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The interaction of magnesium in hydration of C3S and CSH formation using Si-29 MAS-NMR

机译:Si-29 MAS-NMR分析镁在C3S水合和CSH形成中的相互作用

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Hydration of tricalcium silicate in hydrothermal conditions in the presence of magnesium oxide has shown changes in the formation of CSH gel structure (Calcium silicate hydrates). The new CSH incorporates magnesium ions, brucite, but a weak presence of portlandite. The magnesium oxide would hinder the precipitation of portlandite. The characterization of CSH gel by Si-29 MAS-NMR with various CaO/SiO2 ratios would point out that: (1) A dreierketten structure of the CSH for low CaO/SiO2 < 1, with some defects (Q(3) defect and Q(2)) in its structure is confirmed. Some magnesium ions are incorporated in the octahedral sites, in the interlayer space of the dreierketten pattern. (2) For the CSH gels with CaO/SiO2 ratios > 1, magnesium ions would be incorporated in the silicate chains of the CSH gel in a tetrahedral coordination. Although, the low MgO/CaO ratios of CSH gels indicate that the magnesium incorporation in CSH chain is low.
机译:在水热条件下在氧化镁存在下水合硅酸三钙的水合物显示CSH凝胶结构(硅酸钙水合物)的形成发生了变化。新的CSH掺入镁离子,水镁石,但很少有波特兰石。氧化镁会阻碍硅酸盐的沉淀。通过具有各种CaO / SiO2比的Si-29 MAS-NMR表征CSH凝胶将指出:(1)低CaO / SiO2 <1时CSH的dreierketten结构,具有一些缺陷(Q(3)缺陷和确认其结构中的Q(2))。在dreierketten模式的层间空间中,八面体位点掺入了一些镁离子。 (2)对于CaO / SiO2比> 1的CSH凝胶,镁离子将以四面体配位形式掺入CSH凝胶的硅酸盐链中。虽然,CSH凝胶的MgO / CaO低比率表明CSH链中的镁掺入量很低。

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