KR101740500B1 - Repair filler for concrete structures having excellent chemical resistance and its repair method - Google Patents

Abstract

The present invention relates to a slag-containing mixture comprising 8 to 30% by weight of a slag-containing mixture, 1 to 6% by weight of gypsum and 50 to 75% by weight of magnesia- By weight, 40 to 60% by weight of ordinary portland cement, and 0.1 to 2% by weight of jute fibers; Mixing 5 to 50% by weight of the binder material with 10 to 40% by weight of limestone as a filler and 15 to 55% by weight of silica sand having an average particle size of 0.2 to 2.5 mm as an aggregate to obtain a repair material for a concrete structure; A mixture of 18 to 23 wt% of triethoxysilane, 5 to 8 wt% of isopropanol, 32 to 55 wt% of silica sol, 16 to 21 wt% of pine zeolite, 13 to 26 wt% of purified water, 0.1 to 0.3 wt% of zinc oxide, Mixing 9 to 15% by weight of the mixture with stirring to 80 to 90 minutes while heating to 50 to 80 ° C to obtain a repair reinforcement; Chipping the target surface of the damaged concrete structure and finishing the repair section until an undamaged portion is obtained; Applying and curing the repair material for the concrete structure to the trimmed section; And a step of applying the repairing material for the concrete structure and spraying and drying the repairing reinforcement on the cured repairing end, and to a repairing method for a concrete structure having excellent chemical resistance and a repairing method.
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a cement mortar composition which is resistant to chemical corrosion caused by noxious gas, particularly sulfuric acid gas, induces premature curing, increases durability of mortar, It is excellent in removal, has excellent indoor air purification effect, and is excellent in anion and far-infrared radiation dose, thus being eco-friendly.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a repair reinforcement for a concrete structure having excellent chemical resistance,

The present invention relates to a repair reinforcing material for a concrete structure having excellent chemical resistance and a method of repairing the same, and more particularly, to a repairing method for a concrete structure which is resistant to chemical corrosion caused by noxious gas, especially sulfuric acid gas, induces early curing, A reinforcing stiffener for a concrete structure which is excellent in adhesion strength and adhesion, excellent in toxic removal, excellent in indoor air purification effect, excellent in anion and far-infrared radiation dose, and environment-friendly and excellent in chemical resistance And a maintenance method.

Generally, a concrete structure is a structure based on cement. Cement is a hydraulic material that produces a stable material through hydration reaction with water. In this hydration reaction, calcium hydroxide corresponding to about 1/3 of the amount of cement is produced. The calcium hydroxide exhibiting a strong alkaline pH of about 12 to 13 generates a passive film around the reinforcing bars inside the structure, so that the strength of the structure is maintained without corrosion of the reinforcing bars.

However, due to the nature of the concrete structure, many micro cracks occur during the initial curing process. When the water penetrates through cracks in the crack, the cracks of the concrete structure are accelerated by the repetition of the freezing and thawing of the water according to the temperature change, and the durability is remarkably lowered. In particular, when acidic substances such as carbon dioxide, which is increasing due to saline or air pollution, penetrate into the concrete structure, the corrosion and neutralization of the concrete structure progresses and corrosion of the reinforced concrete embedded in the inside of the concrete structure Promote.

That is, the acidic material reacts with the calcium hydroxide in the cement hydrate to lower the pH of the concrete structure to below 10, and the passive film around the inner reinforcing structure is destroyed and the structure is deteriorated by the corrosion of the reinforcing steel. When the rebar is corroded, its volume increases. The increase in the volume of the rebar acts as a tensile force on the surface of the structure, thereby weakening the strength of the structure by further growing cracks on the surface.

As such, deterioration of concrete is progressed by physical and chemical environmental conditions, and large-scale repair is required.

As a method for repairing such a concrete structure, various repair material compositions are used. Particularly, the cement repair mortar including the aggregate part such as silica sand, the binder part made of cement, and the fiber reinforcing material such as glass fiber or carbon fiber has cracks at the early stage of curing after application and peeling phenomenon due to poor adhesion at the construction interface .

