摘要
为了改善改性硫氧镁(Modified magnesium oxysulfate, MMOS)水泥基材料的性能,研究了二次铝灰烧结渣料磨细粉(DF)对MMOS水泥基材料工作性能和力学性能的影响,采用XRD、SEM、FTIR、TG等微观测试技术对其影响机理进行了分析。结果表明:随着DF掺量增加,MMOS水泥基材料的工作性能呈增长趋势,当DF掺量在10%以内时,力学性能早期变化不大,后期呈增长趋势,且在低水胶比时力学性能更优。随着养护龄期延长,不同DF掺量的MMOS水泥试样早期力学性能变化不明显,而在后期力学性能显著增长。微观分析表明,过高的DF掺量会延缓水化反应进程,导致水化产物5·1·7相(5Mg(OH)_(2)·MgSO_(4)·7H_(2)O)生成速率降低,从而改善MMOS水泥基材料的工作性能,但会降低其早期力学性能。此外,MMOS水泥基材料中的重金属及有害物质浸出含量指标符合《水泥窑协同处置固体废弃物技术规范》标准。这为发挥建材领域对二次铝灰的消纳能力,实现其高值资源化利用提供理论依据。
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)·MgSO_(4)·7H_(2)O),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.
作者
崔嘉铭
马红瑞
马哲洋
纪璐鑫
王胜
巴明芳
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)
出处
《材料导报》
北大核心
2025年第15期154-162,共9页
Materials Reports
基金
国家自然科学基金(51978346)
浙江省大学生科技创新活动计划项目(2023R405087)。
关键词
二次铝灰烧结渣料磨细粉
改性硫氧镁水泥基材料
工作性能
力学性能
重金属浸出
水化机理
secondary aluminum ash sintering slag grinding fine powder
modified magnesium oxysulfide cement-based material
workability
mechanical property
heavy metal leaching
hydration mechanism
