细观尺度域承担着细微观交互与宏细观传递的跨尺寸桥渡作用，现有研究多集中于单一尺寸而忽视了沥青混合料细观尺度域的过渡特性，本项目借助复合材料等效夹杂理论及计算机辅助技术，开展沥青混合料细观尺度域的跨尺寸桥渡机制研究。首先，基于沥青材料动态性能测试方法，研究集料-沥青界面过渡区及沥青砂浆的流变特性，提出界面过渡区临界厚度及缺陷空隙临界尺寸。其次，运用工业CT断层扫描及数字图像处理技术，重建沥青混合料细观结构三维点云模型，基于局部特征信息提取分析粗集料及缺陷空隙的三维轮廓与空间分布特性。最后，基于等效夹杂原理及有限元分析方法，建立沥青混合料细观尺度域局部均匀化模型，分析局部均匀化模型力学响应的分布规律。基于上述研究内容，通过引入界面过渡区粘弹性参数的局部均匀化模型解释细微观交互作用，基于局部均匀化模型的全局等效参数探究宏细观传递作用，最终揭示沥青混合料细观尺度域跨尺寸桥渡机制。

Meso-scale plays a bridged role to connect meso-micro scale for interaction and macro-meso scale for transition. Current studies mainly focus on a unique scale and ignore the intermedium function of meso-scale for asphalt mixture, this study employs the equivalent inclusion theory of composite materials and the computer-aided technology to investigate the meso-scale bridged mechanism under trans-scale for asphalt mixture. First, based on the dynamic testing methods of asphalt materials, study on the rheological feature of aggregate-asphalt interface transit zone (ITZ) and asphalt fine aggregate matrix (FAM), determine the critical thickness of ITZ and the critical size of defect air voids. Second, apply the industrial computed tomography (CT) and digital image process (DIP) to reconstruct the three-dimensional (3D) point-cloud model of asphalt mixture at meso-scale, analyze the 3D outline and distribution feature of coarse aggregates and defect air voids based on the local information extraction. Finally, based on the equivalent inclusion theory and finite element method (FEM), build locally equivalent models of asphalt mixture at meso-scale, analyze the mesoscopic distribution of mechanical responses for locally equivalent models. Based on the research contents, this study will interpret the interactive function of micro-meso scale according to locally equivalent models by including the visco-elastic parameters of ITZ, and explore the transit function of meso-macro scale via wholly equivalent parameters based on locally equivalent models. Thus, this project will build the meso-scale bridged mechanism under trans-scale for asphalt mixture.