Study on the Self-Healing Performance of Microcapsules and Microcapsule-Containing Asphalt

Jinzhao Jin, Yongzhe Miao, Huaiwu Zhao, Jiao Chen, Longbang Qing, Ru Mu (), Xiangshang Chen and Zixiang Li
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Jinzhao Jin: Hebei Xiongan Rongwu Highway Co., Ltd., Xiongan New Area, Baoding 071700, China
Yongzhe Miao: School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
Huaiwu Zhao: The 5th Engineering Co., Ltd., China Railway 18th Bureau Group Co., Ltd., Tianjin 300459, China
Jiao Chen: School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
Longbang Qing: School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
Ru Mu: School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
Xiangshang Chen: School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
Zixiang Li: School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China

Sustainability, 2022, vol. 14, issue 19, 1-12

Abstract: Mixing microcapsules encapsulating asphalt recycling agents into asphalt can effectively enhance its self-healing performance and alleviate the brittle cracking of pavements due to asphalt aging. In practical engineering applications, microcapsules should have good thermal stability, mechanical properties, and uniform dispersion in asphalt or asphalt concrete, for the effective self-healing of micro-cracks which occur as pavements age. The self-healing performance of microcapsule-containing asphalt is affected by several factors. First, the thermal stability, mechanical properties, and dispersibility of microcapsules in the asphalt were investigated by thermogravimetric analysis, nanoindentation tests, and fluorescence microscopy. Then, the effects of the microcapsules’ content, temperature, time, degree of damage, and self-healing times on the self-healing performance of microcapsule-containing asphalt were investigated through two-stage fatigue loading tests. The results show that the microcapsules have good thermal stability, mechanical properties, and dispersibility. They will not thermally decompose when mixing the asphalt concrete, nor will they fracture in the early stages of a pavement’s lifetime, or agglomerate in the asphalt. Mixing microcapsules in asphalt effectively improves its self-healing performance. The self-healing index of microcapsule-containing asphalt increases and then decreases with the increase in microcapsule content. It also increases as the temperature and length of time increases, but it decreases as the degree of damage worsens, and thus, the self-healing time increases.

Keywords: microcapsules; asphalt; self-healing performance; contributory factor (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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