KR101457124B1 - High-alkali organic corrosion inhibitor in corrosion performance of reinforced concrete structure and fixing carbon dioxide and chlorine ion - Google Patents

Abstract

The present invention provides a high-alkali organic corrosion inhibitor having corrosion performance of a reinforced concrete structure and a fixing carbon dioxide and a chlorine ion. A high alkaline organic corrosion inhibitor, which is coated on the surface of a reinforced concrete structure to recover alkalinity in the concrete part neutralized, includes an organic amine solution, a high alkaline aqueous solution, and a silane aqueous solution. Accordingly, the high alkaline organic corrosion inhibitor is used in a salt stress and neutralization process of the reinforced concrete structure having a corroded iron bar or corrosion possibility resulting from the salt stress, the neutralization, or and the compound phenomenon of the salt stress and the neutralization.

Description

TECHNICAL FIELD [0001] The present invention relates to a high-alkali organic corrosion inhibitor, and more particularly, to a high-alkali organic corrosion inhibitor having a corrosion inhibiting property of reinforcing concrete structure and fixing of carbon dioxide and chlorine ion.

The present invention relates to an organic antirust agent of a reinforced concrete structure. More particularly, the present invention relates to a method for inhibiting the corrosion and neutralization of a reinforced concrete structure which may cause corrosion or corrosion of a reinforcing steel due to chloride, neutralization or salt- And to a high alkali organic rust inhibitor having a rustproofing property of a reinforced concrete structure and a fixing of carbon dioxide and chlorine ion suitable for use in a repair system method.

In general, the use of rust inhibitor as a countermeasure to inhibit the corrosion of reinforcing steel in concrete structures is very common. The rustproofing agent is divided into a positive electrode active agent (passive membrane type) and a mixed reactive agent (adsorption type) according to the reaction system. In the case of the anticorrosive agent, the protective action is effected through the partial interfacial process and the protective film of the ferric oxidizing agent is reinforced by the iron ion oxidation. However, there is a possibility of inducing a formula when used improperly, and because of toxicity of ingredients, it has already been reduced in developed countries. Recently, mixed rust inhibitor based on organic amine has advantages that it can be used as a maintenance agent on the surface of concrete as well as an admixture, and a desired corrosion prevention effect can be obtained even in a small amount compared with an inorganic corrosion inhibitor. Is increasing.

In addition, paint has been applied to the surface of the cement concrete, or tiles have been attached to protect the cement structure. However, recent environmental deterioration has caused various problems such as corrosion of the outer surface of the building due to soot and acid rain or detachment of the attached tiles. Accordingly, attempts have been made to improve the weatherability, adhesiveness, abrasion resistance, chemical resistance, water resistance, flame retardancy and the like by applying a coating agent to the surface of a cement structure or a tile.

Reinforced concrete structure is considered to be semi-permanent. However, if you look at reinforced concrete structure after aging, ① concrete neutralization, ② rebar corrosion, ③ concrete crack, ④ leakage, ⑤ concrete strength change, ⑥ large strain, ⑦ concrete Surface deterioration, and ⑧ deterioration such as frost damage occur. Therefore, measures to improve the durability of reinforced concrete structures are required. In addition, such deterioration phenomenon leads to corrosion of reinforcing steel, resulting in deterioration of the structural strength of the structure, In some cases, safety is seriously affected.

- Neutralization of concrete -> Corrosion of reinforcing steel -> Cracks and peeling -> Decrease of strength

- Corrosion of concrete -> Corrosion of reinforcing steel -> Cracking, peeling -> Decrease of strength

- Concrete East Sea -> Cracks, peeling -> Corrosion of reinforcing steel -> Decrease of strength

- Concrete crack -> Neutralization and saltation of surrounding concrete -> Corrosion of reinforcing steel -> Decrease of strength

In order to improve the durability of the reinforced concrete structure, it is necessary to develop a repair method for neutralization and saltation, and to develop a repair method for the materials constituting the reinforced concrete structure. Development is very important. In particular, corrosion of steel bars due to neutralization and salt corrosion is a phenomenon caused by an electrochemical reaction. Therefore, in order to fundamentally suppress corrosion, it is necessary to perform fundamental treatment with chemicals.

