再生粗集料棱角性对混合料高温性能评价  

Evaluation of High-temperature Performance of Asphalt Mixture based on Angularity of Recycled Coarse Aggregate

作　　者：郭鹏[1] 韦万峰 唐伯明[1] 杨帆[1] 

机构地区：[1]重庆交通大学交通土建工程材料国家地方联合工程实验室,重庆市400074

出　　处：《公路》2017年第9期220-225,共6页Highway

基　　金：交通土建工程材料国家地方联合工程实验室开放基金项目;项目编号LHSYS-2014-09;重庆教育委员会科技项目;项目编号KJ1500524;重庆交通大学研究生科研创新(创新基金)项目;项目编号20160124;重庆交通大学研究生教育创新基金项目;项目编号20140117

摘　　要：为分析再生粗集料棱角性对混合料高温性能的影响,采用动态颗粒图像分析仪测试了石灰岩、花岗岩、旧集料(花岗岩)3种集料不同粒径颗粒的形态结构,以球形度、凸形度、粗糙度3个指标定量评价集料颗粒的棱角性,分析集料棱角性的变化特征及不同掺配比例再生粗集料的棱角性与再生沥青混合料高温稳定性的相关性。结果表明:集料颗粒棱角性与其粒径大小呈线性相关,随着集料颗粒粒径的增大,其棱角性降低;旧集料与所选新集料相比,其棱角性会有一定程度降低;再生粗集料的棱角性随着旧集料掺配比例增大而减小,再生粗集料的棱角性与再生沥青混合料高温性能呈高度线性相关。In order to analyze the angularity of recycled coarse aggregate impact on the high- temperature performance of the asphalt mixture, the dynamic particle image analyzer is used to test the morphology of three kinds of aggregates with different size, the three kinds of aggregates include limestone, granite, and old aggregates （granite）. The angularity of aggregates are quantitatively evaluated by three indexes, which are spherical degree, convex degree and roughness, analyzing the change characteristics of the angularity of aggregate, and study the relevance between the high-temperature performance of recycled asphalt mixture and the angularity of recycled coarse aggregate with different content of old aggregates. The results show that angularity of aggregate is linearly related to its particle size, the angularity of aggregates decrease with the increase of size of aggregates. Compared with the selected new aggregates, the angularity of old aggregate would reduce to a certain extent. The angularity of recycled coarse aggregate decreases with the increase proportion of the old aggregate, the angularity of the recycled coarse aggregate and the high-temperature performance of recycled asphalt mixture are in highly linear correlation.

关 键 词：沥青混合料 再生 粗集料 棱角性 高温性能 

分 类 号：U414.01[交通运输工程—道路与铁道工程]