Lafarge

Holcim Technology Ltd

Rémi Barbarulo

Martin Mosquet

Horacio Naranjo

Fabrice Toussaint

Gërard Molines

Christine Chaumilliat

Gérard Molines

Marcel Rayane

A hydraulic binder includes, as percentage by mass: from 17 to 55% of a Portland cement, the particles of which have a D50 of from 2 &#x3bc;m to 11 &#x3bc;m; at least 5% of silica fume; from 36 to 70% of a mineral addition A1, the particles of which have a D50 of from 15 to 150 &#x3bc;m; the sum of these percentages being from 80 to 100%; the sum of the percentages of cement and of silica fume being greater than 28%; the mineral addition A1 being selected from slags, pozzolanic additions or siliceous additions such as quartz, silico-calcareous mineral additions, calcareous additions such as calcium carbonate or mixtures thereof.

Ultra-high performance concretes having a low cement content

A method includes using a composition in the production of cement, the composition including at least one dispersing agent and at least one sacrificial molecule to partially or totally retain the properties of the dispersing agent; being either in the form of a liquid solution, or an emulsion or a suspension; the quantity of the sacrificial molecule in the composition representing at least 5% by mass of the mass of dispersing agent; and being introduced before or during the grinding of the clinker.

Protection of a dispersing agent during a grinding operation

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Saint Quentin Fallavier, France

Rémi Barbarulo