On the other hand, the salting of the reinforced concrete structure is the phenomenon that the chloride in the concrete deteriorates the reinforcing steel and the concrete due to the corrosion of the reinforcing steel. Generally, the process of incorporating the chloride into the concrete structure is as follows: (2) a case where an admixture containing a large amount of chloride is used, (3) a case where a melting snow agent is applied to a concrete surface, and (4) seawater particles penetrate into a concrete structure from the coast. Here, ① and ② are the intrinsic salt, ③ and ④ are the saline, and the salt damage is caused by the chloride introduced into the concrete to corrode the rebar, causing the crack and the strength reduction of the reinforced concrete structure. Finally, It is a phenomenon that degrades durability.

Inside the concrete, the corrosion of reinforcing steel is greatly suppressed because of the high pH. However, even in this environment, if there is chlorine ion, the passive film is destroyed or the passivation is obstructed by chlorine ion. These phenomenon mechanisms include: (1) dissolution of iron oxide coating of chlorine ions, (2) promotion of dissolution of iron ions by adsorption, (3) progress of continuous product reaction, (4) catalysis of anode reaction, (5) , (6) a decrease in pH, and (7) an increase in electrical conductivity.

Thus, the action of chlorine ions is thought to be indirect and catalytic, but this problem has not been sufficiently clarified yet, and remains a subject of further research.

As a result of the investigation on the relationship between the amount of chloride ion in concrete and the corrosion of steel reinforcing bars, the corrosion limit of steel reinforcing bars in the concrete is generally set at a limit of 0.31.2 kg / ㎥. In most regulations, the chloride ion content is 0.4% or less of the cement weight, the NaCl content is 0.04% or less of the sand clearance weight, and the total amount of chloride ion is 0.3 kg / The limit value of the chloride content of the reinforced concrete structure is considered to be appropriate for the safety value set under the condition that it is not used. Therefore, it is very important to prevent the incorporation of chlorine ions in concrete used materials or to reduce the amount of concrete admixture below concrete amount in concrete production, and it is very important to prevent existing materials such as snowmelt and coastal salt from penetrating into concrete.

In order to prevent the corrosion of existing reinforced concrete structures, preventive countermeasures against the incorporation of internal chloride and fly ash chloride during construction and expansion of concrete structures and corrosion of reinforcing steel by internal chloride and fly ash chloride of existing structures, And can be roughly classified into maintenance and reinforcement measures in the case of

(1) Reinforced concrete surface treatment, (3) Concrete tightening, (4) Reinforcement coating thickness increase, (5) Rust inhibitor use, (6) Electric system.

On the other hand, as a countermeasure against the penetration of fly ash chloride, concrete surface coating is mainly used to prevent penetration of oxygen, moisture and chlorine ions, so that the countermeasure against the salt build-up at the time of constructing the structure is almost completed.

However, the saltwater repair system has not yet been established for structures where there is a risk of corrosion of reinforcing bars due to the existence of an inherent amount of salt existing in existing buildings. As long as chloride ions in concrete are not removed, Could not be. Therefore, it is necessary to develop a coating type antirust agent which removes chloride ions around reinforcing bars or immobilizes chlorine ions and regenerates the passive behavior of reinforcing bars when the salt is contained in the concrete.

Conventionally developed coating type rust inhibitor has problems such as high manufacturing cost, low rust-inhibiting component, and inability to penetrate deeply into the position of reinforcing bar. To solve this problem, development of a low-concentration, high-concentration rust- It is the present situation that it is becoming.

Furthermore, since the neutralization and the salt damage occurring in the reinforced concrete are not progressed individually but are simultaneously combined, measures and measures are needed. However, the materials and the methods for solving the neutralization and the countermeasures against saltiness have not been developed so far, This was being asked.

It is therefore an object of the present invention to provide a reinforced concrete structure capable of preventing corrosion or corrosion of a reinforcing steel due to salt corrosion, The present invention also provides a highly alkaline organic antirust agent having corrosion inhibition properties of reinforcing concrete structures and fixing of carbon dioxide and chlorine ions, which can be used for the corrosion inhibition and neutralization inhibition of structures and for reinforcing steel corrosion repairing systems.

The present invention relates to a glaucoma organic antirust agent for restoring the alkalinity of a neutralized concrete part applied to the surface of a reinforced concrete structure, characterized in that it is composed of an aqueous solution of an organic amino alcohol derivative, a high alkali aqueous solution and a silane aqueous solution.

The organic amine-based aqueous solution is characterized by using 77 to 80% by weight of an aqueous solution of an organic aminoalcohol derivative.

The high alkaline aqueous solution is characterized by using 15 to 18% by weight of an aqueous solution of sodium hydroxide.

The silane-based aqueous solution is characterized by using 2 to 5% by weight of a silane-based solution.

