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<p>As the construction industry moves towards sustainable alternatives to ordinary Portland cement (OPC), coal bottom ash (CBA) has gained attention as a promising binder due to its abundance, environmental benefits, and potential to reduce the carbon footprint of concrete production. This review comprehensively examines the performance of CBA as a binder in geopolymer concrete (GPC), emphasizing its mechanical properties, microstructure, and durability. Key findings highlight the influence of CBA on compressive strength, workability, and other mechanical characteristics in GPC formulations. Microstructural analysis reveals the role of CBA in forming geopolymeric gels and its effect on structural integrity. The durability of CBA-based GPC is also explored, focusing on resistance to chemical attack, thermal stability, and long-term performance. While challenges such as variability in CBA quality persist, the review underscores the potential of CBA to enhance the sustainability and functionality of GPC.</p>

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Sustainable Applications of Coal Bottom Ash as a Binder in Geopolymer Concrete: A Comprehensive Review

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Mohammed Ali M. Rihan,
  • Chukwuemeka Daniel,
  • Dipankar Das,
  • Tajebe Bezabih,
  • Tareg Abdalla Abdalla

摘要

As the construction industry moves towards sustainable alternatives to ordinary Portland cement (OPC), coal bottom ash (CBA) has gained attention as a promising binder due to its abundance, environmental benefits, and potential to reduce the carbon footprint of concrete production. This review comprehensively examines the performance of CBA as a binder in geopolymer concrete (GPC), emphasizing its mechanical properties, microstructure, and durability. Key findings highlight the influence of CBA on compressive strength, workability, and other mechanical characteristics in GPC formulations. Microstructural analysis reveals the role of CBA in forming geopolymeric gels and its effect on structural integrity. The durability of CBA-based GPC is also explored, focusing on resistance to chemical attack, thermal stability, and long-term performance. While challenges such as variability in CBA quality persist, the review underscores the potential of CBA to enhance the sustainability and functionality of GPC.