Fiber Reinforced Polymer Composites (FRP or composite material for short) is a composite material formed by winding, molding, or pultrusion of Reinforced Fiber materials (Glass Fiber, Carbon Fiber, Aramid Fiber, etc.) and matrix materials. FRP pultrusion profiles are the long FRP products produced continuously by the pultrusion process.
FRP can be divided into many types according to different fibers and matrix materials. Although their properties vary, they are generally characterized by lightweight and high strength and have considerable advantages in construction, transportation, manufacturing, and other fields.
The application history of FRP in the field of civil engineering is relatively short. The existing studies have shown that the mechanical properties of FRP will decrease to varying degrees under long-term environmental action. Therefore, the study on the durability of FRP will directly affect the design and use of FRP, and also has important significance for the future promotion of FRP materials. Civil engineering structures often have a design service life of decades, while the durability test of FRP in a laboratory environment can only last for tens of months. Therefore, to test the durability of FRP, accelerated aging tests are often carried out within a limited time in the experimental laboratory to simulate the FRP performance over several decades. Factors such as wind and rain in nature play a decisive role in the aging of FRP, including water immersion/moisture, alkali immersion solution, acid immersion solution, high/low temperature, ultraviolet radiation, freeze-thaw cycle, dry-wet cycle, and their combination.