay the foundation for Life Cycle Engineering Analysis with FRC and UHPC.

This session has been approved by AIA and ICC for 2 PDHs (0.2 CEUs). Please note: You must attend the live session for the entire duration to receive credit. On-demand sessions do not qualify for PDH/CEU credit.


Implementation of UHPC Decked Beam in Ontario, Canada

Presented By: Philip Loh
Affiliation: Facca Incorporated
Description: This presentation will look at the design, fabrication and experimental verification of the UHPC Decked I Beam for bridge girders. As part of the Prestressed/Precast Concrete Institute’s (PCI) study on the implementation of UHPC in precast long span structural elements in buildings and bridges, and due to lack of UHPC structural design codes, there is a need to perform experimental structural evaluation of these precast structural elements, including small scale specimens and full scale 15-m beam. The experimental findings and comparisons with design codes, as well as the environmental impact comparisons with conventional concrete and structural steel bridge girders will be presented.


Performance Review of High Performance Fiber Reinforced Concrete

Presented By: Nicolas Ginouse
Affiliation: Lafarge Canada Inc
Description: The demand for sustainable, durable and resilient infrastructures has never been as important as of today to ensure progress and growth of our modern society as well meeting our long term sustainability goals. The presentation will focus on actual durability and mechanical performances obtained during the production of high performance fiber reinforced concrete for heavy infrastructure projects. Some mix design aspects as well as critical production and quality control protocols to achieve consistent high performance results will be discussed.


Case Studies: Twisted Steel Micro Reinforcement in Structural Walls and Foundations

Presented By: Luke Pinkerton
Affiliation: Helix Steel
Description: Twisted steel micro reinforcement has been successfully applied by Helix Steel in tens of thousands of structural elements over the last two decades, by using a simple elastic design approach based on a nearly forgotten chapter of ACI 318 for mild structural applications. The approach, outlined in ICC-ES AC 470, leverages these easy to understand concepts together with performance testing to deliver safe and effective designs for mild structural elements including structural slabs on ground, foundations, walls and composite metal deck. We will review the designs and results of applications in 1) above grade walls subjected to high wind loads 2) basement walls subject to saturated soil loads, 3) column and strip footings and 4) composite slab on metal decks. Learning Objectives: 1. Understand the simplicity, utility and limitations of linear elastic design approaches currently available in ACI codes 2. Learn how to apply research reports to demonstrate code compliance through IBC/IRC 104.11 3. Understand design in real word applications in above/below grade walls, footings, and slabs on metal deck 4. Describe the value of the elastic design approach in real word applications in above/below grade walls, footings, and slabs on metal deck


Field Implementation of Ultra-High-Performance Concrete in Bridge Rehabilitation Projects in Maricopa County

Presented By: Barzin Mobasher
Affiliation: Arizona State University
Description: Use of Ultra-high-performance concrete, (UHPC) in transportation infrastructure is a major breakthrough due to its excellent mechanical performance and enhanced durability in comparison to conventional concrete. UHPC is chosen for the increased load-carrying capacity, high ductility, and to enhance the corrosion, creep, fatigue, and cracking resistance of newly designed as well as to repair aging and deteriorating bridges. While bridge decks, girders, or other cast-in-place or precast components can be developed, UHPC innovations in bridge design have further advanced its use as the shear connectors, repair material, or as ductile and impact absorbent materials in parts of bridge components. We present the results of an ongoing project supported by MDOT (2022-2023) in the use of non-proprietary, sustainable UHPC mixtures that incorporate locally sourced cement replacement and filler materials. Using this approach, significant cost reduction (of the order of >70% compared to proprietary mixtures) was achieved. The main aspects of a successful UHPC mixture design are dense particle packing to reduce the porosity in the binder phase, low water content, chemical synergy in the use of cement replacement materials, and the use of fiber reinforcement. Thus the strength, ductility, and durability of structural elements are significantly improved. The mix design developed at ASU was transferred to a trial stage of the mockup testing, and batching plans of large volumes for connection pours were developed. Training of the construction crew led to the competency of the workforce in implementing this new application. The first UHPC bridge project in the state of Arizona used the approved mix design in the reconstruction of Palo Verde Rd bridge in Buckeye, Arizona. Design tools to enable application of UHPC for full-scale structural elements were also developed. Material properties from mechanical testing were used to predict the structural response of UHPC connection pours.


Applications of Architectural UHPC in USA Building Façades

Presented By: George Quercia
Affiliation: TAKTL LLC
Description: Ultra-High-Performance Concrete (UHPC) offers new capabilities for structural and aesthetic concrete for architectural applications in building design. Composite architectural UHPC is over four times as strong as traditional pre-cast concrete and performs exceptionally well in demanding environmental conditions. Its strength is attributed to the carefully calibrated ratio of engineered ingredients and a mixing sequence that packs molecules together closely and creates very tight bonds. The material’s high packing density combined with fiber reinforcement (both discrete fibers and mesh) yields excellent flexural and compressive strength and virtually eliminates the capillary pores that cause freeze-thaw degradation in other cement-based products. Its distinct material properties provide opportunities for greater spans, thinner profiles, more complex geometries, and higher performance in extreme climates than other glass fiber reinforced concretes (GFRC), terracotta, and metal-reinforced precast concrete products, while maintaining competitive installation costs. This presentation will cover composite Architectural UHPC (A|UHPC) panels and component material properties, ongoing code developments, and a summary of the most important projects of more than 400 completed in USA since 2012.


Repair and Retrofit of Earthquake Damaged Middle School with FRCM: A Case Study

Presented By: Aniket Borwankar
Affiliation: Simpson Strong-Tie
Description: Gruening Middle School, located in Eagle River, Alaska, was significantly damaged during a magnitude 7.1 earthquake on November 30, 2018. Gruening was shut down for almost three years. Engineers first evaluated Gruening on Sunday, December 2, 2018, and the building was red-tagged per ATC-20-1 Field Manual – Postearthquake Safety Evaluation of Buildings (ATC-20). Design began on the Gruening Middle School Earthquake Recovery Project in spring 2019. Engineers referenced ASCE 41 and ASCE 7 for structural design. As part of this project, engineers reviewed the existing CMU walls compared to current design and detailing standards. In collaboration with Simpson engineers, Reid Middleton and ASD elected to use FRCM on all existing CMU walls in the building. The use of FRCM accomplished two objectives: upgrading existing stack bond CMU walls to meet current MSJC requirements and strengthening tall walls to meet out-of-plane capacity requirements. FRCM combines a high-performance mortar with a carbon-fiber grid to create a thin structural layer that does not add significant weight to the project. Reid Middleton and the Simpson team worked closely during the design and construction phases to ensure a smooth installation. With close collaboration between the contractor, Simpson, and the engineer, the FRCM installers could place the FRCM ahead of schedule. The installers covered approximately 36,000 square feet of wall with FRCM per the structural drawings and increased the resiliency of the existing structure for future events.

Upper Level Sponsors

ACI Northern California and Western Nevada Chapter
Baker
Conseal
Euclid Chemical
FullForce Solutions
Master Builders
Natural Resources Research Institute - University of Minnesota
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