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

A technology of asphalt mixture and design method, applied in the direction of design optimization/simulation, calculation, instrument, etc., can solve problems such as inability to determine the optimal grading composition of aggregates, lack of scientific support, etc., to improve road performance and mechanical properties , the design process is intuitive, and the effect of fatigue life improvement

Active Publication Date: 2019-03-05
HEBEI PROVINCIAL COMM PLANNING & DESIGN INST +1
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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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  • A Grading Design Method of Mineral Aggregate to Improve the Mechanical Properties of Asphalt Mixture
  • A Grading Design Method of Mineral Aggregate to Improve the Mechanical Properties of Asphalt Mixture
  • A Grading Design Method of Mineral Aggregate to Improve the Mechanical Properties of Asphalt Mixture

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[0047] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principles of the present invention.

[0048] A mineral aggregate gradation design method to improve the mechanical properties of asphalt mixture, using this method to design aggregate mineral aggregate gradation with a maximum nominal particle size of 20mm, and comparing the performance of the aggregate before and after gradation optimization.

[0049] S1. According to the maximum nominal particle size of the aggregate of the mixture is 20mm, the aperture of the selected sieve is: 19.0mm, 16.0mm, 13.2mm, 9.5mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm, 0.075mm; 19.0mm, 13.2mm, 9.5mm, 4.75mm and 2.36mm sieve holes are regarded as key sieve holes, and aggregates are divided into 13.2mm-19...

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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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 王国清张忠民孟会林闫涛秦禄生王联芳王庆凯高占华李浩天焦彦利严华张鹏刘喜平郭建新王喜刚
Owner HEBEI PROVINCIAL COMM PLANNING & DESIGN INST
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