Reaction Products of MgO and Microsilica Cementitious Materials at Different Temperatures

• 作 者: 韦江雄
• 机 构: School of Materials Science and Engineering, South China University of Technology,
• 出 处: Journal of Wuhan University of Technology(Materials Science
• 发表日期: 2011年04期
• 关键词: paste magnesium instance curing transformed hydrate mixing hydration silicate cu

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 ℃. At a high temperature of 100 ℃, 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.

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 (MSH) 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 MSH completely, for instance, within ca . 1 month in an excess of microsilica. The average composition and structure of MSH was mainly related to the reaction mixture and curing temperature and was discussed in detail.