KR102415406B1 - Concrete repair and reinforcement composition and concrete repair and reinforcement method using it - Google Patents

Abstract

The present invention relates to a concrete repair and reinforcement composition and a concrete repair and reinforcement method using the same, and more specifically, to give water resistance to the surface of an aged concrete structure to strengthen adhesion, and to have a waterproof and anticorrosive function, It has the effect of preventing corrosion or structural damage caused by sulfuric acid, hydrochloric acid and chlorine.

Description

Concrete repair and reinforcement composition and concrete repair reinforcement method using the same {Concrete repair and reinforcement composition and concrete repair and reinforcement method using it}

The present invention relates to a concrete repair and reinforcement composition and a concrete repair and reinforcement method using the same. More specifically, it satisfies the compressive strength of an aged concrete structure, strengthens adhesion by giving water resistance, and has a waterproof function. It relates to a concrete repair and reinforcement composition capable of preventing corrosion or structural damage caused by sulfuric acid, hydrochloric acid and chlorine, and a concrete repair and reinforcement method using the same.

Concrete structures are constructed so that most of the surfaces are exposed to the outside, and as time goes by, they deteriorate and the aesthetics deteriorate. In civil engineering or buildings, it is classified into roof, indoor, water current and underground waterproofing and implemented in various ways.

Such a conventional waterproofing construction has used a method of adding a waterproofing solution during the aging of concrete to make waterproofing, or using a waterproofing solution to laminate and then finish using a sheet.

However, such waterproof construction has a problem in that odor is generated and the waterproof effect is deteriorated due to aging of the waterproofing layer as time goes by, as well as being exposed to the risk of fire.

In addition, in the case of waterproofing using a sheet, partial leakage occurs as the sheet falls off, and if the concrete cracks due to vibration or distortion of the earth's crust, the effect of waterproofing is remarkably reduced.

Therefore, according to the conventional waterproofing construction as described above, partial repair work must be done after about 1 to 2 years, and it is almost impossible to completely waterproof the leaked part even by such repair work.

In addition, conventional inorganic waterproof paints have only a waterproof function by mixing cement, sand, and methyl cellulose and applying them with water or a water-soluble adhesive. In particular, when using this method to apply the existing inorganic waterproofing paint to a water and sewage structure composed of concrete, since there is no antibacterial action in the water or sludge freshwater area, the turbidity of the water increases due to the adhesion of microorganisms and bacteria, and There is a problem that suspended toxins such as odors and viruses are generated.

In addition, there is a problem in that concrete and structures are aged and corroded by rainwater introduced through cracks on the surface.

Registered Patent No. 10-1355034 (Registered on Jan. 13, 2014)

The present invention is a technology devised to solve the problems according to the above-described prior art, and satisfies the compressive strength of an aged concrete structure, strengthens adhesion by giving water resistance, and has a waterproof function, sulfuric acid, hydrochloric acid and chlorine An object of the present invention is to provide a composition for repairing and reinforcing concrete that can prevent corrosion or structural damage caused by the same, and a method for repairing and reinforcing concrete using the same.

The present invention provides 5 to 10 parts by weight of polyhydroxyaminoether, 1 to 20 parts by weight of a reactive diluent, 1 to 5 parts by weight of a filler, based on 100 parts by weight of a cycloaliphatic epoxy resin, It is characterized in that it comprises 10 to 100 parts by weight of the surface-modified nano-ceramic metal powder, 10 to 20 parts by weight of 4-hydroxyphenylamine, and 1 to 5 parts by weight of a diluent.

In the present invention, the cycloaliphatic epoxy resin is hexahydrophthalic acid diglycidyl ester, 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate, and 4-glycidyloxy-N,N - It is characterized in that it comprises any one or a plurality selected from diglycidyl amine.

In addition, the present invention is a surface treatment step of treating the surface of the concrete (S10); After the surface treatment step (S10), a first rust preventive application step (S20) of removing the rust of the reinforcing bar exposed to the outside of the concrete and applying a rust removing type rust preventive agent; After the first rust preventive application step (S20), a second rust preventive agent application step (S30) of mixing a coating-type rust preventive agent with cement powder to the reinforcing bar exposed to the outside of the concrete; After the second rust preventive application step (S30), an alkali rust prevention step (S40) of applying a penetrating rust preventive agent to the concrete surface to restore alkalinity; After the alkali rust prevention step (S40), an adhesive application step of applying an adhesive to the concrete surface (S50); After the adhesive application step (S50), a repair material application step (S60) of applying a repair material to the concrete surface; and a finishing step (S70) of applying a surface treatment agent to the concrete surface after the repair material application step (S60).

In the present invention, the adhesive used in the adhesive application step (S50) is 80 to 140 parts by weight of elvan stone, 2 to 10 parts by weight of silica fume, 2 to 10 parts by weight of an expanding agent, and 2 to 10 parts by weight of polymer powder based on 100 parts by weight of cement. A first adhesive mixed by weight; It is characterized in that it comprises a.

In addition, in the present invention, the adhesive used in the adhesive application step (S50) is 100 to 150 parts by weight of finely divided silica, 80 to 120 parts by weight of a color pigment, 20 to 90 parts by weight of an extender, and a light stabilizer based on 100 parts by weight of calcium carbonate. 2 to 10 parts by weight of a second adhesive in which 2 to 10 parts by weight of a polymerization accelerator, 2 to 10 parts by weight of an anti-settling agent, and 2 to 10 parts by weight of a dispersant are mixed; It is characterized in that it comprises a.

In addition, the present invention, the adhesive used in the adhesive application step (S50) is an additive comprising at least one of a defoaming agent, a flame retardant, a plasticizer and an antioxidant; It is characterized in that it comprises a.

The composition for concrete repair and reinforcement according to the present invention presented as described above and the concrete repair and reinforcement method using the same give water resistance to the surface of an aged concrete structure to strengthen adhesion, have waterproofing and anticorrosive functions, sulfuric acid, hydrochloric acid and chlorine There is an effect that can prevent corrosion or structural damage caused by the.

1 is a flow chart showing a concrete repair and reinforcement composition and a concrete repair and reinforcement method using the same according to a preferred embodiment of the present invention.

