Method for detecting freezing-thawing damage to asphalt mixture based on microcosmic strain energy distribution

A technology of asphalt mixture and detection method, which is applied in the fields of analyzing materials, measuring devices, and using wave/particle radiation for material analysis, etc. The effect of convenient detection method

Inactive Publication Date: 2019-11-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the freeze-thaw damage evaluation methods at the present stage are all destructive tests, and the characterization of freeze-thaw damage has a certain inaccuracy, and a kind of asphalt based on mesoscopic strain energy distribution is proposed. Detection method of freeze-thaw damage of mixture

Method used

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  • Method for detecting freezing-thawing damage to asphalt mixture based on microcosmic strain energy distribution
  • Method for detecting freezing-thawing damage to asphalt mixture based on microcosmic strain energy distribution
  • Method for detecting freezing-thawing damage to asphalt mixture based on microcosmic strain energy distribution

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specific Embodiment approach 1

[0031] Specific implementation mode one: as figure 1 As shown, the method for detecting freeze-thaw damage of asphalt mixture based on mesoscopic strain energy distribution described in this embodiment includes the following steps:

[0032] Step 1, prepare the asphalt mixture test piece;

[0033] Step 2, using CT tomography technology to perform tomography on the asphalt mixture specimen in the initial state, and obtain the scanning results;

[0034] According to the obtained scanning results, the CT reconstruction software is used to reconstruct the three-dimensional asphalt mixture specimen, and output the tomographic image of the asphalt mixture specimen in the initial state;

[0035] Perform a freeze-thaw cycle test:

[0036] Step 3. Saturation of the asphalt mixture specimen with water T in an environment with a vacuum degree of P 1 time, and then seal the test piece after water saturation, and seal the test piece at a temperature of Q 1 Place T in the environment 2 ...

specific Embodiment approach 2

[0049] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: the specific process of the step one is:

[0050] According to the requirements of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), asphalt mixture specimens with a diameter of 100 ± 0.2 mm and a height of 63.5 ± 1.3 mm were prepared according to the standard molding method.

specific Embodiment approach 3

[0051] Specific embodiment three: the difference between this embodiment and specific embodiment two is that in said step two, CT tomography technology is used to perform tomographic scanning on the asphalt mixture specimen in the initial state, the scanning voltage is 180kV, and the scanning current is 110mA , the scanning time is 50min.

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Abstract

The invention discloses a method for detecting freezing-thawing damage to an asphalt mixture based on microcosmic strain energy distribution, and belongs to the technical field of transportation engineering. The method solves the problems that freezing-thawing damage evaluation methods at the current stage are all destructive tests, and it is difficult to explain the destructive effect of freezingand thawing on asphalt mixtures from the aspect of the mechanism of freezing-thawing damage. The method comprises the following specific steps of 1, preparing a sample; 2, obtaining an initial samplecomputed tomography image; 3, carrying out a freezing-thawing test; 4, obtaining a computed tomography image after freezing-thawing damage; 5, repeating the process from the third step to the fourthstep, and obtaining computed tomography images under different freezing-thawing cycle frequencies; 6, extracting strain distribution; 7, calculating average strain energy and evaluating the freezing-thawing damage. The method can be applied to freezing-thawing damage detection on asphalt mixture test pieces.

Description

technical field [0001] The invention belongs to the technical field of transportation engineering, and in particular relates to a detection method for freeze-thaw damage of asphalt mixture. Background technique [0002] Seasonally frozen areas are widely distributed in my country, and freeze-thaw damage is the main form of early damage to asphalt pavement in this area. On the one hand, the liquid water inside the asphalt pavement condenses under the condition of sudden temperature drop, the volume expands, and the huge frost heaving force leads to the destruction of the asphalt pavement structure; on the other hand, the transmission of liquid water inside the asphalt mixture reduces the asphalt mortar. The bonding strength with the aggregate is macroscopically manifested as the dropping and loosening of the asphalt pavement, and gradually develops into road pits and other diseases. At present, the evaluation of the freeze-thaw damage of asphalt mixture is mainly characteriz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/046
CPCG01N23/046
Inventor 徐慧宁石浩田雨王梦
Owner HARBIN INST OF TECH
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