Method of controlling the hydration behaviour of gipsum in...

C - Chemistry – Metallurgy – 04 – B

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C04B 40/00 (2006.01) C04B 11/28 (2006.01) C04B 40/02 (2006.01)

Patent

CA 2166785

Described is a method of controlling the ratio of the hydration time (HZ) to the open time (OZ) in the manufacture of composite materials. The mixtures from which the boards are manufactured consist of hydratable calcium sulphate, in particular gipsum binders, aggregates, fibres, water additives and other additives The HZ:OZ ratio is less than 1. This is achieved by adding a retarder-accelerator combination and using pressure. This gives a maximum reduction in the hydration time for the manufacturing process relative to the open time.

On décrit un procédé destiné à influer de manière adéquate sur le rapport du temps d'hydratation (HZ) au temps ouvert (OZ) dans la fabrication des matériaux composites. Les mélanges de substances à partir desquelles sont fabriqués les panneaux se composent de sulfate de calcium hydratable, en particulier de liants du plâtre, d'agrégats, de fibres et d'additifs de l'eau et d'autres additifs. Le rapport (HZ:OZ) est inférieur à 1. Ce résultat est obtenu par l'adjonction d'une combinaison retardateur-accélérateur associée à l'action de la pression. Cela permet de réduire au minimum le temps d'hydratation nécessaire pour le processus de fabrication par rapport au temps ouvert.

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