KR102218825B1 - Mortar composition of scattering dust reduction type with improved workability, condensation speed, durability and mechanical property for repairment and reinforcement and method of repairing and reinforcing structure using the same - Google Patents

Abstract

The present invention relates to a scattered dust reduction type mortar composition for repair and reinforcement with excellent workability, improved condensation speed, and excellent durability and physical properties, and a method for repairing and reinforcing a structure using the same and, more specifically, to a mortar composition for repairing and reinforcing a structure and a method for repairing and reinforcing a concrete structure using the same, wherein the mortar composition for repairing and reinforcing a structure suppresses scattering of light materials so that workability such as health of a worker and a working environment can be improved while a property of an addictive can be fully implemented, improves the condensation speed to be effective for early strength improvement, has strong resistance to salt damage, neutralization, or chemical conditions, and has excellent durability and physical properties.

Description

(Mortar composition of scattering dust reduction type with improved workability, condensation speed, durability and mechanical) and structural repair and reinforcement mortar composition with excellent workability, improved condensation speed and excellent durability and physical properties. property for repairment and reinforcement and method of repairing and reinforcing structure using the same}

The present invention relates to a scattering dust reduction type repair and reinforcement mortar composition having excellent workability, improved setting speed, and excellent durability and physical properties, and a structural repair and reinforcement method using the same, and specifically, to an additive by suppressing scattering of lightweight materials. It is effective in improving the early strength by improving the condensation speed, improving the workability such as the health of the worker and working environment while ensuring that the characteristics of the product are fully exhibited, and has strong resistance to salt damage, neutralization, and chemical conditions, and has durability and physical properties. It relates to an excellent structural repair and reinforcement mortar composition and a method of repairing and reinforcing concrete structures using the same.

After construction, reinforced concrete structures deteriorate due to salt damage, neutralization, alkali aggregate reaction, chemical corrosion, and corrosion expansion of steel due to penetration of water, resulting in deterioration in durability and usability in the long term. If the deterioration of the structure continues, there is a risk of eventually causing the structure to collapse, so it is necessary to continuously manage and repair it.

Since delamination of the surface of the structure or the occurrence of initial defects or cracks facilitates the movement of deterioration factors and promotes the progress of deterioration, in order to secure the stability and performance of the reinforced concrete structure, repair and reinforcement is carried out at the beginning of deterioration to prevent further deterioration. It is necessary to suppress and improve the durability performance.

Therefore, after removing the concrete part containing deterioration factors such as peeling or dropping of the structure section due to deterioration of concrete, corrosion of steel, or other causes, fill or spray the section repair material to restore the section to its original performance and shape. It is common to perform repairs through construction.

Conventional repair stiffeners for cross-section restoration are mainly cement-based mortar or polymer cement mortar. These conventional repair stiffeners have the purpose of suppressing the deterioration of the existing structure and improving the durability performance beyond the present. Since most of them focus only on improving the adhesion performance during construction, the surface is easily damaged again soon after construction, so there is a problem that frequent repair and reinforcement work is required.

For example, Korean Patent Application Publication No. 2006-0079447 proposes a method of preparing a mortar composition by adding calcium sulfoaluminate (CSA) and a predetermined high-fine powder binder. However, since the mortar composition prepared using the above material uses expensive Hayne-based cement, it induces an increase in the construction cost and did not obtain sufficient results in terms of initial setting time and strength.

In addition, in the case of construction using the existing repair and reinforcement method, since moisture and oxygen permeate into the fine gaps from the surface, the corrosion of the reinforcing bar by oxygen proceeds, and the deterioration of the concrete by moisture occurs, making it difficult to sustain the repair and reinforcement effect for a long time. Therefore, there was a problem that the repair and reinforcement work had to be performed frequently.

As a related technology, Korean Patent Registration No. 10-0582840 provides a high toughness and high fire resistance mortar composition by mixing polymer cement mortar, short fibers, fireproof powder and water at a certain ratio, thereby improving the durability performance of construction and civil structures. It proposes a high toughness, high fire resistance mixed mortar composition capable of simultaneously improving fire resistance performance such as heat shielding property by fire and explosive heat resistance.

