Reaction products of MgO and microsilica cementitious materials at different temperatures

Jiangxiong Wei; Qijun Yu; Wensheng Zhang; Hongtao Zhang

doi:10.1007/s11595-011-0304-3

Journal of Wuhan University of Technology Materials Science Edition ›› 2011, Vol. 26 ›› Issue (4) : 745 -748. DOI: 10.1007/s11595-011-0304-3

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Reaction products of MgO and microsilica cementitious materials at different temperatures

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Abstract

The paste was prepared by mixing MgO, microsilica and H₂O in the presence of water reducer at different reaction ratios and temperatures, and characterized by XRD, DTA, TGA, IR, and solid-state 29Si NMR. The experimental results showed that, besides Mg(OH)₂, magnesium silicate hydrate (M-S-H) was formed at a low temperature such as 25 and 50 °C. At a high temperature of 100 °C, Mg(OH)₂ can be further transformed into M-S-H completely, for instance, within ca. 1 month in an excess of microsilica. The average composition and structure of M-S-H was mainly related to the reaction mixture and curing temperature and was discussed in detail.

Keywords

MgO / microsilica / magnesium silicate hydrate (M-S-H)

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Jiangxiong Wei, Qijun Yu, Wensheng Zhang, Hongtao Zhang. Reaction products of MgO and microsilica cementitious materials at different temperatures. Journal of Wuhan University of Technology Materials Science Edition, 2011, 26(4): 745-748 DOI:10.1007/s11595-011-0304-3

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