Effects of Surface Preparation Method on FRP-Concrete Bond Strength under Alkaline Conditions
Publication: Journal of Composites for Construction
Volume 21, Issue 4
Abstract
Despite their advantage of creating stronger fiber-reinforced polymer (FRP)-concrete bonds, methods such as the externally bonded reinforcement (EBR) often pose the serious problem of premature debonding of FRP sheets off the concrete substrate. Externally bonded reinforcement on grooves (EBROG) has been recently introduced as a more efficient alternative to combat such drawbacks by either delaying or totally eliminating the debonding of FRP sheets off the concrete substrate under normal conditions. However, the impacts of adverse environmental conditions on FRP-concrete bond strength have not ever been investigated in FRP-concrete bond through EBROG technique. This study was especially designed to investigate the effects of environmental conditions, including three alkaline solutions at temperatures of 23, 40, and 60°C on FRP-concrete bond strength. For the purposes of this study, specimens were strengthened with either the EBR or the EBROG method. Both types of specimens were subsequently maintained in the experimental alkaline conditions for 3,000 h. Single-shear tests were conducted to evaluate the FRP-concrete bond behavior using the particle image velocimetry technique. Experimental results showed that the specimens strengthened by the EBROG method and subjected to the adverse conditions of an alkaline environment resisted higher bond loads by up to 50% their ultimate bond loads compared to those strengthened via the EBR method.
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Journal of Composites for Construction
Volume 21 • Issue 4 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Aug 1, 2016
Accepted: Oct 12, 2016
Published online: Feb 8, 2017
Discussion open until: Jul 8, 2017
Published in print: Aug 1, 2017
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