The present invention relates to a concrete repair and reinforcement composition and a concrete repair and reinforcement method using the same. After the surface treatment step (S10), a first rust preventive application step (S20) of removing the rust of the reinforcing bar exposed to the outside of the concrete and applying a rust removing type rust preventive agent; After the first rust preventive application step (S20), a second rust preventive agent application step (S30) of mixing a coating-type rust preventive agent with cement powder to the reinforcing bar exposed to the outside of the concrete; After the second rust preventive application step (S30), an alkali rust prevention step (S40) of applying a penetrating rust preventive agent to the concrete surface to restore alkalinity; After the alkali rust prevention step (S40), an adhesive application step of applying an adhesive to the concrete surface (S50); After the adhesive application step (S50), a repair material application step (S60) of applying a repair material to the concrete surface; and a finishing step (S70) of applying a surface treatment agent to the concrete surface after the repair material application step (S60); It is characterized in that it comprises a.

Hereinafter, a concrete repair and reinforcement composition and a concrete repair and reinforcement method using the same according to a preferred embodiment of the present invention will be described in detail as follows.

First, the surface treatment step (S10) of the present invention is

As a treatment for the surface of concrete, in order to solve problems such as cracks and damage occurring on the surface of the concrete structure (hereinafter referred to as the concrete surface), the surface of the concrete is cleaned during the repair and reinforcement method, and the rust preventive agent and repair reinforcement to be described below It is a step for easily attaching the composition to the concrete surface.

In addition, the surface treatment step (S10) includes the first surface treatment step (S11) of exposing the reinforcing bars using a hand tool or a power tool, and removing dirt and latitude, and the leaking part and rapid connection of the concrete surface. It can be configured to include a water-repellent material application step (S12) of applying from cement to harden the area to be water-watered, and a washing catcher step (S13) of washing and collecting high-pressure water using a high-pressure sprinkler on the concrete surface (S13). .

At this time, it is preferable to proceed after confirming the degree of neutralization using a phenolphthalene solution when treating the concrete surface.

In the first surface treatment step (S11), the concrete surface is chipped using a power tool or a hand tool such as a grinder, a breaker and a hammer.

At this time, it is preferable that the chipped part includes the part and the periphery where cracks, peeling or dropping of the concrete surface have occurred, and accordingly, it is possible to repair and reinforce even the weakened part of the concrete structure to ensure improved durability. do.

The water-repellent material application step (S12) is a step of, after the first surface treatment step (S11), when there is a water leakage site on the surface-treated concrete surface, applying or filling the water stop material to the water leakage area is performed.

In addition, the step of applying the water repellent material (S12) refers to a step of applying or filling the leaking area with from cement using a plastering tool (eg, a trowel).

The from cement has the characteristics of super-velocity, initial high strength, non-shrinkage, fine particles, seawater silver and chemical resistance, and is a natural cement with excellent watertightness with high fineness. It is suitable for corrosive environments such as sewage and wastewater treatment plants, livestock houses, dairy factories, and sewage tunnels.

The washing catcher step (S13) is to clean the concrete surface and catch the washing wastewater, and if there is a leaking part, after the water stop material application step (S12) is performed, from the water stop material application step (S12) applied or filled After the curing of the cement is completed, the work may proceed, and if there is no leaking part on the concrete surface in the first surface treatment step (S11), the washing catcher step (S13) may be performed immediately.

In addition, the washing catcher step (S13) is a step of washing foreign substances on the concrete surface by spraying water at high pressure using a high-pressure water sprayer.

After that, the steps to be described below are preferably performed after the washed concrete surface is dry.

The first rust inhibitor application step (S20) of the present invention is

After the surface treatment step (S10), it is a step of removing the rust of the reinforcing bar exposed to the outside of the concrete and applying a rust-removing type rust preventive agent.

The rust-removing-type rust preventive agent is mainly composed of phosphoric acid, a specific gravity of 1.18 to 1.28, a dryness of 1 to 2 hours (15 to 30 ℃) of the rust-removing type rust preventive agent having the physical properties of the may be used, the reinforcing bar exposed outside the concrete It can neutralize the corroded part to remove rust and prevent corrosion of rebar due to acid resistance.

In addition, after the surface treatment step (S10) is completed, since oily foreign substances may remain on the reinforcing bars, in the first rust prevention treatment step (S20), the oily foreign substances are wiped off using a cloth and a rust removal type You can do the work of applying a rust inhibitor.

The second rust inhibitor application step (S30) of the present invention is

After the first rust preventive application step (S20), a coating-type rust preventive agent is mixed with cement powder and applied to the reinforcing bar exposed to the outside of the concrete.

The coating-type rust preventive agent, whose main component is an antioxidant and has a specific gravity of 0.08 to 1.08, can be used, and with an excellent rust prevention function, a film is formed on the surface of the reinforcing bar to prevent oxidation of the reinforcing bar, so the surface of the reinforcing bar rusts again can be prevented from doing

In addition, as the coating-type rust preventive agent is mixed with cement powder and used, the viscosity may be improved to strengthen the adhesion.

The alkali rust prevention step (S40) of the present invention is

After the second rust preventive application step (S30), it is a step of applying a penetrating rust preventive agent to the concrete surface so that the alkali recovery treatment is made.

The penetration-type rust preventive agent is an inorganic ionic material (lithium nitrite, silane compound system) as a main component, and may be used with a pH of 12.5 to 13.5 and a specific gravity of 1 to 1.1. It is possible to regenerate aged concrete by reducing it to alkali, thereby securing chemical resistance, thereby preventing corrosion of rebar and improving weather resistance.

The adhesive application step (S50) of the present invention is

After the alkali rust prevention step (S40), it is a step of applying an adhesive to the concrete surface.

In addition, the adhesive application step (S50) is to adhere well to the concrete to be constructed by applying the adhesive to the concrete surface and the repair material used in the subsequent repair material application step (S60).

