Self-healing properties of asphalt concrete containing responsive calcium alginate/nano-Fe₃O₄ composite capsules via microwave irradiation

The responsive calcium alginate/nano-Fe₃O₄(CA@Fe₃O₄) capsules can actively release the inner rejuvenator via the stimulation of microwave, thus being a prospective preventive maintenance method for effectively enhancing the self-healing level of asphalt concrete. In view of this, this paper investigated the self-healing property of asphalt mixture containing CA@Fe₃O₄ composite capsules under the action of microwave. The CA@Fe₃O₄ capsules encapsulating asphalt rejuvenator were fabricated based on reaction principle of ion exchange. Several tests were conducted to characterize the morphological structure, thermal stability, mechanical resistance and relative healing agent content of the capsules. Meanwhile, the spatial distribution and rejuvenator release from the capsules in asphalt mixtures after mixing and compaction process were also explored. Besides, the surface temperature distribution and self-healing capacity of asphalt concrete beams without and with capsules were investigated after microwave action. Meanwhile, the rejuvenator release ratios of capsules within mixture beams were also quantificationally analyzed. The experimental results indicated that the CA@2%Fe₃O₄ capsules showed multi-cavity structure with healing agent stored inside. Meanwhile, the mechanical resistance and thermal stability of the capsules all were up to the manufacturing requirements of asphalt mixtures in laboratory. The asphalt mixtures with CA@2%FevO₄ capsules showed superior healing level under the action of microwave due to the combined effect of thermal induction and rejuvenator healing. In short, the CA@2%Fe₃O₄ capsules can obviously enhance the self-healing capacity of asphalt mixture compared with normal CA capsules.

• Record URL:
  https://doi.org/10.1016/j.conbuildmat.2021.125258
• Record URL:
  http://www.sciencedirect.com/science/article/pii/S0950061821029998
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09500618
• Supplemental Notes:
  • © 2021 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
• Authors:
  • Wan, Pei
  • Wu, Shaopeng
  • Liu, Quantao
  • Xu, Haiqin
  • Wang, Huan
  • Peng, Zhen
  • Rao, Wenhao
  • Zou, Yingxue
  • Zhao, Zenggang
  • Chen, Shuaichao
• Publication Date: 2021-12-6

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Serial:
  • Construction and Building Materials
  • Volume: 310
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 0950-0618
  • Serial URL: http://www.sciencedirect.com/science/journal/09500618?sdc=1

Subject/Index Terms

• TRT Terms: Asphalt additives; Asphalt concrete; Calcium compounds; Microwaves; Repairing
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01788597
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 17 2021 2:29PM