Lafarge

Societe Anonyme Dite: Lafarge

Jacques Gaillard

Jean-Pierre Caspar

Jacques Baudouin

A method of producing mineral fillers containing hydrated calcium monocarboaluminate. Al(OH).sub.3, CaCO.sub.3 and Ca(OH).sub.2 are reacted together in the presence of water, the operating temperature range being of 50.degree. C.-100.degree. C. Although these materials are insoluble, a quick reaction occurs as well in a highly concentrated solid medium as in a diluted medium. According to a preferred embodiment, the amount of water is such to obtain a final dry matter content of 50%, and the substantially solid resulting paste is directly brought to the fluidity required for use by means of a defloculating agent. Application to paper coating.

Method to produce mineral fillers containing hydrated calcium

A binder for producing mortars or micro-concretes containing, by weight, 87% CPA 400 or CPA 500 cement, 13 to 19% aluminous cement and 0.1 to 1.0% of an organic agent. The mortars and micro-concretes prepared by means of said binder are adapted to spraying, in the moist state, or trowelling onto vertical, inclined or horizontal supports without any particular precautionary measure.

Novel binder and its utilization for preparing quick-setting mortars and

The present invention relates to an improvement in the process of U.S. Pat. No. 4,002,484, making it possible to obtain ettringite in fiber form. According to the invention, the process is carried out in the same way as in U.S. Pat. No. 4,002,484 but with enough water to assure having a suspension containing a maximum of 25% dry matter at the end of the reaction, and in subjecting said suspension to moderate stirring of 1 to 5 times the force necessary to maintain a homogeneous suspension. Application to the replacement of asbestos fibers, notably as a fire-proof product.

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Villeneuve de Berg Ardeche, France

Jacques Gaillard