Water-resistant plaster-based prefabricated construction...

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 28/14 (2006.01) C04B 14/10 (2006.01) C04B 14/42 (2006.01) C04B 24/42 (2006.01)

Patent

CA 2361711

A water-resistant prefabricated construction element comprising a hardened plaster-based substrate which can be obtained according to the following steps: (a) homogeneously mixing a dry material that essentially contains at least one hydratable calcium sulphate, a hydrofugating agent comprising at least one silicon compound and water, together with preforming of said substrate in a wet state, (b) the preformed substrate is dried in order to obtain a formed substrate in a solid, dry state. The invention is characterised in that the homongeneous mixture, prior to preforming when the substrate is in wet state, also comprises a mineral additive containing at least one mineral component that has a synergistic hydrogenating affinity with said silicon compound.

Elément de construction préfabriqué résistant à l'eau, comprenant un substrat à base de plâtre durci, ledit substrat étant susceptible d'être obtenu par au moins les étapes suivantes: (a) mélange homogène d'une matière sèche comprenant majoritairement au moins un sulfate de calcium hydratable, d'un agent d'hydrofugation comprenant au moins un composé siliconé, et d'eau, et préformage à l'état humide dudit substrat; (b) séchage du substrat préformé, pour obtenir ledit substrat formé à l'état solide et sec; caractérisé en ce que le mélange homogène, préalable au préformage à l'état humide du substrat, comprend également un additif minéral comportant au moins un composant minéral ayant une affinité synergique d'hydrofugation avec ledit composé siliconé.

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