Prefabricated water-resistant building element, water-repellent composition, use of a mineral additive and water-repellent composition, and manufacturing process of a building element

摘要

"PREFABRICATED WATER RESISTANT CONSTRUCTION ELEMENT, WATERPROOF COMPOSITION, USE OF A MINERAL ADDITIVE AND A WATERPROOF COMPOSITION, AND, PROCESS OF MANUFACTURING A CONSTRUCTION ELEMENT". Prefabricated water resistant construction element, comprising a substrate based on hardened plaster, said substrate being obtainable by at least the following steps: (a) homogeneous mixture of a dry material comprising, mainly, at least one hydratable calcium sulfate, a hydrofugation agent comprising at least one silicone compound, and water, and pre-forming in the wet state of said substrate; (b) drying the preformed substrate to obtain said substrate formed in the solid and dry state; characterized by the fact that the homogeneous mixture, prior to pre-formation in the wet state of the substrate, also comprises a mineral additive comprising at least one mineral component having a synergistic hydrofugation affinity with said silicon compound.