硫酸钙提升水泥-矿渣基泡沫混凝土抗干燥收缩性能的研究

doi:10.16552/j.cnki.issn1001-1625.2024.1544

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (7): 2557-2565.DOI: 10.16552/j.cnki.issn1001-1625.2024.1544

硫酸钙提升水泥-矿渣基泡沫混凝土抗干燥收缩性能的研究

刘威呈^1,2, 王琼², 陈伟³, 曾维来², 黄明洋², 袁波¹

1.武汉理工大学材料科学与工程学院,武汉 430070;
2.中建海龙科技有限公司,深圳 518110;
3.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070

收稿日期:2024-12-16 修订日期:2025-01-13 出版日期:2025-07-15 发布日期:2025-07-24
通信作者: 袁波,博士,副教授。E-mail:yuan.bo@whut.cn
作者简介:刘威呈(1998—),男,硕士研究生。主要从事纳米泡沫混凝土的研究。E-mail:1261404626@qq.com

Enhancement of Drying Shrinkage Resistance of Cement-Slag Based Foam Concrete by Calcium Sulfate

LIU Weicheng^1,2, WANG Qiong², CHEN Wei³, ZENG Weilai², HUANG Mingyang², YUAN Bo¹

1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. China Construction Hailong Technology Co., Ltd., Shenzhen 518110, China;
3. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China

Received:2024-12-16 Revised:2025-01-13 Published:2025-07-15 Online:2025-07-24

摘要/Abstract

摘要： 泡沫混凝土具有良好的隔热、隔音性能,但干燥收缩较大,在实际工程应用中容易产生裂纹。本研究以矿渣替代部分水泥,通过掺入无水硫酸钙调控浆体硫酸根浓度,促进钙矾石结晶形成过渡结构,实现基体抗压强度优化与干燥收缩降低的协同调控。结果表明,当硫酸钙掺量为1%~15%(质量分数)时,泡沫混凝土浆体的流动度随硫酸钙掺量增加先增大后减小,沉降距离、干燥收缩率随硫酸钙掺量增加先降低后增大。相较于对照组,当硫酸钙掺量为5%时,泡沫混凝土浆体流动度提高4.1%,90 min浆体沉降距离最小(0.13 mm),28 d抗压强度提高17.4%,干燥收缩率降低28.0%。适量钙矾石晶体可通过形成过渡结构来减少干燥收缩,进而降低泡沫混凝土开裂风险。本研究为硫酸钙用于抗干燥收缩泡沫混凝土的制备提供了理论依据与技术路径。

关键词: 泡沫混凝土, 矿渣, 钙矾石, 无水硫酸钙, 干燥收缩, 过渡结构

Abstract: Foam concrete has good heat insulation and sound insulation properties, but the drying shrinkage is large, and it is easy to crack in practical engineering applications. In this study, slag was used to replace part of cement. By adding anhydrous calcium sulfate to regulate the concentration of sulfate in slurry, the crystallization of ettringite was promoted to form transition structure, and the synergistic regulation of matrix compressive strength optimization and drying shrinkage reduction was realized. The results show that when the content of calcium sulfate is 1%~15% (mass fraction), the fluidity of foam concrete slurry increases first and then decreases with the increase of calcium sulfate content, and the settlement distance and drying shrinkage of foam concrete slurry increase first and then decrease with the increase of calcium sulfate content. When the content of calcium sulfate is 5%, compared with the control group, the fluidity of foam concrete slurry increases by 4.1%, the settlement distance of slurry at 90 min is the smallest (0.13 mm), the compressive strength at 28 d increases by 17.4%, and the drying shrinkage rate reduces by 28.0%. Appropriate amount of ettringite crystals can reduce the drying shrinkage by forming a transition structure, thereby reducing the cracking risk of foam concrete. This study provides a theoretical basis and technical path for the preparation of calcium sulfate used for anti-dry shrinkage foam concrete.

Key words: foam concrete, slag, ettringite, anhydrous calcium sulfate, drying shrinkage, transitional structure

中图分类号:

TU528.2

刘威呈, 王琼, 陈伟, 曾维来, 黄明洋, 袁波. 硫酸钙提升水泥-矿渣基泡沫混凝土抗干燥收缩性能的研究[J]. 硅酸盐通报, 2025, 44(7): 2557-2565.

LIU Weicheng, WANG Qiong, CHEN Wei, ZENG Weilai, HUANG Mingyang, YUAN Bo. Enhancement of Drying Shrinkage Resistance of Cement-Slag Based Foam Concrete by Calcium Sulfate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2557-2565.

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硫酸钙提升水泥-矿渣基泡沫混凝土抗干燥收缩性能的研究

Enhancement of Drying Shrinkage Resistance of Cement-Slag Based Foam Concrete by Calcium Sulfate

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