Research Status Review of Water Stability for Polyurethane Mixtures

In order to meet the diverse needs of pavement engineering for green, durability and functional improvement, in recent years, the application of polyurethane mixture in pavement engineering has received extensive attention. Through investigating the current research status of polyurethane mixture, this paper focuses on summarizing the research result in the field of water stability, while presenting the problems of current research and proposing feasible research directions. The results show that: polyurethane has greatly improved the road performance of asphalt mixtures. The water stability of polyurethane mixture is generally poor, but there is still lack of research on water damage mechanism of polyurethane mixture. The lack of water stability is the key problem restricting the application of polyurethane mixture.