紫外光作用下沥青路面的老化与车辙关系分析

Analysis on relationship between asphalt pavement rut and aging under ultraviolet

通过单轴静载蠕变试验获得沥青混合料紫外老化前后的蠕变参数及弹性参数,并据此采用有限元法对沥青路面结构进行了老化前后车辙深度的数值模拟,得出不同加载次数、不同轴载、不同行驶速度下的车辙深度值,进而提出了相应的车辙预估公式。结果表明:紫外光老化使沥青路面材料弹性模量变小以及蠕变参数A和m变大是车辙深度增加的最根本原因,车辙深度随着加载次数的增加呈非线性增长。

Elastic creep parameters of asphalt mixture before and after ultraviolet aging were obtained by a uniaxial static load test,and a finite element simulation on the asphalt pavement rut depth before and after the aging was carried out,Different rut depth values under different driving speed,load and loading speed were obtained,and the corresponding rut forecast formula was put forward. It turns out that ultraviolet light decreases the elasticity modulus of asphalt pavement and increases the creep parameters A and m,which is the fundamental causes of rut deepening. Rut depth increases non-linearly as loading times.