Study on Shear Bond Behavior of PUFA-to-Concrete Interface

Polyurethane fly-ash (PUFA) composite material is a new type of reinforcement material. It has the advantages of high strength, light weight, and good adhesion to concrete. It has been applied in bridge reinforcement in recent years. The interfacial adhesion between PUFA and concrete is a key factor in the success or failure of reinforcement. In this paper, the shear-peeling behavior of the interface between PUFA material and concrete is studied experimentally. The test was designed by orthogonal test design method, and the test piece was made into 25 in-plane shear-peeled test pieces. Through the interface shear peel test, the bond strength, and failure mode of PUFA-concrete interface layer structure and in-plane shear were obtained, and the bond slip curve was obtained based on the load slip curve by fitting method. The research results provide a reference for PUFA engineering applications.