Method for determining diffusion coefficient of moisture in asphalt film

A diffusion coefficient and measurement method technology, applied in the field of material testing, can solve the problems of expensive test equipment, difficult data analysis, high cost, etc., and achieve the effect of simple test operation and intuitive and reliable test process

Inactive Publication Date: 2020-09-18
山西省交通科技研发有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

The test process of this method needs to interrupt the water absorption and take out the sample for measurement, and the accuracy of the test result is poor
2) Infrared spectrum-attenuated total reflection method is used to measure the thickness of asphalt film 3000cm -1 ~3650cm -1 The intensity of the stretching vibration peak of the hydroxyl group can be used to indirectly characterize and calculate the water molecule content in the asphalt film; the test equipment is expensive, and the sample preparation technology is difficult
3) The Diffusion-Through method indirectly characterizes the amount of water-soluble components in asphalt by measuring the content of the precipitated radioactive tracer, and then characterizes the diffusion behavior of water in asphalt; this method is inconvenient to operate and has high cost and environmental hazards. pollution and other issues
4) The electrochemical impedance method is a method for measuring the diffusion behavior of water in the asphalt film disclosed in the patent "A Method for Characterizing the Diffusion Behavior of Water in Asphalt" (CN 103900934 A). The method is based on the dielectric constant of water and asphalt For characteristics with large differences, the dielectric constant of asphalt at different immersion times is measured to indirectly characterize and analyze the diffusion behavior of water in asphalt; the test process of this method is complicated, the amount of measured data is large, and the data analysis is difficult
The above methods are all based on different test principles, and indirectly characterize the diffusion behavior of water in the asphalt film, and cannot directly give the calculation method of the important index of the diffusion coefficient of water in the asphalt film

Method used

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  • Method for determining diffusion coefficient of moisture in asphalt film
  • Method for determining diffusion coefficient of moisture in asphalt film
  • Method for determining diffusion coefficient of moisture in asphalt film

Examples

Experimental program
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Embodiment 1

[0026] (1) Set the temperature of the water bath to 25°C or other temperature required by the test, and turn on the heating and cooling cycle mode to ensure that the temperature of the water bath is constant during the test.

[0027] (2) Use an electronic balance with an accuracy of 0.1 mg to measure and record the mass of the aluminum sheet carrier; the side wall of the aluminum sheet carrier is coated with a vaseline release agent; the asphalt is heated to 150-160°C and poured on an aluminum sheet of 50mm×50mm×5mm, using Scrape the surface of the asphalt sample with a scraper to keep the thickness uniform; after the asphalt sample is cooled to room temperature, remove the excess asphalt on the side wall of the aluminum sheet carrier for later use.

[0028] (3) Use an electronic balance with an accuracy of 0.1 mg to measure and record the mass of the asphalt membrane aluminum sheet carrier, and further calculate the initial mass of the asphalt membrane before immersion m 0 , ...

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Abstract

The invention discloses a method for determining the diffusion coefficient of moisture in an asphalt film, and relates to an asphalt sample preparation step, a moisture diffusion test step and a datafitting analysis step. The diffusion coefficient of the moisture in the asphalt film under different temperature conditions can be directly measured and calculated, the test operation is simple and feasible, the test process is intuitive and reliable, and a test research basis is provided for the diffusion behavior of the moisture in the asphalt film and the water damage mechanism analysis of theasphalt mixture.

Description

technical field [0001] The invention belongs to the technical field of material detection, in particular to a method for measuring the diffusion coefficient of water in asphalt membranes. Background technique [0002] Asphalt pavement water damage has become a major mode of early damage to highway asphalt pavement. Under the repeated action of vehicle load on the asphalt pavement, the moisture entering the pavement gap continuously generates hydrodynamic pressure or vacuum negative pressure suction, and the moisture gradually penetrates into the interface between the asphalt and the aggregate, resulting in a decrease in the adhesion of the asphalt and a gradual loss of cohesion, thus making the The asphalt film peels off from the surface of the aggregate, and then forms pits, looseness and other diseases on the asphalt pavement. The water damage process of asphalt pavement is very complex, involving thermodynamics, chemistry, physics and mechanical effects. The damage proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00
CPCG01N13/00G01N2013/003
Inventor 成志强孔繁盛王瑞林王国忠李亚龙畅晓钰兰建丽张敏周亚军杨健民
Owner 山西省交通科技研发有限公司
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