Ca(OH)_2溶液中におけるSiO_2の反応挙動(第1報)

概要

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Reaction behavior of a Ca(OH)_2 SiO_2 system at 75℃ was investigated by the potentiometric titration method. The results of changes in solution pH after reaction and Ca^<2+> ion concentration indicated that the reaction behavior in this system was classified into three regions. Reaction products obtained in the three regions were identified using X-ray diffraction and ob served with a scanning electron microscope. In region I , no changes in solution pH and Ca^<2+> ion concentra tion before and after reaction were observed without the appearance of any crystalline phase. Hence, the reaction between Ca^<2+> ion and Si0_2 powder does not oc cur in this region. In region II, although the C S H were not observed by XRD, the amount of reacted Ca^<2+> ion with SiO_2 powder gradually increased with an in crease in Ca (OH)_2 concentration in initial solution. This result shows that the reaction between Ca^<2+> ion and Si02 powder occurred. In region III , changes in the amount of consumed Ca^<2+> ion before and after reaction increased linearly with an increase in Ca (OH)_2 concen tration in initial solution. In this region, C S H was confirmed and pH values were constant after reaction, which appeared as a pH plateau on the titration curve, regardless of the initial solution pH.
社団法人日本セラミックス協会の論文
1994-11-01