论文部分内容阅读
沥青混合料的不均匀性主要表现在沥青混合料中孔隙和集料分布的不均匀性,孔隙分布是否均匀直接关系到沥青路面的力学性能和使用寿命。为了评价沥青混合料动态压实过程中的压实均匀性,引入X-ray计算机断层扫描技术,对各种旋转压实次数下的试件进行扫描,再将试件图片按不同半径虚拟截成不同尺寸的试件,分别计算和比较它们的纵向孔隙结构分布。研究结果表明:对于沥青混合料试件的纵向孔隙率分布,试件两端的孔隙率明显要高,而试件中间部位的孔隙率相对较低;随着旋转压实次数的增加,沥青混合料的压实均匀性越来越好,当旋转压实次数增大到55次时,虚拟截成的不同半径的试件内部孔隙分布高度重合,表明试件的压实均匀性非常好。
The inhomogeneity of asphalt mixture is mainly manifested in the heterogeneity of pore and aggregate distribution in asphalt mixture. Whether the pore distribution is uniform or not is directly related to the mechanical properties and service life of asphalt pavement. In order to evaluate the compaction uniformity during the dynamic compaction process of asphalt mixture, X-ray computed tomography was introduced to scan the specimens under various rotary compaction times. Then, the specimen images were virtually cut into different radii Different size specimens were calculated and compared with their longitudinal pore structure distribution. The results show that for the longitudinal porosity distribution of asphalt mixture samples, the porosity of both ends of the specimen is obviously higher while the porosity of the middle part of the specimen is relatively lower. With the increase of rotary compaction times, the asphalt mixture The compaction uniformity is getting better and better. When the number of rotary compaction is increased to 55 times, the distribution of the internal porosity of the specimens with different radii is highly coincident, indicating that the compaction uniformity of the specimens is very good.