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<p>Addressing the persistent challenges of pavement distress from increased traffic loads and insufficient maintenance, this study explores a dual-modifier asphalt system that combines crumb rubber derived from end-of-life tires with bio-modifiers extracted from Delonix Regia seeds. The selected modifiers provide complementary benefits: crumb rubber enhances elasticity and fatigue resistance while also contributing to sustainable tire waste management, while Delonix seed extract improves binder adhesion and structural integrity due to its porous and fibrous morphology. The investigation focuses on optimizing crumb rubber particle sizes and analysing the combined action of both modifiers on mixture performance. Key mechanical indicators such as Marshall stability, indirect tensile strength, resilient modulus, and fatigue life were evaluated. Results show that a 10% addition of 0.30&#xa0;mm crumb rubber and Delonix seeds significantly increased Marshall stability by 75% and extended fatigue life by 91.38% relative to control mixture. Scanning Electron Microscopy (SEM) revealed improved binder–aggregate bonding and uniform filler dispersion. These findings reinforce the practical potential of hybrid bio-waste asphalt technologies, demonstrating quantifiable improvements in strength and durability while reducing reliance on petroleum-based additives. Future research should include chemical interaction studies, large-scale performance validation, and optimization of treatment methods to further enhance applicability.</p>

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Eco-Modified asphalt binders: enhancing pavement longevity with Delonix seed extract and optimized crumb rubber granulometry

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Priyam Nath Bhowmik,
  • Pradyut Anand,
  • Kezia Saini,
  • Jayant Giri,
  • Hassen Sabeur

摘要

Addressing the persistent challenges of pavement distress from increased traffic loads and insufficient maintenance, this study explores a dual-modifier asphalt system that combines crumb rubber derived from end-of-life tires with bio-modifiers extracted from Delonix Regia seeds. The selected modifiers provide complementary benefits: crumb rubber enhances elasticity and fatigue resistance while also contributing to sustainable tire waste management, while Delonix seed extract improves binder adhesion and structural integrity due to its porous and fibrous morphology. The investigation focuses on optimizing crumb rubber particle sizes and analysing the combined action of both modifiers on mixture performance. Key mechanical indicators such as Marshall stability, indirect tensile strength, resilient modulus, and fatigue life were evaluated. Results show that a 10% addition of 0.30 mm crumb rubber and Delonix seeds significantly increased Marshall stability by 75% and extended fatigue life by 91.38% relative to control mixture. Scanning Electron Microscopy (SEM) revealed improved binder–aggregate bonding and uniform filler dispersion. These findings reinforce the practical potential of hybrid bio-waste asphalt technologies, demonstrating quantifiable improvements in strength and durability while reducing reliance on petroleum-based additives. Future research should include chemical interaction studies, large-scale performance validation, and optimization of treatment methods to further enhance applicability.