Structural degradation of tobermorite during vibratory milling

Kaori Sasaki, Tsuguya Masuda, Hideki Ishida, Takeshi Mitsuda

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Mechanochemistry of hydrothermally prepared Al-free and Al-substituted 1.1 nm tobermorite was studied using 29Si NMR, XRD, and TGA-DTA. Tobermorite has a double-chain structure and Al/Si substitution occurs preferentially at bridging tetrahedra. By using the vibration mill, both tobermorites were observed to decompose as a function of milling time to form amorphous C-S-H-like phases. The decomposition rate was higher for the Al-substituted tobermorite. The decomposition process occurs mainly at the bridge portion of the silicate double chain. In the Al-substituted tobermorite, the breakage seems to occur preferentially at the points where Al has replaced Si. On heating the amorphous C-S-H-like phase, wollastonite is formed. However, no decrease was observed at the wollastonite formation temperature.

Original languageEnglish
Pages (from-to)1569-1574
Number of pages6
JournalJournal of the American Ceramic Society
Volume79
Issue number6
DOIs
Publication statusPublished - 1996 Jan 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

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