Characterization of C-S-H from highly reactive β-dicalcium silicate prepared from hillebrandite

Yoshihiko Okada, Hideki Ishida, Kaori Sasaki, J. Francis Young, Takeshi Mitsuda

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22 Citations (Scopus)

Abstract

β-dicalcium silicate synthesized by thermal dissociation of hydrothermally prepared hillebrandite (Ca2(SiO3)(OH)2) exhibits extremely high hydration activity. Characterization of the hydrates obtained and investigation of the hydration mechanism was carried out with the aid of trimethylsilylation analysis, 29Si magic angle spinning nuclear magnetic resonance, transmission electron microscopy selected area electron diffraction, and XRD. The silicate anion structure of C-S-H consisted mainly of a dimer and a single-chain polymer. Polymerization advances with increasing curing temperature and curing time. The C-S-H has an oriented fibrous structure and exhibits a 0.73-nm dreierketten in the longitudinal direction. On heating, the C-S-H dissociates to form β-C2S. The temperature at which β-C2S begins to form decreases with increasing chain length of the C-S-H or as the Ca/Si ratio becomes higher. The high activity of β-C2S is due to its large specific surface area and the fact that the hydration is chemical-reaction-rate-controlled until its completion. As a result, the hydration progresses in situ and C-S-H with a high Ca/Si ratio is formed.

Original languageEnglish
Pages (from-to)1313-1318
Number of pages6
JournalJournal of the American Ceramic Society
Volume77
Issue number5
Publication statusPublished - 1994 May

ASJC Scopus subject areas

  • Ceramics and Composites

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