摘要
研究了早期高湿度空气养护、水中标准养护及密封养护对水泥石碳硫硅钙石型硫酸盐腐蚀的影响。采用X射线衍射(XRD)、傅立叶转换红外光谱(FTIR)和扫描电子显微镜(SEM)等方法分析了水泥石经180 d硫酸盐侵蚀后的腐蚀产物。结果表明,早期高湿度空气养护,水泥石碳化生成的CaCO3填充于孔隙中,使表层结构更加致密,阻碍了SO42-等有害离子侵入,延缓了水泥石碳硫硅钙石型硫酸盐腐蚀过程。比较而言,早期密封养护,水泥水化不充分,水泥石内部缺陷相对较多,SO42-等有害离子容易侵入,水泥石碳硫硅钙石型硫酸盐腐蚀最为严重。
The effects of initial high humid air-curing,standard water-curing and sealed-curing on thaumasite form of sulfate attack（TSA） of cement-based materials were studied.The Erosion products after 180 days attack in sulfate solution were analyzed by the way of X-ray diffraction（XRD） and fourier transform infrared spectroscopy（FTIR）.And it was found that the TSA of the cement stone was delayed in high humid air resulting from that CaCO3 generated from carbonation was filled in the pores of the specimens,forming a compacted surface and restricting SO42-intrusion.In comparison,the extent of TSA of the specimens cured in sealed condition was most severe resulting from that large amount of inter-defects in specimens for the lower hydration degree,and SO42-ions could intrude into specimens more easily.
出处
《土木建筑与环境工程》
CSCD
北大核心
2010年第2期135-139,共5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)
关键词
早期养护
水泥
碳硫硅钙石
硫酸盐腐蚀
initial curing condition
cement
thaumasite
sulfate attack
