８０‐１００°Ｃにおけるシラス‐石灰系水熱反応

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タイトル別名
  • Hydrothermal Reaction of Volcanic Ash (Shirasu) with Lime at 80° and 100°C
  • 80 100ドC ニ オケル シラスー セッカイケイ スイネツ ハンノウ

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Hydrothermal reactivities of shirasu, i.e. a volcanic ash rich in glassy part and deposited abundantly in South Kyushu, with lime were studied at 80° and 100°C.<br>Glassy part of shirasu (Ig. loss 2.7, SiO2 74.3, Al2O3 12.7, Na2O 4.4, K2O 3.0, others 3.0%; 5950cm2/g) was mixed with CaO and water. The ratios by weight were as follows; Ca/Si: 0.6-0.8, water/solid: 20. Then the mixtures were kept at 80° and 100°C for various periods of time.<br>By the reaction for more than 20 days at 80°C, 10Å tobermorite formed. The crystals were lath-like or fibrous elongated parallel to b axis with (100) cleavage. In the SED pattern of the crystal lying on (100) cleavage, diffraction spots were indexed to 0 kl when k and l were even, but when k was odd reflections were continuous streaks parallel to c* due to disorder. The 10Å tobermorite deteriorated to an amorphous form on heating to 300°C, and β-CaSiO3 formed at 800°C. Observed similarities of 10Å tobermorite to C-S-H (II) suggested that the former might be a well crystalline form of the latter.<br>By the reaction for more than 30-40 days at 80°C or for more than 6 days at 100°C, Albearing 11Å tobermorite having a basal spacing of 11.8Å was obtained. The crystals were platy elongated parallel to b axis with (001) cleavage. The 11Å tobermorite proved to be an anomalous type since it kept the crystal structure of 11Å tobermorite until converted to β-CaSiO3 on heating at 800°-900°C.<br>Besides, a small quantity of hydrogarnet [Ca3Al2(SiO4)(O4H4)2] formed at both temperatures.

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  • 窯業協會誌

    窯業協會誌 87 (1002), 86-94, 1979

    公益社団法人 日本セラミックス協会

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