Interfacial design and damage of fiber-reinforced polymer composites/strengthening concrete: a review

Fiber-reinforced polymer (FRP) composites are widely used to reinforce and repair buildings due to their high strength, corrosion resistance, lightweight, and convenient of construction. The interfacial properties between FRP and the reinforced buildings play a very important role in the effective transfer of stress and largely determine the service hours of the reinforced structures. Therefore, this paper reviews the research progress on the interfacial properties of FRP reinforced concrete. First, the composition of FRP reinforcement system is introduced. EB-FRP and NSM-FRP reinforcement methods are suitable for reinforcing different buildings. Then, the influence factors of the interfacial properties are highlighted. The choice of interfacial agent, roughness of the reinforced concrete surface, temperature and environment have very important impact on the reinforcement effect. Finally, the main damage modes and failure mechanisms of the interface between FRP and the reinforced concrete are summarized. The choice of the interfacial agent determines the main failure mode. This paper provides a theoretical basis for the further research on the interface damage mechanism of FRP reinforced concrete.