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我国现行规范一般是通过马歇尔设计方法控制矿料级配及沥青用量来设计沥青混合料的,但随着路面施工技术的发展,特别是大吨位、高性能压路机的广泛应用,以及道路重载车辆的增多,采用此传统方法设计的沥青混合料,往往存在密实度偏低、油石比偏大等问题,沥青路面施工中经常会出现压实度超百现象,室内的混合料设计指标无法有效进行施工现场控制。而路面通车后又往往会较快出现车辙、拥包、泛油等病害,这些都表明马歇尔试验方法还存在明显的不足之处。本文借鉴了Superpave思想,通过改变击实功即增加击实次数或减少击实次数对沥青混合料空隙率、矿料间隙率、饱和度等指标影响,进行了试验分析,探索了击实功对沥青混合料体积指标的影响。
The current norms in our country are generally designed asphalt mixture by the Marshall design method to control the gradation and the amount of asphalt, but with the development of pavement construction technology, especially the wide range of applications of large tonnage and high performance road rollers, as well as road heavy-duty vehicles , The asphalt mixture designed by this traditional method often has the problems of low density, large ratio of oil to rock, etc., The compaction degree often appears in the asphalt pavement construction, and the design index of the mixture in the room can not be effectively carried out Construction site control. However, after the road is opened to traffic, rutting, bagging, oil panning and other diseases tend to occur sooner, indicating that there are still obvious deficiencies in the Marshall test method. This paper draws on the idea of Superpave, by changing the compaction, that is, increasing the number of compaction or reducing the number of compaction on the impact of asphalt mixture porosity, mineral aggregate porosity, saturation and other indicators, conducted a test analysis to explore the compaction Influence of asphalt mixture volume index.