The most frequently occurring failure of the concrete structural part repairing material is that when the maintenance material is injected into the deteriorated concrete section, the concrete is cured by spraying and plastering, And the curing failure occurs at the old interface. That is, there is a problem in that the concrete section maintenance material is rapidly dried and settled (a state in which the cement does not bind to each other but exists in the form of a powder with a white coat). As a result, the interfacial adhesion strength with the pre-repair concrete is lowered, resulting in a decrease in the bonding strength and a defect after repair such as lifting.

In order to solve these problems, "Mineral name" (300-600) 50 (weight ratio), white portland cement 40 (weight ratio), alumina cement [Alumina cement] 10 (Weight ratio), purified water (water) 65 (weight ratio) containing a polyacrylate-late copolymer emulsion containing a special multi-functional group and an acrylic copolymer resin emulsion -70, Reactivesurface Active Agent 0.2-0.3 by weight, Non-Silicone Deformen 0.2-0.3 by weight, In-glass Preservative 0.2 by weight and Preservative 2 [ Reinforced powder (product A) on the emulsion composed of an inorganic pigment [Fungicide] 0.5, a fragrance [banana] 0.1 (weight ratio) and an optionally mixed aqueous pigment [Inorganic pigment] 1: a mixture of the reinforcing admixture (B) 1 and the reinforcing reinforcing admixture King and poured concrete repair to be exposed reinforcement "is but the sacrifice Patent No. 10-0220562 arc bar to construction, there is a problem in the Salt or Sea of Japan and the level of resistance short of expectations.

The admixture may further contain at least one selected from the group consisting of 15 to 55 wt% of cementitious binder, 15 to 55 wt% of fine aggregate, 0.1 to 30 wt% of admixture and 5 to 40 wt% of water, 0.1 to 10 wt% of methacrylate-butyl acrylate resin, 0.1 to 10 wt% of polyvinyl acetate ethylene resin, 0.1 to 10 wt% of polystyrene-butyl acrylate resin, and 0.01 to 5 wt% of methacrylamide, The cementitious binder comprises 20 to 90 wt% of crude steel cement, 5 to 50 wt% of magnesium sulfoaluminate, 0.1 to 20 wt% of alumina cement, 0.1 to 20 wt% of calcium aluminate, 0.1 to 20 wt% of blast furnace slag, 20 to 20 wt%, gypsum 0.1 to 10 wt%, and aluminum powder 0.01 to 5 wt%. "As disclosed in this patent registration No. 10-1352903, it can be used as a temporary short term measure , Initial intensity expression There is a weak and long-term strength improvement, and the lifetime and the strength level are inferior to the expectation.

Also, despite these efforts, deterioration of the concrete structure due to deterioration can not be suppressed. As a result, there is a real problem that maintenance and reinforcement are required in terms of maintenance of the concrete structure.

Accordingly, there is a real need for a repair material for a concrete structure having superior performance such as initial strength development, adhesive strength, crack prevention, chemical resistance and durability.

(1) Korean Patent Registration No. 10-0220562

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to solve the above problems, and it is an object of the present invention to provide a fire- It is an object of the present invention to provide a repair reinforcing material and a repairing method for a concrete structure excellent in strength and adhesion, excellent in toxic removal, excellent in indoor air purification effect, excellent in anion and far-infrared radiation dose and excellent in environment-friendly chemical resistance.

In order to achieve the above object, the present invention provides a repair and reinforcement material for a concrete structure comprising 18 to 23% by weight of triethoxysilane, 5 to 8% by weight of isopropanol, 32 to 55% by weight of silica sol, 16 to 21% 13 to 26% by weight of purified water, 0.1 to 0.3% by weight of zinc oxide, and 9 to 15% by weight of sodium hydroxide.

