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Studies of Early Stages of Paste Hydration of Cement Compounds, II
Author(s) -
CHATTERJI S.,
JEFFERY J. W.
Publication year - 1963
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.1151-2916.1963.tb11713.x
Subject(s) - ettringite , gypsum , aluminate , alite , alkali metal , phase (matter) , materials science , portlandite , foil method , boehmite , chemistry , chemical engineering , mineralogy , inorganic chemistry , cement , metallurgy , portland cement , aluminium , composite material , organic chemistry , clinker (cement) , engineering
The paste hydration of mixtures of alite, C 3 A, and C 4 AF with and without gypsum and/or NaOH was studied by electron‐optical and X‐ray diffraction techniques. In the absence of both gypsum and NaOH, a foil‐like reaction product and hexagonal calcium aluminate hydrates were formed first. Any CO 2 , present formed calcium carboaluminate. With time the foils changed to splines of CSH, and hexagonal aluminate hydrates changed to cubic C 3 AH 6 . When no gypsum was present, NaOH solution retarded the formation of hexagonal aluminates at the very early stages of hydration; it did not have much effect on the later hydration processes. With gypsum but without alkali, a foil‐like product and ettringite formed first. Later the foils changed to splines of CSH and ettringite to monosulfate. Alkali, in the presence of gypsum, hastened the formation of splines of CSH. The results suggest that the hydration of alite, even after 14 days, goes through the solution phase.