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Home > Publications > International Concrete Abstracts Portal
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.
Showing 1-5 of 896 Abstracts search results
The use of Fiber-reinforced polymer (FRP) composite materials in new construction and repair of concrete structures has been growing rapidly in recent years. FRP provides options and benefits not available using traditional materials. The promise of FRP materials lies in their high-strength, lightweight, noncorrosive, nonconducting, and nonmagnetic properties. ACI Committee 440 has published several guides providing recommendations for the use of FRP materials based on available test data, technical reports, and field applications. The aim of these document is to help practitioners implement FRP technology while providing testimony that design and construction with FRP materials systems is rapidly moving from emerging to mainstream technology.
July 6, 2018
Editor: Raafat El-Hacha
July 1, 2018
Alfredo (Al) E. Bustamante and Jared Wright
This article summarizes an investigation into cracking of load-bearing concrete columns in a precast concrete parking structure. The test program, cause of the cracking, specified repairs, and recommendations for monitoring and maintenance are described.
Griffith Shapack, Zachary Van Brunt, Rudolf Seracino, Gregory Lucier, Sami Rizkalla, and Mohammad Pour-Ghaz
Steel prestressed cored slab superstructures are a common structural system for multi-span bridges in coastal North Carolina. However, due to the aggressive marine environment several such bridges are in need of major repairs or replacement after being in service for little more than 40 years. To address this issue two research projects were undertaken in parallel. The first project involved a critical assessment of non-destructive evaluation techniques in an attempt to predict the extent of corrosion deterioration and hence, the residual strength of cored slabs from existing bridges. Twelve cored slabs taken from two in-service bridges scheduled for superstructure replacement were tested to failure in the laboratory to validate residual strength predictions. The second project involved the design, manufacture and testing of a full-scale CFRP prestressed cored slab reinforced with GFRP
stirrups, and a typical steel prestressed cored slab control specimen. The results of the destructive laboratory testing
enabled validation of the prediction of the flexural performance and strength of CFRP prestressed cored slabs
relative to existing design recommendations. Direct comparison to the new steel prestressed control cored slab and
similar existing cored slabs with varying degrees of deterioration from the first the research project was also
June 18, 2018
Lawrence C. Bank, Ardavan Yazdanbakhsh, Ali Hamidi, Stefanie Reichman, Minhui Weng and Chen Chen
Coarse recycled concrete aggregate (RCA) has been studied as a replacement for natural aggregate (NA) in concrete for decades. RCA is still predominantly used in non-structural applications such as filler, road sub-base, drainage material, and low quality concrete. However, there is increased interest in using RCA in new structural concrete due to restrictions on landfilling of construction and demolition (C&D) waste and on the scarcity of natural aggregates, especially in urban megacities. The compressive strength of concrete with coarse RCA is typically 15–30% less than that with NA. This feasibility study was conducted to evaluate the effect of FRP strengthening on RCA
beams as compared with NA beams also strengthened with FRP. Four RCA and four NA beams were strengthened in flexure and in shear using hand laid-up carbon-epoxy FRP materials. A combination of longitudinal strips on the beam soffit and intermittent closed hoop wraps along the length were used. The FRP-strengthened beams were designed to yield and then fail in compression with the FRP still attached. The results of the testing are described. The ability of FRP strengthening to, (1) change the failure mode of RCA beams, and, (2) to improve the reliability of RCA concrete beams constructed or repaired with FRP materials is discussed. It was found, surprisingly, that the
FRP-strengthening was effective in increasing the capacity of the RCA beams. This is attributed to a different failure
mechanism of the RCA beams from that of the NA beams tested.
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