A description is given of the results of investigations into the influence of primary mineral phase separation during granulation on the hydraulic reactivity of granulated blastfurnace slags. Carefully controlled investigations on 4 industrial and 30 synthetic granulated blastfurnace slags show that the formation of domains and primary mineral phases is dependent mainly on the chemical composition of the blastfurnace slags. Merwinitic segregation as well as merwinite as a primary phase can occur in all cases in which the basicity C/S is greater than 1 and (C + M)/S is greater than 1.3. Melititic segregation and melilite as a primary phase are very rare in basic granulated blastfurnace slag as the basicity is usually higher than 1. There is no generally detectable significant relationship between the primary mineral phase and the reactivity of granulated blastfurnace slag.
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