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<p>Expansive clayey soils pose significant challenges in pavement construction due to their high shrink–swell potential and low strength characteristics. This study explores an eco-friendly approach to soil stabilization by incorporating construction and demolition waste (CDW), pine needle ash (PNA), and polypropylene fiber (PF). The objective is to enhance the geotechnical properties of clayey soil and assess its suitability as a subgrade material for flexible pavements. A comprehensive experimental program, including Atterberg limits, compaction, unconfined compressive strength (UCS), California bearing ratio (CBR), and permeability tests, was conducted to evaluate the effects of these additives. The resilient modulus was estimated from CBR test results, and the optimized mix was further analyzed for pavement thickness design and cost-effectiveness. The findings revealed that increasing CDW and PNA content, along with an optimum PF dosage, significantly improved MDD, UCS, CBR, and permeability. The optimum mix proportion of C:CDW:PNA:PF = 100:15:5:0.4 demonstrated the best performance, making it a viable solution for sustainable pavement construction. The study underscores the potential of utilizing waste materials to enhance subgrade strength while reducing dependency on natural resources, aligning with sustainable development goals.</p>

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Designing flexible pavement for low volume roads incorporating waste materials and polypropylene fiber: An approach towards waste reduction and reuse

  • 期刊论文

  • 发表日期：

    2025年9月20日

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  • Abhishek Sharma,
  • Kanwarpreet Singh,
  • Abdullah H Alsabhan,
  • Shamshad Alam,
  • Jibran Qadri

摘要

Expansive clayey soils pose significant challenges in pavement construction due to their high shrink–swell potential and low strength characteristics. This study explores an eco-friendly approach to soil stabilization by incorporating construction and demolition waste (CDW), pine needle ash (PNA), and polypropylene fiber (PF). The objective is to enhance the geotechnical properties of clayey soil and assess its suitability as a subgrade material for flexible pavements. A comprehensive experimental program, including Atterberg limits, compaction, unconfined compressive strength (UCS), California bearing ratio (CBR), and permeability tests, was conducted to evaluate the effects of these additives. The resilient modulus was estimated from CBR test results, and the optimized mix was further analyzed for pavement thickness design and cost-effectiveness. The findings revealed that increasing CDW and PNA content, along with an optimum PF dosage, significantly improved MDD, UCS, CBR, and permeability. The optimum mix proportion of C:CDW:PNA:PF = 100:15:5:0.4 demonstrated the best performance, making it a viable solution for sustainable pavement construction. The study underscores the potential of utilizing waste materials to enhance subgrade strength while reducing dependency on natural resources, aligning with sustainable development goals.