中文摘要：

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。

英文摘要：

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.