Abstract
This paper presents the results of an investigation into the effects of wet/dry (W/D) cycling on the bond performance of carbon fiber reinforced polymer (CFRP)-concrete interfaces subjected to low-cycle fatigue loading. CFRP-concrete specimens were subjected to fatigue loading, W/D cycling and single shear tests. The bond characteristics were evaluated using a generalized approach based on single shear test results. Control specimens exhibited cohesive failure within the concrete, while fatigue loading and W/D cycling led to a mixed failure pattern featuring a combination of cohesive and adhesive failure. Fatigue loading reduces the local bond strength while inducing little change in the fracture energy. Following fatigue loading, exposure to W/D cycling improves the local bond strength and the fracture energy. Compared to control specimens, the effective bond length becomes higher for CFRP-concrete interfaces after fatigue loading and W/D cycling. Besides, it can be found that the use of piezoelectric transducers (PZTs) allowed the monitoring of the interfacial damage that occurred during fatigue loading and single shear tests.
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