Research On Grade-by-Level Filling Hierarchy Analysis Based On Fractal Theory

mixture is mainly composed of mineral aggregate,mineral powder,asphalt and appropriate admixtures.It is a complex multi-phase system,and its microstructure is extremely complex.At present,most of us use macroscopic indicators such as physical properties and mechanical performance to analyze asphalt mixture,which can not accurately and effectively react with asphalt mixture.The microscopic composition of the aggregate.As a new theory,fractal theory opens up a new field for the study of geometry.In recent years,many researchers have focused on introducing fractal theory into the analysis of asphalt mixtures.They believe that although the structure of asphalt mixtures is complex,they have certain self-similarity due to the similar material composition,which meets the basic requirements of fractal theory analysis.On the basis of reading a large number of references and combining with fractal theory and filling theory step by step,this paper carries out the filling test of coarse and fine aggregates.According to the test results of density or bearing ratio,the secondary aggregates are filled into the primary mixture in turn,and the fractal analysis of the particle size passing rate of the mixture after filling test is carried out.The reasonable range of fractal dimension Dc and Df of coarse and fine aggregate is obtained.The coarse and fine aggregates selected after the step-by-step filling test were mixed with 35%and 25%of the 4.75 mm sieve pass rate.The fractal dimension D value of the gradation curve was calculated.The variation law between the fractal dimension and the pavement performance of asphalt mixture was found out by combining with the laboratory related tests,and the fractal theory was verified to analyze the leaching.The feasibility and superiority of green mixture.Finally,combining with the paving of the test section of the solid engineering,the paper verifies the results of the previous research,and provides theoretical support and engineering support for the application of fractal theory and asphalt mixture analysis.