KR101364077B1 - Protecting method of cross-section of concrete structure using eco-friendly cross-section repairing mortar and surface protecting material - Google Patents

Abstract

The present invention relates to a method for repairing and protecting a damaged cross-section of a concrete structure and more specifically, to a method for repairing and protecting a damaged cross-section of a concrete structure applying a surface protecting material to the surface thereof after applying a mortar composition manufactured of a binding material based on industrial byproducts to the cross-section of concrete when a concrete structure having a cross-section to be repaired is repaired. According to the present invention, the method for repairing and protecting a damaged cross-section can gradually suppress neutralization by performing self-protection as time goes by after the repair construction; can be used for repair and reinforcement of concrete in the water, such as seawater, by the large screening effect of chloride ions; can improve economical effects and improve structural precision by recycling resources wasted as industrial byproducts; can increase adhesion strength on concrete; can reinforce weather resistance and material properties, detoxify cement, and block alkaline substances; and can maximize protection and repair effects by processing, on the surface, a surface protecting material including natural stone powder.

Description

Protective method of cross-section of concrete structure using eco-friendly cross-section repairing mortar and surface protecting material}

The present invention relates to a repair protection method of the cross section of a concrete structure, and more particularly, the shielding effect against chloride ions is large, so the durability is excellent, and because it has a fast diameter characteristic, the repair and repair construction can be completed in a short time, it is economical, mortar By coating the surface with a surface protective agent to improve the weather resistance and surface strength, and by using the industrial by-products as the main raw material, the present invention relates to an eco-friendly repair and protection method of eco-friendly concrete structure cross section.

Reinforced concrete structures are deteriorated in durability and usability in the long term due to deterioration of structures due to salt corrosion, neutralization, alkali aggregate reaction, chemical corrosion as well as corrosion expansion of steel due to penetration of water. As the deterioration of these structures continues, there is a risk of eventual collapse of the structures, so it is necessary to continuously manage and repair them.

Since the detachment of the structure surface or the occurrence of initial defects or cracks facilitates the movement of deterioration factors and promotes the progress of deterioration, it is necessary to carry out maintenance and reinforcement at the beginning of deterioration to further stabilize the performance of the reinforced concrete structure. And it is necessary to improve durability performance.

Therefore, in order to restore the section to its original performance and shape after removing the concrete part including deterioration factors such as deterioration factor of deterioration such as deterioration of concrete, corrosion of steel and other factors, It is general to carry out repair by construction.

Conventional reinforcement for repairing the cross section mainly used cement mortar or polymer cement mortar, such conventional reinforcement reinforcement for the purpose of suppressing the deterioration of the existing structure and improve the durability of the current or higher, or increase the strength Since most of them focused only on improving the adhesion performance during construction, there was a problem that frequent reinforcement work was required because the surface was easily damaged again after the construction.

As an example, Korean Patent Laid-Open Publication No. 2006-0079447 proposes a method for preparing a mortar composition by adding a calcium sulfoaluminate (CSA) and a predetermined fine powder binder. However, the mortar composition prepared by using the material uses expensive Auyne-based cement, which causes an increase in construction cost and does not obtain sufficient results in terms of initial setting time and strength.

In addition, when it is installed by the existing repair reinforcement method, since moisture and oxygen penetrate into the minute gaps on the surface, corrosion of reinforcing bars by oxygen progresses and concrete deterioration occurs by moisture, so the repair reinforcement effect is difficult to last for a long time. Therefore, there was a problem that the maintenance reinforcement work should be frequently performed.

On the other hand, due to the rapid development of the modern industry, a large amount of industrial waste is generated, and the treatment of such industrial waste is mostly dependent on landfilling. Such treatment by landfill can cause secondary environmental problems, so research for recycling industrial waste has been of great interest.

The present invention was developed in consideration of the situation of the prior art as described above, in repairing a concrete structure that requires repair of the cross-section, over time after the repair work to exhibit a self-defense function to suppress the neutralization as well as The shielding effect of chloride ions can be used for repair work on underwater concrete such as seawater. By recycling the waste materials as industrial by-products, it can increase the economic effect, improve structural compactness and increase adhesion strength with concrete. And it is to provide an environmentally friendly repair protection method of the cross section of the concrete structure that can maximize the protection effect by treating the surface of the mortar with a surface protector that can enhance the physical properties and at the same time improve the surface protection function.

In order to achieve the above object,

(1) chipping the cross section of the concrete structure in need of repair until the undamaged portion is trimmed;

(2) 5 ~ 85% by weight of cement, blast furnace quenching slag and blast furnace quenching slag were mixed in the weight ratio of 7-9: 1-3, and the average particle size of the synthetic slag fine powder 5 ~ 45% by weight, 5-30% by weight of glass powder having a powder degree of 1,000-3,000 cm ² / g, 3-20% by weight of shrinkage reducing agent, 0.5-1.5% by weight of polymer resin, 0.2-2% by weight of fiber and alkali activator Applying a mortar composition comprising 100 parts by weight of a binder composed of 0.1 to 5% by weight, 20 to 100 parts by weight of silica sand and water; And

(3) An amine-modified unsaturated polyester resin obtained by reacting an intermediate obtained by a condensation reaction of a polyhydric alcohol with a polybasic acid and a polyamine on a surface to which the mortar composition has been applied is subjected to dipentaerythritol polyacrylate and trimethylolpropane triacrylate. Applying a surface protecting agent comprising 100 parts by weight of the modified unsaturated polyester resin obtained by polymerization, 10 to 35 parts by weight of the crosslinkable monomer, and 10 to 50 parts by weight of one or more natural stone powders selected from sericite, s Korea and ocher

Provides an environmentally friendly repair protection method of the concrete structure cross section including a.

Referring to the features and advantages of the environmentally friendly repair protection method of the concrete structure cross section according to the present invention.

1. First, since the mortar composition including the synthetic slag fine powder composed of blast furnace quenching slag and blast furnace slow cooling slag is an optimal ratio, the surface becomes dense, which prevents the penetration of chloride ions and suppresses neutralization, thereby increasing durability.

2. By using fine powder glass powder together with cement and slag, it can accelerate the pozzolanic reaction and shorten the setting time and improve the adhesion stability with the ground concrete.

3. In addition, by using a shrinkage reducing agent in which calcium sulfoaluminate and gypsum are mixed in an optimum ratio, the shrinkage expandability of the composition can be lowered and the strength can be expressed quickly.

4. By coating and curing the mortar surface with a surface protective agent after mortar coating, it is possible to enhance weather resistance and surface strength and to improve water resistance. Accordingly, there is an advantage that the protection effect for the building installed outdoors is further enhanced.

5. In addition, by containing a certain amount of natural stone powder in the surface protector to provide far-infrared radiation, deodorization, antibacterial, anti-mold effect, to block the odor and alkalinity peculiar to cement and to protect the repaired concrete section by decomposing and removing the toxicity of cement. The natural stone powder can strongly adhere to the mortar surface as the surface protecting agent is cured, thereby exerting its function.

