Shear-Bond Behavior of the Interface between FRP Profiles and Concrete by the Double-Lap Push Shear Method
Publication: Journal of Composites for Construction
Volume 21, Issue 4
Abstract
This paper focuses on the bonding performance of the interface between fiber-reinforced polymer (FRP) profiles and concrete. The bond shear capacity and the bond shear strength of the wet-bond (WB) interface, the shear-key (SK) interface, and the shear-key combined with wet-bond (SK-WB) interface were investigated via double-lap push shear tests with 15 specimens. Varying numbers of shear keys were adopted in the SK and SK-WB specimens to study the influence of the bonding area of the shear keys. The slip between the FRP profiles and the concrete was measured, and the bond stresses at different points of the test zone were calculated with differential operations. The results show that the average bond strength and the maximum slip of the SK-WB interface are significantly higher than those of the SK interface, whereas the average bond strength and maximum slip of the SK interface are significantly higher than those of the WB interface. A much greater concentration of stress was discovered in the SK interface compared with the SK-WB interface. The capacity load value and the maximum slip value of the double-SK interface are higher than those same values of the single-SK interface. The comparison of bond strength was performed between the FRP profiles-concrete interface and the FRP plate-concrete interface. The results show that the bond strength of the WB interface between the concrete and the FRP profile by the double-lap push shear method is much lower than the bond strength of the WB interface between the concrete and the FRP plate when using the double-lap pull shear method. Finally, the significant difference in the bond strengths is explained using the stress analysis method.
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Acknowledgments
The research was funded by the financial support from the General Program of China Postdoctoral Science Foundation (2013M541994), the National Natural Science Foundation of China (51508519), the Outstanding Young Talent Research Fund of Zhengzhou University (1521322001), the China Scholarship Council (CSC) Foundation (201408410129), and the key scientific research projects of Henan Province for colleges and universities (14B560014, 15A560040).
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Published In
Journal of Composites for Construction
Volume 21 • Issue 4 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jun 23, 2016
Accepted: Nov 1, 2016
Published online: Feb 13, 2017
Discussion open until: Jul 13, 2017
Published in print: Aug 1, 2017
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