CHARACTERIZATION OF C-A-S-H GEL FORMED IN C-A-S-H/N-A-S-H GEL BLENDS

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  • KAMIMURA Koya
    NIIGATA UNIVERSITY, Graduate School of Science and Technology（8050, Ikarashi, Nino-cho, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan）
  • 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）
  • SAEKI Tatsuhiko
    NIIGATA UNIVERSITY, Faculty of Engineering（8050, Ikarashi, Nino-cho, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan）

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Other Title
  • C-A-S-Hとゼオライトの混相中におけるC-A-S-H生成領域の評価

Abstract

<p>This paper reports on the phase transformation of C-A-S-H/N-A-S-H blends and the structural characterization of C-A-S-H and zeolites formed in this process. C-A-S-H/N-A-S-H blend gels were prepared with different Si/Al and Ca/Si ratios and characterized by X-ray diffraction （XRD）, fourier transform infrared spectroscopy （FT-IR） and magic angle spinning nuclear magnetic resonance （MAS NMR）. The results showed that when the Al content in the blend gels was high, zeolite with a high Si/Al composition ratio is formed, and when Ca is added, C-A-S-H is formed immediately after gel mixing, but then the zeolite phase is gradually formed. On the other hand, when Al content in the blend gel was low, C-A-S-H became the main phase even with a small addition of Ca. Furthermore, FT-IR spectra may provide insight into the formation behavior of C-A-S-H and the relationship between the Ca/Si ratio and the amount of Al in solid solution in C-A-S-H.</p>

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