ORIGINAL RESEARCH article
Front. Built Environ.
Sec. Transportation and Transit Systems
Volume 11 - 2025 | doi: 10.3389/fbuil.2025.1629147
This article is part of the Research TopicAdvancements and Applications of Balanced Mix Design (BMD) In Asphalt Pavement Engineering: Towards Sustainable And Resilient InfrastructureView all 3 articles
Study on the Self-Healing Behavior and Rheological Properties of Carbonyl Iron Powder-Modified Asphalt Mastic Induced by Microwave Heating
Provisionally accepted
- 1Inner Mongolia Agricultural University, Hohhot, China
- 2Inner Mongolia Transportation Group Co, Hohhot, China
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To overcome the limitations associated with large particle size wave-absorbing materials in asphalt mixtures, this study introduces micron-scale carbonyl iron powder as a functional filler. By volumetrically substituting mineral filler, microwave-responsive asphalt mastic was developed. Six groups of carbonyl iron powder-modified asphalt mastic with varying replacement ratios were prepared. Rheological tests and indoor microwave heating experiments were conducted to investigate the variations in rheological properties and microwave-induced healing characteristics across different replacement ratios. The optimal replacement ratio was identified through a comprehensive evaluation of thermal, rheological, and healing performances, and the mechanism by which microwave induction enhances the healing effect of carbonyl iron powder in the modified asphalt mastic was elucidated. The results demonstrate that carbonyl iron powder enhances the fluidity, heating rate, and self-healing capacity of modified asphalt mastic. The high-temperature flow performance of carbonyl iron powder-modified asphalt mastic progressively improves with increasing replacement ratio; however, excessive replacement adversely affects low-temperature performance. The optimal healing efficiency and flow state are observed at 50℃. Grey correlation analysis yielded equal volume replacement of 20% as the optimal replacement ratio, with a warming rate of 1.298°C/s, which was able to meet the healing temperature requirements. Following a 20% volumetric replacement of mineral filler with carbonyl iron powder, the modified asphalt mastic exhibited an approximate 21% increase in instantaneous healing rate (R0) under microwave irradiation. This enhancement is attributed to the improved fluidity and microwave absorption heating capacity imparted by the carbonyl iron powder.
Keywords: asphalt mastic, Carbonyl iron powder, Microwave induction, Rheological properties, Self-healing behavior
Received: 15 May 2025; Accepted: 11 Jun 2025.
Copyright: © 2025 Zhao, Yan, Mi, Gao and Li. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Yongxiang Li, Inner Mongolia Agricultural University, Hohhot, China
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