High-temperature performance virtual track test method for asphalt mixture

A technology of asphalt mixture and rutting test, which is applied in the direction of material inspection, analysis of materials, strength characteristics, etc., can solve the problems of capital consumption, shortened test cycle, poor test repeatability and reproducibility, and avoid the deviation of the position of the test piece , avoid abnormal fluctuations, and shorten the test period

Inactive Publication Date: 2018-12-11
NANJING INST OF TECH
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  • Application Information

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Problems solved by technology

[0005] Technical problem: In order to solve the shortcomings of physical test instruments that are faced with the evaluation of high-temperature performance of asphalt mixtures, such as expensive physical test equipment, large space occupation, large capital expenditure, long test period, and poor test repeatabilit...

Method used

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  • High-temperature performance virtual track test method for asphalt mixture
  • High-temperature performance virtual track test method for asphalt mixture
  • High-temperature performance virtual track test method for asphalt mixture

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Experimental program
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Effect test

Embodiment 1

[0037] A kind of asphalt mixture high temperature performance virtual rutting test method of the present invention comprises the following steps:

[0038] (1) Material mix ratio parameter input: According to the laboratory mix ratio test results of asphalt mixture AC-13, the mass of coarse aggregates of 13.2~16mm, 9.5~13.2mm, 4.75~9.5mm, 2.36~4.75mm, etc. are obtained and void ratio, and calculate the volume of coarse aggregate at each level according to the aggregate density, which provides key parameters for subsequent reconstruction of virtual rutting specimens;

[0039] (2) Reconstruction of the virtual rut specimen: firstly, the "wall" is used to construct the size space of the asphalt mixture rut specimen of 300mm×300mm×50mm, and then it is retrieved from the constructed three-dimensional coarse aggregate particle library with real morphological characteristics And put various grades of coarse aggregate into the size space of the virtual specimen to generate coarse aggre...

Embodiment 2

[0058] A virtual rutting test method for asphalt mixture high temperature performance, comprising the following steps:

[0059] (1) Material mix ratio parameter input: According to the laboratory mix ratio test results of asphalt mixture AC-20, 19~26.5mm, 16~19mm, 13.2~16mm, 9.5~13.2mm, 4.75~9.5mm, 2.36~ 4.75mm and other grades of coarse aggregate mass and void ratio, and calculate the volume of each grade of coarse aggregate according to the aggregate density, providing key parameters for subsequent reconstruction of virtual rutting specimens;

[0060] (2) Reconstruction of the virtual rut specimen: firstly, the "wall" is used to construct the size space of the asphalt mixture rut specimen of 300mm×300mm×50mm. Then, it is retrieved from the constructed three-dimensional coarse aggregate particle library with real morphological characteristics and placed in the size space of the virtual specimen to generate coarse aggregate with the target gradation and volume, and carry out r...

Embodiment 3

[0079] A virtual rutting test method for asphalt mixture high temperature performance, comprising the following steps:

[0080] (1) Material mix ratio parameter input: According to the on-site mix ratio of asphalt mixture AC-25, 26.5~31.5mm, 19~26.5mm, 16~19mm, 13.2~16mm, 9.5~13.2mm, 4.75~9.5mm, 2.36-4.75mm and other coarse aggregate mass and void ratio, and calculate the volume of each grade of coarse aggregate according to the aggregate density, providing key parameters for subsequent reconstruction of virtual rut specimens;

[0081] (2) Reconstruction of the virtual rut specimen: firstly, the "wall" is used to construct the size space of the asphalt mixture rut specimen of 300mm×300mm×70mm. Then, it is retrieved from the constructed three-dimensional coarse aggregate particle library with real morphological characteristics and placed in the size space of the virtual specimen to generate coarse aggregate with the target gradation and volume, and carry out rough collection. ...

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Abstract

The invention discloses a high-temperature performance virtual track test method for an asphalt mixture. The method comprises the following steps: inputting material mix proportion parameters; reconstructing a virtual track test piece; inputting parameters of a material micromodel; setting a virtual test loading environment; setting a virtual test monitoring system; operating a virtual test; and post-processing virtual test data. A discrete element method adopted by the high-temperature performance virtual track test method for the asphalt mixture is suitable for analyzing large deformation ofa discontinuous medium material and a particle material, in particular analyzing and evaluating high-temperature performance of the asphalt mixture. The test result is reliable, the test period can be shortened greatly, the test cost is lowered, and the problem that the test is limited by site and time is solved. Meanwhile, the test process can be replayed, repeated and reproduced, so that the scientific research and teaching efficiency is improved greatly.

Description

technical field [0001] The invention relates to the technical field of asphalt mixture virtual test, in particular to a virtual rutting test method for high temperature performance of asphalt mixture. Background technique [0002] With the rapid development of my country's economy, the construction of expressways has advanced by leaps and bounds. Due to its high degree of construction mechanization and excellent performance, asphalt pavement has not only become the main pavement structure of expressways in my country, but also has been widely used on roads of all grades. . However, in recent years, the traffic volume of my country's highways has increased rapidly and has become heavy-duty. Rutting has become one of the main diseases of asphalt pavement, which seriously affects the driving safety and comfort of drivers. Based on this, road workers at home and abroad have done a lot of research work on the high-temperature performance of asphalt mixtures, among which the rutti...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N33/42
CPCG01N3/08G01N33/42G01N2203/0208
Inventor 张德育黄子珍王丹华马涛
Owner NANJING INST OF TECH
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