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<p>India’s paper industry generates 3.3 million tonnes of pulp annually, yielding lignin as an underutilized byproduct. This study evaluates sodium lignosulphonate (SLS), derived from lignin, as a sustainable additive for VG-30 bitumen to mitigate petroleum dependency. SLS-modified bitumen blends (8–24% concentrations) were analyzed for chemical compatibility, aging resistance, and mechanical performance. Rolling Thin Film Oven Test simulated short-term aging, while Fourier Transform Infrared spectroscopy and X-ray diffraction revealed enhanced oxidation resistance and structural stability in SLS-modified binders. Field emission scanning electron microscopy confirmed uniform SLS dispersion in bitumen. Dynamic Shear Rheometer -based Multiple Stress Creep and Recovery tests demonstrated improved elastic recovery (32% at 20% SLS vs. 18% for base bitumen) and reduced permanent deformation. Optimal 20% SLS addition increased viscosity by 41%, delayed aging, and extended binder durability, enabling a 20% reduction in conventional bitumen usage. Energy-dispersive X-ray analysis validated SLS’s inorganic-rich composition, aligning with its role as an eco-friendly extender. This work positions SLS as a viable, scalable solution for sustainable road construction, leveraging industrial waste to enhance pavement performance while reducing carbon footprints.</p>

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Suitability analysis of sodium lignosulphonate a bio polymer as bitumen modifier for low volume roads in India

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Alok Kumar,
  • C. Makendran

摘要

India’s paper industry generates 3.3 million tonnes of pulp annually, yielding lignin as an underutilized byproduct. This study evaluates sodium lignosulphonate (SLS), derived from lignin, as a sustainable additive for VG-30 bitumen to mitigate petroleum dependency. SLS-modified bitumen blends (8–24% concentrations) were analyzed for chemical compatibility, aging resistance, and mechanical performance. Rolling Thin Film Oven Test simulated short-term aging, while Fourier Transform Infrared spectroscopy and X-ray diffraction revealed enhanced oxidation resistance and structural stability in SLS-modified binders. Field emission scanning electron microscopy confirmed uniform SLS dispersion in bitumen. Dynamic Shear Rheometer -based Multiple Stress Creep and Recovery tests demonstrated improved elastic recovery (32% at 20% SLS vs. 18% for base bitumen) and reduced permanent deformation. Optimal 20% SLS addition increased viscosity by 41%, delayed aging, and extended binder durability, enabling a 20% reduction in conventional bitumen usage. Energy-dispersive X-ray analysis validated SLS’s inorganic-rich composition, aligning with its role as an eco-friendly extender. This work positions SLS as a viable, scalable solution for sustainable road construction, leveraging industrial waste to enhance pavement performance while reducing carbon footprints.