In addition, Republic of Korea Patent No. 10-0659458 is a mixture of polypropylene powder, glass beads, resin beads, etc. in dry mortar consisting of admixtures composed of cement, blast furnace slag powder, limestone fine powder, fine aggregates, expanding agent, and shrinkage reducing agent. We propose a technology to exhibit fireproof heat shielding performance by self-filling by injecting and hardening a fireproof filled mortar prepared by mixing a heat absorbing material, organic fiber, water reducing agent, and blending water into the space formed between the surface of the concrete member and the finished panel.

In addition, Korean Patent Registration No. 10-1117634 discloses a binder containing cement, slag, and an expanding agent, and an inorganic salt-based additive containing silica fine powder, silicide, potassium sulfate, EVA resin, an auxiliary agent containing PP resin, and a melamine-based fluidizing agent. As a refractory mortar composition comprising an admixture including a thickener and an aggregate, it is possible to exhibit stable fire resistance performance by adding the inorganic salt-based additive, has excellent compressive strength and durability, and proposes a technology that improves resistance to high temperatures. do.

In addition, Korean Patent Registration No. 10-1016156 treats a fire-resistant mortar composed of a binder, fiber, melamine-based fluidizing agent, and aggregate on the surface of a concrete structure, but increases the amount of fiber added to give excellent strength and improve fire resistance and heat insulation. We propose a technology about the fireproofing method of concrete structures.

As described above, most of the conventional technologies claim to have an effect of improving insulation performance and durability by adjusting the ratio of some of the concrete compositions or adding materials, but it is understood that the degree of improvement is not large.

On the other hand, for maintenance and reinforcement of sewer structures subjected to chemical erosion due to sulfuric acid, structures in a salt-damaged environment, various polluted facilities, and general concrete structures, it is necessary to carry out repair work using mortar, which is endowed with chemical resistance, especially acid resistance. There is a need.

In the case of polymer mortar, which is a major constituent material of portland cement or polymer, which is currently commonly used, there is a problem that it is poor in an environment where chemical corrosion occurs strongly despite its excellent physical properties.

In the case of studies on most of the conventional mortar compositions for repair, durability and physical performance are insufficient, and in particular, research and development for technologies for increasing chemical resistance and fire resistance improvement in poor environments have been sluggish.

In addition, the maintenance mortar is often bagged. In this case, the scattering of lightweight materials such as cement powder or various powdery additives can deteriorate the health and working environment of workers, and in the case of additives added in small amounts, its performance There is a limitation in that this is not sufficiently exerted, so improvement is necessary.

The present invention has been developed to overcome the problems and limitations of the prior art as described above, and can be simply constructed on the surface or cross section of a concrete structure by repair construction, so that it has excellent adhesion and durability, as well as scattering of lightweight materials. By suppressing the properties of additives to be fully exhibited, workability such as the health and working environment of workers is improved, and it is effective for early strength improvement by improving the condensation rate, and excellent fire resistance and chemical resistance are used for repair and construction in poor environments. It is intended to provide a mortar composition for repair and reinforcement that is suitable and has little rebound and has excellent physical properties such as compressive strength and flexural strength, and a technique for repairing and reinforcing concrete structures by applying it.

In order to achieve the above object, the present invention

(1) chipping the cross section of the concrete structure that needs to be repaired to trim until an undamaged part comes out;

(2) applying a primer to the finished concrete cross section; And

(3) 50 to 250 parts by weight of silica sand, 0.1 to 8 parts by weight of silica fume, 1 to 10 parts by weight of polymer, 0.5 to 5.0 parts by weight of reinforcing fibers based on 100 parts by weight of cement on the surface of the cross section to which the primer is applied; 1 to 10 parts by weight of magnesium alumina sulfite or calcium alumina sulfite; 0.1 to 5.0 parts by weight of calcium aluminate; 1 to 10 parts by weight of anhydrite; 0.5 to 2.0 parts by weight of a shrinkage reducing agent; 0.1 to 1.0 parts by weight of antifoam; 0.1 to 10 parts by weight of oil-coated cellulose fibers; 0.01 to 5.0 parts by weight of a metal salt thickener; 0.1 to 0.5 parts by weight of a water reducing agent; And 1 to 5 parts by weight of a porous aggregate processed by processing the glass powder; applying a mortar composition for repairing a cross section of a concrete structure including;

It provides a repair and reinforcement method of the section of the concrete structure comprising a.

