Durability Performance of FRCM Composite Bonded to Concrete under Different Environmental Aging Conditions

From the perspective that an aggressive environment may cause damage to cementitious materials, curing agents of fiber reinforced cementitious matrix (FRCM) composite allows chemical agents to attack the reinforcement fabrics. In such cases, the accelerated interfacial FRCM debonding mechanisms interfere which reduce its mechanical performance. This task was conducted to investigate the long-term durability performance of the FRCM composite. In this study, environmental aging conditions were the freeze-thaw cycles, high humidity cycles, high temperature cycles, immersion into salt solution, and immersion into alkaline solution. Different FRCM reinforcement ratio and two surface roughness of concrete were also included. Two test methods were used to evaluate the FRCM composite's bond performance (pull-off test and bending test). The bending test results revealed that the FRCM composite bond performance was not influenced by the environmental exposure. While the test results for the pull-off strength were scattered, possibly due to the environmental degradation or a lack of proper quality control during the initial FRCM composite application or applying the load.