Abstract In order to accelerate the formation of magnesium-silicate-hydrate gel (M-S-H), the sodium metasilicate was added into the MgO-SiO 2 slurries. The effect of sodium metasilicate on the hydration process of MgO-SiO 2 slurries was investigated in this work. It required a relatively small amount of sodium metasilicate to facilitate the formation of M-S-H and to surpress the brucite formation. In the early 24 h, the M-S-H formed quickly due to the high concentration of magnesium ions and silicate species in solutions. With the further increasing of curing time, the M-S-H gel phase continuously grew. Furthermore, the sufficient silicate ions amount was favorable for the transformation of newly formed brucite to the M-S-H phase. The addition of sodium metasilicate influenced not only the reaction process but also the morphology of hydrates. Instead of the yolk-shell structure, the flower-like and stacked sheet-like M-S-H formed in the presence of sodium metasilicate.

中文翻译：

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偏硅酸钠存在下MgO-SiO 2 浆液的水化反应

摘要 为了加速水合硅酸镁凝胶(MSH)的形成，将偏硅酸钠加入到MgO-SiO 2 浆料中。本工作研究了偏硅酸钠对MgO-SiO 2 浆料水化过程的影响。它需要相对少量的偏硅酸钠来促进 MSH 的形成并抑制水镁石的形成。在最初的 24 小时内，由于溶液中镁离子和硅酸盐物质的浓度高，MSH 迅速形成。随着固化时间的进一步增加，MSH凝胶相不断增长。此外，足够的硅酸盐离子量有利于新形成的水镁石向 MSH 相的转变。偏硅酸钠的加入不仅影响反应过程，而且影响水合物的形态。