PCCP Mortar Protection Layer Research Progress

Prestressed steel cylinder concrete pipe (PCCP) has the characteristics of high strength, excellent impermeability, strong sealing and easy installation, and has become an irreplaceable first choice pipe in China's long-distance water diversion project. However, in the process of using PCCP, there will be pipe bursts and other phenomena, most of which are caused by the broken wire of the prestressed steel wire, and the most important function of the protective layer of PCCP mortar is to protect the prestressed steel wire. In this paper, the research progress of PCCP by scholars at home and abroad is reviewed from five aspects: PCCP working environment, mortar mechanical properties, mortar durability, mortar thickness and mortar curing. as well as testing the durability of the mortar through different solution environments; The research prospect of the production of PCCP mortar protective layer, the detection of PCCP mortar protective layer, and the monitoring of PCCP mortar protective layer were carried out, which provided reference enlightenment for the development of PCCP mortar protective layer.