Influence of [Si(Al)O₄] Polymerization Degree on Solidification of Na⁺

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 SiQ0 and SiQ1,it depolymerized in the early stage of hydration process,and then reacted with Ca2+ in the solution to form high Ca/Si C-S-H gel.When Si existed in the form of SiQ2 and SiQ3,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+.