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<p>The accumulation of mining waste, including fly ash (FA), poses significant health and environmental challenges, while the cement industry remains a major source of CO<sub>2</sub> emissions. This study investigates the potential of using FA as a supplementary cementitious material (SCM) in mortar. We assessed the effects of FA on thermal conductivity, diffusivity, mechanical strength, and the associated environmental and economic impacts. Results showed that replacing up to 50% of the cement with FA reduced thermal conductivity and diffusivity by approximately 20%, indicating its role in insulating applications. Substitutions up to 30% maintained adequate mechanical strength for structural masonry, whereas higher replacements remained suitable for non-structural applications. The incorporation of FA also yielded substantial environmental and economic advantages, reducing CO<sub>2</sub> emissions by up to 52% and material costs by roughly 35% per cubic meter of mortar compared to the conventional reference. This study underscores the promising potential of North African FA in sustainable construction, offering a pathway to significant environmental and economic benefits while contributing to effective industrial waste management.</p>

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From coal waste to construction resource: evaluating the physical and thermomechanical performance of masonry mortar incorporating fly ash

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Mohammed Drissi,
  • Othmane Horma,
  • Ahmed Mezrhab

摘要

The accumulation of mining waste, including fly ash (FA), poses significant health and environmental challenges, while the cement industry remains a major source of CO2 emissions. This study investigates the potential of using FA as a supplementary cementitious material (SCM) in mortar. We assessed the effects of FA on thermal conductivity, diffusivity, mechanical strength, and the associated environmental and economic impacts. Results showed that replacing up to 50% of the cement with FA reduced thermal conductivity and diffusivity by approximately 20%, indicating its role in insulating applications. Substitutions up to 30% maintained adequate mechanical strength for structural masonry, whereas higher replacements remained suitable for non-structural applications. The incorporation of FA also yielded substantial environmental and economic advantages, reducing CO2 emissions by up to 52% and material costs by roughly 35% per cubic meter of mortar compared to the conventional reference. This study underscores the promising potential of North African FA in sustainable construction, offering a pathway to significant environmental and economic benefits while contributing to effective industrial waste management.