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Crystallization of the molten phase in portland cement clinker

✍ Scribed by R.M. Herath Banda; F.P. Glasser

Publisher: Elsevier Science
Year: 1978
Tongue: English
Weight: 324 KB
Volume: 8
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(78)90074-1

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✦ Synopsis

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, and CzS. With more rapid cooling or with static crystallization at lower temperatures, metastable phases form. The most importantois a hitherto-unreported cubic polymorph of C3A having a o ~ 3.9 A. It is designated 'proto-C3A' to distinguish it from ordinary cubic C3A.

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