摘要
通过实体工程车辙检测,结合典型车辙病害路段芯样抽提筛分试验,进行路面车辙类型判断及成因分析,研究了沥青路面车辙形成机理。研究结果表明,路面失稳性车辙发生在沥青上面层和中面层约10cm深度范围内,LSPM柔性基层未出现车辙;中上面层沥青混合料合成级配偏细,缺少形成骨架嵌挤作用的4.75~9.5mm粗集料,2.36mm以下的细集料过多,且采用高温粘度较小的基质沥青是形成车辙病害的主要因素;高温时在车轮荷载作用下,沥青及沥青胶浆产生流动,使沥青混合料的网络骨架结构失稳。
Based on the rutting test in the field with typical core samples extracted from different cross-sections, rutting type judgment and formation causes were analyzed, and the formation mechanism of asphalt pavement rutting was researched. The results show that the flow deformation at surface layer and mid-surface layer are the main contribution to the rutting, and the influential depth is about 10 cm. The main reasons for the rutting are lacking of gradation from 4.75 mm to 9.5 mm, too much fine aggregate under 2.36 mm and the adoption of matrix asphalt whose viscosity is too low at high temperature. Asphalt-mineral filler mastic, of which the main character is viscous at high temperature, flows when it is subjected to vehicle load, which causes the instability of asphalt mixture.
出处
《筑路机械与施工机械化》
北大核心
2015年第8期63-65,共3页
Road Machinery & Construction Mechanization
关键词
道路工程
沥青路面
车辙
形成机理
road engineering
asphalt pavement
rutting
formation mechanism
