Temperature Characteristic of Asphalt Pavement Structure in Beijing Based on Temperature Survey of Test Road

In order to know the law of the temperature change of asphalt pavements,to design and precisely analyze the damaged asphalt pavements,temperature sensors were buried in a certain highway asphalt pavement in Beijing. And the sensors were used to track and analyze the internal temperature changes of the pavement structure. The results show that the temperature at the bottom of the upper surface varies from 33. 8 ℃ to-16. 8 ℃ during a year. The average temperature gradient of the pavement is 0. 45 ℃/cm in summer and-0. 10 ℃/cm in winter. The temperature decreasing rate of the pavement is about 0. 6 -1. 2 ℃/h and the highest temperature decreasing rate occurs around the summer solstice of Chinese lunar calendar. The temperature decreasing rate is smaller than that of other seasons,and the record number is about 0. 2 -0. 4 ℃/h. The working temperature of the asphalt pavement below20 ℃ is about 85% within a year. A prediction formula of extreme of the internal temperature of the pavement structure was given in the paper.