KR102638757B1 - Repair composition containing graphene oxide for concrete structure and repairing method for concrete structure using the same - Google Patents

Abstract

The present invention is a repair material composition for concrete structures containing cement and aggregate, and includes 0.01 to 0.3 parts by weight of graphene oxide based on 100 parts by weight of solid content, a compound represented by Formula 1, a compound represented by Formula 2, and a compound represented by Formula 3. It is characterized in that it further comprises 0.1 to 0.2 parts by weight of each compound and 0.05 to 0.1 parts by weight of the compound represented by Formula 5.
When repairing a repair material composition containing these compounds by pouring it into a concrete structure to be repaired, graphene oxide prevents neutralization of the concrete and improves the bending strength, and the compounds with a rigid chemical structure are especially hardened by ultraviolet rays on the surface of the repair layer. Forms a water-retaining layer with increased compressive strength.

Description

Repair composition for concrete structures containing graphene oxide and repair method for concrete structures {REPAIR COMPOSITION CONTAINING GRAPHENE OXIDE FOR CONCRETE STRUCTURE AND REPAIRING METHOD FOR CONCRETE STRUCTURE USING THE SAME}

The present invention relates to a repair material composition used to repair concrete structures and a repair method for concrete structures using the same.

Concrete structures are structures formed primarily from cement, and cement is a hydraulic material that creates a stable substance through a hydration reaction with water. In this hydration reaction, calcium hydroxide equivalent to about 1/3 of the amount of cement is produced. Calcium hydroxide, which has a strong alkaline pH of about 12 to 13, creates a passive film around the reinforcing bars inside the structure, thereby preventing the reinforcing bars from corroding and maintaining the strength of the structure.

However, due to the nature of concrete structures, many micro cracks occur during the initial curing process. When water penetrates between cracks, the cracking of the concrete structure is accelerated due to repeated freezing and thawing of water due to temperature changes, and durability is significantly reduced.

In particular, when acidic substances such as carbon dioxide, which is on the rise due to flying salt or air pollution, invade the inside of the concrete structure, salt damage and neutralization of the concrete structure progress, causing corrosion of the rebar buried inside to maintain the strength of the concrete structure. promote In other words, as the acid reacts with calcium hydroxide in the cement hydrate, the pH of the concrete structure is lowered to 10 or less, and the passive film around the internal reinforcing steel structure is destroyed, causing the structure to deteriorate due to reinforcing bar corrosion. When reinforcing bars corrode, their volume increases. The increase in the volume of the reinforcing bars acts as a tensile force on the surface of the structure, weakening the strength of the structure by further growing cracks on the surface.

As the deterioration of concrete progresses due to physical and chemical environmental conditions, extensive repairs to concrete structures are required.

Various repair compositions are used as a method for repairing concrete structures. In particular, repair mortar made of aggregate such as silica sand and cement as a binder as basic repair material components does not have sufficient flexural or compressive strength, so there is a problem in that moisture penetrates over time after construction and deteriorates the concrete structure and repair mortar. .

Therefore, the technical problem to be achieved by the present invention is to solve the above-mentioned problems and provide a repair composition for concrete structures that can prevent neutralization of concrete and improve flexural and compressive strength after construction of a concrete repair material composition containing cement and aggregate. It is provided.

Another technical problem to be achieved by the present invention is to provide a repair method for concrete structures that can prevent neutralization of concrete and improve flexural and compressive strength after construction.

In order to solve the above technical problem, the concrete repair material composition containing cement and aggregate according to the present invention is based on 100 parts by weight of solid content,

0.01 to 0.3 parts by weight of graphene oxide,

0.1 to 0.2 parts by weight of a compound represented by the following formula (1),

0.1 to 0.2 parts by weight of a compound represented by the following formula (2) and

It contains 0.1 to 0.2 parts by weight of a compound represented by the following formula (3).

<Formula 1>

<Formula 2>

<Formula 3>

In the concrete repair material composition of the present invention, the repair material composition may further include 0.05 to 0.1 parts by weight of a compound represented by the following formula (4) based on 100 parts by weight of solid content.