In one embodiment of the present invention, the cement is characterized in that it is one or two or more mixed cements selected from portland cement, slag cement, alumina cement, and ultrafast cement.

In addition, in an embodiment of the present invention, the polymer in (3) is ethylene vinyl acetate (EVA) based, NR (Natural Rubber) based, NBR (Natural Rubber-Butadien Rubber) based, SBR ( It is characterized in that any one or a mixture of two or more selected from Styrene-Butadien Rubber)-based and polyvinyl acetate-based resins is used.

In addition, in an embodiment of the present invention, the silica sand is characterized in that it contains 90 to 99% by weight of particles having a particle size of 0.3 to 3.0 mm and a Mohs hardness of 6.0 to 10.0.

In addition, in an embodiment of the present invention, the reinforcing fiber is one or two or more selected from glass fiber, steel fiber, polyester fiber, nylon fiber, polypropylene (PP) fiber, cellulose fiber, and polyethylene fiber. To do.

In addition, in an embodiment of the present invention, the oil-coated cellulose-based fiber is coated by spraying an alkane-based mineral oil having 20 to 40 carbon atoms on the surface of the cellulose fiber, and then cut to have a length of 2 to 10 mm. It features.

In addition, in an embodiment of the present invention, the metal salt-based thickener is characterized in that calcium formate is used.

In addition, in one embodiment of the present invention, the porous aggregate processed with the glass powder is characterized in that it is obtained by applying a water-soluble resin to the pulverized glass powder by spraying, kneading, and firing in a kiln.

In this case, the water-soluble resin is preferably an EVA (Ethylene vinyl acetate copolymer) resin or an acrylic resin.

In addition, in one embodiment of the present invention, the porous aggregate has a porous structure inside and a core-shell double structure consisting of a coating layer of a water-soluble resin.

In addition, in an embodiment of the present invention, after the second step, it is characterized in that it further comprises the step of installing a reinforcing material on the concrete structure to which the primer is applied.

In this case, the reinforcing material may be an elastic wire mesh, an elastic pad, or an elastic rod.

In addition, in an embodiment of the present invention, after the third step, it is characterized in that it further comprises applying a finishing coating on the surface of the constructed concrete structure cross-section repair mortar composition.

At this time, the construction of the finishing coating is by applying a water-based epoxy-based paint comprising an epoxy base material, an amine-based curing agent, and water, and a water-dispersible acrylic urethane resin, an extender pigment, and a silane on the surface to which the water-based epoxy-based paint is applied. It can be applied by applying a water-based urethane-based paint.

The concrete structure repair and reinforcement method according to the present invention has the following advantages.

First, the mortar composition according to the present invention exhibits strong properties against chemical corrosion that may be caused by sulfuric acid gas, and sintering of the mortar is accelerated to increase sintering strength and improve livestock properties.

In addition, the compactness of the hardened structure is strengthened, temperature cracking due to heat of hydration can be suppressed, and the physical strength such as the compressive strength of the repair and reinforcement surface is reinforced by using finely powdered additives included in the binder. It has the advantage of maintaining the repair and reinforcement effect for a long period of time by enhancing the adhesive strength and improving durability and water resistance.

In addition, in order to improve the workability of concrete structures, the mortar composition is composed of a multi-structure aggregate processed with glass powder, so that it is quickly constructed even when constructing tunnels, bridges, buildings, and railway structures subject to shock or vibration. Because this is possible, workability and workability are very excellent. In particular, in a site with severe vibration or in a concrete structure, physical properties such as adhesion strength and compressive strength are reinforced, so there is an advantage of improving the problems of lack of durability such as mortar detachment.

In addition, physical strength such as compressive strength, flexural strength, and tensile strength of the repair and reinforcement surface is reinforced, and the adhesion strength with the concrete surface is enhanced to improve durability and water resistance, excellent chemical resistance and water resistance, and are resistant to fusion and salt damage. It has excellent resistance to.

