Ca(OH)_2溶液中におけるSiO_2の反応挙動(第2報) : SiO_2ガラスとCa(OH)_2溶液の場合

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Reaction behavior of Ca(OH)_2-SiO_2 system at 75℃ was investigated using silica glass plate as an SiO_2 sample by SEM observation, XPS analysis and quantitative analysis of Si and Ca of the reaction products. Reaction of silica glass with Ca^<2+> at 75℃, which leads to the formation of calcium silicate hydrate C-S-H, was found to proceed in three stages ; (1)At the first stage the whole glass surface was covered with the layer containing Ca^<2+> ion. (2)At the second stage crystalline C-S-H was formed by the reaction between Ca^<2+> and silica glass surface, and glass surface was exposed. (3)At the third stage the reaction with Ca^<2+> proceeded at the SiO_2 surface, and increases the amount of C-S-H. When the reaction product on silica glass surface at the beginning of the reaction was assumed to be amorphous C-S-H, the ratio of Ca/Si in the product was infinity at first, decreased as the crystal growth of C-S-H proceeded, and finally reduced to be constant. The final ratio of Ca/Si depends on the solution pH. In the solution of pH=10.7 the ratio of Ca/Si of crystalline C-S-H became 1.2.
社団法人日本セラミックス協会の論文
1995-02-01