<Formula 4>

The concrete repair material composition of the present invention,

30 to 40 parts by weight of one type of ordinary Portland cement;

2 to 6 parts by weight of calcium aluminate cement;

2 to 5 parts by weight of alumina cement;

2 to 5 parts by weight of calcium sulfonate;

5 to 10 parts by weight of silica sand having an average particle diameter of 0.1 to 0.2 mm;

25 to 35 parts by weight of silica sand having an average particle diameter of 0.3 to 0.6 mm;

16 to 20 parts by weight of silica sand having an average particle diameter of 0.7 to 1.2 mm;

5 to 10 parts by weight of pozzolan powder;

0.4 to 0.8 parts by weight of alkylalkoxysilane;

0.1 to 0.3 parts by weight of staple cellulose fibers;

0.01 to 0.3 parts by weight of graphene oxide;

0.1 to 0.2 parts by weight of a compound represented by the following formula (1);

0.1 to 0.2 parts by weight of a compound represented by the following formula (2); and

It may contain 0.1 to 0.2 parts by weight of a compound represented by the following formula (3),

<Formula 1>

<Formula 2>

<Formula 3>

Preferably, based on 100 parts by weight of solid content, it may further include 0.05 to 0.1 parts by weight of a compound represented by the following formula (4).

<Formula 4>

In addition, the present invention provides a concrete structure repair method for repairing the concrete structure by pouring the above-described concrete repair material composition into the concrete structure to be repaired.

When the concrete repair material composition according to the present invention is poured into a concrete structure to be repaired and repaired, graphene oxide prevents neutralization of the concrete and improves its bending strength, thereby improving brittleness that is prone to vibration or cracking.

In addition, the compounds of Formula 1-2, which have a rigid chemical structure represented by the above-mentioned chemical formulas, can be cured by ultraviolet rays, especially on the surface of the water retention layer, to form a water retention layer with increased compressive strength. In addition, the compound of formula 3 further improves the strength of the concrete of the repair composition.

Hereinafter, the present invention will be described in detail. Prior to this, the terms or words used in this specification and claims should not be construed as limited to their usual or dictionary meanings, and the inventor should appropriately use the concept of terms to explain his or her invention in the best way. It must be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle of definability.

According to the present invention, the repair composition for concrete structures containing cement and aggregate is based on 100 parts by weight of solid content,

0.01 to 0.3 parts by weight of graphene oxide,

0.1 to 0.2 parts by weight of a compound represented by the following formula (1),

0.1 to 0.2 parts by weight of a compound represented by the following formula (2) and

It contains 0.1 to 0.2 parts by weight of a compound represented by the following formula (3).

<Formula 1>

<Formula 2>

<Formula 3>

As is known, graphene oxide has a structure in which oxygen is substituted by oxidizing the surface by adding acid and reacting when producing graphene, and has a carboxyl group on the surface. Accordingly, it is resistant to salt water and has alkaline properties, so it forms hydroxide when reacting with water, preventing neutralization of concrete. In addition, graphene oxide is light and strong, so it can improve bending strength by improving sagging or flow due to gravity.

In addition, the compounds represented by Chemical Formula 1 and Chemical Formula 2 have a rigid chemical structure, and these compounds cause a hardening reaction especially on the surface of the water-retaining layer by artificial or solar ultraviolet rays and become hard, creating a water-retaining layer with increased compressive strength. contributes to forming In addition, the compound represented by Formula 3 further improves the strength of the water retention layer.

In the concrete repair material composition of the present invention, the repair material composition may further include 0.05 to 0.1 parts by weight of a compound represented by the following formula (4) based on 100 parts by weight of solid content.

<Formula 4>

In addition, in the concrete repair material composition of the present invention, the above-mentioned effect can be further increased if the repair material composition further includes 0.05 to 0.1 parts by weight of a compound represented by the following formula (5) based on 100 parts by weight of solid content.

<Formula 5>

These compounds represented by Formulas 4 and 5 also have a rigid chemical structure, and these compounds become strong by hardening by artificial ultraviolet light or ultraviolet rays from sunlight, especially on the surface of the water-retaining layer, so the compounds of Formulas 1 and 2 When used in combination with a compound, it contributes to forming a water-retaining layer with further increased compressive strength.

In particular, the compound represented by Formula 5 has an H-shaped rigid chemical structure, so the above-described effect can be further increased.

In addition to the components described above, the components of the repair material composition for concrete structures are explained as follows.

cement

The repair composition for concrete structures of the present invention uses cement as a binder. As cement, it is preferable to use one type of ordinary Portland cement, potassium aluminate cement, and alumina cement at the same time.

