Bond Behavior between NSM CFRP Strips and Concrete Exposed to Elevated Temperature Using Cement-Based and Epoxy Adhesives
Publication: Journal of Composites for Construction
Volume 21, Issue 5
Abstract
The repair and strengthening of existing concrete structures with composite material has become more common during the last decade. The near-surface-mounted (NSM) technique was used in this research, where fiber-reinforced polymer (FRP) laminates were bonded using an epoxy or cement-based adhesive in grooves cut into the concrete surface to study the behavior of the bond between the NSM carbon fiber–reinforced polymer (CFRP) strips and concrete after exposure to heating. Twenty-four heat-damaged concrete prisms were tested using a single-lap shear test. The results were compared with 24 reference specimens without heat damage. The results demonstrate that the residual bond strength after the repair of heat-damaged concrete with CFRP using epoxy adhesive is 94, 79, and 49% for temperature exposure of 1 h at 200, 400, and 600°C, respectively. The corresponding values for 2 h of exposure are 86, 75, and 41%, respectively. However, the residual bond strength after the repair of heat-damaged concrete with CFRP using cement-based adhesive is 91, 79, and 70% for temperature exposure of 1 h at 200, 400, and 600°C, respectively. The corresponding values for 2 h of exposure are 85, 69, and 66%, respectively.
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Acknowledgments
The scholarship support provided to the first author by the Higher Committee for Education Development in Iraq is gratefully acknowledged. The experimental work was carried out at the Smart Structures Laboratory of Swinburne University of Technology. The authors thank the staff of the Smart Structures Laboratory for their assistance.
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©2017 American Society of Civil Engineers.
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Received: Jul 24, 2016
Accepted: Jan 24, 2017
Published online: Apr 12, 2017
Discussion open until: Sep 12, 2017
Published in print: Oct 1, 2017
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