This work aims to prepare cement powder by blending dry activator with granulated blast-furnace slag (GBFS). Formerly, geopolymer mortars and concretes were directly formed by the reaction of alumino-silicates sources with alkaline solution. Here, the alkali activator in the form of dry powder is blended with GBFS to produce blended cement powder. Sodium hydroxide (SH) reacts with calcium carbonate (CC) to produce dry activator composed of calcium hydroxide(CH), sodium carbonate (SC) and pirssonite: sodium calcium carbonate (P) according to the following equations