再生沥青混合料拌和均匀性识别与机理分析  

Identification and analysis of mixing-induced homogeneity in reclaimed asphalt pavement materials

作　　者：吴建涛[1] 邱磊 焦岩 刘泉[1] 敬超[3] 朱金龙 Wu Jiantao;Qiu Lei;Jiao Yan;Liu Quan;Jing Chao;Zhu Jinlong(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Hebei Transportation Planning and Design Research Institute Co.,Shijiazhuang 050000,China;Hebei Province Engineering Research Center for Harmless Synergistic Treatment and Recycling of Municipal Solid Waste,Yanshan University,Qinhuangdao 066000,China;Shanghai City Construction Municipal(Engineering)Group Co.,Shanghai 200131,China)

机构地区：[1]河海大学土木与交通学院,南京210098 [2]河北省交通规划设计研究院有限公司,石家庄050000 [3]燕山大学河北省城市固体废物无害化协同处理与循环利用工程技术研究中心,秦皇岛066000 [4]上海城建市政工程(集团)有限公司,上海200131

出　　处：《Journal of Southeast University(English Edition)》2024年第2期193-202,共10页东南大学学报（英文版）

基　　金：The National Science Foundation of China (No.52078190);the Natural Science Foundation of Jiangsu Province (No.BK20221501);the Natural Science Youth Fund of Jiangsu Province(No.BK20220983);the Natural Science Foundation of Hebei Province(No.E2019203559)。

摘　　要：为探究再生沥青混合料(RAP)拌和过程中的均匀性特征变化规律,考虑拌和时间和RAP料老化程度因素,选择二氧化钛粉末作为RAP料示踪剂,在实验室内制备掺有质量分数40%RAP料的再生沥青混合料,并建立均匀性指标评价再生沥青混合料均匀性特征.通过计算机断层扫描技术(CT)获取沥青混合料数字图像,并对图像进行基于Mimics软件的组分识别,最终建立关于组分和结团的均匀性评价体系.结果表明:粗集料分布情况对混合料拌和均匀性的影响最大,其次是沥青和孔隙分布情况;延长搅拌时间有利于提高再生沥青混合料的拌和均匀性,然而拌和过程中形成的新结团又会阻碍拌和均匀性的改善.考虑组分和结团的均匀性评价体系可以有效揭示再生沥青混合料拌和均匀性特征变化规律,为建设高质量再生沥青路面提供参考.Asphalt mixtures were prepared in the laboratory using reclaimed asphalt pavement(RAP)at a 40%mass concentration to investigate the homogeneity characteristics of RAP during the mixing process,taking into account the mixing duration and aging rate.Specifically,titanium dioxide powder was incorporated into RAP binders as an identification tracer.Homogeneity indices were subsequently established to evaluate the homogeneity characteristics of asphalt mixtures.Computed tomography(CT)was used to create digital images of asphalt mixtures,and Mimics software was used to identify the components.Finally,a homogeneity evaluation system was established to assess the uniformity of both the components and RAP agglomerates.The results indicate that homogeneity is mostly influenced by the distribution of coarse aggregates,followed by asphalt binders and air voids.Homogeneity improvement is hindered by the formation of new agglomerates during the mixing process,whereas it is increased by prolonging the mixing time.A homogeneity evaluation system based on components and agglomerates can effectively reveal the principles governing homogeneity characteristics and provide a reference for the construction of high-quality recycled asphalt pavement.

关 键 词：再生沥青混合料 拌和均匀性 图像分割 均匀性指标 

分 类 号：U416.26[交通运输工程—道路与铁道工程]