6. In addition, since mortar using industrial by-products is used as a main raw material, it is possible to reduce costs by reducing raw material costs, and it is an environmentally friendly method because it can reduce the disposal cost of industrial waste and use it as a new solution.

Hereinafter, the present invention will be described in more detail.

As described above, the environmentally friendly repair protection method of the cross section of the concrete structure according to the present invention includes the following three steps. In other words,

(1) chipping the cross section of the concrete structure in need of repair until the undamaged portion is trimmed;

(2) 5 ~ 85% by weight of cement, blast furnace quenching slag and blast furnace quenching slag were mixed in the weight ratio of 7-9: 1-3, and the average particle size of the synthetic slag fine powder 5 ~ 45% by weight, 5-30% by weight of glass powder having a powder degree of 1,000-3,000 cm ² / g, 5-20% by weight of shrinkage reducing agent, 0.5-1.5% by weight of polymer resin, 0.2-2% by weight of fiber and alkali activator Applying a mortar composition comprising 100 parts by weight of a binder composed of 0.1 to 5% by weight, 20 to 100 parts by weight of silica sand and water; And

(3) An amine-modified unsaturated polyester resin obtained by reacting an intermediate obtained by a condensation reaction of a polyhydric alcohol with a polybasic acid and a polyamine on a surface to which the mortar composition has been applied is subjected to dipentaerythritol polyacrylate and trimethylolpropane triacrylate. Applying a surface protecting agent comprising 100 parts by weight of the modified unsaturated polyester resin obtained by polymerization, 10 to 35 parts by weight of the crosslinkable monomer, and 10 to 50 parts by weight of one or more natural stone powders selected from sericite, s Korea and ocher. It is composed.

Hereinafter, it will be described in detail by dividing each step.

1. Chipping of concrete structures

When cracks are generated in concrete due to deterioration in concrete structure, the compressive strength of concrete and tensile strength of reinforcing steel gradually decrease over time. Concrete exposed to cracks is neutralized and corrosion of reinforcing steel occurs. If such a phenomenon occurs with safety diagnosis and inspection, the section of the concrete structure must be repaired to maintain the life of the building for a long time.

The chipping step is a process of crushing and trimming the cross section using a machine until the undeteriorated concrete is released by removing the cracked concrete and exposed reinforcement for the concrete structure that needs repair as a result of safety diagnosis and inspection. In this case, the outermost surface of the refined concrete is preferably provided with a rough surface so as to facilitate the attachment of the mortar.

2. Application of mortar composition

Chipping the concrete cross section to remove the concrete and corrosion of the deterioration site and then to repair by applying a mortar composition.

The mortar composition used in the present invention uses the following composition to recycle industrial waste and secure fastness and adhesion strength with concrete structures.

That is, 40 to 85% by weight of cement, blast furnace quenching slag and blast furnace slow cooling slag were mixed in a weight ratio of 7 to 9: 1 to 3, and 5 to 45% by weight of synthetic slag fine powder having an average particle diameter of 2 to 10 μm, and a powder degree of 1,000. 5-30 wt% of glass powder having 3,000 cm ² / g, 3-20 wt% of shrinkage reducing agent, 0.5-1.5 wt% of polymer resin, 0.2-2 wt% of fiber and 0.1-5 wt% of alkali activator Mortar composition comprising 100 parts by weight of the binder, 20 to 100 parts by weight of silica sand and water is used.

In the present invention, the cement may be Portland cement, slag cement, alumina cement or quick-setting cement. Preferably, the cement is Portland cement. Specifically, in case of Portland cement, the main components are C ₃ S 51%, C ₂ S 25%, C ₃ A 9%, C ₄ AF 9%, CaSO ₄ 4%, and the specific surface area is about 3,300 cm ² / g.

In the present invention, the synthetic slag cement is obtained as a by-product when producing pig iron in an ironworks, and is a mixture of blast furnace quenching slag generated by quenching and blast furnace slow cooling slag produced by slow cooling in a weight ratio of 7-9: 1 to 3 on average. It is obtained by grinding using a ball mill, a roller mill or a vibration mill so that the particle diameter is 2 ~ 10㎛ level.

The blast furnace quenching slag powder is an amorphous latent hydraulic material, and is mainly used as a mixed material for concrete, and its advantages include suppression of temperature rise by heat of hydration, suppression of alkali silica reaction, and improvement of chemical resistance to sulfate and seawater. As you might expect, neutralization resistance is weak. On the other hand, the blast furnace slow cooling slag fine powder is not cooled in the crystallized state by slow cooling, and the filler without the hydraulic property may exhibit a neutralizing inhibitory effect. In addition, by applying a material that reacts with the CO ₂ gas that causes neutralization rather than a simple filler, the surface of the cured body may be further densified by the carbonation reaction, thereby preventing the CO ₂ gas from permeating into the cured body thereafter. Merrilite, the main component of slow cooling slag, does not hydrate but exhibits carbonation reaction and densifies the structure, thereby making it difficult for CO ₂ gas to penetrate to the surface of the cured body. Therefore, in order to have high durability, the hydrophobic quenching slag fine powder and the non-hydraulic blast furnace slow cooling slag fine powder are mixed to take advantage of the blast furnace quenching slag fine powder while supplementing the vulnerable to neutralization with the blast furnace slow cooling slag fine powder, which is a non-hydrophobic material. can do.

In the step of preparing a binder in the present invention, the synthetic slag fine powder is preferably composed of 5 to 45% by weight. If the synthetic slag fine powder is less than 5% by weight it is difficult to secure the durability to obtain, if it exceeds 45% by weight it takes a long time to obtain the required strength and difficult to express the appropriate physical performance. In addition, in the present invention, the synthetic slag fine powder is preferably used by selecting those having an average particle diameter in the range of 2 ~ 10㎛.

In addition, in the present invention, the glass powder is composed of silica (SiO ₂ ) component of more than 70% of the chemical composition, and the pozzolanic action is activated during the hydration reaction with cement, excellent bonding to the concrete structure To increase the strength and improve the workability.

In the present invention, the glass powder is preferably used as a fine powder that is discharged as industrial by-products in order to recycle industrial waste. Recycled glass, one of the industrial by-products, has a lower recycling rate than the developed countries in Korea. It is mainly recycled by road pavement, interior and exterior materials, and road surface painting, but about 30% of the waste glass is not recycled and is buried in the ground. It is causing a problem. In addition, in order to solve such problems at home and abroad, a number of studies have been conducted as part of the construction materials, but most of them remain at the level of replacing aggregate in concrete. The present invention provides a technique for utilizing the waste glass as a mortar for reinforcing concrete cross section.

In the present invention, the glass powder is preferably used in the content of 5 to 10% by weight of the binder. If the content is less than 5% by weight, the compressive strength falls, and if it exceeds 30% by weight, the compressive strength and workability are lowered.

