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This study investigates a lignin-based bio-binder incorporating two waste cooking oils (HAU Process oil and beef fat) for mix design. Two Lignin–waste oil modified bitumens (LWCo-MB) were optimized using penetration and softening point tests and compared with a conventional 35/50 bitumen in mixture design. Mechanical performance was assessed through indirect tensile strength, water sensitivity, and stiffness modulus tests. Results indicate that the incorporation of bio-binders reduced dry indirect tensile strength by approximately 8.5% compared to the reference mixture. After water conditioning, tensile strength decreased by 11% for the reference mixture and by about 19% for bio-binder mixtures. Complex modulus results show a slight increase of stiffening.

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Formulation and Characterization of Lignin and Waste Cooking Oil Modified Bituminous Mixtures

  • 会议论文

  • 发表日期：

    2026年

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  • C. Somé,
  • F. Belayali,
  • L. Khouchaf,
  • V. Mouillet,
  • M. Millares

摘要

This study investigates a lignin-based bio-binder incorporating two waste cooking oils (HAU Process oil and beef fat) for mix design. Two Lignin–waste oil modified bitumens (LWCo-MB) were optimized using penetration and softening point tests and compared with a conventional 35/50 bitumen in mixture design. Mechanical performance was assessed through indirect tensile strength, water sensitivity, and stiffness modulus tests. Results indicate that the incorporation of bio-binders reduced dry indirect tensile strength by approximately 8.5% compared to the reference mixture. After water conditioning, tensile strength decreased by 11% for the reference mixture and by about 19% for bio-binder mixtures. Complex modulus results show a slight increase of stiffening.