Study on the Cooling Effect of Zeolite Powder to High Viscosity Asphalt Mixture

摘要

Compared with tradition asphalt mixture, the construction temperature of high viscosity asphalt mixture is higher in the tunnel construction. It is necessary to adopt the warm mix technique of adding warm mix additives in high viscosity asphalt. The paper analysis the temperature decrease effect in adding zeolite powder in high viscosity asphalt and the performance of asphalt mixture with zeolite powder additive. The study result shows that the adding 8% of zeolite powder in viscous asphalt can cut viscous asphalt construction temperature of 15°C or so. Air voids as one kind of volume indicators determines the high viscosity asphalt construction temperature, the cooling amplitude rate is 10 ～ 15°C. With the rapid development of China's highway construction, highway tunnels are growing. The tunnel space is narrow and closed so the tunnel ventilation performance is poor during the construction of tunnel. Because the smoke is very difficult to quickly exclude in tunnel and the temperature in tunnel is high in the condition of the asphalt pavement construction, heat and smoke seriously affect the construction personnel's physical health and the quality of tunnel pavement. Based on the above reasons, the paper developed a new kind of asphalt mixture which used the warm mix technique of adding zeolite powder in high viscosity asphalt and the asphalt mixture have very good performance of reducing the mixing temperature and flue gas. From the perspective of personnel physical health considerations, warm mix technique can be greatly improved in the course of construction environment to reduce smoke in the tunnel.