In more detail with respect to the function and effect of the glass powder, the glass powder whose silica component is the main component has a latent hydraulic properties, the latent hydraulic properties do not harden itself, but in the presence of water calcium hydroxide (Ca ( Pozzolan action is possible because it has a property of reacting with OH) ₂ ) to produce and harden a stable insoluble compound. That is, the calcium oxide (CaO) component in the blast furnace slag powder reacts with water to form calcium hydroxide (Ca (OH) ₂ ) and slowly reacts with silica (SiO ₂ ) and aluminum oxide (Al ₂ O ₃ ) eluted from the glass powder. Thus, insoluble calcium silicate hydrate (CSH gel) or calcium aluminate hydrate (CAH gel) is formed to make the structure more dense, contributing to the strength expression and strengthening of the concrete. The glass powder used in the present invention varies in performance depending on the degree of powder, but in the present invention, it is preferable to use a glass powder having a powder degree of 1,000 to 3,000 cm ² / g. When the powder level is less than 1,000 cm ² / g it may be difficult to control the pozzolanic reaction, and when the powder degree is more than 3,000 cm ² / g may be reduced binding force with the concrete structure.

In addition, in the present invention, the shrinkage reducing agent may be prepared by mixing calcium sulfoaluminate and gypsum in a weight ratio of 4 to 9: 1 to 6, the use amount is preferably 3% to 20% by weight of the binder. . If the content is less than 3% by weight it is difficult to control the crack due to the initial shrinkage expansion, if it exceeds 20% by weight it is difficult to secure the working time due to the rapid reaction and there is a problem that can cause abnormal expansion. In the present invention, the gypsum may be selected from phosphate anhydride or hydrofluoric anhydride.

In addition, in the present invention, the polymer resin increases the fluidity and improves workability in the state before curing of the mortar composition for cross-sectional reinforcement of the concrete structure, and in the state after curing, surface adhesion increases, cohesion increases, flexural strength increases, flexibility. It can exert effects such as enhancement and waterproofing. In the present invention, the polymer resin is ethylene vinyl acetate (Ethylene Vinyl Acetate, EVA), NR (Natural Rubber), NBR (Natural Rubber-Butadien Rubber), SBR (Styrene-Butadien Rubber) and polyvinyl acetate (Polyvinyl) Acetate) any one or a mixture of two or more selected from the resin can be used.

In the present invention, the polymer resin is preferably included in a proportion of 0.5 to 1.5% by weight in the binder. When the content of the polymer resin is used less than 0.5% by weight it is difficult to achieve the effect of strengthening the surface adhesion, if the content exceeds 1.5% by weight exhibits a disadvantage that the strength is reduced by preventing the formation of the hydration product during the hydration reaction.

In addition, in the present invention, the fiber is effective in the initial construction stability after the mortar, and can be used for the purpose of increasing the initial dispersibility, since the fiber can reduce the surface cracks during curing as well as increase the bending strength, tensile strength. As the fibers that can be used in the present invention, one or more fibers selected from cellulose fibers, polypropylene fibers and polyethylene fibers can be used. In addition, in the present invention, the fiber is preferably included in the range of 0.2 to 2% by weight in the binder. If the content is less than 0.2% by weight, the effect of improving the tensile strength and the flexural strength is not seen, and when the content exceeds 2% by weight, the workability may be worsened and the economical efficiency may be reduced due to the increase in the amount of water used.

In addition, the alkali activator in the present invention as a factor affecting the strength expression, may be used any one or a mixture of two or more selected from alkali metal hydroxides, chlorides, sulfur oxides and carbonates, preferably sodium carbonate and carbonic acid The use of sodium hydrogen is advantageous in terms of strength development. In the present invention, the alkali activator is included in the binder and the content is preferably included in the range 0.1 to 5% by weight. When the content of the alkali activator is less than 0.1 wt% or more than 5 wt%, the strength of the mortar may be lowered.

In addition, an underwater separating agent may be additionally added in the range of 0.1 to 3 wt% for maintenance and reinforcement of an underwater concrete structure. The underwater bleaching agent is added to prevent the degradation of the mortar composition by improving the viscosity of the mortar composition. Examples thereof include methylcellulose such as methylcellulose, hydroxymethylcellulose and carboxymethylcellulose; Ethyl celluloses such as ethyl cellulose, hydroxyethyl cellulose and carboxyethyl cellulose; Cellulose type thickeners selected from propyl cellulose such as hydroxypropyl cellulose can be used. The content is preferably included in 0.1 to 3% by weight of the binder because it expresses the appropriate viscosity. If necessary, a water-soluble acrylic resin powder may be further added to further increase the viscosity in water. The water-soluble acrylic resin powder is preferably used in 1 to 30% by weight of the water-insoluble agent.

If necessary, it may further comprise at least one additive selected from 0.1 to 10 parts by weight of a dispersant, 0.01 to 3 parts by weight of a defoamer, and 0.01 to 10 parts by weight of a retarder based on 100 parts by weight of the binder.

The dispersant is adsorbed on the particle surface of the mortar to give a charge to the particle surface to cause mutual reaction between the particles, it is possible to increase the flow by dispersing the aggregated particles to increase the flow due to the water-reducing effect. As the dispersing agent, a conventional water reducing agent can be used, and it can be used singly or in a mixture of two or more thereof, for example, from the group consisting of lignin sulfonate, polynaphthalene sulfonate, polymelamine sulfonate or polycarboxylate type water reducing agent. The content of the dispersant is preferably used 0.1 to 10 parts by weight based on 100 parts by weight of the binder.

The antifoaming agent is used to remove macropores in the mortar to improve the strength and appearance of the mortar. Antifoaming agents include mineral oil defoamers such as kerosene and liquid paraffin; Oil-based antifoaming agents such as animal and vegetable oils, sesame oil, castor oil and their alkylene oxide adducts; Fatty acid-based antifoaming agents such as oleic acid, stearic acid and alkylene oxide adducts thereof; Fatty acid ester antifoaming agents such as glycerin monolicinolate, alkenyl amber acid fluid, sorbitol monolaurate, sorbitol trioleate, natural wax and the like; Polyoxyalkylenes, (poly) oxyalkyl ethers, acetylene ethers, (poly) oxyalkylene fatty acid esters, (poly) oxyalkylene sorbitan fatty acid esters, (poly) oxyalkylene alkyl (aryl) ethers Oxyalkylene antifoaming agents such as sulfuric acid ester salts, (poly) oxyalkylene alkyl phosphate esters, (poly) oxyalkylene alkylamines, and (poly) oxyalkylene amides; Alcohol antifoaming agents such as octyl alcohol, hexadecyl alcohol, acetylene alcohol, glycols, and the like; Amide antifoaming agents such as acrylate polyamine; Phosphate ester defoaming agents such as tributyl phosphate and sodium octyl phosphate; Metal soap-based antifoaming agents such as aluminum stearate and calcium oleate; Silicone antifoaming agents such as dimethylsilicone oil, silicone paste, silicone emulsion, organomodified polysiloxane (polyorganosiloxane such as dimethylpolysiloxane), fluorosilicone oil and the like can be used. The antifoaming agent is preferably used 0.01 to 3 parts by weight based on 100 parts by weight of the binder.

