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Corrosion inhibitor of steel reinforced concrete

A technology for corrosion of reinforced concrete and steel bars, applied in the field of reagents with corrosion inhibition

Inactive Publication Date: 2008-09-24
GOLDSCHMIDT CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to ecological and toxicological considerations it has the disadvantage that it is water soluble and can be easily washed out from building materials with cement-based mineral binders
[0011] It has been suggested that none of the current corrosion inhibitors for reinforcement in cement-bound mineral building materials (concrete) can be applied to the surface of the building material in the presence of an already existing structure and prevent corrosion of the reinforcement in the presence of active corrosion

Method used

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  • Corrosion inhibitor of steel reinforced concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Treat concrete with a mixture of isobutyltriethoxysilane and diethylaminoethanol.

[0061] 980 g of isobutyltriethoxysilane and 20 g of diethanolamine were mixed and stirred at 40° C. for 30 minutes. The viscosity of the product is 1 mPas.

[0062] Reinforced concrete test blocks (30 x 30 x 18 cm) corresponding to Fig. 1 having artificial cracks on the upper side with cracks extending along the steel bars were treated with the liquid low-viscosity corrosion inhibitor described above for a period of about 65 days. For this reason, each time 180g / m 2 Spray the surface three times with the applied amount. The drying time between each spray application was 45 minutes. A plexiglass edge is then provided on the treated concrete surface. Seal the plexiglass edge to the concrete with a plastic sealant. A 15% by weight NaCl aqueous solution was filled into the groove thus formed. The makrozelle corrosion current was determined by means of Ohm's law by measuring the voltage...

Embodiment 2

[0070] Treat concrete with isobutyltriethoxysilane.

[0071] Reinforced concrete test pieces (30 x 30 x 18 cm) corresponding to Fig. 1 with artificial cracks for a period of about 65 days were treated with isobutyltriethoxysilane on the upper side with cracks extending along the reinforcement bars. The product purity was approximately 95% (GC WLD area percent). 180g / m each time 2 Spray the surface three times with the applied amount. The drying time between each spray application was 45 minutes. A plexiglass edge is then provided on the treated concrete surface. Seal the plexiglass edge to the concrete with a plastic sealant. A 15% by weight NaCl aqueous solution was filled into the groove thus formed. The large cell corrosion current is determined by means of Ohm's law by measuring the voltage drop across a 10 ohm resistor connected above and below the rebar. The concrete coupons were all brine loaded at about 20°C for 4 days to remove the salt solution and dried at abo...

Embodiment 3

[0079] Treatment of concrete with a mixture of oligopropylsiloxane and aminopropyltriethoxysilane

[0080] 980 g of oligomeric n-propylethoxysiloxane with an average molecular weight of about 600 g / mol and a viscosity of 5 mPas and 20 g of 3-aminopropyltriethoxysilane were mixed and stirred at 40° C. for 30 minutes. The viscosity of the product is about 5 mPas.

[0081] Reinforced concrete test blocks (30 x 30 x 18 cm) corresponding to Fig. 1 having artificial cracks on the upper side with cracks extending along the steel bars were treated with the liquid low-viscosity corrosion inhibitor described above for a period of about 65 days. For this purpose, each time about 200g / m 2 Spray the surface three times with the applied amount. The drying time between each spray application was 90 minutes. A plexiglass edge is then provided on the treated concrete surface. Seal the plexiglass edge to the concrete with a plastic sealant. A 15% by weight NaCl aqueous solution was filled ...

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Abstract

The present invention relates to a reagent containing organosilane and / or organo-silicone, use of the reagent, and a method for using the reagent to reduce the positive corrosion of the steel bar in the concrete. In addition, the present invention also relates to concrete that is produced by the reagent of the present invention.

Description

technical field [0001] The present invention relates to agents having a corrosion inhibiting effect, their use and a method for reducing the active corrosion of reinforcement in concrete. In addition, the present invention also relates to the concrete obtained by using the agent. Background technique [0002] Although reinforced concrete is generally believed to be very durable, although the lifespan of reinforced concrete buildings is generally planned to be 100 years, significant damage to concrete buildings due to steel corrosion sometimes occurs only a few decades after the building is constructed. Significant damage to the reinforcement often occurs in less than 20 years. This leads to costly restoration work. There is therefore an urgent need for effective corrosion inhibitors for reinforced concrete. [0003] To this end, different measures have been taken in the past: [0004] Corrosion inhibiting concrete additive materials such as alkali metal nitrites or alkal...

Claims

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Application Information

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IPC IPC(8): C04B24/40C04B103/61
CPCC04B40/0039C04B2103/61C04B28/02
Inventor B·斯坦德克E·麦克格蒂冈
Owner GOLDSCHMIDT CHEM CORP
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