Patent ID: 8741055

Claim:
Method for the production of an alkali activated hydraulic binder, the binder comprising slag, natural aluminum silicates, and an alkali activator, and said binder being free of CaSO 4 , wherein the slag is provided in amounts greater than or equal to 20% (w/w); the natural aluminum silicates are different from furnace slag, and are provided in amounts from 5 to 75% (w/w); and the alkali activator is provided in an amount which corresponds to a Na 2 O equivalent defined as (Na 2 O+0.658 K 2 O) (ASTM C 150) between 0.7 and 4% (w/w), comprising the step of heat treating a mixture of said slag, said natural aluminium silicates, and said alkali activator at temperatures between 40° C. and 50° C. for 4 to 6 hours.