In addition, the adhesive used in the adhesive application step (S50) is a mixture of 80 to 140 parts by weight of elvan stone, 2 to 10 parts by weight of silica fume, 2 to 10 parts by weight of an expanding agent, and 2 to 10 parts by weight of polymer powder based on 100 parts by weight of cement. It may be configured to include a first adhesive.

The cement may include one or two or more selected from from cement, portlant cement, white portlant cement, alumina cement, crude Portlant cement, and super-strength cement. and in terms of initial high strength.

The elvan is a representative ceramic material that emits far-infrared rays, and is a semicentric rock belonging to quartz porphyry and feldspar porphyry. The appearance is characterized by densely embedded white spots, and contains a small amount of ferric oxide in addition to silicic anhydride and aluminum oxide.

Elvan stone contains 30,000 to 150,000 pores per 1 cm 2 , so it has strong adsorption and contains about 25,000 kinds of inorganic salts. More specifically, silicon oxide (SiO ₂ ) and aluminum oxide (Al ₂ O ₃ ) have a three-dimensionally connected structure by oxygen atoms located at the four vertices of the tetrahedron, and are diffused into the pores of the cavities and particles in the crystal lattice. The material and the pore wall surface are exchanged with metal ions capable of ion exchange and are also adsorbed.

In addition, it is preferable to use the elvan by pulverizing it, and it is preferable to use a mixture of elvan stone having an average particle diameter of 2.5 to 5 mm and elvan stone having an average particle diameter of 1 to 2 mm to achieve uniform mixing and increase the specific surface area of elvan stone It is preferable in terms of increasing the bonding strength between and cement.

At this time, the elvan stone is preferably added in an amount of 80 to 140 parts by weight based on 100 parts by weight of cement. In the case of adding it, it is preferable to add it within the above range because the compressive strength and thermal conductivity of the composition may be deteriorated.

The silica fume is used to enhance the strength and durability of concrete, and is an amorphous, ultra-fine powder that can be obtained from a silicon-ferrosilicon alloy product. Silica fume, generated as an industrial by-product, reacts with calcium hydroxide and changes to hydrous calcium silicate at room temperature, resulting in pozzolanic properties.

In addition, the silica fume improves the dispersibility and water-reducing effect due to the ball bearing effect of the spherical particles, improves the watertightness and strength through the filling effect of silica fume between the cement particles, and suppresses the alkali silica reaction by improving the adhesion of the mortar and chemical It has the effect of improving resistance.

At this time, the silica fume is preferably added in an amount of 2 to 10 parts by weight based on 100 parts by weight of cement. When less than 2 parts by weight is added, it is difficult to improve the strength and durability of concrete, and when added in excess of 10 parts by weight, It is preferable to add within the above range because the dispersibility with other compositions may be lowered and mechanical properties may be deteriorated.

When the expanding agent is mixed with water and hydrated, expansion compensating for the shrinkage of concrete occurs to prevent cracking of concrete and to make the structure dense, and if it is a conventional expanding agent in the art for this purpose, it is not particularly limited.

At this time, it is preferable to add 2 to 10 parts by weight of the expanding agent based on 100 parts by weight of cement. When less than 2 parts by weight is added, it is difficult to prevent cracking of concrete, and when added in excess of 10 parts by weight, excessive expansion occurs. Due to the relaxation of the concrete structure, there may be a problem that the strength is lowered, so it is preferable to add it within the above range.

The polymer powder is to increase the strength and miscibility of cement, and as the polymer powder is dissolved at the same time as the cement is hydrated, the material separation resistance is increased so that the cement, elvan, etc. do not bleed, and finally, the cement hydrate and complex It forms a matrix and increases tensile strength, flexural strength, and adhesion strength.

In addition, the type of the polymer powder is not limited as long as it is commonly used in the art. For example, any one or two selected from polyacrylic ester, polyvinyl acetate, polysaccharide, polyvinyl propionate, ethylene vinyl acetate, polypropylene, methylcellulose, polyvinyl alcohol, polyacrylate, and vinyl acetate/vinylbasatate There is an abnormality, and among them, it is preferable to use a water-swellable polysaccharide-based polymer powder.

At this time, the polymer powder is preferably added in an amount of 2 to 10 parts by weight based on 100 parts by weight of cement. When less than 2 parts by weight is added, the compatibility of the composition is reduced, and when added in excess of 10 parts by weight, the viscosity is excessively high. It is preferable to add within the above range because the increase may cause a problem that workability is lowered.

In addition, the adhesive used in the adhesive application step (S50) is 100 to 150 parts by weight of finely divided silica, 80 to 120 parts by weight of a color pigment, 20 to 90 parts by weight of an extender pigment, 2 to 10 parts by weight of a light stabilizer based on 100 parts by weight of calcium carbonate. Parts by weight, 2 to 10 parts by weight of the polymerization accelerator, 2 to 10 parts by weight of the anti-settling agent, and 2 to 10 parts by weight of the dispersant may be configured to further include a mixed second adhesive.

The calcium carbonate may improve the flowability of the adhesive composition and improve whiteness.

The finely divided silica may improve durability and increase strength of the adhesive composition.

In this case, the finely divided silica is preferably added in an amount of 100 to 150 parts by weight based on 100 parts by weight of calcium carbonate. When less than 100 parts by weight is added, the strength decreases, and when added in excess of 150 parts by weight, durability is improved and strength is increased. Since there is a problem that the effect of the insufficient appears, it is preferable to add it in parts by weight within the above range.

The colored pigment is used to give the color of the composition, and it prevents the aesthetic effect from being inhibited by blocking the heterogeneous color expression of the base concrete and the parts to be repaired and reinforced by maintaining the same color as the surface of the concrete. can be prevented

At this time, the coloring pigment is preferably added in an amount of 80 to 120 parts by weight based on 100 parts by weight of calcium carbonate. When less than 80 parts by weight is added, the desired color may not appear properly, and when added in excess of 120 parts by weight, It is preferable to add within the above range because a problem of excessive color may occur.

The extender pigment is a pigment that looks white like a white pigment on the outside, but becomes almost transparent when mixed with oil or resin and does not show color, and supplements the physical properties of the composition to improve strength, adhesion, moisture resistance, water resistance, etc. It works.

