Polymorphic modifications of the alites in clinkers

Maki and co-workers (M2-M6) studied the crystallization of alite by high-temperature light microscopy of thin sections together with thermal and X- 

Normal form in clinkers low in alkali and with AljOj/FejOj in the approximate range 1.0-3.0. 

Orthorhombic or pseudotetragonal forms, found in clinkers high in alkalis. Na,/K ratio varies with that of the clinker. 

Tentative composition for aluminate phase in white cement clinkers. 

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