含硫酸盐类固废对硅酸盐水泥水化影响研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (5): 1710-1720.

所属专题：资源综合利用

含硫酸盐类固废对硅酸盐水泥水化影响研究

杜新宇¹, 陈潇^1,2, 周明凯^1,2, 张浩宇¹, 杨寅¹, 王瑜德³

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.武汉船舶职业技术学院,武汉 430070

收稿日期:2023-03-09 修订日期:2023-04-25 出版日期:2023-05-15 发布日期:2023-06-01
通信作者: 陈潇,博士,副研究员。E-mail:chenxiao1981@whut.edu.cn
作者简介:杜新宇(1997—),男,硕士研究生。主要从事固体废弃物处置与资源化利用方向的研究。E-mail:1310846376@qq.com
基金资助:
国家自然科学基金(52272025)

Effects of Sulfate-Containing Solid Wastes on Hydration of Portland Cement

DU Xinyu¹, CHEN Xiao^1,2, ZHOU Mingkai^1,2, ZHANG Haoyu¹, YANG Yin¹, WANG Yude³

1. School of Materials 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. Wuhan Institute of Shipbuilding Technology, Wuhan 430070, China

Received:2023-03-09 Revised:2023-04-25 Online:2023-05-15 Published:2023-06-01

摘要/Abstract

摘要： 本文研究了不同种类的含硫酸盐固废对硅酸盐水泥水化的影响,测试了含硫酸盐固废水泥力学性能、凝结时间、线性膨胀率随SO₃含量变化的规律,采用化学结合水、XRD和SEM等测试手段揭示了不同含硫酸盐固废对硅酸盐水泥水化的影响机理。结果表明,随SO₃含量增加,含硫酸盐固废水泥胶砂抗折强度和抗压强度均先增大后减小,初凝时间和终凝时间均呈增加趋势并在SO₃含量达到一定值后增加速度放缓,线性膨胀率均不断增大。由于不同的含硫酸盐固废的硫酸盐存在形式不同,硫酸盐溶出的速率也有差别,与水泥中铝酸三钙反应生成钙矾石(或单硫型水化硫铝酸钙)的速率和数量也不同,相同龄期下的水化程度也不同,因此不同的含硫酸盐固废对水泥力学性能、凝结时间和线性膨胀率等性能的影响存在一定差异。

关键词: 含硫酸盐固废, 钙矾石, 单硫型水化硫铝酸钙, 力学性能, 凝结时间, 线性膨胀率, 水化机理

Abstract: In this paper, the effects of different kinds of sulfate-containing solid wastes on the hydration of Portland cement were studied. The mechanical properties, setting time and linear expansion rate of cement mixed with different kinds of sulfate-containing solid wastes were tested with the change of SO₃ content. The influence mechanism of different sulfate-containing solid wastes on the hydration of Portland cement was revealed by means of chemical bound water, XRD and SEM. The results show that with the increase of SO₃ content, the flexural strength and compressive strength of cement mortar containing sulfate solid waste increase first and then decrease. The initial setting time and final setting time show an increasing trend, and the increase rate slows down after the SO₃ content reaching a certain value. The linear expansion rate continues to increase. The linear expansion rate of cement mixed with various kinds of sulfate-containing solid wastes shows an increasing trend. Due to the different forms of sulfate in different sulfate-containing solid wastes, the dissolution rate of different types of sulfate is also different. The rate and quantity of ettringite (or monosulfoaluminate hydrated) formed by the reaction with tricalcium aluminate in cement are also different, and the degree of hydration at the same age is also different. Therefore, different sulfate-containing solid wastes have different effects on the mechanical properties, setting time and linear expansion rate of cement.

Key words: sulfate-containing solid waste, ettringite, monosulfoaluminate hydrate, mechanical property, setting time, linear expansion rate, hydration mechanism

中图分类号:

TU525

杜新宇, 陈潇, 周明凯, 张浩宇, 杨寅, 王瑜德. 含硫酸盐类固废对硅酸盐水泥水化影响研究[J]. 硅酸盐通报, 2023, 42(5): 1710-1720.

DU Xinyu, CHEN Xiao, ZHOU Mingkai, ZHANG Haoyu, YANG Yin, WANG Yude. Effects of Sulfate-Containing Solid Wastes on Hydration of Portland Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(5): 1710-1720.

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含硫酸盐类固废对硅酸盐水泥水化影响研究

Effects of Sulfate-Containing Solid Wastes on Hydration of Portland Cement

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