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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.
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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.
Title: Effect of Environmental Conditions on Bond Strength between CFRP Laminate and Concrete Substrate
Author(s): J.J. Myers and M. Ekenel
Publication: Special Publication
Appears on pages(s): 1571-1592
Keywords: bond strength; CFRP strengthening; durability; frost effect;moisture; temperature
Abstract:Limited information is known about the effects of environmental conditionsduring installation on quality and performance of the bond between carbon fiberreinforced polymer (CFRP) reinforcement and substrate material. This research studyinvestigates the effect of surface moisture, relative humidity and temperature on thebond strength between concrete and CFRP reinforcement. Three test methods includinga surface pull-off bond test, a surface shear-torsion bond test, and a flexural test wereused to evaluate the bond performance of the FRP fabric under various installationconditions. Test results revealed that the high surface moisture content, extremehumidity and extreme low temperature can be detrimental to bond strength. Althoughthe high temperature improved the bond strength, it is not recommended because ofdecreased set-time and saturant workability. Based on the results presented in thispaper, a maximum allowable limit on surface moisture content, relative humidity, andtemperature of 4.3%, 82%, and 90oF, respectively, at installation is recommended.
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