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Fractal Theory on Graded Evaluation of Asphalt Mixture and Research of Road Performance

Author: ZengGuanBo
Tutor: HeZhaoYi
School: Chongqing Jiaotong University
Course: Road and Railway Engineering
Keywords: Asphalt mixture Fractal Theory Grading Rutting Water stability Dimension range
CLC: U414
Type: Master's thesis
Year: 2011
Downloads: 57
Quote: 0
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Abstract


Since the 1990s, China's highway construction has developed rapidly, in large-scale construction of the process, the more serious the early destruction of the asphalt pavement, prominent high temperature Rut. Chongqing region the highest summer temperatures often above 38 ℃, and the long duration of the hot weather, more rain, more demanding requirements plus overloaded and channel traffic, the asphalt mixture road performance. Looking to mix adapted to the the Chongqing regional climate characteristics engineering design gradation range road works solved the problem. This article relying on the Chongqing Municipal Committee of science and technology projects: to improve the Chongqing region asphalt mixture dynamic stability studies similar to the climate regions asphalt pavement condition and research through access to domestic and international, combined with the actual situation of the Chongqing region, select the Chongqing area commonly used raw materials AC-20, AC-16, AC-13, SMA-13 ??four kinds of commonly used asphalt mixture indoor mix stage with optimization of design and composition of asphalt mixture based on fractal theory class with the theoretical analysis. Gap smaller coarse aggregate level by different proportions of rough set material bulk density test with composition; select five different N values ??calculated shapes of fine aggregate gradation, determined 5-6 key through the sieve the rate of 5 to 6 different thickness ratio of composition the mixture gradation indoor rut test and freeze-thaw splitting test, to find the optimal thickness ratio. Using fractal theory study asphalt mixing material ore feed grade with the fractal characteristics, identify fractal dimension and set of material volume parameters, quality parameters, grade distribution curve toward Marshall test parameters such as the changes in the law, to determine the fractal dimension of quantitative evaluation of ore material graded. On the basis of the best aggregate ratio of AC-13, AC-16, AC-20, SMA-13 ??four types of asphalt mixture road performance, rutting test, freeze-thaw splitting test mix high temperature stability and water stability. And the establishment of the fractal dimension of the correlation between the performance road use with high temperature stability of asphalt mixture water stability. Considering the test results, preferably dispatched a high stability, water stability in line with national norms aggregate gradation, recommended adapted to the rational engineering of high temperature and rainfall areas in Chongqing the design gradation range and gradation range fractal dimension preliminary establish the relationship between the road surface microstructure and macroscopic road performance.

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CLC: > Transportation > Road transport > Road works > Road construction materials
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