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This study evaluated the thickness, percentage reduction of thickness, cost analysis, and percentage cost reduction of different layers of flexible pavement and overall pavements, taking fly ash as an additive and liquid alkaline as an activator for subgrade soil strengthening. The investigation opportunity of the study involves moderation of soil by incorporating various percentages of fly ash and a liquid alkaline activator (Na2SiO3.9H2O (1 M): NaOH (10 M)) in 70:30 ratio as the optimum liquid alkaline activator content (OLC), assessment of upgradation in soil characteristics, pavement design underneath 30MSA and 50MSA design traffic, and cost evaluation. In this procedure total five soil samples were considered. The research showed that fly ash and OLC used in natural soil for subgrade offered less thickness and lower construction costs than the natural soil subgrade pavement sections under both traffic conditions. The concept obtained in this study could give paramount intuition to engineers, proponents, policymakers, road authorities, and other collaborators in evaluating different pavement options that clinch transportation infrastructure’s profit-making and sustainable development.

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Expansive Soil Amended Using Fly Ash and Liquid Alkaline Activator for Flexible Pavement Design

  • 会议论文

  • 发表日期：

    2025年

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  • Jagdish Patidar,
  • Roop Kishor

摘要

This study evaluated the thickness, percentage reduction of thickness, cost analysis, and percentage cost reduction of different layers of flexible pavement and overall pavements, taking fly ash as an additive and liquid alkaline as an activator for subgrade soil strengthening. The investigation opportunity of the study involves moderation of soil by incorporating various percentages of fly ash and a liquid alkaline activator (Na2SiO3.9H2O (1 M): NaOH (10 M)) in 70:30 ratio as the optimum liquid alkaline activator content (OLC), assessment of upgradation in soil characteristics, pavement design underneath 30MSA and 50MSA design traffic, and cost evaluation. In this procedure total five soil samples were considered. The research showed that fly ash and OLC used in natural soil for subgrade offered less thickness and lower construction costs than the natural soil subgrade pavement sections under both traffic conditions. The concept obtained in this study could give paramount intuition to engineers, proponents, policymakers, road authorities, and other collaborators in evaluating different pavement options that clinch transportation infrastructure’s profit-making and sustainable development.