The retarder may be added for the purpose of securing a workability for a certain period of time by adjusting the hydration rate of the binder. Examples of retardants include borates such as boric acid and borax, sodium borate, potassium borate, gluconic acid, citric acid, tartaric acid, glucoheptonic acid, arabic acid, malic acid or citric acid, and their sodium, potassium, calcium, magnesium, ammonium and triethanolamine Oxycarboxylic acid, such as inorganic salts or organic salts, such as these; Monosaccharides such as glucose, fructose, galactose, saccharose, xylose, abitose, lipoose and isosaccharides, oligosaccharides such as disaccharides and trisaccharides, oligosaccharides such as dextrins, and polysaccharides such as dextran, Sugars such as molasses containing these; Sugar alcohols such as sorbitol; Magnesium silicate; Phosphoric acid and its salts or boric acid esters; Aminocarboxylic acids and salts thereof; Alkali soluble protein; Fumic acid; Tannic acid; phenol; Polyhydric alcohols such as glycerin; Aminotri (methylenephosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, ethylenediaminetetra (methylenephosphonic acid), diethylenetriaminepenta (methylenephosphonic acid) and alkali metal salts thereof, alkali Phosphonic acids such as earth metal salts and derivatives thereof. The content is preferably added 0.01 to 10 parts by weight based on 100 parts by weight of the binder.

The present invention is a dry mortar premix composition by mixing the silica sand in a binder consisting of a mixture of cement, blast furnace quench slag and blast furnace slow cooling slag, glass powder, shrinkage reducing agent, polymer resin, fiber and alkali activator as described above To prepare a mixture of water to form a mortar composition. In the present invention, the binder and the silica are preferably mixed in a proportion of 100 parts by weight of the binder and 20 to 80 parts by weight of the silica sand. In addition, the amount of water used may be included in 5 to 40 parts by weight, but can be changed according to use.

In the present invention, the silica sand is not particularly limited, but a mixture of middle yarns having an average particle diameter of 10 to 20 mm and fine yarns having an average particle diameter of 0.1 to 1.0 mm may be used in a ratio of 1: 4 to 2: 3, respectively. If the average particle diameter and content of the silica sand is in the above range, the fluidity and density of the mortar composition may be improved.

Applying the mortar composition obtained as described above to the construction target surface of the concrete structure

To reinforce the cross-section, if repeated one or more times, the surface is polished and roughly finished for adhesion to the target surface, and the coating is performed by spraying or troweling 5 to 15 mm, secondary and It is preferable to construct and plaster 20 to 50 mm at the time of tertiary casting and 5 to 15 mm at the final pouring, but the thickness can be changed according to the thickness of the chipped concrete.

3. Apply surface protectant

The mortar composition is applied to the concrete crushing site to smoothly finish and dry the thin surface protector according to the present invention on the surface to protect the repaired surface from external conditions.

The surface protective agent according to the present invention is prepared in the following order. That is, first, an intermediate is prepared by condensation reaction of a polyhydric alcohol and a polybasic acid, and an amine-modified unsaturated polyester resin is prepared by reacting the polymer and polyamine prepared above, and then, the prepared amine-modified unsaturated polyester resin is dipentaerythritol. Polymerized with polyacrylate and trimethylolpropanetriacrylate to produce a modified unsaturated polyester resin, a crosslinkable monomer is mixed with the modified unsaturated polyester, and natural stone powder is mixed with the surface protective agent of the mortar composition of the present invention. use.

In the present invention, the polyhydric alcohol may be at least one selected from the group consisting of ethylene glycol, propylene glycol, 2-butyl-2-ethyl-1,3-propanediol, neopentyl glycol, 1,3-butylene glycol, Dihydroxy-2,2-dimethylpropyl ester, diethylene glycol, trimethylolethane, trimethylolpropane, glycerin, and the like can be used.

In the present invention, the polybasic acid may be an unsaturated polybasic acid and a saturated polybasic acid. The unsaturated polybasic acid may be at least one selected from the group consisting of fumaric acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, tetrahydrophthalic acid, anhydrous tetrahydrophthalic acid, tetrabromophthalic anhydride, tetrachlorophthalic anhydride, chlorendicacid, and itic acid, and the saturated polybasic acid may be selected from the group consisting of methyl tetrahydrophthalic anhydride, phthalic acid, phthalic anhydride, halogenated phthalic anhydride, isophthalic acid, terephthalic acid, hexahydrophthalic acid, hexahydrophthalic anhydride , Hexahydroterephthalic acid, hexahydroisophthalic acid, succinic acid, malonic acid, glutaric acid, adipic acid, sebacic acid, 1,12-dodecane diacid, 2,6-naphthalene dicarboxylic acid, 2,7- Naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid anhydride, and 4,4'-biphenyldicarboxylic acid.

Or a mixture of two or more thereof.

In the present invention, the polyamine may use one or more mixtures selected from 1,3-diaminopropane, methylamine, ethylamine, dimethylamine, diethylamine, trimethylamine, ethylenediamine, and diethylenetriamine. .

The dipentaerythritol polyacrylate used in the present invention may be selected from among dipentaerythritol pentaacrylate, dipentaerythritol diacrylate and dipentaerythritol hexaacrylate.

In the present invention, the intermediate obtained by the condensation reaction of the polyhydric alcohol and the polybasic acid may be produced by condensation reaction of 40 to 45% by weight of a polyhydric alcohol, 20 to 30% by weight of a saturated polybasic acid and 25 to 35% by weight of an unsaturated polybasic acid. In addition, it is possible to obtain intermediates having a Gardner bubble point of N to O and an acid value of 8 to 14 mmKOH / g by measuring sampling time 60% IN SM in the reaction process and checking the reaction degree.

The condensation reaction of the intermediate is preferably in the range of 150 to 200 ° C. to prevent gelation, and the bubble viscosity is N to O, and the acid value is preferably in the range of 8 to 14 mmKOH / g in view of dryness, water resistance and adhesion.

Subsequently, an amine-modified unsaturated polyester resin is synthesized by reacting a reactant containing 0.1 to 10 parts by weight of a polyamine with 100 parts by weight of the synthesized intermediate. At this time, if the content of the polyamine is less than 0.1 parts by weight, it may not give sufficient stability to the particles of the modified unsaturated polyester resin to be produced, there is a fear that a coagulated product is produced after the reaction, if it exceeds 10 parts by weight, the water resistance in the final physical properties There exists a possibility that it will fall and a cured coating film is fragile.

