Building cement and process of obtaining a building cement

Details Building cement and process of obtaining a building cement Building cement and process of obtaining a building cement

C - Chemistry, Metallurgy

04

B

C04B 7/00 (2006.01) C04B 7/32 (2006.01) C04B 14/04 (2006.01)

Patent

CA 2537283

The cement comprises a belite clinker (A) and a second component (B) made up of particles of at least one ceramic material. Preferably this second component has a particle size under 100 nm, and is present in a ratio between 0.2% and 15% by weight of the belite component (A). This cement has the advantages of conventional belite cement and also has better mechanical properties. The process for obtaining a building cement comprises the steps of: (a) producing a belite cement (A) clinker from low lime content fly ash by adding lime (CaO) to the clinker until reaching a CaO/SiO2 molar ratio greater or equal to 2 and hydrothermally treating the mixture; (b) grinding the obtained clinker; and (c) adding to the clinker a second component (B) made up of at least one ceramic material with a particle size under 100 nm.

L'invention concerne un ciment qui comprend un clinker à base de bélite (A) et un deuxième composant (B) constitué par des particules d'au moins un matériau céramique. De préférence, la taille des particules de ce deuxième composant est inférieure à 100 nm, et ce dernier est présent selon une proportion comprise entre 0,2 % et 15 % en poids du composant à base de bélite (A). Ce ciment possède les avantages du ciment à base de bélite classique et présente également de meilleures propriétés mécaniques. Le procédé d'obtention d'un ciment de construction comprend les étapes consistant : (a) à produire un clinker de ciment à base de bélite (A) à partir de cendres volantes à faible teneur en chaux, par apport de chaux (CaO) au clinker jusqu'à obtention d'un rapport molaire CaO/SiO¿2? supérieur ou égal à 2 et par traitement hydrothermique de ce mélange ; (b) à moudre le clinker obtenu ; et (c) à ajouter au clinker un deuxième composant (B) composé au moins d'un matériau céramique dont la taille des particules est inférieure à 100 nm.

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