✦ LIBER ✦

Mechanism of glass formation in portland cement clinker

✍ Scribed by Iwao Maki

Publisher: Elsevier Science
Year: 1979
Tongue: English
Weight: 432 KB
Volume: 9
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(79)90071-1

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✦ Synopsis

In the system C3A-C~AF-SiO2-MgO, the glass formation region that is closely similar in composition to the interstitial material of portland cement clinker has been determined. The interstitial melt that exists in equilibrium with the silicates at the clinkering temperature contains a little silica. This forms clusters, which increase the viscosity of the melt and cause the latter to supercool appreciably. Crystallization of C3A and C~AF increases the concentration of clusters, which progressively inter10ck in the residual liquid, thus giving a glass on quenching. The presence of Si02 in the interstitial melt also enables the metastable formation of the orthorhombic aluminate and the oriented overgrowth of the £errite on the aluminate to occur through encouraging supercooling 0£ the melt.

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