Grading optimization method for asphalt mixture under virtual state

A technology for asphalt mixture and gradation optimization, which is applied in the direction of testing material strength by applying stable shear force, testing material strength by applying stable tension/pressure, and analyzing materials, which can solve the problem of long cycle time and experimenter dependence High, poor stability of test results, etc.

Active Publication Date: 2017-07-14
ZHEJIANG UNIV
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Problems solved by technology

[0003] The traditional optimization of asphalt mixture gradation is mainly based on continuum mechanics, with the accumulation and analysis of a large amount of data from laboratory tests or test roads as the research method, but there are the following shortcomings: (1) The theory of continuum mechanics is based on uniform, continuous, anisotropic The basic assumptions of homogeneity and small deformation are not suitable for describing asphalt mixture, a material with obvious particle characteristics; (2) the ind

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  • Grading optimization method for asphalt mixture under virtual state
  • Grading optimization method for asphalt mixture under virtual state
  • Grading optimization method for asphalt mixture under virtual state

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Embodiment Construction

[0063] The present invention will be further described in detail through specific implementation examples below.

[0064] Implementation example:

[0065] The present invention provides a method for simulating the asphalt mixture gradation optimization method in a virtual state based on particle flow discrete element software PFC3D. In combination with the accompanying drawings, the specific implementation steps are as follows:

[0066] (1) Randomly generate a 3D discrete element model for mechanical tests of asphalt mixtures that meets the target gradation in the 3D discrete element software PFC3D.

[0067] 1. Uniaxial penetration test of asphalt mixture

[0068] Such as figure 1 As shown, the shear strength of asphalt mixture is determined by this test, and the high temperature stability of asphalt mixture is evaluated. The specific steps are:

[0069] ①According to the selected aggregate gradation, the particle flow discrete element software PFC3D is used to randomly g...

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Abstract

The invention discloses a grading optimization method for an asphalt mixture under virtual state. The method includes the steps of: on the basis of grading that needs to optimize according to practical demand, in three-dimensional discrete element software PFC3D, randomly generating an asphalt mixture mechanical test three-dimensional discrete element model (including uniaxial penetration test, low temperature split test, uniaxial compression test and shear fatigue test) which satisfies a target grading, wherein the generation process of the three-dimensional discrete element model, which satisfies the target grading, is the base of asphalt mixture grading optimization; and comparing mechanical performance evaluation results of various grading to obtain a grading having best mechanical performance. The method has strong operability, convenience and representativeness.

Description

technical field [0001] The invention relates to an asphalt mixture gradation optimization method in a virtual state, belonging to the field of road engineering. Background technique [0002] The composition of asphalt mixture includes four parts: asphalt, aggregate, additive and void, among which aggregate has the greatest influence on the performance of asphalt mixture. The physical properties of aggregates (shape, size, edges, flatness, surface texture, etc.), gradation, and distribution in asphalt mixtures (position, quantity, spacing, azimuth, etc.) all have an impact on asphalt mixtures. It has a significant impact on the mechanical properties, road performance indicators and fatigue life. Among the many factors affecting the performance of asphalt mixture, the gradation of aggregate is the most macroscopic and fundamental. To some extent, aggregate gradation determines the performance of asphalt mixture and affects the road performance and service life of asphalt mix...

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Application Information

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IPC IPC(8): G01N3/24G01N3/08
CPCG01N3/08G01N3/24G01N2203/0067G01N2203/0073
Inventor 彭勇高华
Owner ZHEJIANG UNIV
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