粗集料表面纹理粗糙度的分形测量和描述

Fractal measurement and characterization on roughness of coarse aggregate surface texture

为了分析粗集料表面纹理状况对沥青混合料性能的影响,采用激光轮廓仪对8种不同粗集料表面纹理曲线进行直接测量.运用分形理论中对随机过程的结构函数方法,分析了表面纹理曲线的分形特征.采用定量评定方法,以分形维数D和截距K为评价指标,对粗集料表面纹理粗糙度进行了研究.结果表明,粗集料表面纹理曲线均在一定范围内具有分形特性,粗集料表面纹理的粗糙程度不受粒径大小影响.

In order to analyse the influence of coarse aggregate surface texture on performance of asphalt mixtures, surface textures of eight different coarse aggregates were measured directly adopting laser profilometer. On the basis of fractal geometry, structure function method for random process analysis was used to character- ize the roughness of coarse aggregate surface texture. Adopting the quantitative evaluation method, taking the fractal dimension D and the intercept K as evaluating indices, the roughness of coarse aggregates was analyzed. Results show that fractal trait exists in the limited distance of coarse aggregate surface texture curve and the roughness of coarse aggregates nearly has nothing to do with the coarse aggregate size.