基于细观结构特性的超薄沥青混凝土性能评价研究  

Research on performance evaluation of ultra-thin asphalt concrete based on meso-structural characteristics

作　　者：李智[1] 姚泽瑞 LI Zhi;YAO Zerui(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,Guangdong,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510641

出　　处：《河南理工大学学报（自然科学版）》2023年第3期165-172,共8页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(51378223);广东省交通运输厅科技项目(2014-02-003,2016-02-003)。

摘　　要：为满足薄层加铺结构工程需要,以超薄沥青混凝土(ultra-thin asphalt concrete,UTAC)为例,基于材料的细观结构特性,采用数字图像分析和数值仿真方法,对加铺材料的体积特性和虚拟力学性能进行评价。马歇尔试验结果表明,采用CAVF法进行级配优化,可以提高材料的骨架密实度,沥青混合料的高温和抗滑性能得到改善。使用CT扫描和数字图像处理技术可获取混合料试件内部各组分空间分布信息,提出相应均匀性评价指标,并通过对比试验发现UTAC均匀性较好。力学性能方面,设计正交试验方案,通过离散元软件PFC3D进行虚拟三轴剪切试验,分析了集料级配、棱角性、针片状含量对沥青混合料抗剪性能的影响程度。For the sake of fullfilling the engineering requirements of thin layer overlay constructions,based on ultra-thin asphalt concrete(UTAC)overlay structure,taking the meso-structure of materials into consider-ation,the digital image processing and numerical simulation were employed in this study to conduct a com-prehensive investigation on the volumetric characteristics and mechanical properties of the overlay materi-als.Enhanced high temperature and anti-skid performance were recognized through the results of Marshall test,which verified that the density of material aggregate structure could be improved employing the CAVF method during gradation design.Besides,CT scanning and digital image processing were applied to extract the spatial distribution of respective phases within asphalt mixtures,while corresponding parameter depict-ing its homogeneousness was put forward,then comparison confirmed the fairly homogeneousness of UTAC.Additionally,in order to analyze the impact of different factors on the shear strength of material,virtual three-axis shear test was conducted based on discrete element method software,namely PFC,using orthogo-nal experimental design.

关 键 词：超薄沥青混凝土 CT扫描 离散元法 体积特性 抗剪性能 

分 类 号：U414[交通运输工程—道路与铁道工程]