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<p>Expansive black cotton soils pose significant challenges for road construction due to their high plasticity and pronounced volume changes in response to moisture fluctuations. This study evaluates the effectiveness of fly ash stabilization combined with moisture variation control as a sustainable solution for such problematic subgrades. Laboratory experiments were conducted using 15–20% fly ash admixtures, compacted at Optimum Moisture Content (OMC) + 2%, followed by field implementation on a trial stretch at Jakhargaon Bypass, Maharashtra. Results revealed a substantial improvement in soil performance, with UCS increasing by nearly 90%, swelling pressure reduced by over 80%, and the natural moisture content beneath the stabilized section remaining roughly constant (12–14%) across seasons. Field validation confirmed minimal surface distress and long-term stability. The study demonstrates that moisture control through fly ash stabilization provides a cost-effective, durable, and environmentally sustainable approach for road construction over expansive soils.</p>

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Field and Laboratory Evaluation of Fly Ash–Stabilized Moisture Control Technique for Roads Over Expansive Black Cotton Soils: A Case Study

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Jagdish Gouda,
  • Mainak Majumder,
  • Srinivasan Venkatraman

摘要

Expansive black cotton soils pose significant challenges for road construction due to their high plasticity and pronounced volume changes in response to moisture fluctuations. This study evaluates the effectiveness of fly ash stabilization combined with moisture variation control as a sustainable solution for such problematic subgrades. Laboratory experiments were conducted using 15–20% fly ash admixtures, compacted at Optimum Moisture Content (OMC) + 2%, followed by field implementation on a trial stretch at Jakhargaon Bypass, Maharashtra. Results revealed a substantial improvement in soil performance, with UCS increasing by nearly 90%, swelling pressure reduced by over 80%, and the natural moisture content beneath the stabilized section remaining roughly constant (12–14%) across seasons. Field validation confirmed minimal surface distress and long-term stability. The study demonstrates that moisture control through fly ash stabilization provides a cost-effective, durable, and environmentally sustainable approach for road construction over expansive soils.