MICROSTRUCTURAL ANALYSIS OF 1.4nm TOBERMORITE AND C-S-H WITH EQUIVARIANT DIFFERENTIAL HEAT OF WATER ADSORPTION IN THE LOW RELATIVE PRESSURE REGION

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  • SAITO Tsuyoshi
    NIIGATA UNIVERSITY, Faculty of Engineering（8050, Ikarashi Nino-cho, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan）
  • SUZUKI Kazuho
    NIIGATA UNIVERSITY, Graduate School of Science and Technology（8050, Ikarashi Nino-cho, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan）
  • MATSUI Kunio
    ASAHIKASEI HOMES（2-1, Sameshima, Fuji-shi, Shizuoka 416-0934, Japan）
  • SAEKI Tatsuhiko
    NIIGATA UNIVERSITY, Faculty of Engineering（8050, Ikarashi Nino-cho, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan）

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  • 低相対圧領域における等量微分吸着熱を用いた1.4nmトバモライトおよびC-S-Hのミクロ構造分析

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<p>In this study, the interlayer structure was evaluated by obtaining the water vapor adsorption isotherms from low relative pressure and the isotopic differential heat of adsorption calculated by the Clausius-Clapeyron equation for heat treated 1.4nm tobermolite, which was changed to 1.1nm, without Si-Q3 bond. The low crystallinity C-S-H was also evaluated using 1.4nm tobermorite with heat treatment as a comparison. As a result, characteristic bimodal peaks appeared in the heat of adsorption change in the low humidity range, and the behavior up to the first and second peaks were attributed to adsorption in the interlayer and on the outer surface of the interlayer, respectively. Also, the increase of the first peak in the heat of adsorption of 1.4nm tobermorite was attributed to the hydration of Ca2＋ ions bridging the interlayer.</p>

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