李智, 姚泽瑞.基于细观结构特性的超薄沥青混凝土性能评价研究[J].河南理工大学学报（自然科学版）,2023,42(3):165-172.

LI Z, YAO Z R.Research on performance evaluation of ultra-thin asphalt concrete based on meso-structural characteristics[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(3):165-172.

基于细观结构特性的超薄沥青混凝土性能评价研究

李智, 姚泽瑞

华南理工大学 土木与交通学院，广东 广州 510641

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。

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

doi:10.16186/j.cnki.1673-9787.2021030051

基金项目: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）

收稿日期:2021/03/15

修回日期:2021/05/24

出版日期:2023/05/25

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

LI Zhi, YAO Zerui

School of Civil Engineering and Transportation，South China University of Technology，Guangzhou 510641，Guangdong，China

Abstract: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 consideration，the digital image processing and numerical simulation were employed in this study to conduct a comprehensive investigation on the volumetric characteristics and mechanical properties of the overlay materials.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 depicting 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 orthogonal experimental design.

Key words:ultra-thin asphalt concrete;CT scan;discrete element method;volume characteristic;mechanical property

基于细观结构特性的超薄沥青混凝土性能评价研究_李智.pdf