Subsequently, the synthesized amine-modified unsaturated polyester resin is polymerized with dipentaerythritol polyacrylate and trimethylolpropane triacrylate to prepare a modified unsaturated polyester resin. In this case, the dipentaerythritol polyacrylate is 0.1 to 5 parts by weight based on 100 parts by weight of the amine-modified unsaturated polyester resin, 15 to 25 parts by weight of the trimethylolpropane triacrylate is added to the modified unsaturated polyester resin It can manufacture. When the content of trimethylolpropane triacrylate is less than 15 parts by weight or more than 25 parts by weight when the modified unsaturated polyester resin is produced, weatherability and surface hardness may be lowered, and when the content of the pentaerythritol polyacrylate is less than 0.1 When the amount is less than 5 parts by weight, the crosslinking property is lowered and the surface hardness is lowered. When the amount is more than 5 parts by weight, weatherability and thixotropy may be lowered.

The prepared unsaturated unsaturated polyester resin has a viscosity of 3 to 9 Poise (25 ° C, Brookfield viscometer), 80 to 90% of nonvolatile content, and an acid value of 5 to 13 mmKOH / g. When the viscosity, the nonvolatile content and the acid value of the modified unsaturated polyester resin are within the above ranges, they are preferable in terms of surface hardness, curability, water resistance and thixotropy.

The surface protecting agent in the present invention is based on a mixture of the modified unsaturated polyester resin and the crosslinkable monomer prepared above, and the mixing ratio is 100 parts by weight of the modified unsaturated polyester resin and 10 to 35 parts by weight of the crosslinkable monomer. . When the content of the crosslinkable monomer is less than 10 parts by weight, the surface hardness, heat resistance and curability are poor. When the amount is more than 20 parts by weight, the cured coating film is easily broken and adhesion and thixotropy may be poor.

In the present invention, the crosslinkable monomer may be selected from the group consisting of styrene, acrylonitrile, acrylic imide, diacetone acryl imide, methyl acrylate, butyl methacrylate, lauryl methacrylate, acrylic acid, methyl methacrylate, It is preferably selected from butyl acrylate, ethyl methacrylate, glycidyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, trimethylol propane triacrylate and hydroxypropyl acrylate Do.

In addition, the surface protectant of the present invention further comprises a natural stone powder to protect the mortar surface. The natural stone powder is used at least one selected from sericite, s Korea, ocher and its content is preferably used in 10 to 50 parts by weight based on 100 parts by weight of the modified unsaturated polyester resin. More preferably, the natural stone powder is preferably composed of three kinds of mixtures of sericite, s Korea, ocher and the size of the powder may be used in the range of 0.01 ~ 10 ㎛, each mixing ratio is 30 ~ 60: 20 ~ It is preferable to mix in the weight ratio of 50: 20-50.

The sericite, s Korea and loess are materials having excellent far-infrared radiation function, the sericite and s Korea are porous materials and have excellent deodorizing, antimicrobial and antifungal properties, and the loess has beneficial microorganisms and enzymes. It can block alkaline substances and has the function of decomposing and removing the toxicity of cement. Such natural stone powder requires a material such as a coupling agent because phase separation occurs in a general paint and is not easily combined with the paint component. In the present invention, a main component consisting of an unsaturated polyester resin component and a monomer component without an auxiliary component such as a coupling agent is required. In the process of hardening after application, it is strongly bonded with the resin component and exhibits strong adhesive force between the tissues and binding force due to penetration, thereby densifying the tissue. Therefore, the surface smoothness is improved, and physical properties such as waterproofness, tensile strength, compressive strength, and heat resistance are also improved.

In addition, the surface protective agent of the present invention may include various additives in a range that does not impair the effects of the present invention, additives such as thixotropic agents such as silica, pigments, defoamers, organic modifiers and the like can be used. Moreover, normal temperature hardening and heat hardening can be made easy by adding a hardening accelerator in the range which does not affect resin color in manufacturing a surface protecting agent. Examples of the curing accelerators include metal soaps such as cobalt naphthenate, cobalt octylate, zinc octylate, vanadium octylate, copper naphthenate and barium naphthenate, vanadium acetylacetate, cobaltacetyl acetate, and iron acetylacetonate. Metal chelates such as aniline, N, N-dimethylaniline, N, N-diethylaniline, p-toluidine, N, N-dimethyl-p-toluidine, N, N-bis (2-hydroxyethyl)- p-toluidine, 4- (N, N-dimethylamino) benzaldehyde, 4- [N, N-bis (2-hydroxyethyl) amino] benzaldehyde, 4- (N-methyl-N-hydroxyethylamino) benzaldehyde , N, N-bis (2-hydroxypropyl) -p-toluidine, N-ethyl-m-toluidine, triethanolamine, m-toluidine, diethylenetriamine, pyridine, phenylmorpholine, piperidine, N, N, N-substituted aniline, such as N-bis (hydroxyethyl) aniline and diethanol aniline, N, N-substituted-p-toluidine, 4- (N, N-substituted amino) benzal It may be mentioned amines such as hydroxide. As for the said hardening accelerator, the range of 0.1-5 weight part is suitable with respect to 100 weight part of modified unsaturated polyester resins. Preferably, cobalt naphthenate (Co-Naph) may be used.

The surface protective agent according to the present invention is excellent in weathering resistance, surface strength and water resistance reinforcing effect by only one coating, but it is preferable to repaint two or three times in order to achieve the optimal function. In the present invention, the surface protective agent is applied to 20 ~ 200g / m ² and the coating thickness is preferably applied to a thickness of 50 ~ 300㎛ in the step before drying.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the following examples.

[Example]

Preparation Example 1 Preparation of Mortar Composition

50 parts by weight of Portland cement, blast furnace quenching slag and blast furnace slow cooling slag were mixed in a weight ratio of 8: 2, and 20 parts by weight of synthetic slag fine powder having an average particle diameter of 2 to 10 μm, and having a powder degree of about 2,000 cm ² / g 15 parts by weight of powder, 5 parts by weight of shrinkage reducing agent mixed with calcium sulfoaluminate and phosphate anhydride in a weight ratio of 7: 3, 1.0 part by weight of polymer resin (EVA resin), 1.0 part by weight of cellulose fiber and 0.5 weight part of sodium hydrogencarbonate Part was mixed to prepare a binder.

55 parts by weight of silica sand mixed with a medium sand of 10 to 20 mm and a fine sand of 0.1 to 1.0 mm in a ratio of 2: 3 to 100 parts by weight of the binder, 9.5 parts by weight of limestone (Gyeonggi Mining) and 20 parts by weight of water To prepare a mortar composition.

Preparation Example 2 Preparation of Mortar Composition

50 parts by weight of Portland cement, blast furnace quenching slag and blast furnace slow cooling slag were mixed in a weight ratio of 8: 2, and 20 parts by weight of synthetic slag fine powder having an average particle diameter of 2 to 10 μm, and having a powder degree of about 2,000 cm ² / g 15 parts by weight of powder, 5 parts by weight of shrinkage reducing agent mixed with calcium sulfoaluminate and phosphate anhydride in a weight ratio of 7: 3, 1.0 part by weight of polymer resin (EVA resin), 1.0 part by weight of cellulose fiber, 0.5 weight part of sodium hydrogencarbonate The binder was prepared by adding 0.5 parts by weight of a water-insoluble agent (methyl cellulose), 0.5 parts by weight of a dispersant (PC-based), 0.2 parts by weight of an antifoaming agent, and 0.05 parts by weight of a retarder (tartaric acid).

