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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: Bending Behavior of Reinforced Concrete Beams Strengthened with Carbon Fiber Reinforced Polymer Laminates and Subjected to Freeze-Thaw Cycles
Author(s): M. del Mar Lopez, A. E. Naaman, and R. D. Till
Publication: Special Publication
Appears on pages(s): 559-576
Keywords: beams; carbon; fiber; freeze-thaw; laminates; plates; polymers; reinforced; ultimate deflection
Abstract:Thirty-six concrete beams strengthened with glued-on CFRP laminates were tested in bending after being subjected to different numbers of freeze-thaw (F.T.) cycles. In order to evaluate a possible deterioration of the interface bond between the concrete and the CFRP laminate, the development length of the glued-on plate was purposely made smaller than the required value. Parameters investigated were: 1) different strengthening systems; 2) precracking of the beams, prior to strengthening; and 3) number of freeze-thaw cycles (0, 100, 200 and 300). For each number of freeze-thaw cycles three control specimens (RC beams with no externally glued-on CFRP laminates) were also tested. It was generally observed that both the moment capacity and the ultimate deflection decreased with an increase in the number of freeze-thaw cycles. The rate of decrease was larger for precracked than for non-precracked beams. For design purposes the value of the horizontal interfacial shear strength can be taken conservatively as 0.17 ÷f’c.
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