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Asphalt aging evaluation method based on AC impedance spectrum

A technology of AC impedance spectroscopy and aging assessment, applied in material resistance, measuring devices, instruments, etc., can solve the problems of non-asphalt aging assessment and monitoring, and achieve the effect of fast test speed, simple data analysis process and less sample consumption.

Pending Publication Date: 2021-07-02
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There is no prior art that proposes to evaluate and monitor the aging of asphalt through the measured impedance

Method used

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  • Asphalt aging evaluation method based on AC impedance spectrum
  • Asphalt aging evaluation method based on AC impedance spectrum
  • Asphalt aging evaluation method based on AC impedance spectrum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] according to Figure 7 The flow chart shown is to test the AC impedance of the base asphalt, and the specific process is as follows:

[0042] (1) Add excess anhydrous magnesium sulfate to chloroform, let it stand for 8 hours in a dark environment, and obtain dry chloroform after repeated filtration.

[0043](2) Weigh 0.015g of original asphalt, short-term and long-term thermo-oxidative aging matrix pitch and dissolve them in 5ml of chloroform, and place the matrix pitch-chloroform solution in an ultrasonic disperser to completely dissolve the matrix pitch. The bitumen concentration was 0.003 g / ml.

[0044] (3) Weigh 1.16229g of tetrabutylammonium hexafluorophosphate and dissolve it in 15ml of chloroform, and place the tetrabutylammonium hexafluorophosphate-chloroform in an ultrasonic disperser to make tetrabutylammonium hexafluorophosphate It is completely dissolved, and the concentration of tetrabutylammonium hexafluorophosphate is 0.2mol / L.

[0045] (4) Mix the sol...

Embodiment 2

[0051] AC Impedance Test of Base Bitumen as Original and After Short and Long-term Aging

[0052] The test amplitude is set to 0.005V, the high frequency is 100KHZ, and the low frequency is 100HZ, and the impedance test of the matrix asphalt before and after short-term and long-term aging is carried out in the same test method as in Example 1. Depend on figure 1 (b) and Table 1, it can be seen that under the test parameter conditions, the R Ω +R ct 1.73×10 4 Ω, 1.68×10 4 Ω and 1.56×10 4 Ω.

Embodiment 3

[0054] AC Impedance Test of Base Bitumen as Original and After Short and Long-term Aging

[0055] The test amplitude is set to 0.0075V, the high frequency is 1000KHZ, and the low frequency is 10HZ, and other tests are performed on the matrix asphalt before and after short-term and long-term aging with the same test method as in Example 1. Depend on figure 1 (c) and Table 1, it can be seen that under the test parameter conditions, the R Ω +R ct 1.71×10 4 Ω, 1.67×10 4 Ω and 1.52×10 4 Ω.

[0056] By comparing the impedance values ​​of matrix asphalt before and after short-term and long-term aging under three test parameters (as shown in Table 1), it is found that the R of matrix asphalt Ω +R ct The values ​​show a gradually decreasing trend with the deepening of the aging degree. Compared with the original matrix asphalt, the R Ω +R ct Respectively decreased by 3% and 11%, so the aging degree of matrix asphalt can be judged according to the change of impedance value.

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Abstract

The invention discloses an asphalt aging evaluation method based on an AC impedance spectrum, which belongs to the technical field of road engineering. The method comprises the following steps of preparing asphalt samples with different aging degrees and an electrolyte into a mixed solution, testing the impedance value of the mixed solution to obtain AC impedance spectrograms of the asphalt samples with different aging degrees, and using the impedance value for evaluating the aging degree of the asphalt sample. According to different degrees of change of impedance before and after asphalt aging, the AC impedance testing method has the advantages of simplicity in operation, low cost, high testing speed and the like, and the problems that the asphalt aging degree is difficult to determine quickly and the current asphalt aging research method is long in consumed time, poor in the repeatability of experimental results, large inthe amount of required samples and the like can be solved, and a new method is provided for monitoring the aging degree of asphalt.

Description

technical field [0001] The invention belongs to the field of asphalt aging detection, and in particular relates to an asphalt aging evaluation method based on AC impedance spectroscopy. Background technique [0002] A series of irreversible physical and chemical changes in asphalt under the action of external environment and vehicle load during construction and use lead to asphalt aging. The aging of asphalt can cause the rheological properties of asphalt to deteriorate and affect the service life of asphalt pavement. The research on asphalt aging performance is the premise and key of pavement maintenance and regeneration design. Knowing the aging condition of asphalt pavement in a timely manner will help reduce environmental pollution, realize resource reuse, reduce maintenance costs, and increase the service life of the pavement. [0003] The current asphalt aging research method is mainly based on the change of asphalt performance before and after aging and various micro...

Claims

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Application Information

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IPC IPC(8): G01N27/06G01N27/416
CPCG01N27/06G01N27/416
Inventor 梁波王晓锋郑健龙张海涛
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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