At this time, the extender pigment is preferably added in an amount of 20 to 90 parts by weight based on 100 parts by weight of calcium carbonate, but when less than 20 parts by weight is added, there is a problem in that the viscosity is low and adhesion to the surface to be constructed is lowered, and 90 parts by weight When it is added in excess of parts, it is preferable to add in parts by weight within the above range because a problem may occur in that the luster is darkly produced and the aesthetic effect is impaired.

The light stabilizer is used for the purpose of improving weather resistance by suppressing a change in physical properties (eg, decomposition) of a concrete structure according to a photochemical reaction or absorption of ultraviolet rays, and may be a hindered amine type. As an example, EVERSORB-90 (Everlight Chemical), Eversorb-95 (Everlight Chemical), etc. may be used, but is not limited thereto.

In this case, the light stabilizer is preferably added in an amount of 2 to 10 parts by weight based on 100 parts by weight of calcium carbonate. It is preferable to add within the above range because a problem of initial discoloration may occur due to the input.

The polymerization accelerator is used to promote mixing of the composition, and may include iron salts mixed with N, N-dimethylaniline, tetrahydroquinoline, triethylamine and benzoin, preferably N, N-dimethyl It may consist of aniline.

At this time, the polymerization accelerator is preferably added in an amount of 2 to 10 parts by weight based on 100 parts by weight of calcium carbonate. It is preferable to add within the above range because there is a problem that yellowing of the occurs.

The anti-settling agent is for increasing the viscosity and imparting thixotropic properties, and various anti-settling agents may be used, but selected from the group consisting of ethyl hydroxyethyl cellulose, hydroxymethyl cellulose, carboxymethyl cellulose, organic bentonite and silica compounds. It is preferable to use any one or a mixture of two or more thereof.

At this time, the anti-settling agent is preferably added in an amount of 2 to 10 parts by weight based on 100 parts by weight of calcium carbonate. In this case, it is preferable to add within the above range because the viscosity may be excessively increased and workability may be deteriorated.

The dispersant includes silicone emulsion type, self-emulsifying type, oil type, oil compound type, solution type, powder type, solid type, etc., but the most suitable one is appropriately selected in combination with the oil-based solvent to be used. In particular, it is preferable to use, for example, a hydrophilic or water-soluble silicone-based defoaming agent, in order to make it exist at the interface between the oil-based solvent and air rather than the interface between the oil-based solvent and the polytetrafluoroethylene micropowder, but without being limited thereto, it will be available

At this time, the dispersant is preferably used in an amount of 2 to 10 parts by weight based on 100 parts by weight of calcium carbonate. In this case, it is preferable to add parts by weight within the above range because it is uneconomical because there is no effect change due to excessive input.

In addition, the adhesive used in the adhesive application step (S50) may further include an additive comprising any one or a plurality selected from an antifoaming agent, a flame retardant, a plasticizer and an antioxidant.

The antifoaming agent is used for the purpose of suppressing the occurrence of bubbles, and at least one selected from modified silicones, higher alcohols, minerals, higher fatty acid glycerite, dimethyl polysiloxane, polypropylene glycol, hydrophobic silica, and perfluoroalkyl antifoaming agents It may be composed of

Modified silicones are materials made by attaching silicone components to a reactor of polyurethane, and refer to silicones that have both physical and chemical advantages of urethane and silicone. That is, paintability, non-shrinkability, non-staining properties, weather and temperature change are small, and UV resistance is good.

Higher alcohols refer to substances with 6 or more carbon atoms and hydroxyl groups in the molecule. When the number of carbon atoms is 6 to 10, it exists in a liquid state at room temperature and can be used for increasing the viscosity and stability of the formulation.

Higher fatty acid glycerite refers to an ester-bonded compound of fatty acid and glycerol, and has a structure bonded to a hydroxyl functional group. It has the property of absorbing moisture in the air, and can be used as an emulsifier and an antifoaming agent.

Dimethyl polysiloxane is a silicone-based organic polymer that has strong viscosity, chemical resistance, stability against humidity and temperature changes, inertness, non-toxicity, and non-flammability.

Polypropylene glycol is a polymer of propylene glycol, which is a colorless, transparent liquid with a slight odor. It is not volatile, stable to heat and sunlight, but has flammability (flash point 104 degrees). It can be used as a solvent for dissolving pigments, essential oils, and resins and mixing them with water again. It can be used as an emulsification limiting agent, preservative, air sterilization, etc.

Hydrophobic silica is a hydrophobic wet-method synthetic silica whose surface is hydrophobized with silicone oil, and is used as an antifoaming agent, a matting agent for paints, and an antiblocking agent for films. When used for paint, water repellency can be improved, and antifouling, alkali resistance, chemical resistance, and scratch resistance can be improved.

The perfluoroalkyl group antifoaming agent is one in which all or most of the hydrogen atoms in the alkyl group are substituted with fluorine atoms, and the efficiency of the surface properties of the polymer is good, and the water repellency and oil repellency can be improved.

In addition, the flame retardant may be a mixture containing aluminum hydroxide and antimony trioxide, and acts to prevent oxidation and corrosion by acting on the part where the reinforcing bar exposed on the surface of the concrete and the adhesive composition come into contact, and heat resistance can improve the flame retardant effect by increasing

The plasticizer is for improving the rheological properties, and has excellent compatibility with the polymer among the adhesion promoters included in the adhesive composition, so that the adhesion promotion can be more effectively provided. At this time, if the amount of the plasticizer used increases, the mechanical strength of the adhesive composition may be weakened, and if a small amount is included, the viscosity is high, and there is a problem in that smoothness is reduced during operation.

The antioxidant prevents oxidation by oxygen to prevent deterioration of adhesive quality, and amine-based, bisphenol-based, monophenol-based and sulfur-based antioxidants may be used.

The repair re-applying step (S60) of the present invention is

After the adhesive application step (S50), it is a step of applying a repair material to the concrete surface, and is a step of preventing deformation due to external impact as it is applied to a part requiring concrete repair and dried.

