Hydrothermal solidification of CaCO3

Makoto Kotama, Takeyuki Yamamoto, Osamu Watanabe, Hideki Ishida

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The possibility of the solidification of CaCO3 with saving energy consumption was discussed in the system CaCO3-CaO-SiO2 (88.2 :1.8 : 10.0 mass%). Two kinds of bodies - "calcination system" where CaO was supplied from partially calcined CaCO3 at 800°C for 3h and "addition system" where CaO was added - were prepared and hydrothermally processed under the saturated vapor pressure at 150-200°C for 2-10h. In the calcination system, flexural strength of the body cured at 150°C for 10h or at 200°C for 5h showed 9 MPa which was three times higher than that in the addition system. The strength was controlled by the formed fibrous or lath-like C-S-H gels and C-S-H gels in the calcination system gave larger volume and more uniform distribution than in the addition system. Some parts of C-S-H gels were formed from CaCO3 and 13% of CaCO3 was observed to react in the calcination system at 150°C for 10h or at 200°C for 5h curing.

Original languageEnglish
Pages (from-to)660-663
Number of pages4
JournalJournal of the Ceramic Society of Japan
Issue number8
Publication statusPublished - 1997 Aug
Externally publishedYes


  • C-S-H gel
  • CaCO
  • Calcination
  • Flexural strength
  • Hydrothermal solidification

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry


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