The invention relates to the use 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, as an early water resistant construction or repair material for constructing, repairing or refurbishing component parts, wherein the mixed and applied multi-component composition is immersed in water not later than 8 hours, preferably not later than 2 h, after application.

The use as an early water resistant construction or repair material is especially suitable for component parts, which are in contact with water during operation such as offshore wind energy plants or water retaining systems, e.g. pipelines.

The invention comprises a method of curing concrete. The method comprises placing a concrete cylinder in an insulated container having a sufficient quantity of water therein so that the concrete cylinder is submerged in and surrounded by the water and selectively adding heat to the quantity of water in an insulated container, so that the temperature of the quantity of water follows a predetermined temperature profile. Apparatus for performing the method is also disclosed.

The invention comprises a method of curing concrete. The method comprises placing a concrete cylinder in an insulated container having a sufficient quantity of water therein so that the concrete cylinder is submerged in and surrounded by the water and selectively adding heat to the quantity of water in an insulated container, so that the temperature of the quantity of water follows a predetermined temperature profile. Apparatus for performing the method is also disclosed.

A multi-component composition including A) a polyol component (A) including at least one polyol and water, B) a hardener component (B) including at least one polyisocyanate, and C) a solid component (C) including a hydraulic binder and one or more aggregates, as an early water resistant construction or repair material for constructing, repairing or refurbishing component parts, wherein the mixed and applied multi-component composition is immersed in water not later than 8 hours, preferably not later than 2 hours, after application. The use as an early water resistant construction or repair material is especially suitable for component parts, which are in contact with water during operation such as offshore wind energy plants or water retaining systems, e.g. pipelines.

A multi-component composition including A) a polyol component (A) including at least one polyol and water, B) a hardener component (B) including at least one polyisocyanate, and C) a solid component (C) including a hydraulic binder and one or more aggregates, as an early water resistant construction or repair material for constructing, repairing or refurbishing component parts, wherein the mixed and applied multi-component composition is immersed in water not later than 8 hours, preferably not later than 2 hours, after application. The use as an early water resistant construction or repair material is especially suitable for component parts, which are in contact with water during operation such as offshore wind energy plants or water retaining systems, e.g. pipelines.