*More specifically, it can be used in a ratio of 30 to 40 parts by weight of (b) ordinary Portland cement, (b) 2 to 6 parts by weight of calcium aluminate cement, and 2 to 5 parts by weight of alumina cement, and 2 to 5 parts by weight of calcium sulfonate. You can add more wealth. When these ingredients are included in a set content range, they exhibit excellent properties as a binder, such as minimizing physical property changes due to the setting time, strength, and expansion and contraction of the repair material.

aggregate

The repair composition for concrete structures of the present invention may use silica sand as an aggregate, but is not limited thereto.

More specifically, 5 to 10 parts by weight of silica sand with an average particle diameter of 0.1 to 0.2 mm, 25 to 35 parts by weight of silica sand with an average particle diameter of 0.3 to 0.6 mm, and 16 to 20 parts by weight of silica sand with an average particle diameter of 0.7 to 1.2 mm. It can be used in proportions of parts by weight. In this way, it was confirmed that by mixing silica sand with different particle sizes, the pores were controlled and the framework was stabilized after the repair material was installed.

Functional materials department

The concrete cross-section repair material composition of the present invention is a functional material for providing a specific function to the repair material, and may further include 5 to 10 parts by weight of pozzolan powder, 0.4 to 0.8 parts by weight of alkylalkoxysilane, and 0.3 parts by weight of staple fiber. .

Pozzolan powder contributes to the development of initial and long-term strength of the repair material by promoting the creation of ettringite through a hydration reaction due to hardening during curing after construction of the cross-section repair material within the above-mentioned content ratio.

Alkylalkoxysilane is a compound containing hydrophobic hydrocarbon groups such as methyl group and phenol group. The hydrolyzable alkoxy group is hydrolyzed by water or moisture in the repair material composition to produce silanol, and silanol combines with the surface of the inorganic material to form an oxane bond. By forming, the concrete pores or capillary surfaces are silanized to block the penetration of water and air.

As staple cellulose fibers, cellulose fibers with an average length of 1 to 20 cm can be used, for example, jute fibers, wood pulp, etc. Cellulose fiber is a hydrophilic reinforcing material and has excellent dispersibility when mixed, so fiber agglomeration due to material separation rarely occurs during concrete repair. Since it has a high surface roughness, it has better structural reinforcing properties than existing hydrophobic artificial fiber reinforcing materials. In particular, natural cellulose fiber has a high moisture content, so it can prevent curing failure at the new-old interface that occurs when the repair material of a concrete structure is poorly constructed.

Since graphene oxide and compounds represented by chemical formulas have been described in detail above, further description is omitted.

As described above, the most preferred concrete repair material composition of the present invention includes 30 to 40 parts by weight of one type of ordinary Portland cement; 2 to 6 parts by weight of calcium aluminate cement; 2 to 5 parts by weight of alumina cement; 2 to 5 parts by weight of calcium sulfonate; 5 to 10 parts by weight of silica sand having an average particle diameter of 0.1 to 0.2 mm; 25 to 35 parts by weight of silica sand having an average particle diameter of 0.3 to 0.6 mm; 16 to 20 parts by weight of silica sand having an average particle diameter of 0.7 to 1.2 mm; 5 to 10 parts by weight of pozzolan powder; 0.4 to 0.8 parts by weight of alkylalkoxysilane; 0.1 to 0.3 parts by weight of staple fiber; 0.01 to 0.3 parts by weight of graphene oxide; It may contain 0.1 to 0.2 parts by weight of each of the above-mentioned compounds represented by Formula 1 and Formula 2, and may further include 0.1 to 0.5 parts by weight of tartanic acid and 0.3 to 0.6 parts by weight of lithium carbonate, represented by Formula 3. It may further include 0.05 to 0.1 parts by weight of the compound represented by Formula 4, and may further include 0.05 to 0.1 parts by weight of the compound represented by Formula 4. In addition, of course, resins used in cement-based repair material compositions, melt-based fluidizing agents, thickening stabilizers, etc. may be further included.

The repair composition for concrete structures of the present invention can be prepared by first mixing cement, aggregate and basalt powder, then dissolving the chemical compounds in a solvent, mixing and drying (a further grinding process may be performed if necessary). The repair material composition prepared in this way can be mixed with water and constructed according to a typical concrete structure repair method.

