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<p>This study evaluates the sustainable potential of hot mix asphalt (HMA) incorporating recycled aggregate and molasses modified bitumen (MMB). Due to rising material costs, environmental concerns, and construction waste generation, alternative materials for asphalt production are essential. Molasses, a sugarcane byproduct, modifies the binder properties, while Reclaimed asphalt pavement (RAP) reduces the demand for virgin aggregates. The research objectives were to assess the physical and mechanical properties of HMA mixes with varying recycled aggregate and molasses contents and compare them to a control mix. A control mix was first designed using virgin aggregates and VG-30 bitumen, achieving an optimum binder content of 4.97% through Marshall mix design (ASTM D6926/D6927). Experimental variables systematically evaluated (i) RAP content (0%, 10%, 25%, and 50% replacement of virgin coarse aggregate) and (ii) molasses dosage (0%, 10%, 13%, and 15% by bitumen weight). Laboratory testing included aggregate characterization (Los Angeles abrasion, impact value), Marshall stability-flow analysis, and volumetric measurements (air voids, Voids in Mineral Aggregate (VMA), Voids Filled with Bitumen (VFB) following SSRBW 2073 specifications. Results revealed that the 25% RAP + 13% MMB mix delivered optimal performance, meeting all standards: Marshall Stability (12.79 kN), air voids (3.59%), VMA (15.31%), and VFB (76.57%). Higher RAP (50%) or molasses (15%) contents led to failures—excessive air voids (&gt; 5%) at 50% RAP and overfilled voids (VFB &gt; 75%) at 15% molasses—due to aged binder stiffness and moisture evaporation, respectively. The study demonstrates that 25% RAP with 13% molasses optimally balances mechanical performance and sustainability, reducing virgin material demand by 25% while utilizing sugarcane byproducts. The study concludes that incorporating recycled aggregates and molasses in asphalt is feasible for sustainable construction, promoting resource conservation and waste reduction. The findings highlight the potential for sustainable pavement solutions through bio-based binders and recycled materials.</p>

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Study of Properties of Hot Mix Asphalt by Using Recycled Aggregate and Molasses

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Rabindra Paudel,
  • Avishek Adhikari,
  • Bhabuk Nepal

摘要

This study evaluates the sustainable potential of hot mix asphalt (HMA) incorporating recycled aggregate and molasses modified bitumen (MMB). Due to rising material costs, environmental concerns, and construction waste generation, alternative materials for asphalt production are essential. Molasses, a sugarcane byproduct, modifies the binder properties, while Reclaimed asphalt pavement (RAP) reduces the demand for virgin aggregates. The research objectives were to assess the physical and mechanical properties of HMA mixes with varying recycled aggregate and molasses contents and compare them to a control mix. A control mix was first designed using virgin aggregates and VG-30 bitumen, achieving an optimum binder content of 4.97% through Marshall mix design (ASTM D6926/D6927). Experimental variables systematically evaluated (i) RAP content (0%, 10%, 25%, and 50% replacement of virgin coarse aggregate) and (ii) molasses dosage (0%, 10%, 13%, and 15% by bitumen weight). Laboratory testing included aggregate characterization (Los Angeles abrasion, impact value), Marshall stability-flow analysis, and volumetric measurements (air voids, Voids in Mineral Aggregate (VMA), Voids Filled with Bitumen (VFB) following SSRBW 2073 specifications. Results revealed that the 25% RAP + 13% MMB mix delivered optimal performance, meeting all standards: Marshall Stability (12.79 kN), air voids (3.59%), VMA (15.31%), and VFB (76.57%). Higher RAP (50%) or molasses (15%) contents led to failures—excessive air voids (> 5%) at 50% RAP and overfilled voids (VFB > 75%) at 15% molasses—due to aged binder stiffness and moisture evaporation, respectively. The study demonstrates that 25% RAP with 13% molasses optimally balances mechanical performance and sustainability, reducing virgin material demand by 25% while utilizing sugarcane byproducts. The study concludes that incorporating recycled aggregates and molasses in asphalt is feasible for sustainable construction, promoting resource conservation and waste reduction. The findings highlight the potential for sustainable pavement solutions through bio-based binders and recycled materials.