水泥固化高岭土物相分布的热力学模型预测研究

葛津宇; 徐菲; 韩迅; 韩雪松; 钱文勋; 李怀森

doi:10.11779/CJGE20240732

水泥固化高岭土物相分布的热力学模型预测研究 English Version

1.
南京水利科学研究院，江苏南京 210029, 中国;2
1.
南京水利科学研究院，江苏南京 210029, 中国

基金项目: 国家自然科学基金资助项目(52109161、52309161);中国博士后科学基金项目(2021M691630);江苏省自然科学基金(BK20230120);

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出版历程
- 收稿日期: 2024-07-23
- 网络出版日期: 2025-03-25

Thermodynamic model for predicting mineral phase distribution in cement-stabilized kaolinite systems

摘要

摘要: 针对水泥固化土（水泥土）物相分布的定量分析，探索提出基于化学热力学模型的新方法。采用物相成分相对简单的商用高岭土，制备不同水泥掺量、胶水比，以及不同剂量NaOH/KOH激发的水泥土样品，并通过X射线衍射（XRD）与29Si-核磁共振（29Si-NMR）技术对样品的物相分布进行定性和定量表征。基于化学热力学模拟软件GEMS和数据库Cemdata18构建水泥土热力学模型，模拟不同水泥掺量和碱激发条件下水泥土的物相成分演化，并对比分析模拟结果与微观表征结果。研究表明：热力学模型能可靠预测不同配比下水泥土体系的物相分布演化规律；水泥和外掺碱对土体中高聚合度基团存在不同程度的"溶解−聚合"效应，并且碱的种类对黏土矿物的解聚及聚合产物的种类与结构特性有显著影响。
- 热力学 /
- 水泥土 /
- 物相预测 /
- 溶解-聚合 /
- 定量分析
Abstract: In this study, a new method based on the chemical thermodynamic model was proposed to quantitatively predict the phase distribution in cemented soil. The commercial kaolinite with simple phase composition was selected, and a series of cemented kaolinite samples were prepared by adjusting the cement content, binder-water ratio, and NaOH/KOH doses. The samples were then characterized qualitatively and quantitatively using X-ray diffraction (XRD) and 29Si-nuclear magnetic resonance (29Si-NMR) techniques, respectively. Then, a thermodynamic model of cemented kaolinite was constructed using the GEMS software and the chemical thermodynamic database Cemdata18, simulating the evolution of mineral distribution in cemented kaolinite under different cement contents and alkali activation conditions. The simulation results were compared and analyzed with the micro-characterization results. The research indicates that the thermodynamic model can reliably predict the mineral distribution evolution in cemented kaolinite. Meanwhile, cement and alkalis have varying maginitude of "dissolution-polymerization" effects on the high polymerization chemical groups in soil, and the type of alkali significantly affects the depolymerization of clay minerals and the type and structural characteristics of the polymerization products.
- thermodynamic /
- cemented soil /
- phase prediction /
- dissolution-polymerization /
- quantitative analysis

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