The high alkali organic rust inhibitor having the rustproofing property of the reinforced concrete structure and the fixing of the carbon dioxide and the chlorine ion according to the present invention is a reinforced concrete structure having a possibility of corrosion or corrosion of the reinforcing steel due to saltification, neutralization, The corrosion and neutralization suppression method and the rebar corrosion repair system construction method of the present invention.

In addition, the present invention restores the alkalinity of the neutralized concrete portion when applied to the surface of the existing reinforced concrete structure, thereby suppressing and preventing the rebar corrosion caused by the concrete neutralization. In addition, the concrete structure is densified by fixing carbon dioxide (CO ₂ ) to prevent infiltration of carbon dioxide (CO ₂ ), water (H ₂ O), chlorine ion (Cl ^- ) and oxygen (O ₂ ) Chloride ion (Cl ^- ) existing in the concrete is fixed to suppress the activity and to regenerate the passive film of the reinforcing bar.

Preferred embodiments of the high alkali organic rust inhibitor having the rustproofing property and the fixing of carbon dioxide and chlorine ion of the reinforced concrete structure according to the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. It is to be understood that the following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention of the user, the operator, or the precedent, and the meaning of each term should be interpreted based on the contents will be.

The present invention is intended to be used in a method of inhibiting the corrosion and neutralization of a reinforced concrete structure and a method of repairing corrosion of reinforcing bars, which are likely to corrode or corrode rebar due to saltification, neutralization or saltation and neutralization of a reinforcing concrete structure.

In the present invention, 77 to 80% by weight of an organic amine-based organic aminoalcohol derivative, 15 to 18% by weight of an aqueous solution of NaOH and 2 to 5% by weight of a silane compound are mixed so as to constitute a high molecular weight organic corrosion inhibitor.

Therefore, it has a high alkali (pH 12.0 ~ 13.0) and it restores the alkalinity of the neutralized concrete part by applying it to the surface of the existing reinforced concrete structure to suppress and prevent the rebar corrosion due to the concrete neutralization. In addition, the concrete structure is densified by fixing carbon dioxide (CO ₂ ) to prevent infiltration of carbon dioxide (CO ₂ ), water (H ₂ O), chlorine ion (Cl ^- ) and oxygen (O ₂ ) It inhibits activity by fixing chlorine ion (Cl ^- ) present in concrete and regenerates the passive film of reinforcing bar. Unlike conventional alkali removers and penetrating rust preventives, it is a high alkaline organic system, It is possible to recover the alkaline of the reinforced concrete structure damaged by deterioration and is environmentally friendly as an organic antirust agent capable of removing carbon dioxide and chlorine ions.

The experimental data are as follows.

- active ingredient

  : Organic amine system (organic amino alcohol derivative) + high alkali aqueous solution + silane system

  : Color: Light green transparent solution

  : Viscosity: 5 ~ 10 Cps

  : Specific gravity: 0.9 to 1.2

  : pH: 12.0 or higher

- Production method of organic antirust agent

- Organic antirust agent High alkaline pH 12.0-13.0

- Organic antirust agent CO ₂ fixing

- Organic antirust agent Cl ^- Fixed

- Organic antirust agent, alkali recovery and permeability

The basic properties of high alkali organic rust inhibitor are compared with existing rust inhibitor as shown in Table 1 below.

Basic Properties division High alkali organic rust inhibitor Existing rust inhibitor A Existing rust inhibitor A color Pale green transparent solution Pale green transparent solution Pale green transparent solution Viscosity 5 to 10 cps 5 to 10 cps 5 to 10 cps importance 0.9 to 1.2 1.0 to 1.2 1.0 to 1.2 pH 12.0 to 13.0 10.0 to 12.0 8.0 to 10.0

The test method is as follows.

1) Viscosity - KS M 3825

2) Specific gravity - KS A 0601

3) pH - KS M 0100

The optimum mixing test of high alkali organic rust inhibitor proceeded as shown in Table 2 below.

Optimum Mixing Experiment of High Alkali Organic Antirusting Agent (Unit:% / wt) division Organic aminoalcohol derivative NaOH aqueous solution Silane system A Silane system B pH One 40 30 30 - 12.89 2 50 30 20 - 13.27 3 60 15 10 15 13.15 4 70 15 10 5 13.14 5 70 20 10 - 13.29 6 70 20 - 10 13.27 7 70 15 10 5 13.78 8 70 15 5 10 13.87 9 70 18 3.0 3.0 13.73 10 80 10 5 5 13.45 11 80 10 10 - 13.31 12 80 10 - 10 13.37 13 80 15 5 - 13.52 14 80 15 - 5 13.64 15 80 15 2.5 2.5 13.89 16 80 18 1.0 1.0 13.96

 Manufacture of high alkali organic rust inhibitor

= Organic amino alcohol derivative 77 to 80% by weight +

   15 to 18 wt% aqueous solution of NaOH +

   Silane system A 1.0 to 2.5 wt% + silane system B 1.0 to 2.5 wt%

When the high alkali organic rust inhibitor is incorporated, the displacement of the natural electrode potential of the reinforcing bar is as shown in Table 3 below.

