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<p>This study proposes a policy-driven lifecycle management framework for Reclaimed Asphalt Pavement (RAP) that combines material performance with carbon emission mitigation. By combining laboratory tests and a multi-stage Life Cycle Assessment model, we evaluate four recycling techniques (PMCR, PMHR, CIPR, HIPR) under varying RAP ratios (30%-70%). The results show that at a low dosage, the Plant-Mixed Hot Regeneration method (PMHR) has the highest carbon emissions, while the Plant-Mixed Cold Regeneration method (PMCR), which has the lowest emissions, reduces carbon emissions by approximately 25% compared to PMHR. As the RAP content increases, the carbon emissions decrease. However, an excessively high content may weaken the low-temperature crack resistance and water stability of the mixture. When the RAP content is controlled at 30%-50%, the performance of the asphalt mixture can be maintained and the emissions can be relatively low. Based on this, the proposed “RAP content grading optimization” strategy can be adopted in cold region engineering. For main road applications, 30%-50% of the RAP content can be utilized in PMCR technology, while for low-load roads, the RAP content can be increased to 70%, and adopt Hot In-Place Recycling (HIPR) technology to reduce emissions (approximately 20% lower than PMCR).</p>

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Life cycle carbon emissions and performance trade-offs in recycled asphalt pavements for cold regions: a multi-technique optimization framework

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Yongcheng Ji,
  • Shutong Wen,
  • Yanbo Zhao,
  • Wei Li,
  • Wenyuan Xu

摘要

This study proposes a policy-driven lifecycle management framework for Reclaimed Asphalt Pavement (RAP) that combines material performance with carbon emission mitigation. By combining laboratory tests and a multi-stage Life Cycle Assessment model, we evaluate four recycling techniques (PMCR, PMHR, CIPR, HIPR) under varying RAP ratios (30%-70%). The results show that at a low dosage, the Plant-Mixed Hot Regeneration method (PMHR) has the highest carbon emissions, while the Plant-Mixed Cold Regeneration method (PMCR), which has the lowest emissions, reduces carbon emissions by approximately 25% compared to PMHR. As the RAP content increases, the carbon emissions decrease. However, an excessively high content may weaken the low-temperature crack resistance and water stability of the mixture. When the RAP content is controlled at 30%-50%, the performance of the asphalt mixture can be maintained and the emissions can be relatively low. Based on this, the proposed “RAP content grading optimization” strategy can be adopted in cold region engineering. For main road applications, 30%-50% of the RAP content can be utilized in PMCR technology, while for low-load roads, the RAP content can be increased to 70%, and adopt Hot In-Place Recycling (HIPR) technology to reduce emissions (approximately 20% lower than PMCR).