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Utilization of reclaimed asphalt pavement (RAP) in pavements reduces the demand for natural resources (aggregates) and the cost of construction, thus paving the way towards sustainability. The rejuvenator added to RAP-containing mixtures rejuvenates the aged bitumen and thereby restores the initial properties of aged binder, leading to improved pavement performance. This study is about deducing the maximum RAP content to prepare semi-flexible asphalt (SFA) mixtures by injecting cement-based grout into open-graded asphalt (OGA) mixtures without compromising the performance of SFA mixtures. The SFA mixtures exhibit a unique blend of the flexibility of asphalt pavements and the high-strength properties of concrete pavements. The study employed various RAP percentages (0–100%), neat asphalt binder percentages and rejuvenator percentages (0–8%) to prepare the OGA mixtures with 20–35% air void content. Experimental tests were conducted, including Marshall tests, Indirect tensile strength and Cantabro, to examine the characteristics of the OGA mixtures. The OGA mixture with 25% RAP content and 4–6% rejuvenator is found to be optimum in this study.

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Utilization of RAP Material in Semi-Flexible Asphalt Mixture

  • 会议论文

  • 发表日期：

    2026年

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  • S. R. Shashank,
  • Doma Hemanth Kumar,
  • Mithun Mohan

摘要

Utilization of reclaimed asphalt pavement (RAP) in pavements reduces the demand for natural resources (aggregates) and the cost of construction, thus paving the way towards sustainability. The rejuvenator added to RAP-containing mixtures rejuvenates the aged bitumen and thereby restores the initial properties of aged binder, leading to improved pavement performance. This study is about deducing the maximum RAP content to prepare semi-flexible asphalt (SFA) mixtures by injecting cement-based grout into open-graded asphalt (OGA) mixtures without compromising the performance of SFA mixtures. The SFA mixtures exhibit a unique blend of the flexibility of asphalt pavements and the high-strength properties of concrete pavements. The study employed various RAP percentages (0–100%), neat asphalt binder percentages and rejuvenator percentages (0–8%) to prepare the OGA mixtures with 20–35% air void content. Experimental tests were conducted, including Marshall tests, Indirect tensile strength and Cantabro, to examine the characteristics of the OGA mixtures. The OGA mixture with 25% RAP content and 4–6% rejuvenator is found to be optimum in this study.