Research on meso-fractal characteristics of asphalt mixtures
The aggregate skeleton and void structure of asphalt mixture are highly correlated with pavement performance.However,the complex geometric structure and heterogeneity of asphalt mixture bring great difficulties to the characterization and analysis of its meso-structure.In order to investigate the meso-structure characteristics of asphalt mixtures of different gradation types,Asphalt mixture speci-mens with two compaction methods and three design indexes were selected as the study objects,and the meso-structure of the asphalt mix-tures was obtained by CT scanning and 3D reconstruction techniques.The internal structure of asphalt mixture is described by fractal di-mension D and related parameters of multifractal theory.The analysis shows that the multifractal spectrum parameters can better reflect the meso-structure of asphalt mixture than the fractal dimension D.With the increase of average particle size,the meso-structure character-istics of three kinds of asphalt mixtures tend to be the same,and the compaction degree has little effect on the simple fractal and multifrac-tal characteristics of asphalt mixture.
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