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<p>Incorporating chemical binders such as ordinary Portland cement (OPC), lime, and fly ash (FA) significantly improves the strength and reduces the swelling potential of expansive soils. Although previous studies have mainly focused on unconfined compressive strength (UCS) and swell behaviour, the effects of these binders on shear strength remain comparatively underexplored. Additionally, limited research has examined the geotechnical properties of chemically stabilized soils with different degrees of expansivity. This study, therefore, investigates the shear strength and swell characteristics of moderately and highly expansive soils treated with OPC, lime, and FA. Each soil type was stabilized using the optimum binder dosage, and tests including direct shear, UCS, free swell, and swell pressure were performed. The findings revealed that OPC-treated soils achieved the highest shear strength, followed by FA and lime. OPC also produced the greatest cohesion and friction angle among the chemical binders. UCS increased by 1149%–1662%, 601%–817%, and 1407%–2081% for soils treated with OPC, lime, and FA, respectively. Subsequently, swell pressure reductions ranged between 36%–45%, 22%–29%, and 50%–57% for OPC, lime, and FA, respectively. Overall, OPC most effectively enhanced shear strength, while FA provided superior improvements in UCS and swell reduction.</p>

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Shear strength and swell characteristics of moderate and highly expansive soils stabilized with ordinary Portland cement, lime, and fly ash

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • M. N. Nifal,
  • M. C. M. Nasvi,
  • L. C. Kurukulasuriya

摘要

Incorporating chemical binders such as ordinary Portland cement (OPC), lime, and fly ash (FA) significantly improves the strength and reduces the swelling potential of expansive soils. Although previous studies have mainly focused on unconfined compressive strength (UCS) and swell behaviour, the effects of these binders on shear strength remain comparatively underexplored. Additionally, limited research has examined the geotechnical properties of chemically stabilized soils with different degrees of expansivity. This study, therefore, investigates the shear strength and swell characteristics of moderately and highly expansive soils treated with OPC, lime, and FA. Each soil type was stabilized using the optimum binder dosage, and tests including direct shear, UCS, free swell, and swell pressure were performed. The findings revealed that OPC-treated soils achieved the highest shear strength, followed by FA and lime. OPC also produced the greatest cohesion and friction angle among the chemical binders. UCS increased by 1149%–1662%, 601%–817%, and 1407%–2081% for soils treated with OPC, lime, and FA, respectively. Subsequently, swell pressure reductions ranged between 36%–45%, 22%–29%, and 50%–57% for OPC, lime, and FA, respectively. Overall, OPC most effectively enhanced shear strength, while FA provided superior improvements in UCS and swell reduction.