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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

LI Xiaopeng ZENG Fanchao WANG Qin WANG Jian XU Kexin GUO Zhixiang

硅酸盐通报2025，Vol.44Issue(12)：4314-4324,11.
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硅酸盐通报2025，Vol.44Issue(12)：4314-4324,11.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

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

LI Xiaopeng 1ZENG Fanchao 1WANG Qin 2WANG Jian 1XU Kexin 1GUO Zhixiang1

作者信息

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

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.

关键词

石膏/溶解速率/无碱液体速凝剂/相容性/钙矾石

Key words

gypsum/dissolution rate/alkali-free liquid accelerator/compatibility/ettringite

分类

建筑与水利

引用本文复制引用

LI Xiaopeng,ZENG Fanchao,WANG Qin,WANG Jian,XU Kexin,GUO Zhixiang..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):4314-4324,11.

基金项目

国家自然科学基金(52278237) （52278237）

运城市"揭榜挂帅"项目 （）

硅酸盐通报

OA北大核心

1001-1625

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