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In the repair method for a concrete structure of the present invention, 8 to 30% by weight of a slag-containing mixture, 1 to 6% by weight of gypsum and 50 to 75% by weight of magnesia phosphate cement are mixed and pulverized in a vibration mill to obtain an average particle size of 10 to 20 μm 15 to 60% by weight of the cemented cement, 40 to 60% by weight of the ordinary portland cement, and 0.1 to 2% by weight of the jute fibers.

Mixing 5 to 50% by weight of the binder material with 10 to 40% by weight of limestone as a filler and 15 to 55% by weight of silica sand having an average particle size of 0.2 to 2.5 mm as an aggregate to obtain a repair material for a concrete structure;

A mixture of 18 to 23 wt% of triethoxysilane, 5 to 8 wt% of isopropanol, 32 to 55 wt% of silica sol, 16 to 21 wt% of pine zeolite, 13 to 26 wt% of purified water, 0.1 to 0.3 wt% of zinc oxide, Mixing 9 to 15% by weight of the mixture with stirring to 80 to 90 minutes while heating to 50 to 80 ° C to obtain a repair reinforcement;

Chipping the target surface of the damaged concrete structure and finishing the repair section until an undamaged portion is obtained;

Applying and curing the repair material for the concrete structure to the trimmed section; And

Applying the repair material for the concrete structure, and spraying and drying the repair reinforcement material on the cured repair surface.

Thus, the present invention exhibits a characteristic of having a chemical resistance that is resistant to chemical corrosion caused by harmful gas, particularly sulfuric acid gas, due to active silicon dioxide (SiO2) which is a reactive active ingredient of the material by using blast furnace slag.

In addition to the ordinary portland cement as a binder, when gypsum is used, rapid curing is induced, and the adhesive strength between the binder and the concrete surface to be applied can be enhanced by applying the slag-containing mixture.

In addition, when a mixture containing the slag-containing mixture contained in the binder is finely pulverized, the physical strength such as the compressive strength of the maintenance surface is strengthened, the adhesion strength with the concrete surface is enhanced, and the durability, the water resistance and the chemical resistance are improved Maintenance and reinforcement effect can be maintained for a long time.

In particular, the inclusion of a repair reinforcement material on the repair section can fundamentally prevent deformation of the repair section due to an external impact, thereby greatly increasing the chemical resistance.

Further, by using a maintenance reinforcing material containing a pine zeolite, it is excellent in toxic removal, excellent in indoor air purification effect, and excellent in negative ion and far-infrared radiation dose, thus being eco-friendly.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart showing a maintenance method of a concrete structure having excellent chemical resistance, which is an embodiment of the present invention, by a repair reinforcement material according to a time difference; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more 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.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the user, the intention or custom of the operator, and the like.

Therefore, it goes without saying that the definition should be based on the contents throughout this specification.

The present invention provides a repair reinforcement for a concrete structure having excellent chemical resistance comprising 18 to 23% by weight of triethoxysilane, 5 to 8% by weight of isopropanol, 32 to 55% by weight of silica sol, 16 to 21% by weight of pine zeolite, 26% by weight, zinc oxide 0.1-0.3% by weight, and sodium hydroxide 9-15% by weight.

That is, 35% by weight of silica sol and 15% by weight of purified water were mixed and heated to 80 ° C. 9% by weight of sodium hydroxide and 0.3% by weight of zinc oxide were mixed and sodium hydroxide and zinc oxide dissolved therein , 18.7 wt% of triethoxysilane, 6 wt% of isopropanol and 16 wt% of pine zeolite are added to the mixture, and the mixture is agitated at 80 DEG C for 90 minutes to obtain a liquid repair reinforcement.

The repairing reinforcement according to the present invention protects and protects the repair section by shielding and repairing the repair section by spraying the repairing reinforcement on the repair section, thereby fundamentally preventing deformation of the repair section due to external impact, The chemical resistance of the substrate is greatly increased.

Also, it is very preferable to use as a repairing reinforcement on the concrete repair section inside the house because it is excellent in toxic removal, excellent in indoor air purification effect, and excellent in anion and far-infrared ray radiation dose by using maintenance reinforcing material containing pine zeolite Do.

