Blended cements, methods for their manufacture, and use of an admixture to increase performance of blended cements
AssigneeSika Technology AG
InventorsAna ARENAS, Jose Manuel FERNÁNDEZ, Cristina VALVERDE, Ramiro GARCIA
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Abstract
A method of manufacturing a blended cement, including a step of co-grinding Portland clinker and cementitious waste material in the presence of a grinding aid selected from alkanolamines, glycols, glycerol, carbohydrates, chlorides, or mixtures thereof. Blended cements obtainable in such method. The use of an admixture selected from alkanolamines, glycols, and/or glycerol to increase the performance after hardening of a blended cement including Portland clinker and a supplementary cementitious material retrieved from cementitious waste material.
Claims15
A method of manufacturing a blended cement, said method comprising the steps of
- (1) providing a Portland clinker,
- (2) providing cementitious waste material,
- (3) providing a grinding aid selected from alkanolamines, glycols, glycerol, carbohydrates, chlorides, or mixtures thereof, and
- (4) co-grinding the Portland clinker and cementitious waste material in the presence of said grinding aid.
A method of reducing the shrinkage of a blended cement, or of a construction material comprising a blended cement, during hardening, said method comprising the steps of
- (i) providing a blended cement comprising Portland cement and a supplementary cementitious material retrieved from cementitious waste material, and
- (ii) adding thereto an admixture selected from alkanolamines, glycols, and/or glycerol.
A method of increasing the compressive strength of a blended cement, or of a construction material comprising a blended cement, after hardening, said method comprising the steps of
- (i) providing a blended cement comprising Portland cement and a supplementary cementitious material retrieved from cementitious waste material, and
- (ii) adding thereto an admixture selected from alkanolamines, glycols, and/or glycerol.
A method to improve the efficiency of the grinding of cementitious waste material comprising a step of adding a grinding aid selected from alkanolamines, glycols, glycerol, carbohydrates, chlorides, or mixtures thereof, wherein the grinding is done without carbonation of the cementitious waste material.
Dependencies are inferred from the claim text.