沥青路面Top-Down裂缝产生的原因分析  

Analysis on Cause of Top-Down Cracks of Asphalt Pavement

作　　者：牛力强[1] 

机构地区：[1]山西省交通科学研究院,山西太原030006

出　　处：《筑路机械与施工机械化》2017年第1期69-72,共4页Road Machinery & Construction Mechanization

基　　金：山西省交通建设科技项目(2015-1-21)

摘　　要：为深入了解Top-Down裂缝病害成因机理,以某高速公路发生的裂缝病害为例,通过路面结构力学分析认为交通荷载作用不是造成沥青路面自上而下开裂的主要原因,通过路面温度场实测、沥青老化试验、不同老化程度沥青混合料的低温弯曲应变和弯曲劲度模量分析,认为温度疲劳作用是造成沥青路面自上而下开裂的主要原因,沥青路面表面的拉应力则加剧了这种开裂。In order to understand the cause of the top-down crack disease,an expressway was taken as an example.The mechanical analysis of pavement structure shows that the traffic load is not the main reason that causes the asphalt pavement cracking from top to bottom.Temperature field test,asphalt aging test,low-temperature bending strain and bending stiffness modulus of asphalt mixture with different degrees of aging were conducted.The results show that the temperature fatigue is the main reason for the cracking of asphalt pavement from top to bottom,and the tensile stress on the surface makes it exacerbated.

关 键 词：沥青路面 自上而下裂缝 温度疲劳 低温缩裂 

分 类 号：U416.21[交通运输工程—道路与铁道工程]