Study on the Effect and Mechanism of Secondary Aluminum Ash Sintering Slag Grinding Fine Powder on the Properties of Modified Magnesium Sulfide Cement-based Materials
CUI Jiaming, MA Hongrui, MA Zheyang, JI Luxin, WANG Sheng, BA Mingfang*
School of Civil & Environment Engineering and Geography Science, Ningbo University, Ningbo 315211, Zhejiang, China
Abstract: In order to improve the performance of modified magnesium oxide (MMOS) cement-based materials, the influence of secondary aluminum ash sintering slag grinding fine powder (DF) on their workability and mechanical properties was investigated. Microscopic testing techniques including XRD, SEM, FTIR, and TG were employed to analyze the mechanism of this influence. The results indicate that with increasing of DF content, the workability of MMOS cement-based materials is promoted,when the DF content is within 10%. The mechanical properties initially show little variation but tend to increase with higher DF content, particularly at lower water-cement ratios. As curing time progresses, early-stage mechanical properties of MMOS cement specimens with different DF contents exhibit minimal change, while significant improvement is observed in later stages. Microscopic analysis reveals that excessive DF content delays the hydration reaction process, leading to a decreased rate of hydration product formation such as 5·1·7 phase (5Mg(OH)2·MgSO4·7H2O), thereby enhancing the workability of MMOS cement-based materials while reducing their early-stage mechanical properties. Furthermore, leaching tests confirm that heavy metal and harmful substance content in MMOS cement-based materials comply with standards set by the "Technical Specification for Cement Kiln Co-processing of Solid Waste". These findings provide a theoretical foundation for utilizing secondary aluminum ash in building materials, emphasizing its potential for high-value resource utilization.
崔嘉铭, 马红瑞, 马哲洋, 纪璐鑫, 王胜, 巴明芳. 二次铝灰烧结渣料磨细粉对改性硫氧镁水泥基材料性能的影响及机理研究[J]. 材料导报, 2025, 39(15): 24040219-9.
CUI Jiaming, MA Hongrui, MA Zheyang, JI Luxin, WANG Sheng, BA Mingfang. Study on the Effect and Mechanism of Secondary Aluminum Ash Sintering Slag Grinding Fine Powder on the Properties of Modified Magnesium Sulfide Cement-based Materials. Materials Reports, 2025, 39(15): 24040219-9.
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2025, Vol. 39 