In addition, the mortar composition according to the present invention can suppress the scattering of lightweight materials so that the properties of the additive can be sufficiently exhibited, improve workability such as the health and work environment of the worker, and improve the coagulation rate to be effective for early strength improvement. There is an advantage.

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

As described above, the concrete structure repair and reinforcement method according to the present invention includes the following steps. In other words,

(1) chipping the cross section of the concrete structure that needs to be repaired to trim until an undamaged part comes out;

(2) applying a primer to the finished concrete cross section; And

(3) 50 to 250 parts by weight of silica sand, 0.1 to 8 parts by weight of silica fume, 1 to 10 parts by weight of polymer, 0.5 to 5.0 parts by weight of reinforcing fibers based on 100 parts by weight of cement on the surface of the cross section to which the primer is applied; 1 to 10 parts by weight of magnesium alumina sulfite or calcium alumina sulfite; 0.1 to 5.0 parts by weight of calcium aluminate; 1 to 10 parts by weight of anhydrite; 0.5 to 2.0 parts by weight of a shrinkage reducing agent; 0.1 to 1.0 parts by weight of antifoam; 0.1 to 10 parts by weight of oil-coated cellulose fibers; 0.01 to 5.0 parts by weight of a metal salt thickener; 0.1 to 0.5 parts by weight of a water reducing agent; And 1 to 5 parts by weight of a porous aggregate processed by processing the glass powder; applying a mortar composition for repairing a section of a concrete structure including; Consists of including.

Hereinafter, each step will be described in detail.

1. Cross section chipping of concrete structures

In concrete structures, cracks occur in the concrete due to deterioration, and as time passes, the compressive strength of the concrete and the tensile strength of the reinforcing bar gradually decrease, and the exposed concrete undergoes a neutralization phenomenon, causing corrosion of the reinforcing bar. If such a phenomenon occurs through safety diagnosis and inspection, the life of the building can be maintained for a long time only by repairing the section of the concrete structure.

As a result of the safety diagnosis and inspection, the chipping step removes cracked concrete and exposed reinforcement from concrete structures that need repair as a result of safety diagnosis and inspection, and crushes and trims the section using a machine such as a crusher or water jet until undegraded concrete comes out. It's a process. At this time, it is preferable that the outermost surface of the finished concrete has a rough surface to facilitate the adhesion of the mortar.

2. Primer application

A primer is applied to the trimmed concrete section.

The primer used in the present invention is used to improve the water resistance and durability of the structure, as well as to strengthen the bonding force with the surface of the mortar to be formed later.

The primer used in the present invention may be composed of components including cement, admixture, liquid sodium silicate, liquid polysilane, and water.

Specifically, the primer used in the present invention includes 10 to 30 parts by weight of cement, 5 to 20 parts by weight of admixture, 15 to 45 parts by weight of liquid sodium silicate, 5 to 20 parts by weight of liquid polysilane, and 55 to 80 parts by weight of water. Is composed.

The cement and admixture play a role in penetrating the damaged part of the structure due to the external environment, reinforcing the structure from harmful substances and increasing the service life.

In the present invention, the admixture is preferably a mixture of fine slag powder and fly ash in a ratio of about 10:1-5.

The liquid sodium silicate is obtained by dissolving water-soluble sodium silicate in water, and a mixing ratio of water: sodium silicate may be mixed and dissolved in a weight ratio of about 100:20 to 100.

The liquid polysilane is obtained by polymerization after mixing a silane monomer in an organic solvent. More specifically, after mixing at least one silane monomer selected from dichloromethylphenylsilane, dichlorodimethylsilane, dichlorodiphenylsilane, dichlorohexylmethylsilane, and dichlorovinylmethylsilane in an organic solvent, a metal catalyst is dispersed and polymerization is performed. After filtering the polymer to separate the silicone polymer, it may be used again obtained by dissolving in an organic solvent.

The primer obtained by the above composition can strengthen the adhesive bonding force with the mortar to be applied later by tightly filling and expanding the voids on the surface of the structure, and can improve physical properties such as water resistance and durability.

