Abstract:Improvement of snow and ice melting capacity is an important means to ensure driving safety in winter..Phase change asphalt pavement has a wide prospect as an environment-friendly technology. In order to determine whether melting ice and snow of phase change asphalt mixture has practical application value, this paper observed the phase change process of solid solid phase change materials through a microscope, and measured the relevant thermodynamic parameters. The pavement performance of phase change asphalt mixture was tested, and three evaluation methods for melting snow and ice were developed.The results show that the solid-solid phase change materials underwent the mutual transformation of crystalline and amorphous states. The difference between the melting enthalpy values in the heat absorption and heat release process was small, both exceeding 70J/g, and the 50 times decay rate was 2.8%, which can meet the long-term use needs of asphalt pavement; With the increase of the amount of phase change material, the high temperature stability of asphalt mixture decreased, the low temperature crack resistance improved, and the resistance to water damage firstly increased and then decreased, but all of them can meet the requirements of the specification. Only when the amount of phase change material exceeded 0.3%, can it have an obvious ice snow melting effect.It can be seen that solid-solid phase change material can be added to asphalt mixture as an additive. Based on road performance, 0.3%~0.5% of phase change material is appropriate. Phase change asphalt mixture is not suitable for areas where the temperature is lower than 0 ℃ all day, and other snow and ice removal measures need to be combined to ensure road traffic capacity.