Formation processes of β-C2S by the decomposition of hydrothermally prepared C-S-H with Ca(OH)2

Yoshihiko Okada, Kaori Sasaki, Baiqian Zhong, Hideki Ishida, Takeshi Mitsuda

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26 Citations (Scopus)


A mixture of CaO and silicic acid prepared with a Ca/Si ratio of 2.0 was hydrothermally synthesized at 80° to 200 °C, and the thermal decomposition behavior of the products (C-S-H with Ca(OH)2) was analyzed using XRD, 29Si MAS NMR, and the trimethylsililation method (TMS). It was found that the main silicate anion structure of C-S-H was a mixture of a dimer and a single-chain polymer (larger than Si5O16) and that polymerization advanced with an increase of the synthesizing temperature. On heating, the products decomposed to form β-C2S. It was found that the decomposition was gradual and that the higher the temperature of hydrothermal synthesis, the lower was the temperature of the decomposition into β-C2S. Although the decomposition proceeded to form a monomer (β-C2S) from the polymer and dimer, this dimer was resistant to heat and did not decompose unless heated to above 400 °C.

Original languageEnglish
Pages (from-to)1319-1323
Number of pages5
JournalJournal of the American Ceramic Society
Issue number5
Publication statusPublished - 1994 May

ASJC Scopus subject areas

  • Ceramics and Composites

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