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<p>The environmentally conscious and viable alternative to the traditional binders like lime and cement includes the sustainable use of industrial by-products for soil stabilization. This study proposes an innovative solution beyond the sole use of fly ash for geotechnical applications such as Class F fly ash (15–30%), and polypropylene fibres (0.5–2%) in high-plasticity red soil. The laboratory testing including compaction, unconfined compressive strength, stiffness, and strength ratio allows us to discern the changes in density, strength, and ductility. The findings from the study showed that the addition of fly ash to the mixtures increased the strength and stiffness significantly, with the best result obtained using 20% fly ash. The reasons for such an increase in properties are due to the filler effect causing the soil to become denser. Polypropylene fibres improved ductility, crack resistance, and post-peak performance but diminished the efficiency of compaction and stiffness at high dosages (&gt; 1.5%). The optimum mix was 20–25% fly ash with 1% polypropylene fibre, which showed significant combined improvement in strength, ductility, and workability. These outcomes lead one to believe that the logical use of fly ash and artificial fibers in soil stabilization can indeed be accomplished to improve soils of poor quality, especially employed in road subgrades and other infrastructure projects.</p>

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Geotechnical Performance of Red Soil Stabilized with Fly Ash and Reinforced with Polypropylene Fibres

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Nekibuddin Ahmed,
  • Abhijit Deka

摘要

The environmentally conscious and viable alternative to the traditional binders like lime and cement includes the sustainable use of industrial by-products for soil stabilization. This study proposes an innovative solution beyond the sole use of fly ash for geotechnical applications such as Class F fly ash (15–30%), and polypropylene fibres (0.5–2%) in high-plasticity red soil. The laboratory testing including compaction, unconfined compressive strength, stiffness, and strength ratio allows us to discern the changes in density, strength, and ductility. The findings from the study showed that the addition of fly ash to the mixtures increased the strength and stiffness significantly, with the best result obtained using 20% fly ash. The reasons for such an increase in properties are due to the filler effect causing the soil to become denser. Polypropylene fibres improved ductility, crack resistance, and post-peak performance but diminished the efficiency of compaction and stiffness at high dosages (> 1.5%). The optimum mix was 20–25% fly ash with 1% polypropylene fibre, which showed significant combined improvement in strength, ductility, and workability. These outcomes lead one to believe that the logical use of fly ash and artificial fibers in soil stabilization can indeed be accomplished to improve soils of poor quality, especially employed in road subgrades and other infrastructure projects.