In addition, in the present invention, a rubber latex primer may be used as the primer.

The rubber latex primer may be a latex primer such as styrene-butadiene latex, polyacrylic ester, acrylic and ethylene vinyl acetate, and the solid content is preferably maintained at about 10% by weight.

In addition, as the primer in the present invention, a penetration waterproof primer may be used, for example, an amine-based primer such as carboxylamine may be used.

Subsequently, optionally, a reinforcing material may be installed on the concrete structure on which the primer is applied.

The reinforcing material is a process of cutting the reinforcing bar and inserting a reinforcing material such as new reinforcing bars, carbon bars, and rods, and installing them using anchor clips, etc., when the degree of corrosion is very severe and the structural function as reinforcing bars is lost. An elastic wire mesh, an elastic pad, and an elastic bar are preferable.

Then, the primer is applied and cured, and the following mortar composition is sprayed and applied using a mechanical spraying device in a state where there is no tack on the surface (or the reinforcing material is installed).

3. Mortar composition application

The concrete cross section is chipped to remove concrete and corrosion reinforcement at the deteriorated area, and after applying a primer, a mortar composition is applied to repair.

The mortar composition used in the present invention uses the following composition in order to secure fast hardening and adhesion strength with a concrete structure.

That is, 50 to 250 parts by weight of silica sand, 0.1 to 8 parts by weight of silica fume, 1 to 10 parts by weight of polymer, 0.5 to 5.0 parts by weight of reinforcing fibers based on 100 parts by weight of cement; 1 to 10 parts by weight of magnesium alumina sulfite or calcium alumina sulfite; 0.1 to 5.0 parts by weight of calcium aluminate; 1 to 10 parts by weight of anhydrite; 0.5 to 2.0 parts by weight of a shrinkage reducing agent; 0.1 to 1.0 parts by weight of antifoam; 0.1 to 10 parts by weight of oil-coated cellulose fibers; 0.01 to 5.0 parts by weight of a metal salt thickener; 0.1 to 0.5 parts by weight of a water reducing agent; And 1 to 5 parts by weight of a porous aggregate processed by processing the glass powder.

In the present invention, the cement may be Portland cement, slag cement, alumina cement, fast-hardening cement, and the like, preferably Portland cement, and specifically, in the case of Portland cement, the main components are C ₃ S 51%, C ₂ S It is preferably about 25%, C ₃ A 9%, C ₄ AF 9%, and CaSO ₄ 4%, and a specific surface area of about 3,300 cm ² /g.

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

The blast furnace quenching slag fine powder is an amorphous latent hydraulic material, and is mainly used as an admixture material for concrete, and its advantages include suppression of temperature rise due to heat of hydration, suppression of alkali silica reaction, and improvement of chemical resistance to sulfate or seawater. As can be expected, the neutralization resistance is weak. On the other hand, the blast furnace slow cooling slag fine powder is slow-cooled and crystallized and has no hydraulicity, and a filler having no hydraulicity can exhibit a neutralization inhibitory effect. _{In addition, if a material that reacts with CO 2} gas causing neutralization is applied rather than a simple filler, the surface of the cured body is further densified by carbonation reaction, so that it is possible to suppress the penetration of the _{CO 2 gas into the inside of the cured body thereafter.} As the main component of the blast furnace slow cooling slag, the merilite does not hydrate, but exhibits a 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 function of making use of the advantages of the blast furnace quenched slag fine powder by mixing hydraulic blast furnace quenched slag fine powder and non-hydraulic blast furnace slow cooling slag fine powder, and supplementing the weak part of neutralization with blast furnace slow cooling slag fine powder, a non-hydraulic material can do.

The alumina cement is a cement having a relatively high alumina content compared to ordinary Portland cement, has excellent chemical resistance, has the advantage of being able to be used in an acidic atmosphere, and is a kind of crude steel cement that has a short curing time. use.

When mixed cement is used, 40 to 70% by weight of Portland cement, 20 to 40% by weight of slag cement, 5 to 25% by weight of alumina cement, and the remaining amount of fast-setting cement may be included.

