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Crystallization of the liquid phase developed during clinkering

โœ Scribed by K.S. Han; F.P. Glasser

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

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โœฆ Synopsis

The crystallization of melts prepared in the laboratory but similar in composition to those developed during the firing of Portland cement clinkers has been studied by static and dynamic techniques. These liquids typically contain ~ 6% Si02 and ~ 22% A~203 by weight. They have sufficient glass-forming tendencies to permit quenching ea I0 g batches to glass but with slower cooling, partial or complete crystallization occurs at undercoolings up to ~ 600ยฐC.

Lowtemperature crystallization occurs in stages: the first recognizable crystalline product of undercooled melts and glasses containing 1 -3% Na20 is proto-C3A.

The latter appears to occur in both cubic and orthorhombic modifications.

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Crystallization of a liquid similar to that present in Portland cement at clinkering temperatures has been studied. Its composition (in wt %) is CaO = 54.8, A~203 = 22.7, Fez03 = 16.5, Si02 = 6.0. Prolonged crystallization or slow cooling yields the equilibrium phases: C3A, ferrite close to C,AF, an

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