Extraction and Analysis of Bond-Slip Characteristics in Deteriorated FRP-to-Concrete Joints Using a Mechanics-Based Approach
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 6
Abstract
Adhesively bonding fiber-reinforced polymer (FRP) composites to reinforced concrete members is a simple and highly effective method to restore strength, increase loading capacities, and extend the service life of structures. With growing demand and wider applications of these strengthening systems, it is their durability that has recently received significant attention from the research community, largely in the form of laboratory testing of deteriorated FRP-to-concrete joints. To develop generalized deterioration factors, a database of shear tests has been collected to quantitatively assess the change in bond characteristics across a number of environmental conditions. It has been identified that a major shortcoming of existing test data is that reporting of the full-range load-displacement behavior is very limited. To supplement existing data, an experimental study is devised to further assess the deterioration of carbon FRP bonded systems under three aqueous conditions. The investigation consists of continually immersing specimens in water, a 5% salt solution, and, for the first time, a sulfuric acid solution of pH 4.0 to simulate the pooling of acid rain. Results show that sulfuric acid attack is most detrimental to the durability of the bond. Then, using a mechanics-based numerical model, bond properties are extracted from the present results as well those in published literature, to determine conservative deterioration factors for the change in bond characteristics with environmental exposure.
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Acknowledgments
The authors would like to acknowledge funding provided by ARC Linkage LP130100482, ARC Discovery DP 140102695, and support from RMIT and Adelaide University to carry out this research.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Apr 25, 2016
Accepted: Nov 3, 2016
Published ahead of print: Jan 30, 2017
Published online: Jan 31, 2017
Published in print: Jun 1, 2017
Discussion open until: Jun 30, 2017
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