氯化钙激发粉煤灰基充填材料水化的机理及动力学特征

罗鹏翔; 邓念东; 解耿; 邢聪聪; 李宇新

doi:10.13205/j.hjgc.202306009

氯化钙激发粉煤灰基充填材料水化的机理及动力学特征

doi: 10.13205/j.hjgc.202306009

1. 西安科技大学地质与环境学院, 西安 710054;
2. 西安科技大学能源学院, 西安 710054

基金项目:

国家自然科学基金项目（41702377）；中国博士后科学基金项目（2017M623208）；陕西省自然科学基础研究计划项目（2017JQ4008）

详细信息

作者简介:
罗鹏翔(1998-),女,硕士生,主要研究方向为矿山环境恢复及后期治理。luopengxiang0115@163.com

通讯作者:
罗鹏翔(1998-),女,硕士生,主要研究方向为矿山环境恢复及后期治理。luopengxiang0115@163.com

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出版历程
- 收稿日期: 2022-06-17
- 网络出版日期: 2023-09-02

HYDRATION MECHANISM AND KINETIC CHARACTERISTICS OF CaCl₂ EXCITING FLY ASH PASTE FILLING MATERIALS

1. College of Geology & Environment, Xian University of Science and Technology, Xi'an 710054, China;
2. College of Energy Engineering, Xian University of Science and Technology, Xi'an 710054, China

摘要

摘要: 胶结充填材料的早期水化动力学特征是合理设计配比的重要前提。采用等温量热法测量了不同CaCl₂浓度激发粉煤灰膏体充填材料（FPFM）的早期水化放热情况，基于Krstulovic-Dabic水化动力学模型对不同FPFM早期水化放热进行拟合，计算其水化动力学参数，对水化动力过程各阶段的变化特征进行分析，并对CaCl₂的激发机理做出解释。结果表明：随着CaCl₂浓度增加，FPFM水化热量从1.1 mW/g增大至2.9 mW/g，总累计放热量从16.4 J/g增大至29.6 J/g，诱导阶段和加速阶段持续时间缩短，使其水化反应速率加快，水化反应程度加深。CaCl₂激发FPFM的水化机理均为成核和晶体生长（NG）→扩散（I）→相边界作用（D），随着CaCl₂浓度增加，FPFM动力学参数均增大，I阶段持续时间延长，促进了粉煤灰的火山灰反应，产生了更多的水化产物。因此，通过对CaCl₂激发FPFM早期水化动力学特征的研究，揭示了其结构演化的规律，对FPFM的现场应用提供理论参考。
- 膏体充填材料 /
- 氯化钙激发 /
- 热演化 /
- 水化动力学 /
- 水化机制
Abstract: The early hydration kinetics of cementitious filling materials is an important prerequisite for reasonable designed ratios. In this paper, the early hydration exothermic condition of fly ash paste filling materials (FPFM) with different CaCl₂ concentration excitation was measured by isothermal calorimetry, and the early hydration exothermic heat of different FPFM was fitted based on the Krstulovic-Dabic hydration kinetic model. The hydration kinetic parameters were calculated, the variation characteristics of each stage of the hydration dynamic process were analyzed, and the excitation mechanism of CaCl₂ was explained. The results showed that with the increase of CaCl₂ concentration, the hydration heat of FPFM increased from 1.1 mW/g to 2.9 mW/g, and the total cumulative heat release increased from 16.4 J/g to 29.6 J/g, so that the hydration reaction rate was accelerated and the degree of hydration reaction was deepened. The hydration mechanism of FPFM stimulated by CaCl₂ was NG→I→D, and with the increase of CaCl₂ concentration, the kinetic parameters of FPFM were increased, and the duration of phase I was prolonged, which promoted the pozzarash reaction of fly ash and produced more hydration products. Therefore, through the study of the early hydration kinetic characteristics of CaCl₂ exciting FPFM, the law of its structural evolution is revealed, which provides a certain guide for the application of FPFM.
- paste backfill material /
- calcium chloride excitation /
- thermal evolution /
- hydration kinetics /
- hydration mechanism

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