A Grading Design Method of Mineral Aggregate to Improve the Mechanical Properties of Asphalt Mixture

Abstract

The invention relates to a mineral aggregate gradation design method for improving mechanical performance of an asphalt mixture. According to the method, multiple key sieves are set; optimum mixing proportions are solved through calculation by employing compaction voidages of coarse and fine aggregate under different mixing proportions; the mixing aggregate mixed according to the optimum mixing proportions is taken as the coarse aggregate and finer aggregate for above calculation, the process is repeated until the mixing proportions of all aggregate are solved, correction is carried out according to mineral aggregate, and final mineral aggregate gradation is obtained. According to the method, the mineral aggregate gradation is determined by employing a scientific method, the influences of factors such as experience are avoided, the method is more accurate, the performance of the mixture test piece prepared by the method is greatly improved, the dosage of asphalt is reduced, and the construction cost of an asphalt pavement can be saved.

Description

technical field [0001] The invention relates to the technical field of mineral material gradation design methods, in particular to a mineral material gradation design method for improving the mechanical properties of asphalt mixtures. Background technique [0002] Asphalt mixture is a general term for mixtures made by mixing mineral aggregates and asphalt binders. The mineral aggregates are composed of stones of different specifications (particle sizes) in a certain proportion, and the determined proportion corresponds to the only mineral aggregate grade. It has a significant impact on the road performance and mechanical properties of asphalt mixture. In engineering, the blending ratio of stones with different specifications is generally determined according to the following procedures. First, according to actual needs, determine the type of gradation to be used and the corresponding range of mineral material gradation; Grading composition; finally, combined with experience...

AI Technical Summary

Problems solved by technology

[0009] In view of the above-mentioned analysis, the present invention aims to provide a method for designing mineral aggregate gradation to improve the mechanical properties of asphalt mixture, to solve the problem that the existing asphalt mixture mineral aggregate gradation determination method adopts an empirical method and lacks scientific support, and it is impossible to determine the optimal gradation composition of aggregates produced by different materials or different processing techniques, etc.

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