ASCEM CEMENT TECHNOLOGY - ALKALI-ACTIVATED CEMENT BASED ON SYNTHETIC SLAG MADE FROM FLY ASH

Alkali-activated materials harden under the reaction of an alkaline source and a raw material reactive in such way. Different raw materials are suitable for the reaction. The use of secondary raw materials such as granulated blast furnace slags and fly ashes are favored due to environmental aspects such as CO2 emission and resource consumption. A disadvantage of the use of secondary resources is their limited availability or the variability of different batches. Therefore the ASCEM cement technology goes a different way: a synthetic glass is produced under the use of fly ash and correcting materials. The advantage of this is the production of a high reactive glass with a stable quality. That glass can easily be dissolved by a lower need of hydroxide concentration compared to the fly ash. The reactive glass is milled and mixed to 50 % with fly ash as filler as well as with a dry activator. The paper gives an overview over the principle production process, some key properties and data about ecological and economic aspects compared to ordinary Portland cement.