Tensile Bond Strength of Post-Installed Epoxy-Coated Reinforcing Bars
Publication: Journal of Bridge Engineering
Volume 26, Issue 2
Abstract
Post-installed reinforcing bars are often used to connect new concrete elements to existing concrete structures. Bridge designers frequently specify post-installed epoxy-coated reinforcing bars in anchorage applications due to their potential corrosion resistance compared to uncoated reinforcing bars. However, chemical adhesive manufacturers only publish the tensile bond strength of uncoated reinforcing bars post-installed with their products. This research examined what effects the epoxy coating had on the tensile bond strength and directly compared the results for epoxy-coated and uncoated reinforcing bars. Forty-eight confined pullout tests were conducted in uncracked concrete to promote bond failure. Bond failure was at the concrete/adhesive interface for epoxy-coated reinforcing bars and at the steel/adhesive interface for uncoated reinforcing bars. The ratio of the tensile bond strengths of epoxy-coated to uncoated reinforcing bars ranged from 0.94 to 1.04 and varied based on the chemical adhesive. A potential coating factor for use when calculating the nominal tensile bond strength of a post-installed epoxy-coated reinforcing bar is discussed.
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References
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 26 • Issue 2 • February 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Apr 21, 2020
Accepted: Sep 12, 2020
Published online: Dec 2, 2020
Published in print: Feb 1, 2021
Discussion open until: May 2, 2021
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