After construction, the compounds indicated by the chemical formula can be cured using an ultraviolet ray generator, but they can be gradually cured by the ultraviolet rays contained in sunlight.

Hereinafter, the present invention will be described in detail with reference to examples. However, the embodiments according to the present invention may be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

[Synthesis of Formula 1 Compound]

The following compounds were synthesized by the method shown below.

10.08 g (45.4 mmol) of tert-butyl 4-hydroxycinnamic acid (1-c-43a), 100 ml of N,N-dimethylformamide, and 9.4 g of potassium carbonate were added to a 300 ml four-necked flask and stirred for 10 minutes. 10.1 g (53 mmol) of 6-chlorhexyl acrylate was added to this mixture, and the mixture was stirred at 90°C for 6 hours. This reaction mixture was cooled to 10°C, 100 ml of water was added, and stirred for 1 hour. This mixture was filtered to obtain the crude product as a solid. This solid was dissolved in 25 ml of acetone, added dropwise to 45 ml of methanol, and cooled to 0°C. The generated solid was filtered, dissolved again in 12 ml of acetone, added dropwise to 25 ml of hexane, and cooled to 0°C. By filtering and drying the obtained solid, 8.56 g of compound 1-1 was obtained (yield 50%).

8.5 g of Compound 1-1 and 22 ml of dichloromethane were added to a 200 ml three-necked flask and stirred. 22 ml of formic acid was added dropwise to this mixture and stirred at 40°C for 5 hours. This reaction mixture was cooled to below 30 degrees, and 50 ml of dichloromethane was added. The organic layer was separated and washed four times with 70 ml of water and once with 70 ml of saturated saline solution. The obtained solution was dried with sodium sulfate. After the sodium sulfate was filtered off, the solvent was distilled off. 10 ml of hexane and 4 ml of toluene were added to the obtained solid and stirred at room temperature for 30 minutes. This mixture was filtered and dried to obtain 6.30 g of compound 1-2 (yield 87%).

In a 100 ml three-necked flask, 1.31 g of 2,5-dihydroxybenzaldehyde, 25 ml of dichloromethane, 6.05 g of Compound 1-2, and 0.07 g of N,N-dimethylaminopyridine were added and stirred at 5°C for 10 minutes. Into this mixture, 2.98 g of N,N-diisopropylcarbodiimide was added dropwise while maintaining the temperature at 10 degrees Celsius or lower, and stirred at 30 degrees Celsius for 6 hours. After adding 0.08 ml of water to this reaction mixture, the solid was removed by filtration. After passing the obtained solution through a column (silica gel + alumina, dichloromethane), the solvent was distilled off. The obtained solid was dissolved in 10 ml of acetone, added dropwise to 30 ml of methanol, and cooled to 0°C. By filtering and drying the obtained solid, 4.80 g of compound 1-3 was obtained (yield 69%).

4.8 g of compound 1-3, 1.07 g of 2-hydrazinobenzothiazole, and 20 ml of tetrahydrofuran were added to a 100 ml three-necked flask, and stirred at 50°C for 15 hours. This reaction mixture was cooled to room temperature, and the precipitated solid was filtered. The obtained solid was purified by silica gel column chromatography (dichloromethane/ethyl acetate = 10/1). The solution after passing through the column was filtered and dried to obtain 2.40 g of the compound of Formula 1.

^1H NMR(CDCl ₃ )δ: 1.41-1.61(p, 8H), 1.65-1.80(p, 4H), 1.7(br, 1H), 1.80-1.97(p, 4H), 4.02(t, 2H), 4.17(t, 2H), 5.82(d, 2H), 6.10-6.18(dd, 2H), 6.39-6.44(s+d, 3H), 6.93(dd, 4H), 7.09(t, 2H), 7.23( s, 1H), 7.30(d, 1H), 7.43(d, 1H), 7.50-7.58(p, 4H), 7.75-7.89(p, 3H), 8.10(s, 1H).

LC-MS: m/z 885.61[M+]

[Synthesis of Formula 2 compound]

The following compounds were synthesized by the method shown below.

