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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 957 Abstracts search results
Document:
CI4610Thiel
Date:
October 1, 2024
Author(s):
Charles C. Thiel Jr. and K. Dirk Bondy
Publication:
Concrete International
Volume:
46
Issue:
10
Abstract:
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.
CI4610Yamin
Joseph L. Yamin and Daniel T. Millman
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.
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
Symposium Papers
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.
DOI:
10.14359/51742107
SP-363-8
Ali Alatify and Yail J. Kim
This paper presents the prediction of bond strength between ultra-high performance concrete (UHPC) and fiber reinforced polymer (FRP) reinforcing bars using an artificial neuronal network (ANN) approach. A large amount of datasets, consisting of 183 test specimens, are collected from literature and an ANN model is trained and validated. The ANN model includes six variable inputs (bar diameter, concrete cover, embedment length, fiber content, concrete strength, and rebar strength) and one output parameter (bond strength). The model performs better than other models excerpted from existing design guidelines and previously published papers. Follow-up studies are expected to examine the individual effects of the predefined input parameters on the bond strength of UHPC interfaced with FRP rebars.
10.14359/51742111
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The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.