^<29>Si NMRによるジャイロライトの水熱合成過程におけるケイ酸イオンの挙動

概要

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Using lime and amorphous silica as the starting materials, gyrolite(Ca_8(Si_<12>O_<30>)(OH)_4・7H_2O)was prepared hydrothyermally with the Ca/Si molar ratio of 0.66 and 0.50 at 200℃ for 0.5-128h. The formation process was studied mainly by ^<29>Si NMR. The initially formed C-S-H consisted mainly of long chains of silicate anions. For Ca/Si=0.66, the chain which had been formed was broken, and C-S-H changed into gyrolite and xonotlite. For Ca/Si=0.50, only gyrolite was formed from a long chain of the silicate anions. It is thought that the differences of the C-S-H structures, which were formed in the initial stage, greatly influenced the final products. In addition, for, Ca/Si=0.50, the Z-phase was also formed as a precursor of gyrolite and its silicate anion structure was similar to that of the gyrolite.
社団法人日本セラミックス協会の論文
1995-02-01