黄河泥沙对水泥材料性能及微结构的影响

doi:10.6040/j.issn.1672-3961.0.2024.077

摘要/Abstract

摘要： 为研究黄河泥沙对水泥材料性能的影响,采用黄河泥沙部分替代水泥制备砂浆,研究泥沙质量分数对砂浆流动度、凝结时间、力学性能的影响,并通过微观试验分析泥沙对水泥水化过程、水化产物和微观结构的影响。结果表明:泥沙的掺入导致浆体凝结时间缩短、流动性降低,其28 d活性指数为66.5%,主要发挥物理填充作用贡献基体强度;泥沙中CaCO₃为水泥水化提供成核位点,加速水泥早期水化进程;CaCO₃与C₃A发生反应,生成单碳酸盐(monocarbonate, MC),Ca(OH)₂参与上述反应,生成半碳酸盐(hemicarbonate, HC),抑制钙矾石(ettringite, AFt)向单硫型硫铝酸钙(monosulphate, AFm)转变。

关键词: 黄河泥沙-水泥复合体系, 流动性, 活性指数, 水化过程, 微观结构

Abstract: In order to study the influence of Yellow River sand on the properties of cement materials,the sand was used to prepare mortar by replacing cement partially. Then, the effect of different sand content on flowability, setting time, and mechanical properties were studied, and the influence of Yellow River sand on cement hydration process, phase composition and microstructure were analyzed through microscopic tests. The results showed that the Yellow River sand shorten the setting time and reduced the fluidity of slurry. The activity index of Yellow River sand on the 28th day was 66.5%, indicating that it played a physical filling role in improving the matrix strength. CaCO₃ in the Yellow River sand provided nucleation sites for cement hydration and accelerated the early hydration process. CaCO₃ also reacted with C₃A to form monocarbonate(MC). And the Ca(OH)₂ participated in the above reaction to form hemicarbonate(HC), which inhibited the transition from ettringite(AFt)to monosulphate(AFm).

Key words: Yellow River sand-cement composite system, liquidity, activity index, cement hydration, microstructure

中图分类号:

TU526

韩璐,周爱平,孙柯,万田涛,隋高阳,葛智,张洪智. 黄河泥沙对水泥材料性能及微结构的影响[J]. 山东大学学报 (工学版), 2025, 55(3): 121-127.

HAN Lu, ZHOU Aiping, SUN Ke, WAN Tiantao, SUI Gaoyang, GE Zhi, ZHANG Hongzhi. Influence of Yellow River sand on the mechanical properties and microstructure of cementitious materials[J]. Journal of Shandong University(Engineering Science), 2025, 55(3): 121-127.

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