多孔沥青混合料空隙特征与路用性能关系  

Relationship between characteristic of void and road performance of porous asphalt mixture

作　　者：吴浩[1,2] 张久鹏[1] 王秉纲[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]河南省交通运输厅,河南郑州450052

出　　处：《交通运输工程学报》2010年第1期1-5,共5页Journal of Traffic and Transportation Engineering

基　　金：国家自然科学基金项目(50608006);陕西省自然科学基金项目(2007E223);新世纪优秀人才支持计划项目(NCET-07-0120);交通部交通应用基础研究项目(2006319812120)

摘　　要：以3种级配的OGFC-13马歇尔试件作为载体,运用X-CT技术和数字图像处理技术获取了不同类型混合料试件的内部空隙分布图像,采用分形理论研究了多孔沥青混合料的空隙分维特征,分析了空隙分维特征与混合料路用性能的关系。分析结果表明:多孔沥青混合料的劈裂强度随着空隙率的增加而减少,随着空隙轮廓分形维数的增大而增大;多孔沥青混合料的渗透系数随着空隙率的增加而增加,随着空隙轮廓分形维数的增大而减小。采用空隙轮廓分形维数可以很好地解释多孔沥青混合料孔隙率基本一致但路用性能差异较大的原因,可以用于分析多孔排水沥青混合料的空隙分布及其路用性能变化趋势。Three Marshall specimens of OGFC-13 with different gradations were selected, and their internal void distributions were obtained by using X-CT technique and digital graphic processing technique. The fractal characteristics of voids were computed by fractal theory, and the relationship between the void characteristics and the road performances for porous asphalt mixtures were analyzed. It is indicated that the split strength of porous asphalt mixture decreases with the increase of porosity, but increases with the increase of the fractal dimension of void profile. The permeation property increases with the increase of porosity, but decreases with the increase of the fractal dimension of void profile. The fractal dimension can explain the reason of the road performance difference for the mixtures with same porosity, so the fractal dimension may be adopted to analyze the void distribution and the changing law of road performance for porous asphalt mixture. 4 tabs, 6 figs, 18 refs.

关 键 词：路面工程 多孔沥青混合料 分形理论 空隙分布 路用性能 

分 类 号：U414.18[交通运输工程—道路与铁道工程]