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<p>The premature deterioration of asphalt pavements, combined with increasing environmental concerns necessitate for the development of long lasting and sustainable asphalt mixtures. This study investigates the potential of nanoclay-modified binders to improve the performance of asphalt mixtures incorporating high proportions (20–50%) of Reclaimed Asphalt Pavement (RAP). The novelty of this study lies in integrating nanomaterials with recycled materials to enhance both mechanical properties and environmental performance. A comprehensive laboratory investigation was carried out including Indirect Tensile Strength (ITS), Resilient Modulus (Mr), Immersion Type Wheel Rutting Test (ITWRT), and Tensile Strength Ratio (TSR) to asses strength, deformation resistance, and moisture susceptibility. Additionally, the ROADEO tool was employed to estimate greenhouse gas (GHG) emissions across material production and construction stages. The optimal mix, MM30R (30% RAP with 4% nanoclay), demonstrated a double fold increase in ITS and a 26% improvement in Mr compared to the conventional mix. It also showed a 40% reduction in rut depth and considerable enhancement against moisture damage indicating significantly improved service life under moisture-prone and high-traffic conditions. The life cycle assessment revealed a 33% reduction in GHG emissions and more than 40% material savings, without compromising structural adequacy. These findings highlight the potential of nanoclay-modified binders to enable the production of sustainable, durable, and resource-efficient RAP-based asphalt mixtures, aligning with the goals of environmentally responsible infrastructure development.</p> Graphical abstract <p></p>

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Synergistic effect of nanoclay-modified binders and RAP material on performance and emission reduction in hot mix asphalt

  • 期刊论文

  • 发表日期：

    2025年9月20日

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  • Sambasiva Rao Ganjikunta,
  • Bhuvana Priya Dhandapani,
  • Ramesh Adepu,
  • Ramya Sri Mullapudi

摘要

The premature deterioration of asphalt pavements, combined with increasing environmental concerns necessitate for the development of long lasting and sustainable asphalt mixtures. This study investigates the potential of nanoclay-modified binders to improve the performance of asphalt mixtures incorporating high proportions (20–50%) of Reclaimed Asphalt Pavement (RAP). The novelty of this study lies in integrating nanomaterials with recycled materials to enhance both mechanical properties and environmental performance. A comprehensive laboratory investigation was carried out including Indirect Tensile Strength (ITS), Resilient Modulus (Mr), Immersion Type Wheel Rutting Test (ITWRT), and Tensile Strength Ratio (TSR) to asses strength, deformation resistance, and moisture susceptibility. Additionally, the ROADEO tool was employed to estimate greenhouse gas (GHG) emissions across material production and construction stages. The optimal mix, MM30R (30% RAP with 4% nanoclay), demonstrated a double fold increase in ITS and a 26% improvement in Mr compared to the conventional mix. It also showed a 40% reduction in rut depth and considerable enhancement against moisture damage indicating significantly improved service life under moisture-prone and high-traffic conditions. The life cycle assessment revealed a 33% reduction in GHG emissions and more than 40% material savings, without compromising structural adequacy. These findings highlight the potential of nanoclay-modified binders to enable the production of sustainable, durable, and resource-efficient RAP-based asphalt mixtures, aligning with the goals of environmentally responsible infrastructure development.

Graphical abstract