Study of micro-structure of asphalt mixture based on fractal theory

Abstract

In order to study distribution regularity of heterogeneity of micro-structure of asphalt mixture, this paper which is based on fractal theory starts with aggregate distribution of asphalt mixture, and calculates fractal dimension of aggregate of ten groups of asphalt mixture in AC-16C type by using double log coordinates. It will evaluate indirectly heterogeneity of asphalt mixture through the analysis of correlation between fractal dimension of aggregate and aggregate distribution. The study results indicate that with the enlargement of fractal dimension of aggregate, the ability of space stuffing will strengthen, the closely knit degree of aggregate strength; as the decrease of flat and elongated particle in coarse aggregate, the possibility of aggregate being crushed will drop, which will improve the homogeneity of asphalt mixture and decrease the possibility of early damage of asphalt mixture.