矿渣-硫酸盐对循环流化床飞灰基胶凝材料的复合增强效应研究

doi:10.16552/j.cnki.issn1001-1625.2024.1453

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (4): 1337-1345.DOI: 10.16552/j.cnki.issn1001-1625.2024.1453

矿渣-硫酸盐对循环流化床飞灰基胶凝材料的复合增强效应研究

梅文政^1,2, 高鹏³, 蔚畅⁴, 原皓⁴, 周明凯^1,2

1.武汉理工大学材料科学与工程学院,武汉 430070;
2.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
3.山西省煤系固废建材资源化利用技术创新中心,长治 047599;
4.长治市武理工工程技术研究院,长治 046004

收稿日期:2024-11-28 修订日期:2024-12-27 出版日期:2025-04-15 发布日期:2025-04-18
通信作者: 周明凯,博士,教授。E-mail:zhoumingkai@163.com
作者简介:梅文政(2000—),男,硕士研究生。主要从事固废基煤矿充填材料应用研究。E-mail:mwz777al@163.com
基金资助:
中央引导地方科技发展资金项目(YDZJXS2022B016)

Composite Reinforcement Effect of GGBFS-Sulfate on CFBFA-Based Cementitious Materials

MEI Wenzheng^1,2, GAO Peng³, YU Chang⁴, YUAN Hao⁴, ZHOU Mingkai^1,2

1. School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
3. Shanxi Coal Measures Solid Waste Building Materials Resource Utilization Technology Innovation Center, Changzhi 047599, China;
4. Institute of Wuhan University of Technology, Changzhi 046004, China

Received:2024-11-28 Revised:2024-12-27 Published:2025-04-15 Online:2025-04-18

摘要/Abstract

摘要： 利用粒化高炉矿渣(GGBFS)与硫酸盐对循环流化床飞灰(CFBFA)基胶凝材料进行复合增强改性。固定胶凝材料中水泥掺量为30%(质量分数,下同),CFBFA和GGBFS总掺量为70%,外掺0%~4%脱硫石膏、0%~1.5%硫酸钠,研究CFBFA与GGBFS质量比及脱硫石膏、硫酸钠两种硫酸盐的掺量对复合胶凝材料凝结时间、胶砂抗压强度的影响,并通过X射线衍射(XRD)和扫描电子显微镜(SEM)探究GGBFS和硫酸盐对CFBFA基胶凝材料的复合增强机理。结果表明:CFBFA基胶凝材料凝结时间长、抗压强度低;CFBFA与GGBFS复合后能显著提高胶凝材料的3、7 d抗压强度,但28 d抗压强度提升有限;在CFBFA-GGBFS复合体系中引入硫酸盐能提高抗压强度,其中脱硫石膏与低掺量CFBFA胶凝体系的复合效应更好,脱硫石膏的适宜掺量为2%,硫酸钠与高掺量CFBFA体系的复合效应更佳,但对28 d抗压强度有负面影响,硫酸钠的适宜掺量为0.5%;CFBFA与GGBFS复合增加了胶凝材料水化早期的凝胶生成量;脱硫石膏能提高钙矾石(AFt)的形成速率并稳定其生长;硫酸钠与Ca(OH)₂反应生成了强碱性NaOH和高活性CaSO₄,进一步增加了凝胶和AFt的生成速率。

关键词: 循环流化床飞灰, 胶凝材料, 粒化高炉矿渣, 脱硫石膏, 硫酸钠, 复合增强

Abstract: Ground granulated blast furnace slag (GGBFS) and sulfate were used to reinforce and modify circulating fluidized bed fly ash (CFBFA)-based cementitious materials. The cement content in cementitious material was 30% (mass fraction, the same below), the total content of CFBFA and GGBFS was 70%, and the addition of desulfurization gypsum and sodium sulfate was 0%~4% and 0%~1.5%, respectively. The effects of the mass ratio of CFBFA and GGBFS and the content of desulfurization gypsum and sodium sulfate on the setting time and mortar compressive strength of the composite cementitious materials were studied. Then the composite reinforcement mechanism of GGBFS and sulfate on CFBFA-based cementitious materials was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that CFBFA-based cementitious materials have long setting time and low compressive strength. The composite of CFBFA and GGBFS can significantly improve the 3 and 7 d compressive strength of cementitious materials, but the reinforcement strength of 28 d is limited. The introduction of sulfate in CFBFA-GGBFS system can significantly improve the compressive strength. Desulfurization gypsum whose suitable content is 2% is more effective in improving the strength of low content CFBFA system, and sodium sulfate whose suitable content is 0.5% have a better effect on the strength reinforcement of high content CFBFA system, but sodium sulfate has a negative effect on the 28 d compressive strength. The composite of CFBFA and GGBFS increases the amount of gel generation in the early hydration stage of cementitious materials. Desulfurization gypsum can accelerate the formation rate of ettringite (AFt) and stabilize its growth. Sodium sulfate reacts with Ca(OH)₂ to form strong alkaline NaOH and highly active CaSO₄, which further increases the formation rate of gel and AFt.

Key words: circulating fluidized bed fly ash, cementitious material, ground granulated blast furnace slag, desulfurization gypsum, sodium sulfate, reinforcement effect

中图分类号:

TU526

梅文政, 高鹏, 蔚畅, 原皓, 周明凯. 矿渣-硫酸盐对循环流化床飞灰基胶凝材料的复合增强效应研究[J]. 硅酸盐通报, 2025, 44(4): 1337-1345.

MEI Wenzheng, GAO Peng, YU Chang, YUAN Hao, ZHOU Mingkai. Composite Reinforcement Effect of GGBFS-Sulfate on CFBFA-Based Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(4): 1337-1345.

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矿渣-硫酸盐对循环流化床飞灰基胶凝材料的复合增强效应研究

Composite Reinforcement Effect of GGBFS-Sulfate on CFBFA-Based Cementitious Materials

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