Patent ID: 7435768
Filing Date: 2008-10-14
Classification: C04B,C09K

Abstract:
1. A method of producing a foamed cement slurry, wherein the following stages are carried out: mixing a hydraulic binder with water so as to obtain a cement slurry, the hydraulic binder being selected from the group consisting of class G Portland cements, class H Portland cements, aluminous cements whose alumina content is at least above 30% by mass, sulfoaluminous cements and plasters, and the proportion of water ranges between 0.2% and 20% by mass in relation to the mass of hydraulic binder, introducing a foaming agent in the cement slurry, the proportion of foaming agent ranging between 0.2% and 20% by mass in relation to the mass of hydraulic binder, the foaming agent being a hydrosoluble polymer comprising hydrophobic units, pumping the cement slurry comprising the foaming agent, and injecting, a gas into the cement slurry comprising the foaming agent and stirring the mixture of slurry and of gas so as to foam the slurry and to obtain a foamed cement slurry.