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Studies of the crystallization of the liquid phase in Portland clinker: Effects of MgO and Na2O

โœ Scribed by K.S. Han; F.P. Glasser; J.A. Gard

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
303 KB
Volume
10
Category
Article
ISSN
0008-8846

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โœฆ Synopsis

Devitrification of a glass containing CaO = 48.9, A~203 = 23.2, Fe203 = 14.2, Si02 = 5.71, MgO = 5.0, Na~O = 3.0 (wt %) at 650 o-700ยฐC yields large amounts of a crystalli~e phase which is rhombohedral, aH = 10.61, e H = 26.18 A.

Partially-indexed powder x-ray data are given.

The phase has the approximate composition, relative to 144 oxygens: Ca59.TNa3.sMg6.oA~29.TFe1~,~Sis.90~.

Its crystallization partially suppresses formation of CaA during devitrification. Compositional data are also given for proto-C~A formed from this glass.

The solubilities of Fe andSi in this unstable variety of CaA considerably exceed the equilibrium values.

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