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<p>Despite the growing interest in using Municipal Solid Waste Incinerated – Bottom Ash (MSWI-BA) in road construction, understanding its performance and environmental impact is crucial. With natural aggregates becoming scarce and the need for sustainable waste management increasing, this study examined replacing fine aggregates in Bituminous Concrete (BC-II) mixes with MSWI-BA at levels from 0 to 50%. Results showed that while MSWI-BA requires more binder due to its porosity, up to 20% replacement improved Marshall Stability, stiffness, and moisture resistance. The 20% MSWI-BA mix achieved optimal performance, meeting Ministry of Road Transport and Highways (MoRTH) specifications. Though higher replacement levels (up to 30%) showed slight increases in rutting susceptibility, they still performed satisfactorily. The Toxicity Characteristic Leaching Procedure (TCLP) confirmed the MSWI-BA was non-hazardous and effectively encapsulated. Thus, up to 20% MSWI-BA replacement in BC-II mixes is recommended for a balance of performance and environmental benefits.</p>

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Pavements through waste valorization: Municipal Solid Waste Incinerated – Bottom Ash (MSWI-BA) as viable fine aggregate alternative

  • 期刊论文

  • 发表日期：

    2025年6月18日

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  • Sachin Gowda,
  • Vaishakh Kunjar,
  • Aakash Gupta,
  • Vasant G. Havanagi

摘要

Despite the growing interest in using Municipal Solid Waste Incinerated – Bottom Ash (MSWI-BA) in road construction, understanding its performance and environmental impact is crucial. With natural aggregates becoming scarce and the need for sustainable waste management increasing, this study examined replacing fine aggregates in Bituminous Concrete (BC-II) mixes with MSWI-BA at levels from 0 to 50%. Results showed that while MSWI-BA requires more binder due to its porosity, up to 20% replacement improved Marshall Stability, stiffness, and moisture resistance. The 20% MSWI-BA mix achieved optimal performance, meeting Ministry of Road Transport and Highways (MoRTH) specifications. Though higher replacement levels (up to 30%) showed slight increases in rutting susceptibility, they still performed satisfactorily. The Toxicity Characteristic Leaching Procedure (TCLP) confirmed the MSWI-BA was non-hazardous and effectively encapsulated. Thus, up to 20% MSWI-BA replacement in BC-II mixes is recommended for a balance of performance and environmental benefits.