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<p>The disposal of waste sludge generated during water treatment processes is an ever-growing environmental and financial challenge. Conventional landfilling methods pose significant drawbacks, including operational costs and limited capacity. To address this issue, this comprehensive geotechnical study investigates an eco-friendly alternative: reusing Drinking Water Treatment Sludge (DWTS) in soil stabilization for pavement construction. The research explores the effects of different DWTS percentages (10%, 20%, 25%, and 30%), lime concentrations (2%, 4%, and 6%), and various DWTS-lime combinations on the stabilization of expansive soil. The findings reveal substantial reductions in soil plasticity, optimum moisture content, linear shrinkage, and free swell with the addition of DWTS, along with enhanced maximum dry density, Unconfined Compressive Strength (UCS), California Bearing Ratio (CBR), and Resilient Modulus values. The performance of pavement sections constructed with DWTS as a soil stabilizer was compared to those designed with natural, untreated soils using the Mechanistic Empirical Pavement Design Guide (MEPDG). These results underscore the effectiveness of DWTS as a soil stabilizer, offering valuable insights for sustainable DWTS management and its application in road construction. This study advances eco-friendly waste disposal solutions and encourages further research in this vital field.</p>

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Enhancing sustainability in pavement construction: investigating the impact of water treatment sludge on lime-stabilized soil properties

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Samer R. Rabab’ah,
  • Omar H. Al Hattamleh,
  • Madhar M. Taamneh,
  • Sojoud F. Al-Manaseer,
  • Mohammad O. Taamneh,
  • Yousof M. Alshorman

摘要

The disposal of waste sludge generated during water treatment processes is an ever-growing environmental and financial challenge. Conventional landfilling methods pose significant drawbacks, including operational costs and limited capacity. To address this issue, this comprehensive geotechnical study investigates an eco-friendly alternative: reusing Drinking Water Treatment Sludge (DWTS) in soil stabilization for pavement construction. The research explores the effects of different DWTS percentages (10%, 20%, 25%, and 30%), lime concentrations (2%, 4%, and 6%), and various DWTS-lime combinations on the stabilization of expansive soil. The findings reveal substantial reductions in soil plasticity, optimum moisture content, linear shrinkage, and free swell with the addition of DWTS, along with enhanced maximum dry density, Unconfined Compressive Strength (UCS), California Bearing Ratio (CBR), and Resilient Modulus values. The performance of pavement sections constructed with DWTS as a soil stabilizer was compared to those designed with natural, untreated soils using the Mechanistic Empirical Pavement Design Guide (MEPDG). These results underscore the effectiveness of DWTS as a soil stabilizer, offering valuable insights for sustainable DWTS management and its application in road construction. This study advances eco-friendly waste disposal solutions and encourages further research in this vital field.