In the present invention, the silica sand contains 90 to 99% by weight of particles having a particle size of 0.3 to 3.0 mm, and Mohs Hardness is 6.0 or more, preferably 6.0 to 10.0.

In the present invention, the silica fume is an amorphous activated silica as particles having an average particle diameter of about 0.1 to 0.5 mm, and is an amorphous activated silica, and has a super pozzolanic property by reacting with calcium hydroxide and changing to hydrated calcium silicate at room temperature.

In the present invention, the reason for adding the silica fume to the mortar composition is to improve the dispersibility and water-reduction effect due to the ball bearing effect due to the spherical particles, and improve water tightness and strength by the filling effect of silica fume between the cement particles, and This is because there are effects such as reduction of ground amount, suppression of alkali silica reaction, and improvement of chemical resistance by improving adhesion.

In the present invention, the polymer serves to improve the physical properties of the mortar by increasing the compatibility and adhesion between the mortar components, and polyvinyl acetate, polyvinyl acetate silane terminated polymer, polyvinyl alcohol, polyvinyl ester silane terminated polymer , Methyl methacrylate-butyl acrylate and styrene-butadiene rubber latex may be used, and preferably, polyvinyl acetate, polyvinyl alcohol, methyl methacrylate-butyl acrylate and styrene-butadiene rubber latex. More than one type can be used. In the present invention, the amount of the polymer is preferably used in the range of 1 to 10 parts by weight based on 100 parts by weight of the cement.

In the present invention, the reinforcing fiber is effective for initial construction stability after mortar construction and is used for the purpose of improving initial dispersibility because it can improve flexural strength and tensile strength as well as reduce surface cracks (crack) during curing. In the present invention, the reinforcing fiber is preferably a fiber having a certain degree of hydrophilicity, for example, selected from glass fiber, steel fiber, polyester fiber, nylon fiber, polypropylene (PP) fiber, cellulose fiber and polyethylene fiber It is preferable to use one or more of which are, but are not limited thereto.

In the present invention, when the magnesium alumina sulfite or calcium alumina sulfite is mixed with water and hydrated, a phenomenon of compensating the contraction of concrete occurs, thereby preventing cracking of the mortar and enhancing the structure.

In the present invention, the calcium aluminate contributes to the initial strength by promoting reactivity even at low temperatures.

In the present invention, the anhydrous gypsum serves to improve the initial adhesion of the mortar composition to enhance the adhesion strength to the base material.

In the present invention, the shrinkage reducing agent preferably has a molecular weight of 100 or more and has two or more hydroxyl groups, and for example, neopentyl glycol may be used. The neopentyl glycol has two symmetrical alcohol groups and two methyl groups at the alpha carbon position, showing excellent reactivity in the esterification reaction. In the present invention, the neopentyl glycol may be used in the form of a flake made of 100% white crystals or a slurry made of 90% neopentyl glycol and 10% water.

In the present invention, the antifoaming agent is a component used to improve the strength and appearance of the mortar by removing macropores in the mortar. In general, an oily substance having low volatility and high diffusion power or a water-soluble surfactant is used, for example, kerosene Mineral oil-based antifoaming agents such as liquid paraffin; Oil and fat antifoaming agents such as animal and vegetable oil, sesame oil, castor oil and alkylene oxide adducts thereof; Fatty acid-based antifoaming agents such as oleic acid, stearic acid, and alkylene oxide adducts thereof; Fatty acid ester antifoaming agents such as glycerin monoricinolate, alkenyl succinic acid fluid, sorbitol monoraulate, sorbitol trioleate, and natural wax; Polyoxyalkylenes, (poly)oxyalkyl ethers, acetylene ethers, (poly)oxyalkylene fatty acid esters, (poly)oxyalkylene sorbitan fatty acid esters, (poly)oxyalkylenealkyl (aryl) ethers Oxyalkylene antifoaming agents such as sulfate ester salts, (poly) oxyalkylene alkyl phosphate esters, (poly) oxyalkylene alkyl amines, and (poly) oxyalkylene amides; Alcohol-based antifoaming agents such as octyl alcohol, hexadecyl alcohol, acetylene alcohol, and glycols; Amide antifoaming agents such as acrylate polyamine; Phosphate ester antifoaming 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 dimethyl silicone oil, silicone paste, silicone emulsion, organically modified polysiloxane (polyorganosiloxane such as dimethylpolysiloxane), fluorosilicone oil, and the like can be used. In the present invention, the re-emulsified powder resin has adhesiveness for integration with the concrete structure, prevention of penetration of water and harmful substances by filling voids, and wear resistance, resistance to bending and impact, and viscosity to prevent material separation. As to play a role, EVA (Ethylene vinyl acetate), SBR (Styrene butadienerubber), or acrylic type may be used, and it is preferable to be included in the range of about 1 to 10 parts by weight of the composition.