In addition, the repair material may include 5 to 10 parts by weight of polyhydroxyaminoether, 1 to 20 parts by weight of a reactive diluent, 1 to 5 parts by weight of a filler, and a surface-modified nano-ceramic based on 100 parts by weight of the cycloaliphatic epoxy resin. A mixture of 10 to 100 parts by weight of metal powder, 10 to 20 parts by weight of 4-hydroxyphenylamine, and 1 to 5 parts by weight of a diluent may be used.

The cycloaliphatic epoxy resin is obtained by reacting a compound having a double bond with a peroxide in a cycloaliphatic structure, and has excellent heat resistance, mechanical properties, and adhesion.

Representative examples of the cycloaliphatic epoxy resin include 3,4-epoxycyclohexylmethyl-3,4 epoxy-cyclohexanecarboxylate, diglycidyl ester hexahydrophthalic acid, poly[(2-oxiranyl)-1 ,2-cyclohexanediol] 2-ethyl-2 (hydromethyl) -1,3-propanediol ether, hexahydrophthalic acid diglycidyl ester, 3,4-epoxycyclohexylmethyl 3,4-epoxycyclo hexane carboxylate, 4-glycidyloxy-N,N-diglycidyl amine, and the like, and these may be used alone or in combination of two or more.

The polyhydroxyaminoether (PHAE) is a resin produced from an epoxy compound and an amino compound, and has excellent adhesion because the hydroxyl group descending from the molecular central chain has a polar action between the layers with other parts in the molecular center.

The filler may include any one or a plurality of fillers selected from mica, talc, calcium carbonate, and wood powder, and may increase mechanical properties such as scratch resistance, tensile strength, and breaking strength of the repair material.

At this time, the filler is preferably added in an amount of 1 to 5 parts by weight based on 100 parts by weight of the cycloaliphatic epoxy resin. When added, the fluidity of the composition may decrease and the filler may act as a crack, thereby lowering mechanical properties.

The reactive diluent is added to dilute the high-viscosity epoxy to increase flexibility and improve workability. An ether series such as (Butyl Glycidyl Ether) can be used.

The reactive diluent is preferably added in an amount of 1 to 20 parts by weight based on 100 parts by weight of the cycloaliphatic epoxy resin. When added in excess of parts, the peel strength after coating of the composition may decrease.

The surface-modified nano-ceramic metal powder can be used to improve the chemical resistance and abrasion resistance of the composition, and when mixed with an adhesive aid to be described later, it can significantly increase the chemical resistance and flame resistance of the adhesive aid.

The surface-modified nano-ceramic metal powder may be prepared by coating one or a plurality of sol-gel resins on the surface of metal particles, and more specifically, it may be prepared including metal particles, sol-gel resin and a solvent.

The metal particles are a material for imparting a waterproof function of the composition, and although a general particle shape is good, it is preferable to have a small sheet shape such as a metal piece for improving the waterproof function.

More preferably, the length of the long axis of the metal particles is 5 to 10 μm. This is because if the length of the long axis is less than 5 μm, oxidation is easy, and if the length of the long axis is greater than 10 μm, there is a problem in that acid resistance is lowered.

In this case, the long axis of the metal piece refers to the longest line segment among the line segments crossing the surface of the metal piece. In addition, although there is a slight difference in the size of each metal piece, the length of the longest major axis or the average of the lengths of the major axes is taken as the length of the major axis.

The metal particles are not limited in material. For example, the metal particles may include any one selected from aluminum, magnesium, zinc, etc. or an alloy thereof.

The sol-gel resin (organic-inorganic hybrid resin) has excellent bonding to metal pieces and has a dense structure, so that corrosion resistance, acid resistance, heat resistance and scratch resistance can be imparted to the composition.

The organic-inorganic hybrid resin is not limited to a type as long as it is a gel resin obtained by sol-gel reaction, and examples thereof include zirconium butoxide, isopropyl titanate, γ-methacryloxypropyl trimethoxysilane and It may be any one or a plurality selected from n-phenyl-γ-aminopropyltrimethoxysilane and the like.

The organic-inorganic hybrid resin preferably contains 1 to 100 parts by weight based on 100 parts by weight of the metal particles. When the content of the organic-inorganic hybrid resin is added to less than 1 part by weight, the above-described scratch resistance, corrosion resistance, and acid resistance may decrease, and when added in excess of 100 parts by weight, the storage stability of the nano-ceramic metal powder decreases. there is

In the present invention, the type and amount of the solvent is not limited, but water, acetone, dipropylene glycol, butyldiglycol, isopropyl alcohol, etc. may be included, and these may be used alone or in combination of two or more. It is preferable to freely add the addition amount in an amount of about 300 parts by weight based on 100 parts by weight of the metal particles.

In addition, a polyurethane prepolymer may be further added to the surface-modified nano-ceramic metal powder if necessary. The polyurethane prepolymer is for further strengthening the corrosion resistance and impact resistance of the organic-inorganic hybrid resin described above, and may include a polyurethane prepolymer having an isocyanate content of 2 to 5 parts by weight and a weight average molecular weight of 10,000 to 100,000.

The polyurethane prepolymer is a self-emulsifying type and is prepared by polymerizing isocyanates and polyols. As isocyanates, isophorone diisocyanate, hexamethylene diisocyanate, cyclohexane diisocyanate, etc. can be used, and as polyols, polycarbonate polyol, polyether polyol, polyester polyol, etc. can be used.

The polyurethane prepolymer preferably contains 1 to 20 parts by weight based on 100 parts by weight of the metal particles. When the addition amount is less than 1 part by weight, the corrosion resistance and chemical resistance of the ceramic metal powder may decrease, and when it is added in excess of 20 parts by weight, the coating layer may not be properly formed due to increased reactivity of the composition to be coated.

The surface-modified nano-ceramic metal powder is not limited to a manufacturing method. For example, the surface-modified nano-ceramic metal powder may be prepared by first heating a solvent, a metal piece and a sol-gel resin at a temperature of 20 to 30° C., and then adding a polyurethane prepolymer thereto as necessary. At this time, since the viscosity may increase rapidly after mixing the polyurethane prepolymer, it is preferable to prepare it by maintaining it for 10 to 120 minutes at a stirring speed of 100 to 2,000 rpm.

