4.7 Article

Hydration evolution of MgO-SiO2 slurries in the presence of sodium metasilicate

期刊

CERAMICS INTERNATIONAL
卷 44, 期 6, 页码 6626-6633

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.01.070

关键词

Magnesium-silicate-hydrate; Reaction process; Morphology; Curing time

资金

  1. National Natural Science Foundation of China [51602233, 51574186]

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In order to accelerate the formation of magnesium-silicate-hydrate gel (M-S-H), the sodium metasilicate was added into the MgO-SiO2 slurries. The effect of sodium metasilicate on the hydration process of MgO-SiO2 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 flowerlike and stacked sheet-like M-S-H formed in the presence of sodium metasilicate.

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