Bond-Test Protocol for Plate-to-Concrete Interface Involving All Mechanisms
Publication: Journal of Composites for Construction
Volume 20, Issue 1
Abstract
Attaching reinforcing material such as steel or fiber reinforced polymer (FRP) plate to the external face of concrete members is a conventional technology used for strengthening concrete structures. Generally, three mechanisms are involved in the composite action between the concrete and the attachment: adhesion, dowel action, and friction. Methods have been developed for the identification of the interfacial bond properties when only one or two mechanisms exist at the interface. However, the existing methods cannot be used when all three mechanisms coexist. A methodology for testing the bond and the corresponding data interpretation procedure are proposed in this work to identify the bond properties of the interface involving all bonding mechanisms. As the bonding mechanisms are coupled and interact with each other, it is impossible to test all of them individually and separately. The proposed test protocol involves an analytical procedure that decouples individual mechanisms from the global response curves. Furthermore, conventional bond test methods involve extensive and labor-intensive strain gauging as well as complicated data regression analyses of test results in order to obtain the bond properties. The proposed method requires only the simplest instrumentation to measure displacement and load, without strain gauging. Test data processing also involves simple graphical interpretations only, without complicated and tedious mathematical data regression analyses. Therefore, the proposed method has advantages over the existing ones and can be easily adopted in engineering practice.
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Acknowledgments
Students Cheung Wing Chong, Gai Chao, Wong Lai Shan, and Zhao Ming Xin took part in the experimental works. The work described in this paper was fully supported by Research Grant Council, Hong Kong Special Administrative Zone, China (Project No. CityU124113) and the National Natural Science Foundation of China (Grant No. 51378449).
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Journal of Composites for Construction
Volume 20 • Issue 1 • February 2016
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© 2015 American Society of Civil Engineers.
History
Received: Nov 22, 2014
Accepted: Mar 12, 2015
Published online: May 13, 2015
Discussion open until: Oct 13, 2015
Published in print: Feb 1, 2016
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