Activation Property of Blast Furnace Slag by Calcined Alunite

In order to use alunite as an activator of blast furnace slag, we studied the hydration characteristics of the calcined alunite and the ground blast furnace slag. The alunite calcined at consists of KAl( and . The calcined alunite reacts with and gypsum to form etrringite () as fellows:. The ions from calcined alunite reacts with CaO in blast furnace slag to from gypsum, which reacts with CaO and to from ettringite in calcined alunite-blast furnace slag system. Therefore blast furnace slag can be activated by calcined alunite.