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<p>The objective of this research was to optimize the synthesis parameters of rice husk ash derived warm-mix asphalt (RHA-WMA) additive to further maximize its foaming capability and evaluate the temperature reduction potential along with assessing the laboratory performance of RHA-WMA-modified asphalt mixtures. The scope included optimization of the RHA-WMA additive synthesis involving sixteen zeolites, physicochemical characterization of the optimized RHA-WMA additive, evaluation of temperature reduction potential and mechanical performance using three asphalt mixtures: control hot-mix asphalt (HMA), a commercial WMA additive, and optimized RHA-WMA, encompassing 170 samples. The optimized RHA-WMA additive synthesized at a crystallization temperature of 110°C, reaction time of 1 h, and aging conditions of 70 °C for 1 h with sodium and potassium hydroxide displayed a water content of about 23%, in-line with the commercial additives. Compactability tests demonstrated that the RHA-WMA mixtures optimized at 0.6% by weight of the total mix achieved a reduction of about 20 °C in the production temperatures. |E*| dynamic modulus master curves indicated that RHA-WMA mixtures retained stiffness similar to conventional HMA at high temperatures and relatively lower stiffness at lower temperatures, thus resisting rutting and low-temperature thermal cracking. Further, the RHA-WMA mixtures exhibited a relatively higher resilient modulus and an improved resistance to moisture damage compared to the commercial WMA-modified mixtures. However, the flow number results indicated potential limitations of RHA-WMA mixtures under high-traffic conditions. It is envisioned that this study would help advance the circular economy principles in pavement applications by fostering the utilization of agricultural wastes and their derivatives.</p>

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Rice Husk Ash-Derived Foaming Warm-Mix Asphalt Additive: Material Optimization and Mixture Performance Assessment

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Yeronika Gummadi,
  • Sri Gangadhar Mattaparthi,
  • Krishna Prapoorna Biligiri

摘要

The objective of this research was to optimize the synthesis parameters of rice husk ash derived warm-mix asphalt (RHA-WMA) additive to further maximize its foaming capability and evaluate the temperature reduction potential along with assessing the laboratory performance of RHA-WMA-modified asphalt mixtures. The scope included optimization of the RHA-WMA additive synthesis involving sixteen zeolites, physicochemical characterization of the optimized RHA-WMA additive, evaluation of temperature reduction potential and mechanical performance using three asphalt mixtures: control hot-mix asphalt (HMA), a commercial WMA additive, and optimized RHA-WMA, encompassing 170 samples. The optimized RHA-WMA additive synthesized at a crystallization temperature of 110°C, reaction time of 1 h, and aging conditions of 70 °C for 1 h with sodium and potassium hydroxide displayed a water content of about 23%, in-line with the commercial additives. Compactability tests demonstrated that the RHA-WMA mixtures optimized at 0.6% by weight of the total mix achieved a reduction of about 20 °C in the production temperatures. |E*| dynamic modulus master curves indicated that RHA-WMA mixtures retained stiffness similar to conventional HMA at high temperatures and relatively lower stiffness at lower temperatures, thus resisting rutting and low-temperature thermal cracking. Further, the RHA-WMA mixtures exhibited a relatively higher resilient modulus and an improved resistance to moisture damage compared to the commercial WMA-modified mixtures. However, the flow number results indicated potential limitations of RHA-WMA mixtures under high-traffic conditions. It is envisioned that this study would help advance the circular economy principles in pavement applications by fostering the utilization of agricultural wastes and their derivatives.