热阻式沥青混凝土路用性能及降温效果研究OA

Thermal resistance asphalt pavement can reduce the pavement temperature,but it will have a negative impact on the pavement performance.Therefore,on the basis of using calcined bauxite to prepare thermal resistance asphalt concrete,silicone resin is used to modify calcined bauxite to ensure the road performance of asphalt concrete.The road performance of thermal resistance asphalt concrete is analyzed by rutting test,immersion Marshall test and freeze-thaw splitting test,and the cooling effect of thermal resistance asphalt concrete is determined by testing the thermal conductivity and upper and lower surface temperature of asphalt concrete specimens.The test results show that the addition of calcined bauxite improves the high temperature stability of asphalt concrete,and the silicone resin improves the water stability of calcined bauxite asphalt concrete obviously.Calcined bauxite enlarges the temperature difference between the upper and lower surfaces of asphalt concrete and significantly reduces the thermal conductivity of the specimen.Based on the changes of road performance and cooling effect of thermal resistant asphalt concrete,calcined bauxite is organically modified and the proportion of calcined bauxite instead of natural coarse aggregate is maintained at about 75%,which is more suitable for the use of calcined bauxite in thermal resistant asphalt concrete.