In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
ACI World Headquarters
38800 Country Club Dr.
Farmington Hills, MI
ACI Middle East Regional Office
Second Floor, Office #207
The Offices 2 Building, One Central
Dubai World Trade Center Complex
Phone: +971.4.516.3208 & 3209
ACI Resource Center
Feedback via Email
Home > Education > Free Web Sessions
Browse from hundreds of recorded presentations from ACI Conventions and other concrete industry events.
Fiber Distribution in UHPC Beams: An Insight from 3D Micro-CT Scans on Shear Tests
Presented by: Manuel Bermudez, National Cheng Kung University
Research in Progress (ACI Spring 2023, San Francisco, CA) UHPC's inherent anisotropy has two effects on structural members: fiber orientation and fiber distribution. Both effects are impacted by the casting process and the flow pattern and have repercussions on the tensile response of the UHPC structural element. This study provides insight from micro-CT scans on shear tests of UHPC I-shaped beams with heights ranging from 300 to 1150 mm. The UHPC mix had 1.5% steel fibers and it was randomly poured into the beams. A qualitative analysis of the micro-CT images revealed that the issue of fiber orientation is significantly magnified by the fiber distribution as the beam depth increases. In structural elements subjected to shear loading with no structural redundancy, it is complex to depend on the tensile strength of UHPC as a predictor of shear strength. A shear design equation is proposed based on UHPC's compressive strength which has less variation associated with fiber distribution or orientation.
September 25 - October 1
Tensile Performance of GFRP Bars Connected with FRP Couplers
Presented by: Jenna Hays, Northern Arizona University
Undergraduate Research Session (ACI Spring 2023, San Francisco, CA) Concrete structures serve an important role in society's infrastructure, and they often include steel reinforcement bars that may be connected via steel couplers to increase tensile strength. However, corrosion of the reinforcing steel can cause unwanted cracking and spalling of concrete, deteriorating the structural member. Nonmetallic components such as GFRP bars and FRP couplers present a solution to this corrosion issue. These bars and couplers have been manufactured, but there is insufficient testing data on their performance under tension as well as research on how to best connect the bars and coupler. The objective of this research project was to evaluate the performance of GFRP bars connected with FRP couplers during tensile testing (Fig. 1). A control tensile test was conducted with steel reinforcing bars and a steel coupler to establish a baseline for performance. Connecting GFRP bars with epoxy couplers was also investigated to expand the range of results. The test results fill an important knowledge gap related to the performance of GFRP bars connected with corrosion-resistant couplers that may be used as a suitable replacement for steel in reinforced concrete structures.
Use the below tools to find an education presentation on the topic of interest to you.
SEARCH FOR A PRESENTATION»