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Effect of Silicate Anion Structure on Fixation of Chloride Ions by Calcium Silicate Hydrates
Author(s) -
Koizumi Koshiro,
Tsuyuki Naomitsu
Publication year - 2004
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.1551-2916.2004.00412.x
Subject(s) - silicate , chloride , calcium silicate , calcium , chemistry , inorganic chemistry , ion , mineralogy , materials science , organic chemistry , composite material
Calcium silicate hydrates, CaO–SiO 2 ‐H 2 O (C‐S‐H), were studied as a chloride fixation material. C‐S‐H of two different CaO/SiO 2 ratios were synthesized and burned with calcium chloride in a temperature range from 600° to 1000°C. Minerals with a chemical composition of CaO·SiO 2 ·CaCl 2 and 9CaO·6SiO 2 ·CaCl 2 were identified by X‐ray diffraction analysis. Comparing the diffraction intensity, it was found that the most efficient chloride fixation was attained when burned at 800°C. Changes in the morphology of silicate anion associated with burning and fixation of the chloride were studied in terms of chloride fixation capability using the trimethylsililation technique. It was confirmed that some silicate anions formed a glassy infinite chain where the chloride ions were fixed as a solid solution.