Polyurethane hybrid system combining high compressive strength and early water resistance

A method for the construction, reparation or refurbishment of component parts by means of a multi-component composition comprising

• A) a polyol component (A) comprising at least one polyol and water,
• B) a hardener component (B) comprising at least one polyisocyanate, and
• C) a solid component (C) comprising a hydraulic binder and one or more aggregates,
• wherein the method comprises the steps of
• a) providing a space where the component part is to be constructed, repaired or refurbished so that the space is not in contact with water,
• b) mixing components (A), (B) and (C) of the multi-component composition to provide a construction or repair material,
• c) applying the construction or repair material on a desired location and in a desired shape within the space provided and initial curing of the construction or repair material to construct, repair or refurbish the component part, and
• d) bringing the component part in contact with water so that the applied construction or repair material is immersed in water not later than 8 hours after application.