The surface-modified nano-ceramic metal powder preferably contains 10 to 100 parts by weight based on 100 parts by weight of the cycloaliphatic epoxy resin. When less than 10 parts by weight is added, effects such as corrosion resistance and chemical resistance enhancement are insignificant, and when added in excess of 100 parts by weight, the ceramic metal powder acts as a crack, which may cause a problem in that mechanical properties are rather deteriorated. It is preferable to add within the above range.

The 4-hydroxyphenylamine is added to cure the above-mentioned epoxy resin. In the present invention, only 4-hydroxyphenylamine is limited, but in addition, various aromatic amine curing agents capable of curing the epoxy resin are further included. is also free

Such aromatic amine curing agents include, for example, metaphenylenediamine, paraphenylenediamine, 4,4-methylenediamine, ethyltoluenediamine, diaminodiphenylsulfone, a eutectic mixture of metaphenylenediamine and paraphenylenediamine, metaphenyl There are rendiamine and 4,4-methylenediamine, and these may be used alone or in combination of two or more.

The 4-hydroxyphenylamine is preferably included in an amount of 10 to 20 parts by weight based on 100 parts by weight of the cycloaliphatic epoxy resin. This may fall, and when added in excess of 20 parts by weight, the curing of the composition proceeds rapidly, and workability and brittleness may be deteriorated, so it is preferable to add within the above range.

In addition, the repair material may be configured to further include an adhesive aid.

The adhesive aid is to increase the adhesion of the above-mentioned epoxy resin and inhibit the penetration of acid or chlorine to prevent corrosion or weakening of strength of concrete, and benzyl alcohol may be mainly used.

In addition, more preferably, benzyl alcohol represented by the following Chemical Formulas 1 and 2 may be included as the adhesion aid.

[Formula 1]

[Formula 2]

(In Formulas 1 and 2, X ₁ and X ₂ are hydrogen or C1-C6 alkyl,

R is C1-C20 saturated or unsaturated alkyl.)

In addition, in Formula 1 or 2, R may have the following structure.

[Formula 3]

The above-mentioned benzyl alcohols are natural substances extracted from the fruits or seeds of trees. They have oily properties because they have a long alkyl group, and as they come into contact with oxygen in the air, bonds between the benzyl alcohols occur to form a three-dimensional membrane. Because it is formed, it can block penetration without reacting with corrosive components such as chlorine, and can completely block contact of corrosive components with concrete or other structures.

More preferably, the composition of Formula 1 and the composition of Formula 2 may be mixed and used as the adhesion aid. At this time, although the mixing ratio of the composition is not limited, the composition of Formula 1 : The composition of Formula 2 is preferably mixed in a weight ratio of 1:0.2 to 0.5, respectively. When the composition ratio of the composition is out of the above range, mechanical properties of the coating film may be deteriorated when exposed to salt water due to deterioration of adhesive properties and flame resistance.

The adhesion aid is preferably added in an amount of 1 to 20 parts by weight based on 100 parts by weight of the cycloaliphatic epoxy resin. When less than 1 part by weight of the adhesive aid is added, the synergistic effect of the above-described mechanical properties and flame resistance of the coating film is insignificant. The workability of the coating film is deteriorated, and an orange peel or crack may occur, and consequently, the mechanical properties of the coating film may decrease.

In addition, the repair re-applying step (S60) of the present invention is 160 to 190 parts by weight of silica sol, 80 to 95 parts by weight of zeolite, 65 to 100 parts by weight of water, 1 to 1.5 parts by weight of zinc oxide based on 100 parts by weight of triethoxysilane. A first repair material application step (S61) of applying a first repair material comprising parts and 45 to 60 parts by weight of sodium hydroxide; and 50 to 80 parts by weight of silicon dioxide, 0.2 to 0.4 parts by weight of a dispersant, based on 100 parts by weight of the binder; 2 to 4 parts by weight of a polymer resin, 5 to 8 parts by weight of silica fume, 20 to 30 parts by weight of potassium hydroxide, 0.4 to 14 parts by weight of an antifoaming agent, and 0.4 to 14 parts by weight of a fiber reinforcing agent. It may be configured to further include a; repair re-applying step (S62).

The first repair re-applying step (S61) is based on 100 parts by weight of triethoxysilane, 160 to 190 parts by weight of silica sol, 80 to 95 parts by weight of zeolite, 65 to 100 parts by weight of water, 1 to 1.5 parts by weight of zinc oxide and A first repair material comprising 45 to 60 parts by weight of sodium hydroxide may be applied.

In addition, in the first repair re-applying step (S61), 5 to 10 parts by weight of polyhydroxyaminoether, 1 to 20 parts by weight of a reactive diluent, 1 to 5 parts by weight of a filler based on 100 parts by weight of the cycloaliphatic epoxy resin After applying a water repair material in which 10 to 100 parts by weight of the surface-modified nano-ceramic metal powder, 10 to 20 parts by weight of 4-hydroxyphenylamine, and 1 to 5 parts by weight of a diluent are mixed, the repair material is dried and then applied on the top is a step

The triethoxysilane is used to improve adhesion and water resistance and durability of the coating film, and when mixed with the following silica sol, flexibility, drying speed, and storage of the silica sol can be improved.

The silica sol reacts with water and a basic compound contained in the composition to form Si-OH groups on the surface of the metal oxide particles and is dispersed in nano-sized particles, and exists between the metal oxide particles to increase the bonding force between the particles. .

At this time, the silica sol is preferably added in an amount of 160 to 190 parts by weight based on 100 parts by weight of triethoxysilane. When less than 160 parts by weight is added, corrosion by a strong acid (eg sulfuric acid) cannot be prevented, 190 When added in excess of parts by weight, there is a problem in that cracks occur, so it is preferable to add within the above range.

The zeolite is a natural ceramic charcoal stone that is naturally calcined by high heat of 1600°C during a volcanic eruption millions of years ago to tens of millions of years ago. , bacterial growth inhibition, heavy metal adsorption, toxic removal, air purification, negative ions and far-infrared radiation have good effects.

