Hydrothermal solidification of kaolinite-quartz-lime mixtures

Hiroki Maenami, Osamu Watanabe, Hideki Ishida, Takeshi Mitsuda

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

The strength development of hydrothermally solidified kaolinite-quartz-lime systems with kaolinite as the aluminum source was studied. The starting materials were mixed so that the Ca/(Si + Al) atomic ratio was in the range 0.23 to 0.25, and the Al/(Si + Al) ratio was between 0 to 0.50. Specimens were formed by uniaxial pressing and hydrothermal treatment under saturated steam pressure at 200°C for 2 to 20 h. For quartz-rich systems with Al/(Si + Al) = 0 and 0.05, strength development by the formation of calcium silicate hydrates, such as C-S-H and tobermorite (Ca5(Si6O18H2)·(4H2O), was observed. On the other hand, in the case of kaolinite-rich systems with Al/(Si + Al) = 0.24 to 0.50, strength development by the formation of hydrogarnet (Ca3Al2(SiO4)(OH)8) was recognized, resulting in flexural strengths between 15 to 20 MPa. It is proposed that strength development is related to the formation of mesopores (approx. 0.04 μm) that accompanied formation of the hydrogarnet.

Original languageEnglish
Pages (from-to)1739-1744
Number of pages6
JournalJournal of the American Ceramic Society
Volume83
Issue number7
Publication statusPublished - 2000 Jul 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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