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<p>Municipal solid waste incinerated bottom ash (MSW IBA), a residue from waste-to-energy processes, is frequently disposed of untreated in landfills, raising environmental concerns due to the leaching of heavy metals. This study explores the potential for reusing MSW IBA in pavement applications through stabilization using cement and ALCCOFINE at varying dosages (6%, 7%, and 8%) and curing durations (7, 14, and 28&#xa0;days). Geotechnical investigations, including Unconfined Compressive Strength (UCS), durability, and California Bearing Ratio tests, were conducted to assess performance. The highest UCS values were observed in IBA treated with 8% cement and 8% ALCCOFINE after 28&#xa0;days of curing, achieving 2572&#xa0;kPa and 3859&#xa0;kPa, respectively. These mixes also met the Indian Roads Congress durability criterion of maintaining over 80% residual strength. Microstructural analyses (SEM, XRD, FTIR) confirmed the development of strength-contributing phases such as ettringite and calcium silicate hydrate (C–S–H). The novelty of the study lies in evaluating the performance of an industrial by-product over conventional stabilizer for treating IBA. The findings support the use of untreated IBA in embankment fills, treated IBA in subgrades and ALCCOFINE-treated IBA in sub-base of pavements.</p>

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Optimization of Cement- and ALCCOFINE-Treated Municipal Solid Waste Incinerated Bottom Ash in Pavement Applications

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Sreeshma Govindan,
  • Anil Kumar

摘要

Municipal solid waste incinerated bottom ash (MSW IBA), a residue from waste-to-energy processes, is frequently disposed of untreated in landfills, raising environmental concerns due to the leaching of heavy metals. This study explores the potential for reusing MSW IBA in pavement applications through stabilization using cement and ALCCOFINE at varying dosages (6%, 7%, and 8%) and curing durations (7, 14, and 28 days). Geotechnical investigations, including Unconfined Compressive Strength (UCS), durability, and California Bearing Ratio tests, were conducted to assess performance. The highest UCS values were observed in IBA treated with 8% cement and 8% ALCCOFINE after 28 days of curing, achieving 2572 kPa and 3859 kPa, respectively. These mixes also met the Indian Roads Congress durability criterion of maintaining over 80% residual strength. Microstructural analyses (SEM, XRD, FTIR) confirmed the development of strength-contributing phases such as ettringite and calcium silicate hydrate (C–S–H). The novelty of the study lies in evaluating the performance of an industrial by-product over conventional stabilizer for treating IBA. The findings support the use of untreated IBA in embankment fills, treated IBA in subgrades and ALCCOFINE-treated IBA in sub-base of pavements.