Bituminous Mixture Properties And The Aggregate Gradation Fractal Dimension Of Correlation

Asphalt mixture asphalt material, combination is the aggregate, space composed of three phase three-phase body, asphalt mixture in the use of performance, the differences of liquor that is the essence of asphalt mixture in the differences between the distribution of three phase. So of asphalt mixture, and the research on the mesoscopic is particularly important.This article is from asphalt mixture aggregate gradation, based on the basic theory of fractal geometry, with mathematical theory describes the aggregate size distributions of the fractal characteristics, this paper introduces the aggregate gradation fractal dimension calculation method. Through the continuous gradation and discontinuous distribution in the fractal characteristics for analysis, that level is a continuous with heavy fractal, pulsation gradation has double the fractal characteristics. Put forward by use of coarse aggregate gradation fractal dimension Dca and fine aggregate gradation fractal dimension Dfa as description asphalt mixture aggregate gradation fractal characteristics of the index. The fractal theory spread to the calculation of the gradation, and derived the aggregate gradation fractal dimension, and the formula of the calculation formula not only can be used for calculating the gradation, also can be calculated with continuous level.To distribution in the fractal theory as a foundation, puts forward the AC gradation, SMA gradation gradation of upper Dca, Dfa value, using fractal grading theory calculation formula may be calculated to meet the requirements of the Chinese code gradation.This paper respectively on nominal size16mm maximum for dense gradation asphalt mixture type and discontinuous gradation AC SMA type of asphalt mixture, analysis aggregate gradation fractal dimension and way-use performance relationship. The grey relational analysis method, this paper analyzes the Dfa, Dca to dense gradation asphalt mixture AC, SMA type of asphalt mixture with the way the influence degree of the performance, respectively, to determine the mixture with road performance index of the main factors influence. Through the Dca, Dfa and performance test results of regression analysis between, respectively, satisfied nominal size16mm maximum for the dense gradation asphalt mixture AC, SMA type of asphalt mixture with properties of each Dca, Dfa Suggestions range.