Research Article
Jan 1976
Bond of Coated Reinforcing Bars in Concrete
Authors: Robert G. Mathey, M.ASCE, and James R. CliftonAuthor Affiliations
Publication: Journal of the Structural Division
Volume 102, Issue 1
Abstract
The bond strengths were determined for 23 epoxy-coated (10 different epoxy coatings), six polyvinyl chloride-coated (three different coating materials), and five uncoated reinforcing bars. The length of embedment of the reinforcing bar in the concrete was 12 in. (305 mm). The loads or bond stresses corresponding to a loaded-end slip of 0.01 in. (0.25 mm) or a free-end slip of 0.002 in. (0.051 mm) were considered as critical values in determining the bond strength, depending on which of these values of slip developed first. For coating film thicknesses ranging from 0.001 in. to 0.011 in., the epoxy-coated bars developed bond strengths essentially equal to the bond strengths for uncoated bars. Experimental values were higher than minimum acceptable values in building code and highway bridge requirements. Bond strengths of the polyvinyl chloride-coated bars and bars with thick epoxy coatings were unacceptable.
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Information
Published In
Journal of the Structural Division
Volume 102 • Issue 1 • January 1976
Pages: 215 - 229
Copyright
© 1976 American Society of Civil Engineers.
History
Published in print: Jan 1976
Published online: Feb 1, 2021
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Authors
Affiliations
Robert G. Mathey, M.ASCE
Asst. Chf. Materials and Composites Section, Center for Building Tech., NBS, Washington, D.C.
James R. Clifton
Research Chemist; Materials and Composites Section, Center for Building Tech., NBS, Washington, D.C.
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