从温度分布频率探讨沥青路面的永久变形

Research on Permanent Deformation of Asphalt Pavement Considering Pavement Temperature Distribution

目前对沥青路面永久变形问题的研究主要集中在高温时的永久变形上,而忽视了中低温度下永久变形的累积.为此,首先以上海市为例分析了部分实测小时路面温度分布情况以及预测全年小时路面温度分布情况;其次,采用沥青路面分析仪(APA),在室内实测了不同温度下沥青混合料的永久变形;最后,分析了温度与永久变形的关系.研究表明,沥青路面50℃以上温度的永久变形所占比例非常少,中低温度下的永久变形是不能忽略的.因此,需要从新的角度去研究沥青路面的永久变形问题.

Permanent deformation of asphalt pavement caused by high temperature instead of the accumulative defomation caused by mid-low temperature attracts more attention. A case study is conducted on the distribution of partial pavement temperature measured hourly in Shanghai. Then, permanent deformation of asphalt mixture at the temperatures ranging from 20 ℃ to 60 ℃were measured in laboratory by asphalt pavement analyzer （APA）; Finally, the relationship between temperatures and pemanent deformation is analyzed. The result indicates that permanent deformation at pavement temperatures above 50 ℃ contributes little to the overall deformation, therefore, permanent deformation at mid-low temperature should not be ignored. Permanent deformation of asphalt pavement is proixosed to study from a new perspective.