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Chemical Composition of C‐S‐H Gel Formed in the Hydration of Calcium Silicate Pastes
Author(s) -
BENTUR AR,
BERGER R. L.
Publication year - 1979
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.1151-2916.1979.tb19033.x
Subject(s) - chemical composition , extraction (chemistry) , chemistry , calcium silicate , silicate , adsorption , mineralogy , composition (language) , analytical chemistry (journal) , thermal analysis , x ray crystallography , nuclear chemistry , diffraction , materials science , chromatography , thermal , organic chemistry , linguistics , philosophy , composite material , physics , meteorology , optics
The chemical and physical compositions of C‐S‐H formed in paste hydration of C 3 S cured at 4°, 25°, and 65°C and of C 2 S and a C 3 S/C 2 S blend cured at 25°C were studied using quantitative X‐ray diffraction analysis (QXDA), extraction, and thermal effluent gas analysis (TEGA) to determine the free CH content. The amount of CH determined by extraction is greater than or equal to that determined by QXDA. The difference between the two results increased with the H 2 O surface area of the paste, indicating the existence of adsorbed CH in the form of Ca 2+ and (OH) − ions which cannot be measured by QXDA and suggesting that the extraction method is better for estimating the composition of C‐S‐H.