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<p>In order to achieve the goals of decarbonization and sustainable development, this study select iron tailings, fly ash, and ceramic powder (IFC) to prepare ternary solid-waste admixtures with multiple ratios. Different Ca(OH)₂ dosages and cement substitution rates are investigated to research the activation mechanism, aiming to resolve difficulties in activating multiple solid wastes added as supplementary cementitious materials and improve the concrete pore structure. Besides, multiple water to binder ratios, admixture dosages and mixing ratios of IFC are attempted to research the effect on concrete compressive strength for 7&#xa0;days and 28&#xa0;days of curing (7D and 28D). In addition, the fineness of iron tailings (IOTs) powder is tested for both research targets above. To further study the micro morphology of IOTs particles and pore structures of the prepared concrete, scanning electron microscope (SEM), mercury intrusion porosimetry (MIP) and backscattered electron imaging (BSE) are applied. The results show that IFC ternary solid waste admixture with high activity could accelerate hydration process of cement matrix, and the inert and unhydrated particles would also exert ‘micro-aggregate effect’, ‘nucleation effect’ and ‘dispersion effect’ to help promote strength of concrete.</p>

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Activation mechanism of iron tailings, fly ash and ceramic powder ternary solid waste admixture and enhancement of concrete preparation

  • 期刊论文

  • 发表日期：

    2025年6月25日

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  • Qi Wang,
  • Yannian Zhang,
  • Jianbin Zhao,
  • Moncef L. Nehdi,
  • Qingjie Wang

摘要

In order to achieve the goals of decarbonization and sustainable development, this study select iron tailings, fly ash, and ceramic powder (IFC) to prepare ternary solid-waste admixtures with multiple ratios. Different Ca(OH)₂ dosages and cement substitution rates are investigated to research the activation mechanism, aiming to resolve difficulties in activating multiple solid wastes added as supplementary cementitious materials and improve the concrete pore structure. Besides, multiple water to binder ratios, admixture dosages and mixing ratios of IFC are attempted to research the effect on concrete compressive strength for 7 days and 28 days of curing (7D and 28D). In addition, the fineness of iron tailings (IOTs) powder is tested for both research targets above. To further study the micro morphology of IOTs particles and pore structures of the prepared concrete, scanning electron microscope (SEM), mercury intrusion porosimetry (MIP) and backscattered electron imaging (BSE) are applied. The results show that IFC ternary solid waste admixture with high activity could accelerate hydration process of cement matrix, and the inert and unhydrated particles would also exert ‘micro-aggregate effect’, ‘nucleation effect’ and ‘dispersion effect’ to help promote strength of concrete.