The triethoxysilane serves to improve the flexibility, drying speed and storage stability of the silica sol. The triethoxysilane may be contained in an amount of 18 to 23% by weight. When the triethoxysilane is less than 18% by weight, the water resistance and flexibility can not be secured. When the triethoxysilane is more than 5% by weight, the binder gradually becomes hard and the storage property may be deteriorated.

The isopropanol has a boiling point of 82.5 ° C. Flammable liquid well mixed with water, alcohol, ether, chloroform. However, it does not dissolve in salt solution. It is used not only as a cryoprotectant, various solvents, alkaloid extracting or cosmetic ingredients, but also as a preservative, disinfectant, etc. Drinking or sucking a large amount may cause various symptoms such as facial flushing, headache, dizziness, depression, nausea, anesthesia, and coma.

The silica sol functions as a binder. Specifically, the silica sol reacts with water contained in the composition and a basic compound to form a Si-OH group on the surface of the metal oxide particle to be dispersed as nano-sized particles, and is present between the metal oxide particles, Function. In addition, the silica sol functions to increase the adhesion of the ceramic composition and improve the drying speed. The silica sol may be included in an amount of 32 to 55% by weight based on the total composition. Here, when the content of the silica sol is less than 32% by weight, there is a possibility that it can not withstand sulfuric acid, and when the content of the silica sol is more than 55% by weight, cracks may occur.

The clay zeolite is a zeolite obtained by hydrothermal synthesis of scoria, and zeolite is hydrous silicate mineral containing sodium and aluminum. It is colorless or white with glassy luster and usually fills in hollow holes or cracks in basalt or tuff. Chava site, Natrolite, and so on. The scoria is preferably a natural ceramic charcoal which is naturally fired by a high temperature of 1600 ° C in the eruption of volcanoes millions of years ago in the name of Jeju Island, Natural minerals with the mysterious effect of. Jeju Island Songyi is a substance known to be very good in physicochemical properties and is classified as a preservation resource under the special law of Jeju Island and is prohibited from being exported. Sodium hydroxide solution is added to the clusters and the mixture is stirred sufficiently. Then, hydrothermal synthesis is carried out in a high pressure reactor for a suitable period of time to obtain five or more clustered zeolites having high cation exchange capacity (CEC). It has the effect of inhibiting the growth of bacteria instead of promoting the growth of the organism. The content of natural titanium dioxide (TiO2), which is a photocatalyst material, is 3% ~ 10%, which is excellent in heavy metal adsorption and excellent in toxic removal. Especially, it can be said that it is a weakly alkaline material excellent in indoor air purification effect and excellent in anion and far-infrared radiation dose.

The zinc oxide serves to strengthen the surface strength. Specifically, the strengthened surface strength can be obtained by including zinc ions as the metal in the strength of the silica sol. The zinc oxide may be contained in an amount of 13 to 19% by weight. If the amount of zinc oxide is less than 13% by weight, the surface strength can not be obtained. If the amount of zinc oxide is more than 19% by weight, storage stability may be deteriorated.

The sodium hydroxide functions to form a stable coating film by reacting with a silica sol which can not form a coating film on its own. And 9 to 13% by weight based on the silica sol. If the sodium hydroxide content is less than 9% by weight, cracking may occur during curing. If the sodium hydroxide content is more than 13% by weight, water resistance can not be secured.

The repair method for a concrete structure having excellent chemical resistance according to the present invention includes a binder manufacturing step 10, a step 20 for obtaining a repair material for a concrete structure, a step 30 for obtaining a repairing reinforcement 30, (50) of applying and curing a repair material for a concrete structure to a repair section, and spraying and drying (60) a repair reinforcement on the repair section.

In the binder manufacturing step 10, 8 to 30% by weight of the slag-containing mixture, 1 to 6% by weight of the gypsum and 50 to 75% by weight of the magnesia phosphate cement are mixed and pulverized in a vibrating mill to produce an average particle size of 10 to 20 μm 15 to 60% by weight of cemented cement, 40 to 60% by weight of ordinary portland cement, and 0.1 to 2% by weight of jute fibers.

