Unequivocal phase identification of alite in portland cement clinker has been made by combined use of microscopy during heating, X-ray powder diffraction, and differential thermal analysis. Alite thus far assigned to Mlb by X-ray powder diffractometry, in reality, gives every indication of being M
Redistribution of impurity during recrystallization of alite in portland cement clinker
β Scribed by I. Maki; S. Takahashi
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 329 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0008-8846
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In the examination of alite in Portland cement clinker by transmission electron microscopy, the dominant structure found was that described by Jeffery (I). Twinning on the pseudomirror plane of the monoclinic structure has been found. This provides an explanation for some weak extra X-ray reflection
The phase constitution of alite in portland cement clinker highly depends not only on the chemical composition of a raw mix but also on the kinetics of crystallization from the interstitial melt. From the melt of high supersaturation alite can be crystallized so quickly as to take up foreign ions i
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.