Effects of freeze-thaw cycles on interfacial bonding property of CFRP-sintered clay brick

In order to investigate the effects of freeze-thaw cycles on the interface bonding performance of carbon fiber reinforced polymer composite(CFRP)-sintered clay brick, a single-sided shear test was conducted on the test specimens after different times of freeze-thaw cycles by simulating the natural freeze-thaw environment. The test results show that under the action of freeze-thaw cycles, the bond performance of the CFRP-sintered clay brick has been obviously degraded. Therefore, as the number of freeze-thaw cycles increases, the interface bearing capacity and shear stress continuously decrease. The distribution of the interface shear stress under different freeze-thaw times is similar, and they all show that the shear stress gradually passes from the loading end to the free end, while the effective transfer length doesn’t change significantly. Based on the existing interface theory, the interface bond-slip model considering the freeze-thaw cycles was proposed according to the experiment. Through contrast analysis, the model can well reflect the degradation law of the interface bond performance under the action of freeze-thaw cycles.