When these components are included in a predetermined content range, they have properties as excellent binders such as minimization of change in solidification time, strength, and physical properties of a repair material for a concrete structure.

The slag-containing mixture is a mixture containing residues generated in a steelmaking process for smelting iron, and can be used as a functional material constituting a concrete composition, thereby enhancing the strength of concrete and being resistant to chemical corrosion , The quality can be increased and the by-product of steel can be recycled, thereby increasing the added value. In addition, the amount of natural aggregate can be reduced when used as an aggregate, thereby reducing the cost cost. Such a slag-containing mixture forms the thickness of the mortar and serves to enhance the long-term strength by latent hydraulic reaction. The blast furnace slag-containing mixture used in the present invention preferably has a blast furnace slag content of about 6,000 cm < ² > / g or more and an average particle size of 5 mu m or less. In the present invention, the slag-containing mixture is preferably contained in a range of 8 to 30% by weight.

The chemical composition of the gypsum (gypsum) is CaSO ₄ .2H ₂ O. In the embodiment of the present invention, the CaSO ₄ component reacts with water to elute sulfate such as SO 4 ^2- to destroy the amorphous film of the blast furnace slag fine powder, thereby facilitating elution of Ca ^{2 +} , Al ^{2 +,} etc., Cations start to form due to the formation of CaO-SiO ₂ -H ₂ O-based hydrates and the like, and the surplus sulfur oxides are converted into nitrate hydrates (3CaO-Al ₂ O ₃ -CaSO ₄ -12H ₂ O ), Thereby making the structure inside the hydrated body densified. The gypsum includes a semi-gypsum or an alumite. The gypsum comprises 30 to 45 wt% of CaO, 30 to 65 wt% of SO3, and the balance of water (H ₂ O). The gypsum is preferably 1 wt% to 6 wt% based on 100 wt% of the total concrete composition. If the content of gypsum is less than 1% by weight, the effect is insignificant against the breakage of the blast furnace slag fine powder. If the content of gypsum exceeds 6% by weight, the wettability of the ettringite hydrate (3CaO-Al ₂ O ₃ -CaSO ₄ -12H ₂ O ) May cause an expansion crack of the cured body.

The magnesium cobalt phosphate cement is a cement which is a combination of magnesia and phosphate and has an advantage of excellent adhesion stability to base material concrete, good workability, sufficient time for work, good strength development at low temperature and excellent workability. When water is added to the mixture of magnesia and ammonium phosphate powder (NH2P), it shows very toughness. However, since it is not workable in this state and can not be used as cement, it can be used as a cement material by delaying the purity thereof It is necessary to use a coagulation retardant (citric acid, sodium borate).

The ordinary portland cement is a typical hydraulic cement which is sufficiently mixed with a raw material containing a silica, alumina, iron oxide, and lime (usually limestone, clay or marble, or a pyrite sinter) as a main component at a suitable ratio, An appropriate amount of gypsum is added to the calcined clinker to be pulverized to obtain a powder. Usually Portland cement, rapid cement Portland cement, middle heat cement Portland cement and so on. When the amount of the portland cement is less than 40% by weight, productivity is deteriorated due to the lack of demoulding strength. When the amount of the cement is less than 40% by weight, relatively different materials are insufficient and sufficient chemical resistance or water resistance is deteriorated.

The jute fiber is a perennial plant of the dicotyledonous plant, the dicotyledonous plant, and the jute fiber reinforcement is a natural cellulosic hydrophilic stiffener. When dispersed in water, Since the surface roughness is high, the structural reinforcement is superior to the existing hydrophobic synthetic fiber reinforcement. The most important feature of jute fibers is high water content (10 ~ 10%), and it is possible to prevent curing failure at the new-spherical interface, which is the most problem of installation defect of concrete section repair material. When hydrophobic conventional artificial fibers are used as reinforcements, the cross-sectional repair material absorbs the moisture from the dry part of the dried concrete structure. As a result, the concrete cross-section repair material rapidly becomes in a state of being dried and coagulated (the cement is present in the form of powder with no coalescence), and the interfacial adhesion with the concrete before the maintenance is lowered, A phenomenon appears. Jute fiber absorbs a large amount of water during the curing process and maintains water retention by supplying water to the curing material during the curing period, thereby giving a good amount of production. The jute fibers used in the repairing material of the present invention have an average thickness of 65 μm to 75 μm and an average length of 3 mm to 6 mm. As a result of the experiment, it was found that the dispersibility and workability were excellent within this range.

