Patent ID: 8568528

Claim:
A sulfo-belitic clinker comprising, as phase composition, relative to the total weight of the clinker: from 5% to 60% of iron-doped calcium sulfo-aluminate phase corresponding to the formula C 4 A x F y $ Z with x varying from 2 to 3, y varying from 0 to 0.5 and y being other than 0, and z varying from 0.8 to 1.2; from 0 to 25% of calcium aluminoferrite phase having a composition corresponding to the general formula C 6 A x′ F y′ , with x′ varying from 0 to 1.5 and y′ varying from 0.5 to 3; and from 20% to 70% of C 2 S belite phase; less than 10% of C 11 S 4 B phase.