不同石膏种类对硅酸盐水泥与无碱液体速凝剂相容性的影响

doi:10.16552/j.cnki.issn1001-1625.2025.0563

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (12): 4314-4324.DOI: 10.16552/j.cnki.issn1001-1625.2025.0563

不同石膏种类对硅酸盐水泥与无碱液体速凝剂相容性的影响

李霄鹏¹, 曾凡超¹, 王琴^1,2, 王健¹, 徐可心¹, 郭志翔¹

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.山西省高性能外加剂材料技术创新中心,运城 044200

收稿日期:2025-06-09 修订日期:2025-07-11 出版日期:2025-12-15 发布日期:2025-12-30
通信作者: 王琴,博士,教授。E-mail:wangqin@bucea.edu.cn
作者简介:李霄鹏(2000—),男,硕士研究生。主要从事防水涂料、水泥等建筑材料的研究。E-mail:lixiaopengbucea@163.com
基金资助:
国家自然科学基金(52278237);运城市“揭榜挂帅”项目

Effects of Different Types of Gypsum on Compatibility Between Portland Cement and Alkali-Free Liquid Accelerator

LI Xiaopeng¹, ZENG Fanchao¹, WANG Qin^1,2, WANG Jian¹, XU Kexin¹, GUO Zhixiang¹

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. Shanxi Center of Technology Innovation for High Performance Admixture Material, Yuncheng 044200, China

Received:2025-06-09 Revised:2025-07-11 Published:2025-12-15 Online:2025-12-30

摘要/Abstract

摘要： 石膏种类不同会对喷射混凝土中水泥与无碱液体速凝剂的相容性产生影响。在掺加无碱液体速凝剂的情况下,本研究通过净浆凝结时间和砂浆抗压强度测试分别对比了无水石膏、半水石膏及二水石膏对水泥宏观性能的影响,通过水化热测试、X射线衍射分析、热重分析和扫描电子显微镜等微观测试方法揭示了水泥中石膏种类的变化对水泥水化的影响机理。结果表明:在无碱液体速凝剂作用下,石膏种类会对水泥与其相容性产生影响,石膏溶解速率变小,其中溶解速率由大到小依次为半水石膏、二水石膏、无水石膏;水泥浆体的早期水化放热越大,浆体的凝结硬化越快,同时,水泥水化也更充分,水化产物中氢氧化钙和水化硅酸钙凝胶的生成量更多,从而使硬化砂浆保持较高的力学性能。但是,水泥中石膏种类的改变只会对体系的早期水化进程及硬化后浆体的微观结构造成一定影响,对硬化水泥浆体水化后期的力学性能、水化产物及微观形貌基本没有影响。本研究为理解不同种类石膏对水泥与无碱液体速凝剂相容性的影响提供重要的理论依据和实践参考。

关键词: 石膏, 溶解速率, 无碱液体速凝剂, 相容性, 钙矾石

Abstract: Different types of gypsum can affect the compatibility between cement and alkali-free liquid accelerators in shotcrete. This study compared the effects of anhydrite, hemihydrate, and dihydrate gypsum on the macroscopic properties of cement by examining cement paste setting time and mortar compressive strength, with the addition of alkali-free liquid accelerator. The mechanism by which gypsum type affects cement hydration was revealed using microstructural testing methods, such as heat of hydration testing, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy. The results indicate that, under the influence of an alkali-free liquid accelerator, the types of gypsum significantly impact the compatibility between cement and gypsum. The dissolution rates of gypsum decrease in the following order:hemihydrate, dihydrate, and anhydrite, with a lower dissolution rate contributing to a higher early heat release in the cement paste, thus accelerating the setting and hardening process. Moreover, the hydration of the cement becomes more complete, and a greater amount of calcium hydroxide and calcium silicate hydrate gel is produced in the hydration products, resulting in enhanced mechanical performance of the hardened mortar. However, the change of gypsum type in cement only affects the early hydration process and the microstructure of the hardened cement paste, with no significant impact on the mechanical properties, hydration products, and microstructure in the later stages of hydration. This study provides an important theoretical basis and practical reference for understanding the effects of different gypsum types on the compatibility between cement and alkali-free liquid accelerators.

Key words: gypsum, dissolution rate, alkali-free liquid accelerator, compatibility, ettringite

中图分类号:

TU528.042

李霄鹏, 曾凡超, 王琴, 王健, 徐可心, 郭志翔. 不同石膏种类对硅酸盐水泥与无碱液体速凝剂相容性的影响[J]. 硅酸盐通报, 2025, 44(12): 4314-4324.

LI Xiaopeng, ZENG Fanchao, WANG Qin, WANG Jian, XU Kexin, GUO Zhixiang. Effects of Different Types of Gypsum on Compatibility Between Portland Cement and Alkali-Free Liquid Accelerator[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(12): 4314-4324.

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不同石膏种类对硅酸盐水泥与无碱液体速凝剂相容性的影响

Effects of Different Types of Gypsum on Compatibility Between Portland Cement and Alkali-Free Liquid Accelerator

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