摘要
利用DTA,XRD,IR测定水泥水化浆体的化学结合水和Ca(OH)2的生成量,研究了煅烧石膏、二承石膏对硅酸盐水泥早期水化过程的影响。结果表明:在水化龄期相同时,掺煅烧石膏水泥浆体中水化产物同掺二水石膏相比,Ca(OH)2生成量大;在1 d前无钙钒石(AFt)生成;结合水量在1 d前,前者高于后者,而1 d后则相反。指出了煅烧石膏加快水泥早期水化产物形成的机理在于:由于它的溶解度较低,在水泥水化初期(1 d前),存在于水泥中的铝酸盐相不能形成AFt,从而减缓了AFt对水泥水化的延缓作用,加速了整个熟料矿物相的水化。
Effects of gypsum and calcined gypsum on the early hydration of portland cement were investigated by means of DTA, XRD, IR, and chemically combined water and Ca(OH)2 content. Results show that the cement pastes with calcined gypsum had more Ca(OH)2, less chemically combined water and no ettringite in the first day of hydration in comparison with the cement pastes with gypsum. The research indicates that calcined gypsum instead of gypsum accelerated the formation of early hydration products because the aluminate containing phases in clinker can not hydrate to form ettringite during the first day due to the low dissolution rate of calcined gypsum.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2002年第6期675-680,共6页
Journal of The Chinese Ceramic Society
基金
江苏省教委自然科学基金资助项目(JW970039)。
