基于细观结构的沥青混合料三维重构研究

Research on Three Dimensional Reconstruction of Asphalt Mixture based on Microstructure

为了对AC-10沥青混合料试件的空隙率进行研究,在实验室采用SYM-457马歇尔击实仪制作AC-10标准马歇尔试件,并将上述试件按3mm间隔进行CT扫描,应用Matlab对所得扫描图像进行处理。结合统计学方法计算其空隙率,同时将所得到的dcm格式的CT扫描图像导入Mimics软件中进行三维重构,通过对阈值的反复调节,实现对沥青混合料中粗集料、沥青砂浆及空隙的识别与分离,进而得到沥青混合料的空隙率。结果表明:相对于应用统计学方法计算得到的空隙率,用Mimics软件进行三维重构后得到的空隙率与实际空隙率值更为接近,能够更加准确地得到沥青混合料内部细观结构特征,对沥青混合料三维重构方面的研究提供了新思路,并起到一定的推动作用。

In order to research the air void ratio of AC-10 asphalt mixture specimens, SYM-457 automatic Marshall compaction instrument is used to make AC-10 standard Marshall compaction molding, CT technology is applied to scan at interval of 3millimeters, then Matlab is used for image processing, and combined with statistical methods to calculate air void percentages. In the meantime importing the scanned images of dcm format to Mimics for 3D reconstruction, through adjustment of the threshold to identify and separate the coarse aggregate, asphalt mortar and air voids, and furthermore to obtain the air void percentages of AC-10 asphalt mixture. The result shows that compared with the statistical method, the Mimics software can obtain the void ratio more dose to the actual value and more accurately ascertain the inside microstructure characteristics of the asphalt mixture, which will provide a new idea for three dimensional numerical simulation.