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<p>The reutilization of reclaimed asphalt pavement (RAP) is impeded primarily by the stiffness and brittleness induced by aging processes, predominantly oxidation and volatilization. This study evaluates the efficacy of using rice bran oil (RBO), a commonly discarded culinary waste, recycled as a novel bio-based rejuvenator through a unique rotary evaporator mixing process to sustainably restore the physicochemical and rheological properties of aged RAP binders and asphalt mixtures. An extensive experimental program investigated RAP binders rejuvenated with varying percentages (3%, 5%, 5.5%, and 6%) of RBO, examining penetration, and softening point for physical; viscosity, Dynamic Shear Rheometer (DSR), and Multiple Stress Creep Recovery (MSCR) for rheological; and Fourier Transform Infrared (FTIR) spectroscopy for chemical properties under originally aged, short-term (RTFO), and long-term (PAV) aging conditions. Results indicated that the 5.5% RBO concentration optimally restored the aged RAP binder, aligning penetration values with a standard 60/70 penetration grade, reduced viscosity by up to 83%, and enhanced workability. Rejuvenated binders exhibited significantly improved fatigue resistance, appropriate rutting resistance, and adequate elasticity for heavy traffic loads, as verified by MSCR testing. FTIR analysis revealed substantial reductions in oxidation indices (carbonyl and sulfoxide peaks), confirming the rejuvenation effects. Evaluation of asphalt mixes&#xa0;demonstrated enhanced compaction, optimal stability-flow balance, and improved volumetric properties, underscoring the practical applicability of the rejuvenated binder. This rejuvenation strategy offers a promising pathway to reducing dependence on virgin materials, minimizing environmental impacts, and enhancing the overall performance of 100% RAP mixtures.</p>

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Performance of Rap Binder Rejuvenated By Recycled Rice Bran Oil and Quantification of its Effect on Mixture

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Joy Podder,
  • Mohammed Russedul Islam,
  • Md Obaidur Rahaman,
  • Shamima Yasmin,
  • Nazmus Sakib,
  • Md Abdullah Al Mamun,
  • Mohammad Imran Hossain

摘要

The reutilization of reclaimed asphalt pavement (RAP) is impeded primarily by the stiffness and brittleness induced by aging processes, predominantly oxidation and volatilization. This study evaluates the efficacy of using rice bran oil (RBO), a commonly discarded culinary waste, recycled as a novel bio-based rejuvenator through a unique rotary evaporator mixing process to sustainably restore the physicochemical and rheological properties of aged RAP binders and asphalt mixtures. An extensive experimental program investigated RAP binders rejuvenated with varying percentages (3%, 5%, 5.5%, and 6%) of RBO, examining penetration, and softening point for physical; viscosity, Dynamic Shear Rheometer (DSR), and Multiple Stress Creep Recovery (MSCR) for rheological; and Fourier Transform Infrared (FTIR) spectroscopy for chemical properties under originally aged, short-term (RTFO), and long-term (PAV) aging conditions. Results indicated that the 5.5% RBO concentration optimally restored the aged RAP binder, aligning penetration values with a standard 60/70 penetration grade, reduced viscosity by up to 83%, and enhanced workability. Rejuvenated binders exhibited significantly improved fatigue resistance, appropriate rutting resistance, and adequate elasticity for heavy traffic loads, as verified by MSCR testing. FTIR analysis revealed substantial reductions in oxidation indices (carbonyl and sulfoxide peaks), confirming the rejuvenation effects. Evaluation of asphalt mixes demonstrated enhanced compaction, optimal stability-flow balance, and improved volumetric properties, underscoring the practical applicability of the rejuvenated binder. This rejuvenation strategy offers a promising pathway to reducing dependence on virgin materials, minimizing environmental impacts, and enhancing the overall performance of 100% RAP mixtures.