Patent ID: 7850776

Claim:
A sulphoaluminate clinker, comprising as a phasic formulation, compared with the total weight of clinker: 5 to 25% of a calcium aluninoferrite phase with a formulation corresponding to the general formula C2AXF(1−X), with X comprised between 0.2 and 0.8; 15 to 35% of a calcium sulphoaluminate phase yee' limit (C4A3$); 40 to 75% belite (C2S), wherein C represents CaO, A represents Al 2 O 3 , F represents Fe 2 O 3 , S represents SiO 2 and $ represents SO 3 ; from 0.01 to 10% of one or several minor phases selected from the group consisting of calcium sulphates, alkali sulphates, perovskite, calcium aluminates, gehlenite, free lime and periclase, and/or a vitreous phase, and one or several secondary elements selected from the group consisting of sulphur, magnesium, sodium, potassium, boron, phosphorus, zinc, manganese, titanium, fluorine, chlorine, present in the following quantities: from 3 to 10% of sulphur expressed as sulphuric anhydride, up to 5% of magnesium expressed as magnesium oxide, up to 5% of sodium expressed as sodium oxide, up to 5% of potassium expressed as potassium oxide, up to 3% of boron, expressed as boron oxide, up to 7% of phosphorus expressed as phosphoric anhydride, up to 5% of zinc, manganese, titanium or mixtures thereof, expressed as oxides of these elements, up to 3% of fluoride, chloride, or mixtures thereof, expressed as calcium fluoride and calcium chloride, the total content of said one or several secondary elements being less than or equal to 15%.