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This study investigates the potential of utilizing rice husk ash (RHA) as a sustainable soil stabilizer in regions with weak and expansive soils. RHA, a plentiful byproduct of rice milling, contains high levels of amorphous silica, making it a promising ground improvement material. By integrating RHA into subgrade layers, numerous benefits are realized, including environmental preservation, cost reduction, and decreased reliance on traditional stabilizers like cement and lime. Through experimental analysis, sixteen specimen combinations of soil–RHA–cement were studied to assess their impact on geotechnical properties. Various admixtures were prepared, incorporating different percentages of RHA (2, 4, and 6%) and cement (2, 4, and 6%) within the upper, bottom, and double subgrade layers. Mechanical testing and SEM and EDS analyses provided insights into stabilized soils’ microstructural and elemental composition. Results indicated significant improvement in shear strength across all subgrade layers, highlighting the effectiveness of this innovative approach.

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Optimizing Soil Strength Through Rice Husk Ash Incorporation: A Sustainable Geotechnical Solution

  • 会议论文

  • 发表日期：

    2025年

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  • Abdelmageed Atef,
  • Zakaria Hossain

摘要

This study investigates the potential of utilizing rice husk ash (RHA) as a sustainable soil stabilizer in regions with weak and expansive soils. RHA, a plentiful byproduct of rice milling, contains high levels of amorphous silica, making it a promising ground improvement material. By integrating RHA into subgrade layers, numerous benefits are realized, including environmental preservation, cost reduction, and decreased reliance on traditional stabilizers like cement and lime. Through experimental analysis, sixteen specimen combinations of soil–RHA–cement were studied to assess their impact on geotechnical properties. Various admixtures were prepared, incorporating different percentages of RHA (2, 4, and 6%) and cement (2, 4, and 6%) within the upper, bottom, and double subgrade layers. Mechanical testing and SEM and EDS analyses provided insights into stabilized soils’ microstructural and elemental composition. Results indicated significant improvement in shear strength across all subgrade layers, highlighting the effectiveness of this innovative approach.