Abstract
Three sets of clinkers produced under different pyroprocessing conditions in a commercial dry-process cement kiln yielded alkalis in different combinations: one set was rich in alkali sulfate compounds, alkali-stabilized orthorhombic C 3A was predominant in the second, whereas potassium rich α-C 2S and alkali oxide-aluminate mixture were noted in the third set. Using different techniques, early hydration analysis was carried out on these clinkers with no addition of calcium sulfate, with a predetermined amount of gypsum, and a corresponding amount of hemihydrate. The results of a study which focused on the identification of the early hydration products, and the interrelationship of calcium sulfate form and different alkali combinations on the hydration kinetics are presented.
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