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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: Bond and Creep Characteristics of Coated Reinforcing Bars in Concrete
Author(s): James R. Clifton and Robert G. Mathey
Publication: Journal Proceedings
Appears on pages(s): 288-293
Keywords: bonding; creep tests, epoxy resins; organic coatings; polyvinyl chloride;pullout tests; reinforced concrete; reinforcing steels.
Abstract:Organic coatings are used to protect reinforcing bars embedded in concrete from corrosion. An important consideration in the use of coated reinforcing bars is the effect of the coafing on the strength of the bond formed between reinforcing bars and concrete. In this paper the effects of nine epoxy coatings and one polyvinyl chloride coating on the bond characteristics of reinforcing bars are discussed. The bond properties were determined by carrying out pullout and creep tests. In the pullout tests, increasingly higher Ioak were applied to reinforcing bars embedded in concrete until the bond strength between the bar and concrete was exceeded. In the creep tests reinforcing bars were subjected to tensile stresses of either 15,000 psi (103 MPa) or 30,000 psi (206 MPa) and their slips were measured for two years. Resufts of ihe pullout studies are compared with those of the creep studies on the basis of pullout bond stress ratios (BR) and creep ratios (CR).
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