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ENHANCING CRACK RESISTANCE IN FLEXIBLE PAVEMENT BY INCORPORATING LIGNIN AND RECYCLED CONCRETE AGGREGATE INTO BITUMEN MIXES

  • Unique Paper ID: 172566
  • Volume: 11
  • Issue: 9
  • PageNo: 207-213
  • Abstract:
  • Abstract—This research explores the incorporation of lignin into bitumen mixes as a sustainable approach to enhance crack resistance in flexible pavements. Lignin, a complex organic polymer derived from lignocellulosic biomass, is abundant and offers unique properties that can significantly enhance the performance of asphalt. By enhancing the mechanical characteristics of bitumen, lignin can increase ductility and elasticity, thus reducing brittleness and improving the material's ability to withstand deformation under load. This is particularly crucial for minimizing the risk of cracking, a common failure mode in flexible pavements. Furthermore, lignin improves the temperature susceptibility of asphalt binders, helping to maintain their performance under varying thermal conditions. This enhancement means that pavements are less likely to experience cracking in colder temperatures and are better equipped to handle deformation in hotter climates. The use of lignin not only contributes to improved mechanical properties but also aligns with global sustainability goals by reducing reliance on petroleum-based products. Its antioxidant properties enhance aging resistance, helping to maintain the integrity and performance of asphalt over time and reducing maintenance costs associated with pavement deterioration. However, the successful incorporation of lignin poses challenges, such as achieving uniform dispersion in bitumen and determining the optimal dosage to maximize benefits while maintaining workability. The study investigates the effects of lignin and recycled concrete aggregate (RCA) on bitumen and its mixtures. Lignin addition reduced penetration and ductility values while increasing softening point, specific gravity, and fire/flash points, enhancing stiffness and resistance to deformation. The inclusion of RCA slightly reduced aggregate strength, indicated by higher crushing, impact, and abrasion values. Lignin improved Marshall Stability, fracture energy, and flexibility index, with maximum stability of 11.05 kN and fracture energy of 1126.03 J/m². However, tensile strength ratio (TSR) decreased, highlighting moisture susceptibility. The combined use of lignin and RCA shows promise for sustainable, crack-resistant pavement applications.
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Cite This Article

  • ISSN: 2349-6002
  • Volume: 11
  • Issue: 9
  • PageNo: 207-213

ENHANCING CRACK RESISTANCE IN FLEXIBLE PAVEMENT BY INCORPORATING LIGNIN AND RECYCLED CONCRETE AGGREGATE INTO BITUMEN MIXES

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Impact Factor
8.01 (Year 2024)
UGC Approved
Journal no 47859

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