Volume 23 Issue 2
Apr.  2023
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2023  >  23(2): 67-77
JI Xiao-ping, YAO Bing-chen, SI Wei, WANG Chao-hui, YI Ke, HE Shu-peng, ZHANG Xue-jun. Self-healing behavior and microscopic mechanism of microencapsulated asphalt[J]. Journal of Traffic and Transportation Engineering, 2023, 23(2): 67-77. doi: 10.19818/j.cnki.1671-1637.2023.02.004
Citation: JI Xiao-ping, YAO Bing-chen, SI Wei, WANG Chao-hui, YI Ke, HE Shu-peng, ZHANG Xue-jun. Self-healing behavior and microscopic mechanism of microencapsulated asphalt[J]. Journal of Traffic and Transportation Engineering, 2023, 23(2): 67-77. doi: 10.19818/j.cnki.1671-1637.2023.02.004
shu

Self-healing behavior and microscopic mechanism of microencapsulated asphalt

doi: 10.19818/j.cnki.1671-1637.2023.02.004
  • 1.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China

Funds:

National Key Research and Development Program of China 2021YFB2601000

National Natural Science Foundation of China 52278430

Fundamental Research Funds for the Central Universities 300102212906

Innovation Capability Support Program of Shaanxi Province 2022TD-07

More Information
  • Author Bio:

    JI Xiao-ping(1982-), male, professor, PhD, jixp82@163.com

    SI Wei(1986-), male, associate professor, PhD, siwei@chd.edu.cn

  • Received Date: 2022-11-20
    Available Online: 2023-05-09
  • Publish Date: 2023-04-25
    Abstract
  • In order to explore the self-healing behavior of microencapsulated asphalt and its influencing factors, microcapsules were prepared by in-situ polymerization, and the micro-mechanism of self-healing behavior of microcapsules was revealed from three aspects: stress-controlled release, capillary action, and diffusion behavior by combining macro-test and micro-test. The pull-heal-pull test of microencapsulated asphalt was carried out, the self-healing rate (the ratio of pulling strength after healing to initial pulling strength) was used as the evaluation index, and the effect rules of microcapsule content and healing time on the self-healing rate were investigated. The dynamic shear rheological test of microencapsulated asphalt was carried out, and the stress-controlled release characteristics of microencapsulated asphalt were investigated by comparing the microstructures of microencapsulated asphalt before and after the fatigue test. The horizontal and vertical capillary action of core material in micro-cracks and the diffusion process of core material in microencapsulated asphalt were visualized by the fluorescence microscope. The healing process of micro-cracks in microencapsulated asphalt was observed by the real-time video recording function in microscopic image software. The release behavior of core material in microencapsulated asphalt was investigated by testing the functional groups of microcapsule core material and microencapsulated asphalt before and after the pull-heal-pull test based on infrared spectrum. Analysis results show that the self-healing rate increases from 16.70% to 48.92% when the microcapsule dosage increases from 0 to 8%, indicating that the self-healing rate of microencapsulated asphalt increases gradually with the increase of microcapsule dosage. When the microcapsule dosage is 4%, the self-healing rate in 120 min is 1.85 times that in 10 min, indicating that the self-healing rate of microencapsulated asphalt increases gradually with the extension of asphalt healing time. Obviously, increasing the load rest period and microcapsule dosage has a positive effect on enhancing the self-healing performance of microencapsulated asphalt. The microscopic self-healing mechanism of microencapsulated asphalt is that the microcapsule shell is punctured under the stress at the tip of the microcrack, then the core healing agent is released, so that the core material flows and diffuses under the drive of capillary force, contacts with nearby asphalt and is soaked, so as to achieve the purpose of repairing asphalt microcracks.

     

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