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<p>Dispersive soils, due to their high erodibility and cation exchange sensitivity, pose significant challenges in geotechnical applications. This study investigates the engineering behavior of such soils under a wide range of thermal regimes (25–900&#xa0;°C), focusing on their mechanical, hydraulic, and physicochemical properties. Unlike previous studies that emphasized microstructure alone, this research integrates a broad range of analytical methodsmineralogical (XRD, SEM), chemical (CEC, SSA, carbonate content), and geotechnical (Atterberg limits, unconfined compressive strength, permeability, TGA) to capture a comprehensive understanding of thermal stabilization effects.</p><p>Results reveal that thermal treatment significantly enhances soil performance: at 300&#xa0;°C, dispersion decreased by 65% due to complete free water removal; at 500&#xa0;°C, dehydroxylation induced structural rearrangement and mineral breakdown, improving both strength and permeability. At 700&#xa0;°C and beyond, the formation of cementitious phases such as gehlenite and anorthite transforms the soil into a dense, non-dispersive medium, increasing UCS by 36.5 times and permeability by 12,000 times. These findings emphasize the effectiveness of high-temperature treatment as a sustainable and technically sound approach for stabilizing dispersive soils in geotechnical and environmental applications, including landfill liners, geothermal barriers, and contaminant containment zones.</p>

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Engineering stability through heat: understanding thermal regime effects on dispersive soils

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • S. A. Heidari,
  • M. Amiri,
  • A. Harifi,
  • W. Wu

摘要

Dispersive soils, due to their high erodibility and cation exchange sensitivity, pose significant challenges in geotechnical applications. This study investigates the engineering behavior of such soils under a wide range of thermal regimes (25–900 °C), focusing on their mechanical, hydraulic, and physicochemical properties. Unlike previous studies that emphasized microstructure alone, this research integrates a broad range of analytical methodsmineralogical (XRD, SEM), chemical (CEC, SSA, carbonate content), and geotechnical (Atterberg limits, unconfined compressive strength, permeability, TGA) to capture a comprehensive understanding of thermal stabilization effects.

Results reveal that thermal treatment significantly enhances soil performance: at 300 °C, dispersion decreased by 65% due to complete free water removal; at 500 °C, dehydroxylation induced structural rearrangement and mineral breakdown, improving both strength and permeability. At 700 °C and beyond, the formation of cementitious phases such as gehlenite and anorthite transforms the soil into a dense, non-dispersive medium, increasing UCS by 36.5 times and permeability by 12,000 times. These findings emphasize the effectiveness of high-temperature treatment as a sustainable and technically sound approach for stabilizing dispersive soils in geotechnical and environmental applications, including landfill liners, geothermal barriers, and contaminant containment zones.