Corrosion-Reducing Composition and Use Thereof

Abstract

The invention relates to a composition which comprises at least one liquefying agent for a hydraulic composition and at least one aminoalcohol, selected from the group consisting of 2-amino-2-methyl-1-propanol and N-aminopropyl-monomethyl ethanolamine. The invention also relates to the use of said composition for reducing corrosion, especially on steel formwork in precast components or on concrete steel of concrete constructions.

Description

TECHNICAL FIELD[0001]The invention relates to the field of corrosion inhibitors on steel, in particular on steel shuttering in prefabricated elements or on reinforcing steel for concrete constructions. The invention relates especially to a composition comprising at least one plasticizer for a hydraulically setting composition and at least one amino alcohol selected from the group consisting of 2-amino-2-methyl-1-propanol and N-aminopropylmonomethylethanolamine.PRIOR ART[0002]Steel shuttering are molds for casting concrete into which fresh concrete for producing concrete components, also known as prefabricated elements, is introduced. After curing of the concrete, the steel shuttering is normally removed again. The corrosion of steel shuttering represents a great problem and can lead to a reduction in the quality of the concrete, in particular the surface quality of the concrete, and, for example, to undesirable traces of rust on visible concrete. To suppress rust, a concrete release...

AI Technical Summary

Benefits of technology

[0041]The present composition according to the invention has the advantage that it simultaneously acts as plasticizer for a hydraulically setting composition and as corrosion inhibitor for steel. As a result, the corrosion protection is improved further above the corrosion-inhibiting action of the amino alcohol because the use of the plasticizer reduces the amount of make-up water required in the production of concrete and thus decreases the water / cement value (w / c value). The lower the water / cement value, the less susceptible is / are the steel shutting or steel inlays which come into contact with the concrete to corrosion.

[0041]The present composition according to the invention has the advantage that it simultaneously acts as plasticizer for a hydraulically setting composition and as corrosion inhibitor for steel. As a result, the corrosion protection is improved further above the corrosion-inhibiting action of the amino alcohol because the use of the plasticizer reduces the amount of make-up water required in the production of concrete and thus decreases the water / cement value (w / c value). The lower the water / cement value, the less susceptible is / are the steel shutting or steel inlays which come into contact with the concrete to corrosion.

Problems solved by technology

The corrosion of steel shuttering represents a great problem and can lead to a reduction in the quality of the concrete, in particular the surface quality of the concrete, and, for example, to undesirable traces of rust on visible concrete.

These forming oils have the disadvantage that they have only a limited ability to suppress corrosion and thus rust formation and also that they have to be applied individually to each piece of steel shuttering before each use, which is both uneconomical and environmentally polluting.

Corrosion of the steel inlays reduces their strength and thus the strength of the concrete.

This results in stresses in the concrete which can lead to cracks or splitting off of entire pieces.

However, in order to be able to display their action, the corrosion inhibitors have to be used in large amounts, which can be a disadvantage from both an economic point of view and an ecological point of view.

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