脱硫石膏对碱激发胶凝材料性能及微观结构的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (8): 2933-2940.

脱硫石膏对碱激发胶凝材料性能及微观结构的影响

倪振坤¹, 薛力梨², 丁艳玲², 刘红飞², 刘开富¹

1.浙江理工大学建筑工程学院,杭州 310000;
2.嘉兴大学建筑工程学院,嘉兴 314001

收稿日期:2024-01-17 修订日期:2024-02-28 出版日期:2024-08-15 发布日期:2024-08-12
通信作者: 薛力梨,博士,高级实验师。E-mail:xuelili1316@126.com
作者简介:倪振坤(2000—),男,硕士研究生。主要从事碱激发胶凝材料的研究。E-mail:1968274805@qq.com
基金资助:
2023年度嘉兴市应用性基础研究项目(2023AY11039);2023年度大学生创新创业训练(SRT)计划(8517231039)

Effect of Desulfurization Gypsum on Properties and Microstructure of Alkali-Activated Cementitious Materials

NI Zhenkun¹, XUE Lili², DING Yanling², LIU Hongfei², LIU Kaifu¹

1. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310000, China;
2. College of Civil Engineering and Architecture, Jiaxing University, Jiaxing 314001, China

Received:2024-01-17 Revised:2024-02-28 Online:2024-08-15 Published:2024-08-12

摘要/Abstract

摘要： 将工业副产脱硫石膏引入碱激发胶凝材料,拟解决其高碱含量时凝结硬化过快问题,同时考察力学性能和水化反应特征,研究脱硫石膏对碱激发胶凝材料宏观性能影响规律,采用X射线衍射(XRD)、扫描电子显微镜(SEM)等微观分析手段探索脱硫石膏对碱激发胶凝材料的作用机理。结果表明:脱硫石膏的引入可以有效延缓碱激发胶凝材料的凝结时间,且脱硫石膏掺量与凝结时间呈正相关,与强度、水化速率和累积放热量呈负相关,综合考虑,脱硫石膏掺量不宜超过9%(质量分数);脱硫石膏掺入后,碱激发胶凝材料水化产物中并未生成大量钙矾石晶体,且微观结构疏松,从而导致材料强度降低。

关键词: 脱硫石膏, 碱激发材料, 凝结时间, 抗压强度, 水化热, 微观结构

Abstract: The rapid setting characteristic of alkali-activated cementitious materials (AACM) has restricted its wide application in engineering, especially at high alkali dosage. In this study, an industrial by-product desulfurization gypsum was introduced into AACM to solve this problem. Meanwhile, mechanical properties and hydration reaction characteristics were investigated to study the effect of desulfurization gypsum on the properties of AACM, and microscopic analysis methods such as XRD and SEM were used to explore the action mechanism of desulfurization gypsum on AACM. The results indicate that the incorporation of desulfurization gypsum can effectively prolong the setting time of AACM, and that the content of desulfurization gypsum is positively correlated with the setting time, but negatively correlated with the strength, hydration heat flow and total heat, the content of desulfurization gypsum should not exceed 9% (mass fraction) of the cementitious materials. The incorporation of desulfurization gypsum does not produce a large number of ettringite crystals in matrix of AACM, however, the microstructure is loosened which resulted in a decrease in strength.

Key words: desulfurization gypsum, alkali-activated material, setting time, compressive strength, hydration heat, microstructure

中图分类号:

TU525

倪振坤, 薛力梨, 丁艳玲, 刘红飞, 刘开富. 脱硫石膏对碱激发胶凝材料性能及微观结构的影响[J]. 硅酸盐通报, 2024, 43(8): 2933-2940.

NI Zhenkun, XUE Lili, DING Yanling, LIU Hongfei, LIU Kaifu. Effect of Desulfurization Gypsum on Properties and Microstructure of Alkali-Activated Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2933-2940.

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