Lafarge

Cedric Roy

Serge Sabio

Fabrice Toussaint

Cedric Juge

Sylvain Duchand

Isabelle Javierre

Helene Lombois-Burger

Sebastien Bernardi

Christian Blachier

A process for producing a mineral foam includes (i) separately preparing one or more slurries of cement, and an aqueous foam for which a D50 of bubbles is less than or equal to 400 &#x3bc;m; (ii) homogenizing the one or more slurries of cement with the aqueous foam to obtain a slurry of foamed cement; (iii) casting the slurry of foamed cement and leaving the cast slurry of foamed cement to set.

Insulating mineral foam

A method for controlling at least one workability parameter of a concrete contained in the container of a mixer with a non vertical rotational axis, includes making the container turn at least at least two different rotational speeds; determining, for each of the rotational speeds, a rotary drive torque C of the container, a value of shear stress r of the concrete and a speed gradient &#x3b3; of the concrete according to the following relationships: &#x3c4;=T(&#x3c9;)&#xb7;C and &#x3b3;=G(&#x3c9;). &#x3c9; where T and G are predetermined functions; determining a relationship of variation of shear stress &#x3c4; according to the speed gradient &#x3b3; by extrapolation and/or approximation from the determined values; and providing an indication of the workability parameter of the concrete based on the relationship variation.

Method for controlling a workability parameter of a concrete in a mixer

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Saint Quentin Fallavier, France

Cedric Roy