In order to utilize the absorption capacity of secondary aluminum ash in cement industry, and achieve the carbon reduction and emission reduction goals of the cement industry, the influence of different fineness and content of secondary aluminum ash sintering and grinding fine powder (MP) on the mechanical properties and shrinkage characteristics of Portland cement matrix was studied. Microstructural analysis was conducted using techniques such as XRD, TG, SEM, BET, and XPS. The results indicate that increasing the fineness and content of MP can delay the hydration process of the Portland cement matrix, leading to elevated porosity, and consequently deteriorate the early mechanical properties. The study also found that the hydrolysis of AlN in the hardened Portland cement matrix to produce NH intensifies the early expansion deformation of the Portland cement matrix. At the same time, the delay of hydration reaction causes a decrease in the content of hydration products such as AFt and an increase in porosity, thereby exacerbating the long-term shrinkage deformation of the Portland cement matrix. In addition, ICP and XPS analysis showed that the content of heavy metals and harmful substances in the Portland cement matrix was relatively low, meeting the relevant standards for harmless treatment.

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二次铝灰烧结磨细粉对硅酸盐水泥基体力学性能及收缩特性的影响

为了利用水泥行业二次铝灰的吸收能力，实现水泥行业的减碳减排目标，研究了不同细度和含量的二次铝灰烧结研磨细粉（MP）对水泥行业的减碳减排目标。研究了硅酸盐水泥基体的力学性能和收缩特性。使用 XRD、TG、SEM、BET 和 XPS 等技术进行微观结构分析。结果表明，增加MP的细度和含量会延迟硅酸盐水泥基体的水化过程，导致孔隙率升高，从而损害早期力学性能。研究还发现，硬化硅酸盐水泥基体中AlN水解产生NH，加剧了硅酸盐水泥基体的早期膨胀变形。同时，水化反应的延迟导致AFt等水化产物含量减少、孔隙率增加，从而加剧硅酸盐水泥基体的长期收缩变形。另外，ICP和XPS分析表明，硅酸盐水泥基质中重金属和有害物质含量较低，符合无害化处理的相关标准。