Effect of Adhesive Thickness and Concrete Strength on FRP-Concrete Bonds
Publication: Journal of Composites for Construction
Volume 16, Issue 6
Abstract
The use of fiber-reinforced polymer (FRP) composites for strengthening, repairing, or rehabilitating concrete structures has become more and more popular in the last 10 years. Irrespective of the type of strengthening used, design is conditioned, among others, by concrete-composite bond failure, normally attributed to stress at the interface between these two materials. Single shear, double shear, and notched beam tests are the bond tests most commonly used by the scientific community to estimate bond strength, effective length, and the bond stress-slip relationship. The present paper discusses the effect of concrete strength and adhesive thickness on the results of beam tests, which reproduce debonding conditions around bending cracks much more accurately. The bond stress-slip relationship was analyzed in a cross section near the inner edge, where stress was observed to concentrate. The ultimate load and the bond stress-slip relationship were visibly affected by concrete strength. Adhesive thickness, in turn, was found to have no significant impact on low-strength concrete but a somewhat greater effect on higher strength materials.
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Acknowledgments
This research was funded by the Instituto Técnico de Materiales y Construcciones (INTEMAC). Special thanks are due to its Central Laboratory staff for their support in the experimental part of this study and to BETAZUL for the FRP material used in this research.
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Information
Published In
Journal of Composites for Construction
Volume 16 • Issue 6 • December 2012
Pages: 705 - 711
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Dec 28, 2011
Accepted: Apr 24, 2012
Published online: Apr 26, 2012
Published in print: Dec 1, 2012
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