55 parts by weight of silica sand mixed with a medium sand of 10 to 20 mm and a fine sand of 0.1 to 1.0 mm in a ratio of 2: 3 to 100 parts by weight of the binder, 9.5 parts by weight of limestone (Gyeonggi Mining) and 20 parts by weight of water To prepare a mortar composition.

Comparative Preparation Example 1 Preparation of Mortar Composition

Only portland cement was used as binder.

55 parts by weight of silica sand mixed with a medium sand of 10 to 20 mm and a fine sand of 0.1 to 1.0 mm in a ratio of 2: 3 to 100 parts by weight of the portland cement binder, 9.5 parts by weight of limestone (Gyeonggi Mining) and water 20 Mix by weight to prepare a mortar composition.

Comparative Preparation Example 2 Preparation of Mortar Composition

65 parts by weight of Portland cement, blast furnace quenching slag and blast furnace slow cooling slag were mixed in a weight ratio of 8: 2. 20 parts by weight of synthetic slag fine powder having an average particle diameter of 2 to 10 μm, calcium sulfoaluminate and phosphate anhydrite 7: 3 A binder was prepared by mixing 5 parts by weight of a shrinkage reducing agent, 1.0 part by weight of a polymer resin (EVA resin), 1.0 part by weight of cellulose fibers, and 0.5 part by weight of sodium hydrogen carbonate.

55 parts by weight of silica sand mixed with a medium sand of 10 to 20 mm and a fine sand of 0.1 to 1.0 mm in a ratio of 2: 3 to 100 parts by weight of the binder, 9.5 parts by weight of limestone (Gyeonggi Mining) and 20 parts by weight of water To prepare a mortar composition.

Comparative Preparation Example 3 Preparation of Mortar Composition

65 parts by weight of Portland cement, blast furnace quenching slag and blast furnace slow cooling slag were mixed in a weight ratio of 8: 2. 20 parts by weight of synthetic slag fine powder having an average particle diameter of 2 to 10 μm, calcium sulfoaluminate and phosphate anhydrite 7: 3 5 parts by weight of the shrinkage reducing agent mixed with the weight ratio of the resin, 1.0 part by weight of the polymer resin (EVA resin), 1.0 part by weight of cellulose fiber and 0.5 part by weight of sodium bicarbonate, 0.5 part by weight of water-insoluble agent (methylcellulose), dispersant (PC System) 0.5 parts by weight, antifoaming agent 0.2 parts by weight, retarder (tartaric acid) 0.05 parts by weight were added and mixed to prepare a binder.

55 parts by weight of silica sand mixed with a medium sand of 10 to 20 mm and a fine sand of 0.1 to 1.0 mm in a ratio of 2: 3 to 100 parts by weight of the binder, 9.5 parts by weight of limestone (Gyeonggi Mining) and 20 parts by weight of water To prepare a mortar composition.

(Manufacture example 3) Surface protection agent manufacture

682 g of neopentyl glycol and 493 g of isophthalic acid were placed in a 5-liter flask equipped with a stirrer, a thermometer, a condenser, a condenser and a bead decanter and a dropping funnel, and the mixture was heated to 165 DEG C over 2 hours in a nitrogen gas atmosphere . At this time, when the condensation water is generated while the esterification reaction proceeds, the condensation water is removed through the condenser line while maintaining for 2 hours. After removing the condensed water, the mixture was heated up again for 2 hours, gradually stirred and heated, and heated at 215 ° C. Sampling was carried out every hour during the reaction to determine the solid acid value. When the solid acid value reached 2 mmKOH / g, the reaction was stopped and cooled to 100 ° C. 114g of propylene glycol and 544g of fumaric acid were further added at 100 ° C, and the temperature was raised to 165 ° C over 2 hours in a nitrogen atmosphere. At this time, when the condensation water was generated while the esterification reaction proceeded, the condensation water was removed through the condenser line while maintaining it for 1 hour. After the condensed water was generated, the mixture was heated up again for 3 hours, heated to 215 ° C, and reacted. In the course of reaction, 60% IN SM was sampled every hour to check the degree of reaction. It cooled by Gardner bubble viscosity N and acid value 11 mmKOH / g, and obtained the intermediate body. After removing the bead decanter from the flask, equipped with a dropping funnel, 79 g of 1,3-diaminopropane was added and stabilized at 90 ° C. to prepare an amine-modified unsaturated polyester resin. Thereafter, 59 g of dipentaerythritol hexaacrylate and 462 g of trimethylolpropane triacrylate, which were prepared in advance, were added to the dropping funnel, and then added dropwise while paying attention to the polymerization for a predetermined time for 2 hours, and a viscosity of 6 Poise, 85% of nonvolatile matter, and an acid value of 9 67.7 g of modified unsaturated polyester resin of mmKOH / g was synthesized. 67.7 g of the modified unsaturated polyester resin synthesized above, 2.5 g of fumed silica and 16.9 g of a pigment (titanium oxide, TMC-A100, Dongwoo TMC) were mixed and completely ground using a roller. Thereafter, 0.6 g of a defoaming agent (ODS Co., Ltd., Airex 945), 0.3 g of an organic thixotropic agent, 14.3 g of trimethylolpropane triacrylate, and 11.9 g of methyl methacrylate were added to obtain a main ingredient. Then, 10.15 g of a mixture of three kinds of sericite, scoria and loess (mixing ratio 40:40:20) was mixed and stirred to prepare a surface protecting agent.