When the high alkaline organic rust inhibitor is mixed, the natural electrode potential (mV) Elapsed time Aqueous salt solution (3.27% NaCl) Incorporation of high alkaline organic antirust agent Existing rust inhibitor A Existing rust inhibitor B Immediately after immersion -402 -203 -325 -311 After 1 hour -308 -136 -229 -210 After 3 hours -453 -114 -192 -183 After 6 hours -510 -103 -187 -165 After 1 day -511 -88 -174 -166 3 days later -515 -67 -163 -159 After 5 days -513 -62 -152 -154 After 7 days -522 -54 -147 -138 After 10 days -536 -35 -130 -137

* Incorporates 495 ml of brine, 5 ml of high alkali organic rust inhibitor, 5 ml of existing technology A, 5 ml of existing technology

As shown in Table 3, when the high alkali organic rust inhibitor is incorporated, it can be seen that the natural electrode potential is much lower than when the conventional rust inhibitor is incorporated.

When the high alkali organic rust inhibitor is incorporated, the degree of fixation of chloride ion is shown in Table 4 below.

Cl ^- Fixation of Chloride with High Alkali Organic Antirust Agent exam Chloride content (%) of sample containing high alkali organic rust inhibitor Amount of chloride (%) of sample mixed with existing rust inhibitor A Amount of chloride (%) of sample mixed with existing antirust agent B Amount of Chloride in the Sample Containing No Antirust Agent (%) One 0.0342 0.0864 0.0935 0.0745 2 0.0147 0.1412 0.0934 0.0996 3 0.0752 0.1396 0.1241 0.1426 4 0.0320 0.0941 0.1063 0.0964 5 0.0257 0.0934 0.0976 0.0867 6 0.0475 0.1023 0.0863 0.1064 7 0.0268 0.9064 0.0769 0.1007 8 0.0321 0.1427 0.0963 0.0934 9 0.0471 0.0976 0.1420 0.0832

* Test method: KS F 2713

As shown in Table 4, the chloride content of the sample containing the high alkali organic rust inhibitor is much lower than the chloride content of the sample containing the conventional rust inhibitor.

The degree of carbon dioxide fixation when the high alkali organic rust inhibitor is incorporated is shown in Table 5 below.

CO ₂ fixation with high alkali organic rust inhibitor division High alkaline organic antirust agent incorporated Existing rust inhibitor A
Incorporated Existing rust inhibitor B
Incorporated Rustproof surface covering material Rust-resistant section restorative Surface covering material Section restorative material Surface covering material Section restorative material Permeability (g) 1.3 2.0 17 15 22 16

* Test method: KS F 4042

When such a high alkali organic rust inhibitor is incorporated, it can be seen that the amount of water permeation is very low compared with the case of incorporating the existing rust inhibitor, and the carbon dioxide fixing performance is excellent.

In addition, organic-based aminoalcohol derivatives, which are organic rust inhibitors, are considered to be economically effective even when the chloride ion content is high, because the amount of the rust inhibitor used is very small.

As described above, the present invention is used in a method for inhibiting the corrosion and neutralization of reinforced concrete structures and a method for repairing rebar corrosion and corrosion of reinforced concrete structures, which are likely to corrode or corrode rebar due to salinization, neutralization or salt /

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof, and various changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but are intended to illustrate and not limit the scope of the technical spirit of the present invention. The scope of protection of the present invention should be construed according to the claims, and all technical ideas which are within the scope of the same should be interpreted as being included in the scope of the present invention.

Claims (4)

A high modulus organic rust inhibitor for restoring the alkalinity of a neutralized concrete part by applying to the surface of a reinforced concrete structure,
An aqueous solution of an organic amine using an aqueous solution of an organic aminoalcohol derivative in an amount of 77 to 80% by weight, a solution of a highly alkaline aqueous solution containing 15 to 18% by weight of an aqueous solution of sodium hydroxide and a silane aqueous solution containing 2 to 5% And a high alkaline organic antirust agent having carbon dioxide and chlorine ion fixation.
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