Patent ID: 8317915

Claim:
A composition comprising, in % expressed by mass relative to the total mass of the composition, from 0.01 to 3% of polycarboxylic acid or a salt thereof, said polycarboxylic acid comprising 2 to 4 carboxyl groups per molecule; and from 97 to 99.99% of a Belite-Calcium-Sulphoaluminate-Ferrite clinker (BCSAF clinker) comprising, in % expressed by mass relative to the total mass of BCSAF clinker from 5 to 30%, of a calcium aluminoferrite phase of a composition corresponding to the general formula C 2 A X F 1−X ), wherein X is from 0.2 to 0.8, wherein C corresponds to CaO, A corresponds to Al 2 O 3 and F corresponds to Fe 2 O 3 ; from 10 to 35%, of a calcium sulfoaluminate phase corresponding to the general formula C 4 A 3 $, wherein $ corresponds to SO 3 ; from 40 to 75% of belite phase corresponding to the general formula C 2 S, wherein S corresponds to SiO 2 ; from 0.01 to 10% of one or more minor phases selected from calcium sulphates, alkali sulphates, perovskite, gehlenite, free lime and periclase, and/or a vitreous phase, and for which the total of the percentages of said phases is greater than or equal to 97%.