水熱条件下でのケイ酸ニカルシウム水和物の安定性と相関係

概要

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In the system of CaO-SiO_2-H_2O, there are three crystalline compounds with calcium/silicon ratio of 2.0, α-dicalcium silicate hydrate (α-C_2SH), hillebrandite, and dellaite. In this paper, these three compounds were synthesized and their stability and phase transformation were investigated under hydrothermal conditions up to 400℃. Hydrothermal treatments of α-C_2SH indicated that Ca-rich jaffeite (C/S=3.0) and reinhardbraunsite (C/S=2.5) were formed as intermediate phases before complete transformation to dellaite at 350℃ for 1d. The phase transformation from α-C_2SH to hillebrandite was not observed. On the other hand, a reversible phase transformation from dellaite to hillebrandite was observed at low temperatures below 300℃ with formation of a small amount of the C-S-H compounds with C/S ratio of 1.5. The fact that α-C_2SH was not formed form dellaite suggests that α-C_2SH is a metastable phase.
社団法人日本セラミックス協会の論文
2006-02-01