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An effective method for enhancing the necessary characteristics of weak soil for pavement building is soil stabilization. When moist, black cotton (BC) soil exhibits volume-changing properties and instability. In this investigation, Class F fly ash (0–45%) (FA) and a constant 5% limestone powder (LSP) are blended into BC soil and stabilized using an alkaline solution. Mixing 8 molar NaOH solution (SH) with sodium silicate solution (SS) at 0.5, 1, and 1.5 SS/SH ratios yielded the alkaline solution. Higher admixture doses and SS/SH ratios significantly increased the sample’s unconfined compressive strength. The treated soil exhibits a noteworthy enhancement in flexural strength, unsoaked California Bearing Ratio (CBR) value, and fatigue life. The SEM (scanning electron microscope) images and X-Ray Diffraction (XRD) micrographs justify this improvement in strength. However, the samples failed the durability test entirely because of softening when they came into contact with water. Because of softening, even the soaked CBR values are quite low. As a result, this treatment approach is inappropriate for enhancing BC soil.

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Improvement of BC Soil Blended with Class F Fly Ash and Limestone Powder Using an Alkali Solution for Pavement Application

  • 会议论文

  • 发表日期：

    2026年

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  • B. A. Chethan,
  • A. U. Ravi Shankar,
  • A. Manoj,
  • R. Amar,
  • H. N. Harsha,
  • R. Devanad,
  • Guruprasad M. Hugar,
  • Mithesh Kumar

摘要

An effective method for enhancing the necessary characteristics of weak soil for pavement building is soil stabilization. When moist, black cotton (BC) soil exhibits volume-changing properties and instability. In this investigation, Class F fly ash (0–45%) (FA) and a constant 5% limestone powder (LSP) are blended into BC soil and stabilized using an alkaline solution. Mixing 8 molar NaOH solution (SH) with sodium silicate solution (SS) at 0.5, 1, and 1.5 SS/SH ratios yielded the alkaline solution. Higher admixture doses and SS/SH ratios significantly increased the sample’s unconfined compressive strength. The treated soil exhibits a noteworthy enhancement in flexural strength, unsoaked California Bearing Ratio (CBR) value, and fatigue life. The SEM (scanning electron microscope) images and X-Ray Diffraction (XRD) micrographs justify this improvement in strength. However, the samples failed the durability test entirely because of softening when they came into contact with water. Because of softening, even the soaked CBR values are quite low. As a result, this treatment approach is inappropriate for enhancing BC soil.