减薄高模量沥青路面厚度的可行性分析

Feasibility Analysis on Thickness Reduction of High Modulus Asphalt Pavement

在沥青混合料中添加外掺剂提高沥青路面模量的同时,使建设成本增加,通过减薄沥青层厚度可获得经济效益上的平衡。对比分析了原路面与减薄后的高模量路面在沥青混合料层永久变形量、沥青层底拉应变、无机结合料稳定层层底拉应力及路基顶面竖向压应变四个设计指标下的力学响应。结果表明:减薄后的高模量沥青路面永久变形量降低、疲劳寿命略有提高。

As the additive agent added in the asphalt mixture could improve asphalt pavement modulus,but meanwhile,which will increase the construction cost,and the economic benefit can be balanced by reducing the thickness of asphalt pavement.In this article,through comparison and analysis on the indexes of mechanical response of the original road surface and high modulus of pavement after thickness reduction,including the permanent deformation of asphalt mixture layer,tensile strain of asphalt layer bottom,inorganic binder stability layer upon layer bottom tensile stress and vertical compressive strain at the top of the subgrade,the results have shown that after thickness reduction,the permanent deformation of high modulus asphalt pavement has been decreased and the fatigue life has been increased slightly.