Preferably, the binder comprises 15 to 60 wt% of the repair material of the concrete structure. If it is used in an amount less than 15% by weight, the initial strength is lowered and the adhesive strength is lowered. If it is more than 60% by weight, initial cracking may occur due to rapid curing and high hydration heat.

The step (20) of obtaining the repair material for the concrete structure comprises the step of adding 10 to 40% by weight of limestone as a filler and 15 to 55% by weight of silica sand having an average particle size of 0.2 to 2.5 mm as an aggregate to 5 to 50% To obtain a repair material for a concrete structure.

The filler is preferably used in a range of 10 to 40% by weight of limestone. If it is less than 10% by weight, the effect of suppressing the shrinkage of the cured product is insignificant and the amount of shrinkage may increase. If it exceeds 40% by weight, the amount of filler may become excessive and the fluidity and workability may be deteriorated.

As the aggregate, silica sand is suitable and includes 20 to 55 wt% of silica sand having an average particle diameter of 0.2 mm to 2.5 mm. Silica sand is a quartz sand with a high silica content (SiO2, SiO2), glass raw materials, foundry sand and other industrial raw materials. Silica is sand composed of only the quartz remains or transported due to weathering of other minerals. High grade silica sand is used in the production of glass and porcelain. In addition, it is used as a raw material for silicon metal, for electronic industry, steel industry, casting industry, ceramics industry, abrasive material. It has excellent acid and alkali resistance, heat resistance and high strength. It is used for various purposes such as filling materials for LCD materials, paints, plastics, and ceramics. Such silica sand increases strength and improves fillability, while preventing the filler mixture from flowing down to the lower void, and is also economical because of their low cost. The amount of the filler is 20 to 55% by weight. When the filler is used in an amount less than 20% by weight, the filler mixture may penetrate to the lower layer more than necessary. When the filler content is more than 55% by weight, This is because of concerns.

The step 30 of obtaining the repair reinforcement material comprises 18 to 23 wt% of triethoxysilane, 5 to 8 wt% of isopropanol, 32 to 55 wt% of silica sol, 16 to 21 wt% of pine zeolite, 13 to 26 wt% of purified water, 0.1 to 0.3% by weight of zinc oxide and 9 to 15% by weight of sodium hydroxide, and stirring the mixture for 80 to 90 minutes while heating at a temperature of 50 to 80 ° C to obtain a repair reinforcement material.

The step of repairing the repair section (40) is a process of repairing the repair section until the damaged part of the damaged concrete structure is chipped and the undamaged portion comes out.

The step (50) of applying and curing the repair material for the concrete structure is a process of applying and curing the repair material for the concrete structure obtained in the step (20) of obtaining the repair material for the concrete structure on the trimmed repair section.

The step 60 of spraying and drying the repair reinforcement material is a process of spraying and drying the repair reinforcement material obtained in step 30 of applying the repair material for the concrete structure and obtaining the repair reinforcement material on the cured repair section.

Hereinafter, a method for repairing a concrete structure having excellent chemical resistance according to the present invention will be described in detail with reference to examples.

<Examples>

First, a mixture composed of 26% by weight of a slag-containing mixture, 4% by weight of gypsum and 70% by weight of magnesia phosphate cement was mixed and pulverized in an oscillating mill so as to have an average particle size of 10 to 20 μm, (10) for producing a binder by mixing 54.8% by weight of cement with 45% by weight of ordinary Portland cement, 75% by weight and 0.2% by weight of jute fibers having a length of 6 mm,

20% by weight of limestone as a filler and 35% by weight of silica sand having an average particle diameter of 0.2 mm to 2.5 mm as an aggregate are mixed with 45% by weight of the binder obtained through the binder manufacturing step 10 to obtain a repair material for a concrete structure ).

