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Variation in the Composition of C‐S‐H Gel in Portland Cement Pastes Cured at Various Temperatures
Author(s) -
EscalanteGarcia José Ivan,
Sharp John H.
Publication year - 1999
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.1151-2916.1999.tb02230.x
Subject(s) - portland cement , curing (chemistry) , cement , materials science , scanning electron microscope , isothermal process , chemical composition , sulfate , energy dispersive x ray spectroscopy , composite material , analytical chemistry (journal) , nuclear chemistry , chemical engineering , mineralogy , chemistry , metallurgy , chromatography , organic chemistry , physics , engineering , thermodynamics
Variation in the composition of C‐S‐H gel, the main hydration product of portland cement, cured at various temperatures, was studied using scanning electron microscopy with energy dispersive X‐ray spectroscopy. Samples of two cement pastes were cured isothermally under water at 10°, 30°, and 60°C for one year. For the inner‐product C‐S‐H gel of both cement pastes, increased curing temperature decreased the Ca/Si and Al/Ca ratios, but increased the S/Ca ratio. The Al/S and (Al + Fe)/S ratios decreased with increased curing temperature. Sulfur, probably in the form of sulfate ions, could be sorbed by the C‐S‐H gel at higher temperatures.