(Manufacture example 4) Surface protection agent manufacture

In a 5-liter flask equipped with a nitrogen gas introduction tube, a stirrer, a thermometer, a cooling capacitor and a bead decanter, and a dropping funnel, 682 g of propylene glycol and 493 g of isophthalic acid were added thereto, and the temperature was raised to 165 ° C. over 2 hours in a nitrogen gas atmosphere. At this time, when the condensation water is generated while the esterification reaction proceeds, the condensation water is removed through the condenser line while maintaining for 2 hours. After removing the condensed water, the mixture was heated up again for 2 hours, gradually stirred and heated, and heated at 215 ° C. Sampling was carried out every hour during the reaction to determine the solid acid value. When the solid acid value reached 2 mmKOH / g, the reaction was stopped and cooled to 100 ° C. 114g of propylene glycol and 544g of fumaric acid were further added in sequence at 100 ° C, and the temperature was raised to 165 ° C over 2 hours in a nitrogen atmosphere. At this time, when the condensation water was generated while the esterification reaction proceeded, the condensation water was removed through the condenser line while maintaining for 1 hour. After the condensed water was generated, the mixture was heated up again for 3 hours, heated to 215 ° C, and reacted. In the course of reaction, 60% IN SM was sampled every hour to check the degree of reaction. It cooled by Gardner bubble viscosity N and acid value 11 mmKOH / g, and obtained the intermediate. After removing the bead decanter from the flask and equipped with a dropping funnel, 79 g of 1,3-diaminopropane was added and stabilized at 90 ° C. to prepare an amine-modified unsaturated polyester resin. Thereafter, 59 g of dipentaerythritol hexaacrylate and 462 g of trimethylolpropane triacrylate, which were prepared in advance, were added to the dropping funnel, and then added dropwise while paying attention to the polymerization for a predetermined time for 2 hours, and a viscosity of 6 Poise, 85% of nonvolatile matter, and an acid value of 9 A modified unsaturated polyester resin of mmKOH / g was synthesized. 67.7 g of the modified unsaturated polyester resin synthesized above, 2.5 g of fumed silica and 16.9 g of a pigment (titanium oxide, TMC-A100, Dongwoo TMC) were mixed and completely ground using a roller. Then, 0.6 g of a defoaming agent (ODS Co., Ltd., Airex 945), 0.3 g of an organic thixotropic agent, 14.3 g of trimethylolpropane triacrylate, and 11.9 g of methyl methacrylate were added to obtain a main ingredient. Then, 10.15 g of a mixture of three kinds of sericite, scoria and loess (mixing ratio 40:40:20) was mixed and stirred to prepare a surface protecting agent.

(Manufacture example 5) Surface protection agent manufacture

A 5-liter flask equipped with a nitrogen gas introduction tube, a stirrer, a thermometer, a cooling capacitor, a bead decanter, and a dropping funnel was charged with 682 g of neopentyl glycol and 493 g of isophthalic acid and heated to 165 DEG C over 2 hours in a nitrogen gas atmosphere. . At this time, when the condensation water is generated while the esterification reaction proceeds, the condensation water is removed through the condenser line while maintaining for 2 hours.

After removing the condensed water, the mixture was heated up again for 2 hours, gradually stirred and heated, and heated at 215 ° C. Sampling is carried out every hour during the reaction to determine the solid acid value. When the solid acid value reaches 2 mmKOH / g, the reaction is stopped and cooled to 100 ° C. 114 g of propylene glycol and 544 g of maleic anhydride were sequentially added at 100 ° C., and heated to 165 ° C. over 2 hours under nitrogen injection. At this time, when the condensation water was generated while the esterification reaction proceeded, the condensation water was removed through the condenser line while maintaining for 1 hour. After the condensed water is generated, the temperature is increased again over 3 hours, the temperature is raised to 215 ° C, and reacted. In the course of reaction, 60% IN SM was sampled every hour to check the degree of reaction. Gardner bubble viscosity N Acid value It cooled by 11 mmKOH / g, and produced the intermediate. After removing the bead decanter from the flask, equipped with a dropping funnel, 79 g of 1,3-diaminopropane was added and stabilized at 90 ° C. to prepare an amine-modified unsaturated polyester resin. Thereafter, 59 g of dipentaerythritol hexaacrylate and 462 g of trimethylolpropane triacrylate, which were prepared in advance, were added to the dropping funnel, and then added dropwise while paying attention to the polymerization for a predetermined time for 2 hours to obtain a viscosity of 4.5-8.5 (Poise) and a nonvolatile content 85. % And an acid value of 9 mmKOH / g modified unsaturated polyester resin were synthesized. 67.7 g of the modified unsaturated polyester resin synthesized above, 2.5 g of fumed silica and 16.9 g of a pigment (titanium oxide, TMC-A100, Dongwoo TMC) were mixed and completely ground using a roller. Then, 0.6 g of a defoaming agent (ODS Co., Ltd., Airex 945), 0.3 g of an organic thixotropic agent, 14.3 g of trimethylolpropane triacrylate, and 11.9 g of methyl methacrylate were added to obtain a main ingredient. Then, 10.15 g of a mixture of three kinds of sericite, scoria and loess (mixing ratio 40:40:20) was mixed and stirred to prepare a surface protecting agent.

Example 1

After chipping and crushing the cross section of the damaged concrete structure and removing the rusty reinforcing bars inside, the mortar composition prepared in Preparation Example 1 was applied to smooth the surface of the structure and dried. The surface protection agent prepared in Preparation Example 3 was applied to the dried mortar surface twice in thickness of 100 μm, and then cured and dried to finish the repair reinforcement work.

[Example 2]

After chipping and crushing the cross section of the damaged concrete structure, and after removing the rusty reinforcing bar inside, the mortar composition prepared in Preparation Example 2 was applied to the surface of the building smoothly and then dried. The surface protection agent prepared in Preparation Example 3 was applied to the dried mortar surface twice in thickness of 100 μm, and then cured and dried to finish the repair reinforcement work.

[Example 3]

After chipping and crushing the cross section of the damaged concrete structure and removing the rusty reinforcing bars inside, the mortar composition prepared in Preparation Example 1 was applied to smooth the surface of the structure and dried. The surface protection agent prepared in Preparation Example 4 was twice coated on the dried mortar surface to a thickness of 100 μm, and then cured and dried to finish the repair reinforcement work.

Example 4

After chipping and crushing the cross section of the damaged concrete structure and removing the rusty reinforcing bars inside, the mortar composition prepared in Preparation Example 2 was applied to smooth the surface of the structure and dried. The surface protection agent prepared in Preparation Example 4 was twice coated on the dried mortar surface to a thickness of 100 μm, and then cured and dried to finish the repair reinforcement work.

[Example 5]

After chipping and crushing the cross section of the damaged concrete structure and removing the rusty reinforcing bars inside, the mortar composition prepared in Preparation Example 1 was applied to smooth the surface of the structure and dried. The surface protection agent prepared in Preparation Example 5 was twice coated on the dried mortar surface to a thickness of 100 μm, and then cured and dried to finish the repair reinforcement work.

[Example 6]

After chipping and crushing the cross section of the damaged concrete structure and removing the rusty reinforcing bars inside, the mortar composition prepared in Preparation Example 2 was applied to smooth the surface of the structure and dried. The surface protection agent prepared in Preparation Example 5 was twice coated on the dried mortar surface to a thickness of 100 μm, and then cured and dried to finish the repair reinforcement work.

Comparative Example 1

The same procedure as in Example 1 was carried out except that the surface of the mortar composition prepared in Comparative Preparation Example 1 and a commercial epoxy resin coating agent (Sikafloor, 1004K) were used.

[Comparative Example 2]

The same procedure as in Example 1 was carried out except that the surface of the mortar composition prepared in Comparative Preparation Example 2 and a commercially available general epoxy resin coating agent (Sikafloor, 1004K) were used.

[Comparative Example 3]

The same procedure as in Example 1 was carried out except that the surface of the mortar composition prepared in Comparative Preparation Example 3 and a commercially available general epoxy resin coating agent (Sikafloor, 1004K) were used.

Performance evaluation

(1) Physical properties of mortar composition

Test specimens were prepared using the mortars prepared in Preparation Examples and Comparative Preparation Examples, and physical properties were measured by the following test methods.