At this time, the Songi zeolite is preferably added in 80 to 95 parts by weight based on 100 parts by weight of triethoxysilane. , When added in excess of 95 parts by weight, it is preferable to add within the above range because the effect is not improved depending on the excessively added amount, so it is uneconomical.

The water is added so that the second repair material composition is mixed well, and it is preferable to use ion-exchanged water rather than general water to prevent chemical and physical reactions.

At this time, the water is preferably added in an amount of 65 to 100 parts by weight based on 100 parts by weight of triethoxysilane. When less than 65 parts by weight is added, precipitation of the second repair material composition may occur, and it is added in excess of 100 parts by weight. If it is, layer separation of the second repair material composition may occur, so it is preferable to add it within the above range.

The zinc oxide is a material added to strengthen the surface strength, and it is possible to obtain enhanced surface strength by including zinc ions, which are metals, in the strength of silaca sol.

In this case, the zinc oxide is preferably added in an amount of 1 to 1.5 parts by weight based on 100 parts by weight of triethoxysilane. When less than 1 part by weight is added, the surface strength cannot be strengthened, and when added in excess of 1.5 parts by weight, It is preferable to add in parts by weight within the above range because a problem of deterioration of storage may occur.

The sodium hydroxide is a material for forming a stable coating film by reacting with the silica sol, which cannot form a coating film by itself, and is preferably added in an amount of 45 to 60 parts by weight based on 100 parts by weight of triethoxysilane, less than 45 parts by weight. When added, cracks may occur during curing, and when added in excess of 60 parts by weight, water resistance may not be secured, so it is preferable to add in parts by weight within the above range.

In addition, in the second repair material application step (S62), 50 to 80 parts by weight of silicon dioxide, 0.2 to 0.4 parts by weight of a dispersant, 2 to 4 parts by weight of a polymer resin, 5 to 8 parts by weight of silica fume, hydroxide based on 100 parts by weight of the binder. This is a step of applying a second repair material comprising 20 to 30 parts by weight of potassium, 0.4 to 14 parts by weight of an antifoaming agent, and 0.4 to 14 parts by weight of a fiber reinforcing agent.

The binder is a mixture of Portland cement, alumina cement and blast furnace slag cement, and may be used to increase bonding strength to concrete.

The Portland cement is a typical hydraulic cement, and raw materials containing silica, alumina, iron oxide and lime as main components (usually limestone, clay or soft silica, or pyrite sinter) are sufficiently mixed in an appropriate ratio and calcined until a part is melted. An appropriate amount of gypsum is added to one clinker and pulverized into powder.

The alumina cement is a cement with an alumina (Al ₂ O ₃ ) content of 30 to 40%, has a fast hardening and high resistance to seawater and chemicals, and prevents cracking of concrete by making the structure dense and prevents shrinkage of concrete can do.

The blast-furnace slag cement is a by-product obtained when manufacturing iron wash, and has a tendency to hydrate and harden, so it is used as a main material for cement as well as prevents a heat island phenomenon, has excellent thermal effect, good stability, and can improve strength.

At this time, the Portland cement, alumina cement and blast furnace slag cement are preferably mixed in a weight ratio of 4 : 1 : 1, but when mixed less than or exceeding the weight ratio, the bonding strength between the compositions and the bonding strength to concrete are reduced. This may occur, so it is preferable to mix within the above range.

The silicon dioxide (SiO ₂ ) may have a particle size of No. 4 to No. 6 yarn, and preferably No. 5 yarn may be used. If the particle size is less than No. 4, there is a risk of lowering the fluidity, and if the particle size exceeds No. 6 yarn, workability may be reduced. Such silicon oxide is mainly found in sand or quartz, and is used as a main component of concrete structures.

At this time, the silicon dioxide is preferably added in an amount of 50 to 80 parts by weight based on 100 parts by weight of the binder. This lowering problem may occur, so it is preferable to add it within the above range.

The dispersant is used to increase fluidity for improving workability by preventing material separation, for example, an unsaturated polycarboxylic acid-based dispersant may be used.

At this time, the dispersant is preferably added in an amount of 0.2 to 0.4 parts by weight based on 100 parts by weight of the binder. When less than 0.2 parts by weight is added, material separation is easy to occur, and when added in excess of 0.4 parts by weight, strength and It is preferable to add within the above range because a problem of reduced durability may occur.

The polymer resin may improve elasticity, adhesion strength, flexural strength, tensile strength and durability, flexural toughness, waterproofing and surface hardness.

At this time, the polymer resin is preferably added in 2 to 4 parts by weight based on 100 parts by weight of the binder. When less than 2 parts by weight is added, elasticity, adhesion strength, bending sensation, tensile strength and durability cannot be improved, and 4 When added in excess of parts by weight, it is preferable to add within the above range because the effect is not improved depending on the excessively added amount, which is uneconomical.

The silica fume is used to enhance the strength and durability of concrete, and is an amorphous, ultra-fine powder that can be obtained from a silicon-ferrosilicon alloy product. Silica fume, which is generated as an industrial by-product, reacts with calcium hydroxide and changes to hydrous calcium silicate at room temperature, thereby exhibiting pozzolanic properties.

In addition, the silica fume improves the dispersibility and water-reducing effect due to the ball bearing effect of the spherical particles, improves the watertightness and strength through the filling effect of silica fume between the cement particles, and suppresses the alkali silica reaction by improving the adhesion of the mortar and chemical resistance can be improved.

At this time, the silica fume is preferably added in an amount of 5 to 8 parts by weight based on 100 parts by weight of the binder. It is preferable to add within the above range because the dispersibility with other compositions may be lowered and mechanical properties may be deteriorated.

The potassium hydroxide is called caustic potassium, and is produced by using a caustic method of reacting potassium carbonate with lime milk or by electrolyzing an aqueous potassium chloride solution, and can improve strength and corrosion resistance.

At this time, the potassium hydroxide is preferably added in an amount of 20 to 30 parts by weight based on 100 parts by weight of the binder. When less than 20 parts by weight is added, the strength and corrosion resistance cannot be improved, and when added in excess of 30 parts by weight, It is preferable to add within the above range because the workability may be reduced and the manufacturing cost may be increased.

