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Studies of Early Stages of Paste Hydration of Cement Compounds, I
Author(s) -
CHATTERJI S.,
JEFFERY J. W.
Publication year - 1962
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.1151-2916.1962.tb11053.x
Subject(s) - ettringite , lime , gypsum , hydrate , aluminate , cement , chemistry , mineralogy , reactivity (psychology) , materials science , inorganic chemistry , chemical engineering , metallurgy , portland cement , organic chemistry , medicine , alternative medicine , pathology , engineering
The paste hydration of C 4 AF with and without the addition of lime and/or gypsum was studied by means of electron‐optical and X‐ray diffraction techniques. It was found that in the paste hydration of C 4 AF iron did not separate out but remained in the structure of the hydrated compounds, probably substituting for aluminum. In a neat paste of C 4 AF and H 2 O, at first di‐ and tetracalcium aluminate hydrate crystals formed, but later cubic C 3 AH 6 crystals appeared. In the presence of Ca(OH) 2 , C 2 AH x crystals did not form; otherwise the course of the reaction was the same as without lime. Any CO 2 present formed monocarboaluminate. When gypsum alone was present, ettringite crystals first appeared which later changed to monosulfate hydrate. In the presence of both lime and gypsum, the reactivity of C 4 AF was much reduced. Ettringite crystals were somewhat stabilized by lime. The formation of monocarboaluminate was hindered in the presence of gypsum.