For the performance test, after adding 0.5 wt% of dispersant, 0.2 wt% of defoamer and 0.05 wt% of retarder to 83.25 wt% of the above-mentioned repair material, 16 wt% of water was mixed and cured, and various properties were measured by KSF4042 test method As a result of the evaluation, the compressive strength (MPa) 40, the flexural strength (MPa) 8.2, the adhesion strength (MPa) 1.5, the alkaline compressive strength 40 MPa, the neutralization resistance (mm) 1.5, ² h ^0.5 ) of 0.20, moisture permeation resistance (sd) of 0.4, chloride penetration resistance (coulombs) of 635, and length change rate of -0.001.

Subsequently, 35% by weight of silica sol and 15% by weight of purified water were mixed and heated to 80 DEG C, 9% by weight of sodium hydroxide and 0.3% by weight of zinc oxide were mixed and sodium hydroxide and zinc oxide dissolved (30) to obtain a liquid-phase repair reinforcement material by stirring at 80 ° C for 90 minutes, adding 18.7% by weight of triethoxysilane, 6% by weight of isopropanol and 16% by weight of Songye Zeolite, .

Next, a step 40 of repairing the repair section is performed until the damaged surface of the damaged concrete structure is chipped and the undamaged portion comes out.

The step 50 of applying and curing the repair material for the concrete structure obtained in the step (20) of obtaining the repair material for the concrete structure on the trimmed repair section was performed.

Next, a step 60 of spraying and drying the repair reinforcement material obtained in the step 30 of applying the repair material for the concrete structure and obtaining the repairing reinforcement material on the cured repair section was performed.

Since the repair section of the embodiment of the present invention is stiffened by the repair reinforcement material, it has excellent chemical resistance that almost no corrosion is seen even when sulfuric acid is applied from the outside.

10: Binder manufacturing step
20: Steps to obtain repair material
30: Step of obtaining a repair stiffener
40: Step of trim repair section
50: Step of applying and curing the repair material
60: Spraying and drying the repair reinforcement

Claims (2)

A mixture of 18-20 wt% triethoxysilane, 5-7 wt% isopropanol, 32-38 wt% silica sol, 16-19 wt% pine zeolite, 13-20 wt% purified water, 0.2-0.3 wt% zinc oxide, and sodium hydroxide 9 to 12% by weight based on the total weight of the concrete reinforcement. 15 to 59% by weight of a hydrous cement having an average particle size of 10 to 20 μm by mixing and pulverizing 8 to 30% by weight of the slag-containing mixture, 1 to 6% by weight of gypsum and 50 to 75% by weight of magnesia- A binder material manufacturing step (10) in which 40 to 50% by weight of portland cement and 0.1 to 2% by weight of jute fibers are mixed;
10 to 40 wt% of limestone as a filler and 15 to 55 wt% of silica sand having an average particle diameter of 0.2 to 2.5 mm as an aggregate are mixed with 5 to 50 wt% of the prepared binder to obtain a repair material for a concrete structure (20);
A mixture of 18-20 wt% triethoxysilane, 5-7 wt% isopropanol, 32-38 wt% silica sol, 16-19 wt% pine zeolite, 13-20 wt% purified water, 0.2-0.3 wt% zinc oxide, and sodium hydroxide Mixing 9 to 12% by weight of the mixture and heating the mixture at a temperature of 50 to 80 ° C. for 80 to 90 minutes to obtain a repair reinforcement (30);
Chipping the target surface of the damaged concrete structure to polish the repair section until an undamaged portion is obtained (40);
(50) applying and curing the repair material for the concrete structure to the trimmed section; And
(60) applying the repair material for the concrete structure and spraying and drying the repair reinforcement material on the cured repair surface.

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