Abstract:In order to explore the influence of ambient temperature and thermal property parameters of asphalt materials on the temperature field of pavement structure, four kinds of high temperature conditions are selected to simulate the temperature field of asphalt pavement, and the temperature changes of each structural layer of pavement under the different high temperature conditions and the thermal property parameters of different materials are analyzed. The main conclusions are that the temperature of pavement structure increases with the increase of ambient temperature, but the growth rate decreases gradually along the depth direction. The temperature within 0~1 m below the road surface is greatly affected by the ambient temperature, and the influence within 1~3 m decreases. The temperature change law of each surface layer structure is basically similar to the ambient temperature, and there is a maximum temperature lag phenomenon. The middle surface layer lags about 1h, and the lower surface layer lags about 3 h. By reducing the solar radiation absorption rate of pavement materials, the pavement temperature can be significantly reduced. The specific heat capacity and thermal conductivity of the upper layer material have a significant effect on the overall temperature of the structure.
