高速公路沥青路面高温车辙的调查与试验分析

Investigation and Test of Expressway Asphalt Pavement High-temperature Performance

高速公路沥青路面的车辙是路面主要病害之一,通过对某一高速公路沥青路面的调查与室内试验分析,对车辙发生的规律和时间进行了分析与研究。调查分析结果表明,沥青路面不同层位的车辙贡献量也不同,不同表面层在相同荷载作用下的总车辙量基本相同,同时表面层的厚度变化也较小,说明沥青路面的车辙主要发生在中面层。室内试验表明,沥青路面的车辙与环境温度关系极大,尤其是在沥青的软化点附近,动稳定度和总变形量有明显的拐点。因此,在高温季节通过控制一定时间区段重车的通行是减少车辙的主要手段之一。

Rutting is one of the distresses for expressway asphalt pavement. The rutting characteristics and occurring time are analyzed through investigation and test, such as rutting depth, asphlat content of the cross section, aggregate grading and so on. For the same intermediate layer, base layer and the same tragic loading, the rutting depth are almost kept constant for different surface aggragate grading （such as AK-13 and SMA-13） .The significant contribution layer for rutting depth is intermediate layer.The tests are also shown that the dynamic stability and deformation depend on the test temperature, especially when the test temperature is close to bitumen soften point, the dynamic stability and deformation will increase rapidly. It is proposed that that heavy truck tragic should be restricted during the season when environmental temperature close to soften point.