Shear Capacity Comparison of Four Different Composite Interfaces between FRP Plates and Concrete Substrate
Publication: Journal of Composites for Construction
Volume 20, Issue 4
Abstract
The mechanical performance of four types of interfaces between fiber-reinforced polymer (FRP) plate and concrete was compared by double-lap-shear test. The study found that the failure characteristics of the four interfaces are obviously distinct. Among them, the shear capacity load of the shear key combined with wet-bond (SK-WB) interface was the highest, followed by the dry-bond and the coarse-aggregate-coating (CAC) interfaces; the wet-bond interface had the lowest shear load bearing capacity. The type of the resin used for the wet-bond adhesive has a slight influence on the bond strength, whereas the type of the resin used for the shear key bonding has a much more significant effect on the shear capacity load of these interfaces. The thickness of the wet-bond epoxy resin layer also has a significant impact on the bond performance of the wet-bond interface. The shear key forms has less influence when the flexural stiffness of the shear keys itself is sufficient; the load capacity of the SK-WB interface is often dependent on the bonding area between the shear key and the concrete. The concept of bond zone was put out when creating interface model of the SK-WB interface. Finally, unified form formulas of the shear capacity and the interface fracture energy are provided for the different interfaces, and the values of them are estimated.
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Acknowledgments
The authors would like to thank the financial support from the National Program on Key Basic Research Project of China (No. 2012CB026200), the National High Technology Research and Development Program of China (No. 2012AA03A204), the General Program of China Postdoctoral Science Foundation (No. 2013M541994), the National Natural Science Foundation of China (No. 51508519), and the China scholarship Council (CSC) Foundation, (No. 201408410129).
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Published In
Journal of Composites for Construction
Volume 20 • Issue 4 • August 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jul 30, 2015
Accepted: Oct 29, 2015
Published online: Jan 11, 2016
Discussion open until: Jun 11, 2016
Published in print: Aug 1, 2016
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