基于图像技术的沥青混合料细观结构研究进展

摘要

设计沥青混合料多依据沥青混合料的宏观品质，而沥青混合料的细观结构对宏观性能有着重要影响，基于图像技术的细观研究可深入地解释沥青混合料的路用表现。介绍了数字图像处理技术的定义及利用 X-ray CT 无损技术获取沥青混合料内部结构的方法，并综述了利用数字图像技术分析沥青混合料内部结构特性，包括集料形状、分布、接触性能及空隙等方面的研究，表明了图像技术研究沥青混合料的可行性。同时，还简要介绍了基于图像处理的沥青混合料细观结构的数值模拟方法，主要讨论了离散元方法和有限元方法的特点。最后提出了目前研究中的几点不足，并展望了沥青混合料细观结构未来的研究方向，为今后沥青混合料的研究提供参考。%The current design of asphalt mixture is mostly based on macro properties,while microstructure has great influence on the performance of asphalt mixture.Study on internal structure can describe and predict the characteristics of asphalt mixture in depth with the help of digital image technology.The definition of digital image processing and X-ray CT which can obtain internal structure image of asphalt mixture are introduced.The review of research on internal structure characteristics such as aggregate distribution,contacts and air void is presented,which demonstrates the effectiveness of image processing technology.Numerical simulation on microstructure of asphalt mixture is also discussed,including DEM and FEM.Finally,some problems and the trends of development in microstructure study on asphalt mixture are proposed,which will provide a reference for future research development of asphalt mixtures.