摘要
研究了掺加化学外加剂的水泥净浆试件在（5±2）℃、质量分数5%的硫酸镁溶液中浸泡300d的外观变化、强度发展及侵蚀产物,采用X射线衍射（XRD）、傅立叶转换红外光谱（FTIR）等方法分析了侵蚀产物的组成。结果表明：甲酸钙能延缓水泥石发生TSA腐蚀,但不能阻止TSA发生,在0.3%-0.7%范围内,随着甲酸钙掺量的增加,水泥石抗TSA腐蚀的能力增强。硝酸钡能有效抑制水泥石中碳硫硅钙石的生成,原因是硝酸钡能结合生成碳硫硅钙石所需的SO42-,从而降低了水泥石发生TSA腐蚀的程度。硝酸钡掺量在1%左右时,水泥石抗TSA性能较好。
The cement paste added with chemical admixtures is kept out（5±2）℃,5% in mass MgSO4 corrosion solution in 300 d of immersion.Its visual appearance,compressive strength and erosion products are studied.Its erosion products are analyzed by the way of X-ray Diffraction（XRD） and Fourier Transform Infrared Spectroscopy（FTIR）.It shows that the calcium formate can delay the TSA of harden cement paste to occur,but can not stop the development of TSA.The resistance of mortar to TSA increases with the raise of calcium formate in the range of 0.3% to 0.7%.The reason why barium nitrate can inhibit the formation of thaumasite is that it can combine with SO2-4 which is essential for the forming of thaumasite.Thus,the TSA of mortar is reduced in degree.The harden cement paste shows good resistance to TSA when barium nitrate is approximately 1% of cement.
出处
《土木建筑与环境工程》
CSCD
北大核心
2011年第2期126-131,共6页
Journal of Civil,Architectural & Environment Engineering
基金
重庆市自然科学基金重点资助项目(CSTC2007BA7019)