The anti-foaming agent, for example, a silicone-based anti-foaming agent may be used, performing a function of increasing strength and durability by removing pores of the composition, and improving workability and pot life.

At this time, it is preferable to add 0.4 to 14 parts by weight of the antifoaming agent based on 100 parts by weight of the binder. When less than 0.4 parts by weight is added, it is difficult to increase strength and durability, and when added in excess of 14 parts by weight, air entrainment is It is preferable to add within the above range because it may cause a problem that the workability is lowered due to the increase.

The fiber reinforcing agent is used to increase flexural strength and reduce dry cracks, and any one selected from coconut fiber, nylon fiber (Nalon), glass fiber, sisal fiber, PVA fiber (Polyvinyl alcohol) and polypropylene fiber or A plurality may be used.

At this time, the fiber reinforcing agent is preferably added in an amount of 0.4 to 14 parts by weight based on 100 parts by weight of the binder. In this case, it is preferable to add within the above range because it is uneconomical because there is no change in the effect depending on the amount added in excess.

The closing step (S70) of the present invention is

After the waterproof coating step (S60), it is a step of applying a surface treatment agent to the concrete surface so that the surface insulation treatment can be performed.

In addition, the surface treatment agent used in the finishing step (S70) may be made by mixing 20 wt% to 40 wt% of ceramic, 40 wt% to 60 wt% of acrylic emulsion, and 15 wt% to 25 wt% of silica airgel In this case, the resin-based emulsion may be composed of an acrylic emulsion.

The ceramic has excellent thermal insulation properties, and is used to increase the thermal insulation effect of a concrete structure through a coating layer by a surface treatment material. There is a problem in that the amount of the adhesive decreases as the adhesive strength decreases.

It is preferable to use a powder for this ceramic, and a particle size of 50 to 300 mesh may be used in consideration of mixing ratio and workability with other materials.

The acrylic emulsion is used to improve various physical properties such as compressive strength, adhesion strength, water resistance, alkali resistance, etc. When less than 40% by weight is mixed, the compressive strength of the coating layer is weak, and when it is mixed in excess of 60% by weight, the physical properties are large There is no change, but there is a problem in that the insulation effect is lowered due to the reduction of other materials.

The silica airgel has been specifically described in the inorganic polymer mortar composition described above, and when it is mixed in less than 15% by weight, effects such as heat insulation, crack prevention, shrinkage and expansion prevention, anti-condensation cannot be obtained, and when it is mixed in more than 25% by weight, Although the effect such as thermal insulation is improved, the adhesion and durability are lowered due to the imbalance between the materials, so that peeling may occur.

The above has been described with reference to a preferred embodiment of the present invention, and is not limited to the above embodiment, and a person of ordinary skill in the art through the above embodiment does not deviate from the gist of the present invention It can be implemented with various changes in

S10: surface treatment step S20: first rust preventive agent application step
S30: second rust preventive application step S40: alkali rust preventive stage
S50: Adhesive application step S60: Repair material application step
S70 : Closing stage

Claims (6)

5 to 10 parts by weight of polyhydroxyaminoether, 1 to 20 parts by weight of a reactive diluent, 1 to 5 parts by weight of a filler, 10 to 100 parts by weight of a surface-modified nano-ceramic metal powder, based on 100 parts by weight of the cycloaliphatic epoxy resin; Concrete repair and reinforcement composition comprising 10 to 20 parts by weight of 4-hydroxyphenylamine and 1 to 5 parts by weight of a diluent.
The method of claim 1,
The cycloaliphatic epoxy resin is
Any one selected from hexahydrophthalic acid diglycidyl ester, 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate, and 4-glycidyloxy-N,N-diglycidyl amine Or a composition for reinforcing concrete, characterized in that it comprises a plurality.
A surface treatment step of treating the surface of the concrete (S10);
After the surface treatment step (S10), a first rust preventive application step (S20) of removing the rust of the reinforcing bar exposed to the outside of the concrete and applying a rust removing type rust preventive agent;
After the first rust preventive application step (S20), a second rust preventive application step (S30) of mixing and applying a coating-type rust preventive agent with cement powder to the reinforcing bars exposed to the outside of the concrete;
After the second rust preventive application step (S30), an alkali rust prevention step (S40) of applying a penetration-type rust preventive agent to the concrete surface to restore alkalinity;
After the alkali rust prevention step (S40), an adhesive application step of applying an adhesive to the concrete surface (S50);
After the adhesive application step (S50), a repair material application step (S60) of applying a repair material to the concrete surface; and
After the repair material application step (S60), the finishing step of applying a surface treatment agent to the concrete surface (S70);
Concrete repair and reinforcement construction method using a composition for concrete repair and reinforcement, characterized in that it comprises a.
4. The method of claim 3,
The adhesive used in the adhesive application step (S50) is,
A first adhesive in which 80 to 140 parts by weight of elvan stone, 2 to 10 parts by weight of silica fume, 2 to 10 parts by weight of an expanding agent, and 2 to 10 parts by weight of polymer powder are mixed with respect to 100 parts by weight of cement;
Concrete repair and reinforcement construction method using a composition for concrete repair and reinforcement, characterized in that it comprises a.
4. The method of claim 3,
The adhesive used in the adhesive application step (S50) is,
100 to 150 parts by weight of finely divided silica, 80 to 120 parts by weight of a coloring pigment, 20 to 90 parts by weight of an extender pigment, 2 to 10 parts by weight of a light stabilizer, 2 to 10 parts by weight of a polymerization accelerator, 2 to 10 parts by weight of an anti-settling agent 2 based on 100 parts by weight of calcium carbonate to 10 parts by weight of a second adhesive in which 2 to 10 parts by weight of a dispersant are mixed;
Concrete repair and reinforcement construction method using a composition for concrete repair and reinforcement, characterized in that it comprises a.
4. The method of claim 3,
The adhesive used in the adhesive application step (S50) is,
an additive comprising at least one of an antifoaming agent, a flame retardant, a plasticizer and an antioxidant;
Concrete repair and reinforcement construction method using a composition for concrete repair and reinforcement, characterized in that it comprises a.

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