Interfacial tensile bond behavior of permeable polymer mortar to concrete

Abstract

Permeable polymer mortar (PPM), in combination with high-strength stainless steel wire mesh, can be widely used to reinforce and repair concrete structures. However, debonding failure of reinforcing layer is one of the major failure modes for these reinforced structures. Therefore, a systematic study on the interfacial tensile bond behavior of PPM to concrete was conducted, and the impact factors of bond strength were explored through the tensile bond strength (TBS) test. Results indicate that curing time, interface roughness, strength of concrete and mortar, and repair position are the major impact factors of bond behavior. The bond failure modes differ if the strength ratio of concrete and mortar, interface roughness, and repair positions are different. Calculation formulas for TBS are proposed in this paper based on the test data.