谈如何提高城市沥青路面的动稳定度
2018-11-19曹耀兮
曹耀兮
【摘 要】 文章主要从沥青的原材料选择、合成级的配置范围,集料的原材料选择以及混合配置材料的耐高温性能等几个方面来谈论如何提高城市沥青路面的动稳定度,文章通过一系列的试验数据的收集和分析,最终可以提议找到一个可以提高沥青路面的动稳定度和耐高温性能的最佳沥青材料混合的方案,从而可以满足城市多样化路面的要求。
【关键词】 合成级配;拌和温度;马歇尔稳定度;高温性能;动稳定度
[Abstract] With the rapid development of cities in our country in recent years, the traffic network of cities has been built up slowly, and many kinds of road surfaces have appeared.In order to meet the needs of urban road development, the selection of asphalt raw material, aggregate raw material and synthetic gradation range of asphalt raw material, aggregate raw material and synthetic gradation range are analyzed from the test of actual mix proportion of asphalt mixture. A series of requirements of aggregate heating temperature, asphalt heating temperature, mixing temperature and mixing time, and final discharge temperature of asphalt mixture are put forward. Finally, based on the actual dynamic stability test results of asphalt mixture, the matching scheme is put forward to meet the requirements of the final asphalt pavement performance at high temperature. This paper focuses on the selection of asphalt raw materials, the selection of aggregates, the selection of synthetic gradation range, and the selection of density. The best scheme to improve the high temperature index such as Markov stability and dynamic stability at 60 ℃ of dense asphalt mixture is found to meet the pavement requirements of high grade and heavy load traffic such as Taiyuan Expressway, Loop Road and so on.
[Keywords] synthetic gradation, mixing temperature, Marshall stability, high temperature performance, dynamic stability
比如說高速公路或者环形公路,在高速公路或者是一些快速路上,车流量很大,行车速度也非常的快,时间一般也很集中,因此很容易导致路面上车撤的现象,人们的行车路线一般都具有一致性,再加上在快速路的两旁,缺乏绿色植物的保护,夏季的时候路面的温度有时候会高达35℃-40℃,路面的温度是非常高的,而这些因素都可能会造成车撤现象的发生。
1 路面平整度的影响因素
1.1 路基不均匀沉降
路基产生不均匀沉降有两个原因,路基的压缩沉降和地面的承载能力不够,不均匀沉降就是路基从表面上看有着不同程度的沉落,或是路基自己太重沉落,或是向两侧施力挤出平面。这种现象的产生的原因一般是施工时材料选取不恰当,建造时路基的构造不符合标准,也有可能是建造完成后施力不足,等到真正使用时,不能承载太多车辆而致使路基沉降。
1.2 基层不平整
路基的平整度会严重影响路面的平整度,因为后续工程中的基面铺平都是一样的程序,基层不平会使面层摊铺产生虚铺的后果,在经过压实的过程后,导致路面最终不平整。……
