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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: Static and Fatigue Bond Characteristics of Interfaces between CFRP Sheets and Frost Damage Experienced Concrete
Author(s): J.G. Dai, Y. Saito, T. Ueda, and Y. Sato
Publication: Special Publication
Appears on pages(s): 1515-1530
Keywords: concrete; external bonding; fatigue; frost damage; FRP;relative dynamic elastic modulus
Abstract:Both short and long-term performances of repaired or strengthenedconcrete structures using external FRP bonding are greatly affected by states ofbonding substrates, which are covercrete and may have experienced various damages.One of them is frost damage in cold regions. This paper intends to investigate how theinitial frost damages in concrete influence the static and fatigue bond performances ofCFRP/concrete interfaces. Concrete specimens were exposed to freeze and thaw cyclesbefore being bonded with CFRP sheets. The initial frost damage of concrete wascontrolled approximately at three different levels in terms of its relative dynamicmodulus of elasticity, which was 100% (non frost damage), 85% and 70%, respectively.Test results showed that failure modes of CFRP/concrete bonded joints with initial frostdamage in concrete were the delamination of covercrete. By contrast the joints withoutinitial frost damage failed in a thin concrete layer as usual. Moreover, CFRP/concretejoints with and without initial frost damage showed different manners in their interfacebonding strength and stiffness. If the initial frost damage existed in concrete substratethe effective bond length of CFRP/concrete joints was increased due to the decrease ofthe bonding stiffness and interfacial fracture energy. Fatigue testing results indicatedthat the linear slopes of S-N curves of CFRP/concrete bonded joints were not influencedby the initial frost damage. The initial frost damage did not shorten the fatigue life ofCFRP/concrete joints if a same relative tensile stress level was kept in the FRP sheets,where the relative tensile stress level was defined as a ratio of the applied tensile forcein FRP sheets for the fatigue tests to the maximum static pullout one achieved in eachtest series.
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