The following compounds were synthesized by the method shown below.

in the reaction vessel , Potassium carbonate, ethanol, and tetrakis(triphenylphosphine)palladium(0) were added and heated and stirred. After performing normal post-processing, purification was performed by column chromatography and recrystallization. Compound 2-1 was obtained.

in the reaction vessel , , N,N-dimethylaminopyridine, and dichloromethane were added. Then, diisopropylcarbodiimide was added and stirred. After performing normal post-processing, purification was performed by column chromatography and recrystallization. Compound 2-2 represented by was obtained.

Compounds 2-1, 2-2, hydrazine monohydrate, and ethanol were added to the reaction vessel and heated and stirred. After performing the usual post-treatment, the product was purified by column chromatography to obtain the compound represented by Formula 2.

MS(m/z):853[M++1]

[Synthesis of compound of formula 3]

The following compounds were synthesized by the method shown below.

Phosphoryl trichloride (1.27 g, 8.3 mmol) was slowly added dropwise to 10 ml of DMF at 0°C under a nitrogen atmosphere, and then stirred for 1 hour. Cyeno[2,3-d]thiazol-2-amine (1 g, 6.4 mmol) was added thereto, heated to 80°C, and stirred to proceed with the reaction. Next, the temperature was lowered to room temperature and 30 ml of water was added to terminate the reaction. 30 ml of 1N NaOH was added to the resulting solid, then 50 ml of chloroform was added again to dissolve it, washed twice with water, the organic layer was separated, anhydrous magnesium sulfate was added, stirred, filtered, and the filtrate was distilled under reduced pressure. The concentrated compound was purified through a silica column using chloroform and E-K aceate to prepare solid intermediate 3-1 (0.91 g, 77%, MS: [M+H]+ = 184.0).

At 0°C, Intermediate 3-1 (1 g, 5.4 mmol) was added to 3 ml of acetic acid and 7 ml of propionic acid and stirred for 30 minutes. Sodium nitrite (0.39 g, 5.7 mmol) was dissolved in 16 ml of sulfuric acid, slowly added dropwise, and stirred for 30 minutes while maintaining the temperature below 5°C. N,N-diethylaniline (1.2 g, 8.1 mmol) was dissolved in 5 ml of methanol, slowly added dropwise, and stirred for 2 hours. At this time, the pH was titrated with 2N sodium acetate solution to maintain the pH between 5-7. After completion of the reaction, the mixture was filtered and washed twice with water and methanol to prepare solid intermediate 3-2 (1.4 g, 75%, MS: [M+H]+ = 345.1).

Intermediate 3-2 (0.5 g, 1.5 mmol) and 2-(4-butoxyphenyl)acetonitrile (0.33 g, 1.7 mmol) were dissolved in 10ml of ethanol. After adding 5 mol% of piperidine to this mixture solution, it was refluxed for 2 hours. After lowering the temperature of the reaction mixture to room temperature, the resulting solid was extracted three times using 20 ml of chloroform and 20 ml of water. After removing the water with magnesium sulfate and evaporating the solvent, the compound of Formula 3 (0.45 g, 60%, MS: [M+H]+ = 515.3) was purified through a silica column using chloroform and E?K aceate. was manufactured.

[Synthesis of compound of formula 4]

The following compounds were synthesized by the method shown below.

4-Bromobenzoic acid (50g), tert-butyl alcohol (20.3g), and dimethylaminopyridine (12.2g) were dissolved in dichloromethane, and diisopropylcarbodiimide (DIC, 37.7g) was added dropwise at 35°C. , stirred for 5 hours. The reaction solution was filtered, and the filtrate was concentrated. The solid was purified by column chromatography to obtain compound 4-1 (49 g).

Compound 4-1 (49 g) was dissolved in NMP, and potassium carbonate (34.2 g) and ethyl acrylate (24.8 g) were added. Nitrogen substitution was performed, palladium acetate (0.43 g) was added, and the mixture was heated and stirred at 110°C. After stirring for 4 hours, water (300 ml) was added, and extraction was performed with ethyl acetate. The organic layer was washed with 1% hydrochloric acid and saturated saline solution. It was dehydrated with sodium sulfate, and the organic layer was concentrated. The obtained compound was dissolved in 100 ml of ethanol, and potassium hydroxide (15.2 g), 50 ml of ethanol, and 50 ml of water were added. After stirring at room temperature for 5 hours, 100 ml of water was added and neutralized with hydrochloric acid. The aqueous layer was extracted with ethyl acetate and concentrated to obtain an oily solid (Compound 4-2, 14.7 g).

