北京地区沥青路面结构内部温度变化规律

为了掌握沥青路面温度变化规律,更加准确地指导沥青路面设计和对沥青路面病害的分析,选择北京地区某高速公路沥青路面,在路面结构内部埋设了温度测试设备,对沥青路面结构内部温度进行了跟踪监测和分析,并给出了北京地区路面结构内部温度极值的预测公式.结果表明:北京地区(实验路段中)沥青路面上面层底部全年最高温度为33:8℃,最低温度为-16:8℃.夏季沥青路面结构内部平均温度梯度为0:45℃/cm,冬季为-0:10℃/cm.路面结构内部温度降温速率在农历夏至前后最大,约0:6-1:2℃/h;路面在冬季长时间处于低温状况,降温速率在冬季较小,约0:2-0:4℃/h.北京地区1 a内沥青路面工作温度处于中低温期的时间约占85%左右.

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 below 20℃ is about 85% within a year. A prediction formula of extreme of the internal temperature of the pavement structure was given in the paper.