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(C_(3)A)为铝源,Na_(2)SO_(4)溶液为侵蚀介质,采用单矿硅酸三钙(C_(3)S)制备水泥浆体,通过XRD、FTIR、SEM/EDS等测试技术表征不同SO_(4)^(2-)与C_(3)A摩尔比(S/Al比)对单矿C_(3)S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。
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(C_(3)A),erosion medium Na_(2)SO_(4)solution and monomineral tricalcium silicate(C_(3)S)were used to prepare the cement paste.XRD,FTIR and SEM/EDS were used to characterize the effects of different molar ratios of SO_(4)^(2-)toC_(3)A(S/Al ratios)on the formation of thaumasite in monomineral C_(3)S 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.
作者
李相国
田博
何超
吕阳
蹇守卫
姜东兵
张乘
周阳
LI Xiangguo;TIAN Bo;HE Chao;LYU Yang;JIAN Shouwei;JIANG Dongbing;ZHANG Cheng;ZHOU Yang(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;Huaxin Cement Co.,Ltd.,Wuhan 430070,China;College of Water and Architectural Engineering,Shihezi University,Shihezi 832000,China)
出处
《硅酸盐通报》
CAS
北大核心
2022年第8期2637-2643,共7页
Bulletin of the Chinese Ceramic Society
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;通信作者:吕阳,博士,研究员。E-mail:yang.lv@whut.edu.cn。
