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Crystal Chemistry and Reactivity of the MgO‐Stabilized Alites
Author(s) -
THOMPSON R. A.,
KILLOH D. C.,
FORRESTER J. A.
Publication year - 1975
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.1151-2916.1975.tb18984.x
Subject(s) - triclinic crystal system , monoclinic crystal system , reactivity (psychology) , chemistry , crystallography , annealing (glass) , crystal chemistry , x ray crystallography , crystal structure , mineralogy , analytical chemistry (journal) , diffraction , materials science , organic chemistry , metallurgy , medicine , alternative medicine , physics , pathology , optics
The reactivity with water of 3CaO· SiO 2 stabilized in the tri‐clinic and monoclinic forms with MgO was studied by monitoring the heat of hydration using conduction calorimetry. The early heats of hydration increase moderately when the MgO content brings the sample near the monoclinic‐triclinic transition point. Reactivity increases markedly when samples with high MgO contents are annealed. Annealing appears to cause separation of some of the MgO and also eventually converts monoclinic samples to the triclinic form. Samples containing < 0.9% MgO showed a slight reduction in reactivity after they were annealed, but pure 3CaO· SiO 2 was unaffected. Preparation of the samples and their examination by X‐ray diffraction and chemical extraction methods are described. Possible explanations for the hydration behavior are discussed.