Distribution Properties of Internal Air Voids in Ultrathin Asphalt Friction Course  

作　　者：林宏伟 杜晓博 ZHONG Changyu WU Ping LIU Wenchang SUN Mutian ZHANG Hongchao LIN Hongwei;DU Xiaobo;ZHONG Changyu;WU Ping;LIU Wenchang;SUN Mutian;ZHANG Hongchao(Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 201804,China;Postdoctoral Station of Mechanical Engineering,Tongji University,Shanghai 201804,China;Guangzhou Highway Engineering Group Co.,Ltd,Guangzhou 510075,China;Inner Mongolia Road and Bridge Group Co.,Ltd,Hohhot 010051,China)

机构地区：[1]Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 201804,China [2]Postdoctoral Station of Mechanical Engineering,Tongji University,Shanghai 201804,China [3]Guangzhou Highway Engineering Group Co.,Ltd,Guangzhou 510075,China [4]Inner Mongolia Road and Bridge Group Co.,Ltd,Hohhot 010051,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2023年第3期538-546,共9页武汉理工大学学报（材料科学英文版）

基　　金：Funded by Technology Innovation Demonstration Project of the Transportation Department of Yunnan Province (Science and Technology Education Section of Transport Department of Yunnan Province [2019](No.14)。

摘　　要：The distribution characteristics of air voids in ultrathin asphalt friction course(UAFC) samples with different gradations and compaction methods were statistically analyzed using X-ray computed tomography(CT) and image analysis techniques. Based on the results, compared with the AC-5 sample, the OGFC-5mixture has a higher air void ratio, a larger air void size and a greater number of air voids, with the distribution of internal air voids being more uniform and their shapes being more rounded. The two-parameter Weibull function was applied to fit the gradation of air voids. The fitting results is good, and the function parameters are sensitive to changes in both mineral gradation and compaction method. Moreover, two homogeneity indices were proposed to evaluate the compaction uniformity of UAFC samples. Compared with the Marshall method,the SGC method is more conducive to improve the compaction uniformity of UAFC samples. The compaction method significantly influences the air void distribution characteristics and compaction uniformity of AC-5sample, but has a less significant impact on OGFC-5 sample. The experimental results in the study provides a solid foundation for further explorations on the internal structure and mixture design of UAFC.

关 键 词：ultrathin asphalt friction course air void characterization air void gradation homogeneity evaluation X-ray CT 

分 类 号：U414[交通运输工程—道路与铁道工程]