氟化物对石膏基胶凝材料结构和性能的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (9): 3248-3257.

氟化物对石膏基胶凝材料结构和性能的影响

郭志翔¹, 王琴¹, 张秋臣¹, 郑海宇¹, 刘克俊²

1.北京建筑大学土木与交通工程学院,建筑结构与环境修复功能材料北京市重点实验室,北京 100044;
2.北京生态家园科技集团有限公司,北京 102628

收稿日期:2023-05-08 修订日期:2023-05-28 出版日期:2023-09-15 发布日期:2023-09-14
通信作者: 王琴,博士,副教授。E-mail:wangqin@bucea.edu.cn
作者简介:郭志翔(1998—),男,硕士研究生。主要从事石膏、水泥等建筑材料方面的研究。E-mail:guozhixiang1226@163.com
基金资助:
国家自然科学基金(52278237)

Effect of Fluoride on Structure and Properties of Gypsum-Based Cementitious Materials

GUO Zhixiang¹, WANG Qin¹, ZHANG Qiuchen¹, ZHENG Haiyu¹, LIU Kejun²

1. Key Laboratory of Functional Materials for Building Structure and Environment Remediation, School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
2. Beijing Eco Home Technology Group Co., Ltd., Beijing 102628, China

Received:2023-05-08 Revised:2023-05-28 Online:2023-09-15 Published:2023-09-14

摘要/Abstract

摘要： 磷石膏中不同氟杂质对硬化石膏浆体微观结构和性能的影响不同。本文通过凝结时间、原位水化热、离子浓度测试、力学性能测试、压汞测试、X射线衍射分析、X射线光电子能谱和扫描电子显微镜等测试手段,系统研究了四种氟杂质(CaF₂、NaF、Na₂SiF₆和Na₃AlF₆)对建筑石膏水化进程、微观结构和力学性能的影响。结果表明,可溶性氟杂质会促进建筑石膏水化,表现出一定的促凝效果,氟杂质溶解度越高,对建筑石膏水化进程的促进效果越显著(NaF>Na₃AlF₆>Na₂SiF₆),难溶的CaF₂对建筑石膏的水化进程基本没有影响。但是水化速度过快易造成浆体过早硬化,使一些建筑石膏不能及时水化,在后续缓慢水化过程中逐渐生长成板状晶体,使硬化浆体的孔隙率增加,从而导致硬化石膏浆体的力学性能变差。本研究为磷石膏在建材产品中的高效利用提供一定指导。

关键词: 磷石膏, 氟杂质, 石膏水化, 微观结构, 孔隙率, 力学性能

Abstract: The different fluorine impurities in phosphogypsum have varying effects on the microstructure and properties of hardened gypsum paste, and their mechanisms are not yet clear, which affects the recycling of phosphogypsum resources. In this paper, through testing methods such as setting time, in-situ hydration heat, ion concentration, mechanical properties, mercury intrusion, X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy, the effects of four types of fluorine impurities (CaF₂, NaF, Na₂SiF₆, and Na₃AlF₆) on the hydration process, microstructure, and mechanical properties of calcined gypsum were systematically studied. The results show that, soluble fluorine impurities can promote the hydration of calcined gypsum, showing a certain effect of promoting coagulation. The higher the solubility of fluorine impurities is, the more significant the promotion effect on the hydration process of calcined gypsum (NaF>Na₃AlF₆>Na₂SiF₆) is. Insoluble CaF₂ has little effect on the hydration process of calcined gypsum. However, excessively fast hydration rate can lead to premature hardening of the slurry, preventing some calcined gypsum from hydrating promptly. Consequently, these calcined gypsum may gradually transform into plate-like crystals during subsequent slow hydration, increasing the porosity of the hardened gypsum paste and impairing its mechanical properties. This study provides certain guidance for the efficient utilization of phosphogypsum in building materials.

Key words: phosphogypsum, fluorine impurity, gypsum hydration, microstructure, porosity, mechanical property

中图分类号:

TQ177

郭志翔, 王琴, 张秋臣, 郑海宇, 刘克俊. 氟化物对石膏基胶凝材料结构和性能的影响[J]. 硅酸盐通报, 2023, 42(9): 3248-3257.

GUO Zhixiang, WANG Qin, ZHANG Qiuchen, ZHENG Haiyu, LIU Kejun. Effect of Fluoride on Structure and Properties of Gypsum-Based Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3248-3257.

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