Polyurethane hybrid system combining high compressive strength and early water resistance

Abstract

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.

Description

TECHNICAL FIELD[0001]The invention relates to the use of a multi-component composition, which is a polyurethane hybrid system as an early water resistant construction or repair material, and a method with the polyurethane hybrid system for construction, repair or refurbishment.BACKGROUND OF THE INVENTION[0002]Polymer-modified cements are hybrid systems comprising an organic binder and a hydraulic binder such as cement and are known for a long time. Polymer modification of cement mortar and concrete can noticeably improve application and performance characteristics. Admixtures can improve the concrete properties, e.g. in relation to water absorption reduction, toughness enhancement, and increase of the bond strength. Though polymers are more expensive than cement, polymer admixtures are therefore used in particular applications where these properties are highly valued and where the cost performance ratio is acceptable. For instance, polymer-modified cements are often suitable for rep...

AI Technical Summary

Benefits of technology

The present invention provides a construction or repair material suitable for use in parts that are in contact with water during operation. The material has high resistance against early water immersion, and after curing, it exhibits high mechanical and chemical resistance. The material can cure without blisters or any other surface defects even in direct water contact after a short time. The multi-component composition used in the invention has an unexpected early water resistance, which allows for a full through cure resulting in excellent mechanical and surface properties of the products obtained. The invention is particularly suitable for use in component parts that are in contact with water during operation.

Problems solved by technology

The susceptibility of polymer-modified cements to wet conditions during curing is a particular obstacle to their use for the construction, repair or refurbishment of component parts, which are in contact with water during operation, e.g. off-shore applications.

For instance, repair applications of a water pipeline will require interruption of operation.

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