基于CT图像的沥青混合料分形特征的研究

采用分形理论对沥青混合料内部结构的复杂程度进行了量化研究.对沥青混合料内部断面的CT图像,用差分盒维数法得到其断面形貌的分形维数,再通过分形维数的大小描述沥青混合料内部结构的复杂程度.对沥青混合料试件和沥青路面芯样分形维数的比较表明,混合料试件内部结构复杂程度更高;采用相同的试件加工方法在试验室获得三种不同类型的沥青混合料(SM A,AC-20G,AC-25G),得到的分形维数相差不大,但该分形维数与路面芯样相比却有较大差异,说明试件加工方法对沥青混合料内部结构形貌特征有较大影响.分形理论结合CT图像对研究定量描述沥青混合料内部结构特征是一种十分有效的方法.

Study on Fractal Characteristics of Asphalt Mixture Based on CT Image

The asphalt mixture internal structure was quantitatively studied by fractal theory.The fractal dimensions of the cross section of asphalt mixture were obtained by DBC method,then the complication degree of asphalt mixture internal structure was reflected by the fractal dimensions.The complication degree of internal structure of asphalt mixture was higher than core sample of asphalt pavement by comparing the fractal dimensions.Three different asphalt mixtures(SMA,AC-20G,AC-25G) were created for the same processing methods in laboratory,and their fractal dimensions have little differences,but comparing with fractal dimensions of core sample of asphalt pavement have more differences,the results indicate that the processing methods of samples have effect on characteristics of internal structure of asphalt mixture.The fractal method is very useful to describe characteristics of internal structure of the asphalt mixture based on the CT pictures.