The obtained compound 4-2 was dissolved in dichloromethane, and DMAP (2.90 g), 4-hydroxybutylacrylate (10.3 g), and 400 ml of DMF were added. DIC (9.0 g) was slowly added dropwise at room temperature and stirred for 24 hours. Washed with water and extracted with dichloromethane. It was purified by silica gel column chromatography. Formic acid was added to the obtained oil-like compound, and the mixture was stirred at room temperature for 9 hours and 45°C for 4 hours. 100 ml of water was added to the reaction system, neutralized with sodium hydroxide, and then extracted with ethyl acetate. The organic layer was concentrated and dried to obtain compound 4-3 (6.5 g).

Compound 4-3 (6.5 g) was dissolved in 200 ml of dichloromethane, and DMAP (0.6 g) and dihydroxybenzaldehyde (1.2 g) were added. DIC (2.5 g) was added dropwise at room temperature and stirred for 10 hours. The reaction solution was filtered, and the organic layer was concentrated. The product was purified by silica gel column chromatography to obtain compound 4-4 (5 g).

Compound 4-4 (5 g) was dissolved in 50 ml of ethanol, benzothiazolehydrazine derivative was added, and the mixture was stirred at 45°C for 5 hours. When cooled to room temperature, a solid precipitated and was recovered by filtration. Purified by recrystallization, 3.5 g of the compound represented by Chemical Formula 4 was obtained.

[Synthesis of compound of formula 5]

The following compounds were synthesized by the method shown below.

In the reaction vessel , triethylamine, dichloromethane, and succinic acid chloride were added and stirred. After performing the usual post-treatment, the product was purified by column chromatography and recrystallization to obtain compound 5-1.

Compound 5-1 and dichloromethane were added to the reaction vessel. While cooling to -78°C, boron tribromide was added and stirred. After performing the usual post-treatment, the product was purified by column chromatography and recrystallization to obtain compound 5-2.

Compound 5-2 in a reaction vessel, , N,N-dimethylaminopyridine, and dichloromethane were added. Diisopropylcarbodiimide was added and stirred. After performing the usual post-treatment, the product was purified by column chromatography and recrystallization to obtain the compound of formula (5).

MS(m/z):1543[M++1]

<Example 1>

Preparation of composition

Type 1: 32 parts by weight of ordinary Portland cement, 2 parts by weight of calcium aluminate cement, 2 parts by weight of alumina cement, 3 parts by weight of calcium sulfonate, 8 parts by weight of silica sand (average particle diameter: 0.1 mm), silica sand (average particle diameter: 0.4 mm) 24.5 parts by weight, 18 parts by weight of silica sand (1.0 mm), 7 parts by weight of pozzolan powder (320~340 mesh), 0.6 parts by weight of ethyltrimethoxysilane, 0.2 parts by weight of cellulose fiber with an average thickness of 70 ㎛ and an average length of 5 mm. parts by weight, 0.1 parts by weight of tartanic acid, 0.3 parts by weight of lithium carbonate, 0.2 parts by weight of melt-based fluidizing agent, 2.0 parts by weight of WAKER Polymer (RE5010N), 0.1 parts by weight of thickening stabilizer, and graphene oxide (rGO-V50 from STANDARD GRAPHENE) 0.2 parts by weight and 0.15 parts by weight of the compound of Formula 3 were mixed.

Next, prepare a solution by adding 20% by weight of the compounds of Formula 1 and Formula 2 synthesized by the above method, 1% by weight of the photopolymerization initiator Irgacure907 (manufactured by BASF), 0.1% by weight of 4-methoxyphenol, and 80% by weight of chloroform. This was mixed with the above-mentioned mixture raw materials in a sealed environment (mixing the compounds of formulas 1 and 2 at a ratio of 0.15 parts by weight each based on 100 parts by weight of the mixture raw materials) and then dried to prepare a water repair composition.

Construction testing

For the performance test, 16 parts by weight of water were mixed with 100 parts by weight of the composition of the above-mentioned example, cured, irradiated with ultraviolet rays at an intensity of 40 mW/cm2 for 20 minutes using a high-pressure mercury lamp, and then subjected to various quality standards tests described below. Physical properties were evaluated. The results are shown in Tables 1 to 3.