1) Curing time: KSF 2436

2) Flexural strength: KS F 2476 "Method of testing the strength of polymer cement mortar"

3) Compressive strength: KSF 2405

4) Bonding strength: KS F 4716 `` Strength Test Method of Polymer Cement Mortar ''

5) Length change rate: Measured according to the test method for changing the length of mortar and concrete KS F 2424. The value is 0 for initial construction, “-” indicates shrinkage rate, and “+” indicates expansion rate.

6) Flow: Conducted according to KS L 5220

The results are shown in Table 1 below.

Item Production Example 1 Production Example 2 Comparative Preparation Example 1 Comparative Production Example 2 Comparative Production Example 3 Setting time (minutes) Fresh 30 31 120 53 60 closing 43 36 245 95 105 Flexural strength
(N / mm ² ) mourning 10 11 9 8 7 Underwater 8 9 8 7 6 Compressive strength
(N / mm ² ) mourning 60 65 46 49 51 Underwater 58 64 47 45 48 Bond strength
(N / mm ² ) mourning 3.0 3.2 3.5 1.0 2.2 Underwater 1.8 2.5 0.9 0.9 1.2 Length change rate (%) 0.001 0.002 -0.27 0.15 0.16 Flow (mm) 130 140 135 118 120

As shown in Table 1, in the case of the mortar composition using the binder according to the present invention, it can be confirmed that the physical properties are remarkably superior to the mortar composition when using the conventional portland cement as a binder or when the glass powder is not used. .

(2) Evaluation of section recovery performance

1) Weather resistance evaluation

400 hours were measured according to ASTM G 155.

2) surface hardness evaluation

Pencil hardness was measured according to KS D 6711.

3) Water resistance evaluation

The time at which surface deformation (cracks, blisters, etc.) occur continuously at 90 ° C. hot water was measured.

The evaluation results are shown in Table 2.

Weatherability (white) Surface hardness Water resistance Example 1 E1.5 4H 500 hr Example 2 E1.2 3H 450hr Example 3 E1.5 3H 480 hr Example 4 DELTA E1.0 4H 520hr Example 5 E1.5 3H 550hr Example 6 DELTA E1.0 4H 490hr Comparative Example 1 ? E3.0 3H 360hr Comparative Example 2 E3.5 3H 300hr Comparative Example 3 ? E3.0 2H 330hr

As shown in Table 2, when the concrete mortar composition was recovered using the mortar composition according to the present invention and the surface protective agent according to the present invention was applied to the surface thereof, the weather resistance of the conventional mortar composition and the conventional coating agent were used. It can be confirmed that surface hardness and water resistance are remarkably excellent.

Using the repair and reinforcement method of the concrete cross section according to the present invention from the results of Table 1 and Table 2, it is excellent in the performance of mortar, excellent adhesion to concrete, and also excellent in physical properties such as weather resistance, water resistance, etc. It can be confirmed that can be efficiently and can maintain the effect of the maintenance reinforcement for a long time.

In addition, the surface protective agent used in the present invention includes a natural stone powder component that can decompose the toxicity of the cement and block the alkaline substances, the natural stone powder component can be strongly bound to the mortar by the main component of the surface protective agent There is also an advantage to effectively protect the surface of the mortar recovered cross section.

Claims (9)

(1) chipping the cross section of the concrete structure in need of repair until the undamaged portion is trimmed;
(2) 5 ~ 85% by weight of cement, blast furnace quenching slag and blast furnace quenching slag were mixed in the weight ratio of 7-9: 1-3, and the average particle size of the synthetic slag fine powder 5 ~ 45% by weight, 5-30% by weight of glass powder having a powder degree of 1,000-3,000 cm ² / g, 3-20% by weight of shrinkage reducing agent, 0.5-1.5% by weight of polymer resin, 0.2-2% by weight of fiber and alkali activator Applying a mortar composition comprising 100 parts by weight of a binder composed of 0.1 to 5% by weight, 20 to 100 parts by weight of silica sand and water; And
(3) An amine-modified unsaturated polyester resin obtained by reacting an intermediate obtained by a condensation reaction of a polyhydric alcohol with a polybasic acid and a polyamine on a surface to which the mortar composition has been applied is subjected to dipentaerythritol polyacrylate and trimethylolpropane triacrylate. Applying a surface protective agent comprising 100 parts by weight of a modified unsaturated polyester resin obtained by polymerization, 10 to 35 parts by weight of a crosslinkable monomer, and 10 to 50 parts by weight of a natural stone powder composed of three mixtures of sericite, s Korea, and ocher
Eco-friendly repair protection method of the cross section of the concrete structure comprising a.
The method of claim 1, wherein the shrinkage reducing agent of (2) is an environmentally-friendly repair and protection method of the cross section of the concrete structure, characterized in that the calcium sulfoaluminate and gypsum are used in a ratio of 4-9: 1-6.
The method of claim 1, wherein the polymer resin of (2) is ethylene vinyl acetate (Ethylene Vinyl Acetate, EVA), NR (Natural Rubber), NBR (Natural Rubber-Butadien Rubber), SBR (Styrene-Butadien Rubber) And a polyvinyl acetate-based resin, any one or a mixture of two or more selected from the group consisting of cellulose fibers, polypropylene fibers, and polyethylene fibers, wherein the environmentally friendly repair of the concrete structure cross section is used. Protection method.
The method of claim 1, wherein the alkali activator of (2) is an environmentally friendly repair protection method of the cross section of the concrete structure, characterized in that using sodium carbonate or sodium hydrogen carbonate.
The method of claim 1, wherein the binder of (2) is an environmentally friendly repair method of the cross section of the concrete structure, characterized in that it further comprises 0.1 to 3% by weight of a water-insoluble agent.
The concrete structure according to claim 5, wherein the water-insoluble agent is selected from methyl cellulose, hygioxymethyl cellulose, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, carboxyethyl cellulose and hydroxypropyl cellulose. Eco-friendly repair protection method of section.
The method of claim 1, wherein the polybasic acid of (3) is an environment-friendly repair and protection method for cross section of a concrete structure, characterized in that a mixture of unsaturated polybasic acid and saturated polybasic acid is used.
The dipentaerythritol polyacrylate of (3) is selected from dipentaerythritol pentaacrylate, dipentaerythritol diacrylate and dipentaerythritol hexaacrylate. Eco-friendly repair and protection method for cross section of concrete structure.
The method of claim 1, wherein the crosslinkable monomer of (3) is styrene, acroronitrile, acrylimide, diacetone acrylimide, methyl acrylate, butyl methacrylate, lauryl methacrylate, acrylic acid, methyl methacrylate Acrylate, ethyl acrylate, butyl acrylate, ethyl methacrylate, glycidyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, trimethylolpropanetriacrylate, and hydroxypropyl Eco-friendly repair protection method of the cross section of the concrete structure, characterized in that one or two or more selected from acrylates.