基于MLS66加速加载试验的沥青路面车辙变形分析

发布时间：2018-02-03 15:37

本文关键词： 沥青路面加速加载试验车辙变形高温常温　出处：《建筑材料学报》2014年03期 　论文类型：期刊论文

【摘要】：通过MLS66(mobile load simulator 66)加速加载试验,定性、定量探讨了重载交通下高温及常温时沥青路面车辙变形的发生及发展规律.结果表明:在轮载初期的二次压实下路面产生的压密性车辙约占总车辙深度的1/3~1/2;高温下压密变形速率比常温下高1个数量级左右,且平均车辙深度增加速率、平均稳定凹陷变形速率分别约为后者的2倍及5倍;在稳定加载期内,高温下路面隆起面积占总车辙面积比例的平均值约为0.40,常温下约为0.45.建议:应根据平均车辙深度增加速率估算车辙变形的发展情况,制定相应的沥青路面养护管理计划;对于改性类沥青混合料需进行极端高温的抗形变能力试验;应以车辙面积和空隙率的变化来评判车辙变形的发生及类型;应改进中面层材料的组成设计,采用模量较高的沥青混合料.
[Abstract]:The loading test was accelerated by MLS66(mobile load simulator 66. The occurrence and development of rutting deformation of asphalt pavement at high temperature and normal temperature under heavy load traffic are discussed quantitatively. The results show that:. Under the secondary compaction at the initial stage of the wheel loading, the compaction ruts of the pavement account for about 1 / 3 / 1 / 2 of the total rutting depth; The compaction deformation rate at high temperature is about 1 order of magnitude higher than that at normal temperature, and the average rutting depth increases, and the average deformation rate of stable depression is about 2 times and 5 times of that of the latter, respectively. During the stable loading period, the average value of road uplift area to total rut area under high temperature is about 0.40. It is suggested that the development of rut deformation should be estimated according to the increasing rate of average rutting depth, and the corresponding maintenance and management plan of asphalt pavement should be formulated. For the modified asphalt mixture, it is necessary to test the deformation resistance of the modified asphalt mixture at extremely high temperature. The occurrence and type of rut deformation should be judged by the change of rutting area and void ratio. It is necessary to improve the composition design of medium-surface material and adopt asphalt mixture with high modulus.
【作者单位】：同济大学道路与交通工程教育部重点实验室;新疆大学建筑工程学院;
【基金】：国家自然科学基金资助项目(51168044) 上海市科学技术委员会重点科技项目(08201202400)
【分类号】：U414;U416.217
【正文快照】： 以半刚性材料为基层的高等级道路沥青路面,沥青面层产生的永久变形占沥青路面车辙总量的90%以上.沥青混合料车辙性能试验通常包括传统室内试验、加速加载试验(APT)、道路现场观测等.由于APT不但能较好地模拟车辆荷载作用,而且能在短期内得到实际路面在长期行车荷载作用下的使

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