Abstract
The bond strength between a carbon-fiber-reinforced polymer (CFRP) plate or sheet and concrete is susceptible to harsh field environments and plays a key role in the strengthening function of CFRP in the externally bonded strengthening technology. In the present study, the influence of outdoor exposure in northeast China, a frigid zone, on the bond behavior between pultruded CFRP plate and concrete block was investigated using a single-lap shear test. The test results indicated that the exposure caused a change in the cohesive failure of concrete to debonding between the concrete and adhesive, similar to water immersion. The fracture energy, maximum shear bond stress and load capacity of the CFRP-concrete bond joint decreased with the exposure time. An environmental reduction factor was proposed to account for the degradation of the CFRP–concrete bond for the investigated exposure.
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