Additives for cement

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 22/08 (2006.01) C04B 24/12 (2006.01) C04B 28/06 (2006.01)

Patent

CA 2712437

The invention provides a belite-calcium sulphoaluminate-ferrite (BCSAF) cement composition comprising: a BC-NAP clinker which clinker has the following mineralogical composition, based on the total weight of the clinker: 5 to 25%, preferably to 20%, of a calcium aluminoferrite phase having the general formula C2A x F(1- X), wherein X is from 0.2 to 0.8; 15 to 35% of a calcium sulphoaluminate phase; 40 to 75% of belite (C2S); from 0.01 to 10% in total of one or more minor phases selected from calcium sulphates, alkali metal sulphates, perovskite, calcium aluminates, gehlenite, free lime and periclase and/or a vitreous phase; and an alkanolamine.

La présente invention concerne une composition de ciment de bélite-sulfoaluminate de calcium-ferrite (BCSAF) comprenant : un mâchefer BCSAF, ledit mâchefer ayant la composition minéralogique suivante, sur la base du poids total du mâchefer : de 5 à 25 %, de préférence de 10 à 20 %, dune phase daluminoferrite de calcium ayant la formule générale C2AxF(1-X), dans laquelle X est de 0,2 à 0,8 ; de 15 à 35 % dune phase de sulfoaluminate de calcium ; de 40 à 75 % de bélite (C2S) ; de 0,01 à 10 % au total dune ou plusieurs phases mineures choisies parmi des sulfates de calcium, des sulfates de métal alcalin, la pérovskite, des aluminates de calcium, la gehlénite, la chaux libre et la périclase et/ou une phase vitreuse ; et une alcanolamine.

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