摘要
运用核磁共振分析手段(NMR),采用结构分析的方法研究了赤泥基胶凝材料的水化过程,探讨了[Si(Al)O4]四面体聚合度对Na+固化性能的影响。结果表明:当原料中硅以SiQ0、SiQ1等低聚合度形式存在时,由于低聚合度的[Si(Al)O4]四面体易在早期发生解聚,并在富含Ca2+的溶液中发生反应生成钙硅比较高的C-S-H凝胶,这不利于Na+的固化;当硅主要以SiQ2、SiQ3等中聚合度形式存在时,由于水化后期[Si(Al)O4]四面体的逐渐解聚和铝对硅的取代作用,促进了低钙硅比的(Na,Al)-C-S-H凝胶的生成,改善了Na+的固化性能;而在硅主要以SiQ4高聚合度形式存在时,又不利于Na+固化。
Using structural analysis methods, the hydration process of cementitious materials and the effect mechanism of the polymerization degree of [Si（Al）O4] on the solidification of Na^＋ during hydration process were studied. The results indicate that the [Si（Al）O4] polymerization degree in raw materials had a remarkable influence on the solidification of Na^＋. When Si existed in the form of SiQ^0 and SiQ^1 , it depolymerized in the early stage of hydration process, and then reacted with Ca^2＋ in the solution to form high Ca/Si C-S-H gel. When Si existed in the form of SiQ^2 and SiQ^3, it was depolymerized mainly in the late stage of hydration process, then Al readily entered the [Si（Al）O4] tetrahedral sites and made the hydration into low Ca/Si （Na,Al）-C-S-H gel, which was more useful for the solidification of Na^＋. When Si existed in the form of SiQ4, it was not useful for the solidification of Na^＋.
出处
《机械工程材料》
CAS
CSCD
北大核心
2009年第6期40-44,共5页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(50674062)
关键词
赤泥
固化
取代
煤矸石
red mud
solidification
substitution
gangue
