SO42-/C3A对单矿C3S水泥浆体中碳硫硅钙石形成的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (8): 2637-2643.

SO₄^2-/C₃A对单矿C₃S水泥浆体中碳硫硅钙石形成的影响

李相国¹, 田博¹, 何超², 吕阳¹, 蹇守卫¹, 姜东兵¹, 张乘¹, 周阳³

1.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
2.华新水泥股份有限公司,武汉 430070;
3.石河子大学水利建筑工程学院,石河子 832000

收稿日期:2022-04-08 修回日期:2022-05-27 出版日期:2022-08-15 发布日期:2022-08-30
通讯作者: 吕阳,博士,研究员。E-mail:yang.lv@whut.edu.cn
作者简介:李相国(1976—),男,博士,研究员。主要从事水泥、工业固废等方向的研究。E-mail:lxggroup@163.com

Effect of SO₄^2-/C₃A Ratio on Formation of Thaumasite in Monomineral C₃S Cement Paste

LI Xiangguo¹, TIAN Bo¹, HE Chao², LYU Yang¹, JIAN Shouwei¹, JIANG Dongbing¹, ZHANG Cheng¹, ZHOU Yang³

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
2. Huaxin Cement Co., Ltd., Wuhan 430070, China;
3. College of Water and Architectural Engineering, Shihezi University, Shihezi 832000, China

Received:2022-04-08 Revised:2022-05-27 Online:2022-08-15 Published:2022-08-30

摘要/Abstract

摘要： 碳硫硅钙石型硫酸盐侵蚀是一种以碳硫硅钙石为生成产物的硫酸盐侵蚀,碳硫硅钙石的形成过程与水泥基材料中铝源及外界环境中硫酸盐密切相关。以铝酸三钙(C₃A)为铝源,Na₂SO₄溶液为侵蚀介质,采用单矿硅酸三钙(C₃S)制备水泥浆体,通过XRD、FTIR、SEM/EDS等测试技术表征不同SO^2-₄与C₃A摩尔比(S/Al比)对单矿C₃S水泥浆体中碳硫硅钙石形成的影响,旨在揭示碳硫硅钙石形成机理并探讨抑制其形成的方法。结果表明:当S/Al比为3时,侵蚀14个月后在侵蚀产物中依然没有检测到碳硫硅钙石;当S/Al比为6和9时,侵蚀3个月即可检测到碳硫硅钙石,这表明外部硫酸根离子浓度越高越有利于碳硫硅钙石的形成。

关键词: S/Al比, 硫酸盐侵蚀, 碳硫硅钙石, 单矿, 固相产物, 钙矾石

Abstract: Thaumasite sulfate attack (TSA) is a sulfate attack with thaumasite as the product, and the formation process of thaumasite is closely related to the aluminum source in cement-based materials and sulfate in the external environment. In this paper,aluminum source tricalcium aluminate (C₃A), erosion medium Na₂SO₄ solution and monomineral tricalcium silicate (C₃S) were used to prepare the cement paste. XRD, FTIR and SEM/EDS were used to characterize the effects of different molar ratios of SO^2-₄ to C₃A (S/Al ratios) on the formation of thaumasite in monomineral C₃S cement paste, so as to reveal the formation mechanism of thaumasite and find the methods to inhibit its formation. The results show that when the S/Al ratio is 3, there is no thaumasite detected in the erosion products after 14 months of attack. When the S/Al ratio is 6 and 9, thaumasite can be detected after 3 months, indicating that the higher external sulfate ion concentration is more beneficial for the formation of thaumasite.

Key words: S/Al ratio, sulfate attack, thaumasite, monomineral, solid product, ettringite

中图分类号:

TU528.45

李相国, 田博, 何超, 吕阳, 蹇守卫, 姜东兵, 张乘, 周阳. SO₄^2-/C₃A对单矿C₃S水泥浆体中碳硫硅钙石形成的影响[J]. 硅酸盐通报, 2022, 41(8): 2637-2643.

LI Xiangguo, TIAN Bo, HE Chao, LYU Yang, JIAN Shouwei, JIANG Dongbing, ZHANG Cheng, ZHOU Yang. Effect of SO₄^2-/C₃A Ratio on Formation of Thaumasite in Monomineral C₃S Cement Paste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2637-2643.

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SO₄^2-/C₃A对单矿C₃S水泥浆体中碳硫硅钙石形成的影响

Effect of SO₄^2-/C₃A Ratio on Formation of Thaumasite in Monomineral C₃S Cement Paste

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