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<p>Although asphalt pavement is common in today’s transportation infrastructure, it is subjected to continuous deterioration due to repeated loading and environmental effects. Self-healing, which refers to the pavement’s natural ability to gradually fix small cracks and damage, is an important aspect of the growing interest. Although referred to as “self-healing”, the phenomenon investigated corresponds to the recovery of interfacial strength between previously cracked surfaces under static loading, predominantly governed by bitumen flow and adhesion, rather than chemical healing at the molecular scale. This study looked at two key topics: the effects of repetitive induction heating and the limitations of the rest period for asphalt mixtures. Three types of mixtures were evaluated: dense, semi-dense, and porous. The findings indicate semi-dense materials provide the optimal balance of long-term durability and rest period self-healing, which makes them ideal for sustainable pavement systems, however dense materials may require more frequent maintenance or additives to improve healing efficiency. Porous materials function effectively for healing, but they require being carefully designed to maintain their mechanical strength. Rest period healing has limitations and does not last the entire life of the mix, depending on the ambient temperature. The mending process takes longer at colder temperatures. Nonetheless, the highest healing rates across temperatures were comparable. On other hand, longer induction heating times enhance healing rates across all materials, emphasizing the importance of treatment conditions. Dense materials perform best under induction heating, followed by semi-dense materials, confirming their appropriateness for applications requiring heating self-healing. Furthermore, the use of self-healing asphalt mixtures has the potential to considerably minimize environmental impact by prolonging pavement life and reducing the need for demanding of resources maintenance activities. This work investigates multiple inductions heating cycles and calculates the time restrictions on rest period healing in a novel way, revealing ideal conditions for dense, semi-dense, and porous combinations.</p>

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Limitations on Hot Mix Asphalt Rest Period Healing and the Impact of Repeated Induction Heating

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Harith K. K. Ajam,
  • Hassanean S. H. Jassim,
  • Hanaa Mohammed Mahan

摘要

Although asphalt pavement is common in today’s transportation infrastructure, it is subjected to continuous deterioration due to repeated loading and environmental effects. Self-healing, which refers to the pavement’s natural ability to gradually fix small cracks and damage, is an important aspect of the growing interest. Although referred to as “self-healing”, the phenomenon investigated corresponds to the recovery of interfacial strength between previously cracked surfaces under static loading, predominantly governed by bitumen flow and adhesion, rather than chemical healing at the molecular scale. This study looked at two key topics: the effects of repetitive induction heating and the limitations of the rest period for asphalt mixtures. Three types of mixtures were evaluated: dense, semi-dense, and porous. The findings indicate semi-dense materials provide the optimal balance of long-term durability and rest period self-healing, which makes them ideal for sustainable pavement systems, however dense materials may require more frequent maintenance or additives to improve healing efficiency. Porous materials function effectively for healing, but they require being carefully designed to maintain their mechanical strength. Rest period healing has limitations and does not last the entire life of the mix, depending on the ambient temperature. The mending process takes longer at colder temperatures. Nonetheless, the highest healing rates across temperatures were comparable. On other hand, longer induction heating times enhance healing rates across all materials, emphasizing the importance of treatment conditions. Dense materials perform best under induction heating, followed by semi-dense materials, confirming their appropriateness for applications requiring heating self-healing. Furthermore, the use of self-healing asphalt mixtures has the potential to considerably minimize environmental impact by prolonging pavement life and reducing the need for demanding of resources maintenance activities. This work investigates multiple inductions heating cycles and calculates the time restrictions on rest period healing in a novel way, revealing ideal conditions for dense, semi-dense, and porous combinations.