吉林大学学报(工学版) ›› 2022, Vol. 52 ›› Issue (6): 1386-1393.doi: 10.13229/j.cnki.jdxbgxb20210019

• 交通运输工程·土木工程 • 上一篇    

导电沥青及混合料裂缝局部温度场及愈合效果

郭庆林1(),刘强1,吴春利2(),李黎丽1,李懿明1,刘富春1   

  1. 1.河北工程大学 土木工程学院，河北 邯郸 056038
    2.吉林大学 交通学院，长春 130022
  • 收稿日期:2021-01-09 出版日期:2022-06-01 发布日期:2022-06-02
  • 通讯作者: 吴春利 E-mail:guoql@hebeu.edu.cn;clwu@jlu.edu.cn
  • 作者简介:郭庆林（1984-），男，副教授，博士. 研究方向：沥青路面材料. E-mail：guoql@hebeu.edu.cn
  • 基金资助:
    国家自然科学基金项目(51508150);国家重点研发计划项目(2018YFF0300200);河北省自然科学基金项目(E2018402206);河北省教育厅青年拔尖人才计划项目(BJ2017034)

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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摘要：

为探究导电沥青胶浆及混合料裂缝附近区域的导电升温效应，制备了不同配比的导电沥青胶浆及混合料，进行了导电愈合试验，利用红外摄像仪测定了导电沥青胶浆和沥青混合料裂缝周围的温度场。采用图像处理技术定量分析了导电沥青胶浆裂缝愈合水平，同时探讨了沥青混合料的反复愈合性能。结果表明：导电沥青胶浆及混合料温度均随通电时间线性升高，升温速率与材料电阻率呈指数函数关系；导电沥青胶浆及混合料裂缝附近区域温度明显高于其他区域，局部升温明显，局部高温有利于实现裂缝定向愈合；沥青混合料反复愈合水平随断裂次数的增多逐渐降低，愈合温度和通电时间对反复愈合水平具有显著影响；利用愈合前、后电阻率比值可估计导电沥青混合料的愈合效果。

关键词: 道路工程, 导电沥青胶浆, 导电沥青混合料, 裂缝, 温度场, 愈合水平

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

中图分类号: 

  • U416.217

表1

AH-70#沥青主要技术指标"

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

表2

碳纤维技术性能"

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

表3

石墨技术性能"

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

图1

裂缝愈合图像处理过程"

图2

导电胶浆及混合料升温曲线"

图3

导电胶浆及混合料升温速率与电阻率的相关性"

图4

沥青胶浆裂缝附近区域温度场"

图5

导电沥青混合料裂缝周围温度场"

图6

不同配比胶浆试件裂缝愈合水平"

图7

不同工况下沥青混合料愈合水平"

图8

导电沥青混合料反复愈合水平"

图9

愈合水平随愈合前、后电阻率比值的变化关系"

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