【摘要】 采用X-CT技术、数字图像处理技术与分形理论相结合对多孔沥青混合料的空隙竖向分布特性进行了研究,结果表明:空隙特征图像可以定性描述多孔沥青混合料的连通情况和分布特性,多孔沥青混合料中没有面内连通情况;所研究的6个截面空隙率分布范围为17.7%~22.2%;不同截面的空隙数量最大相差16个,约占空隙总量的四分之一;空隙轮廓分维数均大于其相应的空隙面积分维数,且与空隙数量和空隙率无关。空隙级配图显示,同一试件内两个正交截面空隙的级配大多分布在4~8 mm内,但分布形态各异。经对比分析发现,横向空隙与竖向空隙除最大直径相差2 mm外,等效直径分布较为接近。更多还原

【Abstract】 The research on the vertical distribution of air voids of porous asphalt mixture was carried out using X-CT technique,digital graphic processing technique and the fractal theory.The results show that the void features images are able to describe the connectivity and distribution characterization of porous asphalt mixture and there is no in-plane connectivity in it;the air voids of the six sections studied ranges from 17.7% to 22.2%;the greatest discrepancy of air void quantity among different sections is 16,accounting for about one-quarter of the total quantity;all the air void profile fractal dimension are larger than the corresponding air void area fractal dimension,and it has nothing to do with air void quantity.The air void gradation figure shows that the gradations in two orthogonal cross-section mostly distribute within 4~8 mm in the same sample,but with different distributional pattern.The contrastive analysis find that the discrepancy of maximum diameter between transverse air void and vertical air void is 2 mm with relatively close equivalent diameter.更多还原