<Example 2>

The compound of Chemical Formula 4 synthesized by the above method was further mixed at a ratio of 0.08 parts by weight based on 100 parts by weight of the mixture raw material and then dried to prepare a repair composition. It was prepared in the same manner as in Example 1, except that a construction test was performed. .

<Example 3>

The compound of Chemical Formula 5 synthesized by the above method was further mixed at a ratio of 0.08 parts by weight based on 100 parts by weight of the mixture raw material and then dried to prepare a repair composition. It was prepared in the same manner as in Example 2, except that a construction test was performed. .

Test Items KSF4042 quality standards Example 1 Example 2 Example 3 Compressive strength (MPa) 20.0 or higher 65 66 67 Bending strength (MPa) 6.0 or higher 10.2 10.3 10.7 Neutralization resistance (㎜) 2.0 and below 1.16 1.18 1.19

Microcrack prevention test items KS standard Physical properties of Examples 1, 2 and 3 Test standards Crack responsiveness (-20 ℃) No chipping or breakage clear KS F 4936 Crack responsiveness (20 ℃) No chipping or breakage clear

Test Items standard Physical properties of examples Test standards Contamination (soybean oil) No significant color, shine or puffiness clear KS M 3802:2014 Contamination (lubricating oil) No significant color, shine or puffiness clear Contamination (95% ethanol) No significant color, shine or puffiness clear Contamination (10% ammonia solution) No significant color, shine or puffiness clear Contamination (milk) No significant color, shine or puffiness clear Contamination (5% acetic acid) No significant color, shine or puffiness clear Contamination (5% hydrochloric acid) No significant color, shine or puffiness clear Contaminant (kerosene) No significant color, shine or puffiness clear Contamination (soy sauce) No significant color, shine or puffiness clear

Referring to the results in Tables 1 to 3, it can be seen that the repair material formed using the repair material composition for the concrete structure of the example has excellent compressive strength and bending strength as well as anti-neutralization performance.

Claims (5)

In a concrete repair material composition containing cement and aggregate,
The repair material composition is based on 100 parts by weight of solid content,
0.01 to 0.3 parts by weight of graphene oxide,
0.1 to 0.2 parts by weight of a compound represented by the following formula (1),
0.1 to 0.2 parts by weight of a compound represented by the following formula (2),
0.1 to 0.2 parts by weight of a compound represented by the following formula (3) and
A repair material composition for concrete structures, characterized in that it contains 0.05 to 0.1 parts by weight of a compound represented by the following formula (5):
<Formula 1>

<Formula 2>

<Formula 3>

<Formula 5>
In paragraph 1,
The repair material composition for a concrete structure further comprises 0.05 to 0.1 parts by weight of a compound represented by the following formula (4), based on 100 parts by weight of solid content:
<Formula 4>
Based on 100 parts by weight of solid content,
30 to 40 parts by weight of one type of ordinary Portland cement;
2 to 6 parts by weight of calcium aluminate cement;
2 to 5 parts by weight of alumina cement;
2 to 5 parts by weight of calcium sulfonate;
5 to 10 parts by weight of silica sand having an average particle diameter of 0.1 to 0.2 mm;
25 to 35 parts by weight of silica sand having an average particle diameter of 0.3 to 0.6 mm;
16 to 20 parts by weight of silica sand having an average particle diameter of 0.7 to 1.2 mm;
5 to 10 parts by weight of pozzolan powder;
0.4 to 0.8 parts by weight of alkylalkoxysilane;
0.1 to 0.3 parts by weight of staple cellulose fibers;
0.01 to 0.3 parts by weight of graphene oxide;
0.1 to 0.2 parts by weight of a compound represented by the following formula (1);
0.1 to 0.2 parts by weight of a compound represented by the following formula (2);
0.1 to 0.2 parts by weight of a compound represented by the following formula (3); and
A repair material composition for concrete structures, characterized in that it contains 0.05 to 0.1 parts by weight of a compound represented by the following formula (5):
<Formula 1>

<Formula 2>

<Formula 3>

<Formula 5>
According to paragraph 3,
The repair material composition for concrete structures further comprises 0.05 to 0.1 parts by weight of a compound represented by the following formula (4) based on 100 parts by weight of solid content.
<Formula 4>
A repair method for a concrete structure in which the cross-section is repaired by pouring the repair composition of any one of paragraphs 1 to 4 into the concrete structure.