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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 958 Abstracts search results
Document:
SP365_08
Date:
March 1, 2025
Author(s):
Taylor Brodbeck, Giorgio T. Proestos, and Rudolf Seracino
Publication:
Symposium Papers
Volume:
365
Abstract:
As glass fiber-reinforced polymer (GFRP) reinforcing bars become more widely used, there is a need to better understand the behavior of GFRP reinforced members. GFRP reinforced deep beams are one example of concrete members that are not currently well understood. Besides the linear elastic behavior of GFRP material, another significant difference between GFRP and steel reinforcement is the difference in surface treatment. While deformation requirements are prescribed for steel reinforcing bars, FRP bars may have different surface treatments depending on the manufacturer. The different surface treatments lead to different bond characteristics and, ultimately, a difference in performance. This research explores the effect of bond through both an analytical study using VecTor2 and a series of large-scale deep beam tests reinforced with GFRP bars. Analytically, VecTor2 was able to capture the behavior of published experiments from the literature, reinforced with sand-coated GFRP bars. An alternative surface preparation consisting of machined indentations was introduced as a parameter in this study, resulting in significant changes in the performance and behavior of the deep beams. VecTor2 was also able to capture the behavior of these beams when adjustments were made to the bond model to match the observations of the experiments.
DOI:
10.14359/51746688
CI4610Yamin
October 1, 2024
Joseph L. Yamin and Daniel T. Millman
Concrete International
46
Issue:
10
Near-surface-mounted (NSM) reinforcement can be used for strengthening of concrete members without extensive demolition of concrete sections. The article offers a historical review of this strengthening method and discusses its basic mechanics and design considerations, as well as projects where NSM was used for flexural strengthening of bridge elements.
CI4610Thiel
Charles C. Thiel Jr. and K. Dirk Bondy
All new parking structures in California are required to be wired for photovoltaic installations, resulting in conduit requirements that are excessive for some slabs. These conditions can seriously impair the structural load path and create an unanticipated structural hazard. The California State University (CSU) system’s Seismic Review Board developed interim conduit placement requirements for CSU projects.
CI4609TechSpotlightAquajet
September 1, 2024
9
While it might seem that hydrodemolition is only appropriate for big projects, it can also be an economical choice for compact applications, such as the renovation of a residential garage floor. The floor had heavy damage that required recasting with new concrete. The floor was diamond ground, so the hydrodemolition method was well-suited to create a rough, consistent bonding surface for the new concrete.
SP-363-4
July 1, 2024
Naveen Saladi, Chandni Balachandran, Robert Spragg, Zachary Haber, and Benjamin Graybeal
363
Corrosion of steel reinforcement is one of the primary contributing factors to bridge deck deterioration. Based on the extent of corrosion, different corrosion mitigation strategies can be used to extend the service life of a bridge deck. Bridge deck overlays are efficient tools in reducing active corrosion. While there are multiple overlay solutions that are commonly deployed, including concrete-based and polymer-based systems, ultra-high performance concrete (UHPC) overlays have gained interest from bridge owners in recent years. Another corrosion mitigation strategy is the application of corrosion-inhibiting chemicals and sealers to a concrete surface to reduce the ingress of deleterious ions. The purpose of this paper is to compare different corrosion mitigation strategies and study the effects of such techniques on the bond between the UHPC overlay and the substrate concrete. UHPC overlays were found to be effective in reducing corrosion rates by more than 50 percent. Sealers and corrosion inhibitors applied to the concrete substrate in combination with placing a UHPC overlay reduced the corrosion rates even further. However, sealers and corrosion inhibitors appeared to negatively affect bond strength, potentially increasing the likelihood of overlay delamination.
10.14359/51742107
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