Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (6): 1386-1393.doi: 10.13229/j.cnki.jdxbgxb20210019

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Local temperature field and healing level of crack in conductive asphalt and mixture

Qing-lin GUO1(),Qiang LIU1,Chun-li WU2(),Li-li LI1,Yi-ming LI1,Fu-chun LIU1   

  1. 1.School of Civil Engineering，Hebei University of Engineering，Handan 056038，China
    2.College of Transportation，Jilin University，Changchun 130022，China
  • Received:2021-01-09 Online:2022-06-01 Published:2022-06-02
  • Contact: Chun-li WU E-mail:guoql@hebeu.edu.cn;clwu@jlu.edu.cn

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Abstract:

In order to explore the conductive heating characteristics of conductive asphalt and mixture near the crack， conductive asphalt and mixture with different proportions were prepared and the conductive healing test was conducted. An infrared camera was used to measure the temperature field around the crack. Digital image processing technology was used to quantitatively analyze the healing level of conductive asphalt. The repeated healing properties of asphalt mixture were analyzed. Results show that the temperature of conductive asphalt and mixture both linearly increase with the charging time. There is an exponential function relationship between the heating rate and electrical resistivity. The temperature of the area near the crack of conductive asphalt and mixture is notably higher than that of others， and the local temperature rise obviously. The local high temperature is conducive to realize the target healing of cracks. The repeated healing index of asphalt mixture gradually decreases with the increasing of fracture cycles. The healing temperature and electrifying time have significant effects on the healing index. The ratio of resistivity before and after healing can be used to estimate the healing level of conductive asphalt mixture.

Key words: road engineering, conductive asphalt binder, conductive asphalt concrete, cracks, temperature field, healing level

CLC Number: 

  • U416.217

Table 1

Properties of AH-70# asphalt"

技术指标试验结果规范要求
针入度/（0.1 mm）6860~80
软化点/℃48>45
延度（15 ℃）/cm>100>100

Table 2

Properties of carbon fiber"

性能指标实测值
线密度/（g?m-1）0.8
抗拉强度/MPa>3500
碳含量/%>95
电阻率/（Ω?m）9.785×10-5

Table 3

Properties of graphite"

指标实测值
密度/（g?cm-3）2.15
形状鳞片状
固定碳/%98.6
水分/%0.36
挥发分/%0.36

Fig.1

Image processing of crack healing"

Fig.2

Temperature rising curves of conductive asphalt binder and mixture"

Fig.3

Correlation between heating rate and electrical resistivity of conductive binder and mixture"

Fig.4

Temperature field of asphalt binderaround crack"

Fig.5

Temperature field of conductive asphaltmixture around crack"

Fig.6

Healing index of binder specimens withdifferent proportions"

Fig.7

Healing index of asphalt mixture underdifferent conditions"

Fig.8

Repeated healing index of conductive asphalt mixture"

Fig.9

Relationship between healing level and resistivity ratio before and after healing"

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