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Structural Degradation of Tobermorite during Vibratory Milling
Author(s) -
Sasaki Kaori,
Masuda Tsuguya,
Ishida Hideki,
Mitsuda Takeshi
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08766.x
Subject(s) - tobermorite , wollastonite , materials science , chemical engineering , amorphous solid , decomposition , grinding , crystallography , phase (matter) , mineralogy , chemistry , composite material , organic chemistry , cement , raw material , engineering
Mechanochemistry of hydrothermally prepared Al‐free and Al‐substituted 1.1 nm tobermorite was studied using 29 Si 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.