In the present invention, the oil-coated cellulose fiber prevents scattering of lightweight materials such as cement and various additives so that the effect of the additive is properly exhibited, and serves to improve the working environment including the health of the worker. In the present invention, the oil-coated cellulose fiber is coated by spraying an alkane-based mineral oil (eg, paraffin oil) having 20 to 40 carbon atoms on the surface of the cellulose fiber, and then cut to have a length of 2 to 10 mm. It is desirable to do.

In the present invention, the oil-coated cellulose fiber is preferably included in the range of about 0.1 to 10 parts by weight in the total composition.

In the present invention, the metal salt-based thickener serves to increase the setting speed to enable early strength development.

Calcium formate may be used as such a metal salt thickener, and in the present invention, the metal salt thickener is preferably included in the range of about 0.01 to 5 parts by weight in the total composition.

In the present invention, the water reducing agent serves to secure fluidity and prevent degradation of durability by reducing the water-cement ratio, and naphthalene-based, melamine-based, sulfonic acid-based, polycarboxylic acid-based water reducing agent, and the like may be used. The water reducing agent is preferably included in the range of about 0.1 to 0.5 parts by weight in the composition.

In the present invention, the porous aggregate processed with the glass powder is preferably coated on the surface of the pulverized glass powder using a water-soluble resin such as EVA (Ethylene vinyl acetate copolymer) resin or acrylic resin. The glass powder may be, for example, finely pulverized waste glass powder, and a water-soluble resin may be sprayed on the pulverized product, kneaded into a paste state, and then calcined using a kiln. At this time, the firing temperature is preferably carried out in a temperature range in which a porous structure is formed in the glass phase but the water-soluble resin on the surface is not decomposed. After such firing, a sieving process may be further performed to separate each size.

The porous aggregate obtained by processing the glass powder in this way has a porous structure inside by the firing treatment, but has a double structure of a core-shell structure coated with a water-soluble resin on the surface.

These glass powders are also lightweight because they have a shape close to a spherical shape by firing treatment, but the deterioration of physical properties such as strength and durability can be minimized, and while having a porous structure, the water absorption rate is reduced by the surface resin coating. It has the advantage of reducing the water ratio (W/C), so that workability can be improved, problems due to excess water can be improved, and fire resistance, chemical resistance, and durability are improved due to the firing treatment.

The present invention may further include one or more additives selected from 0.1 to 1.0 parts by weight of a dispersant, 0.01 to 1.0 parts by weight of a retarder, and 0.1 to 1.0 parts by weight of an alkali activator, as needed in the mortar composition obtained with the above composition. have.

The dispersant adsorbs on the surface of the mortar particles and gives a charge to the surface of the particles, causing a mutual reaction between the particles, thereby dispersing the agglomerated particles to increase the flow, thereby enhancing the strength due to the water reducing effect. As the dispersant, a conventional water reducing agent may be used, and for example, it is possible to use alone or in combination of two or more from the group consisting of lignin sulfonate, polynaphthalene sulfonate, polymelamine sulfonate, or polycarboxylate-based water reducing agent. The content of the dispersant is preferably 0.1 to 1.0 parts by weight based on 100 parts by weight of the cement.

The retarder may be added for the purpose of securing workability for a certain period by adjusting the hydration rate of the mortar. As retarding agents, boric acid and borax, borates such as sodium borate, potassium borate, gluconic acid, citric acid, tartaric acid, glucoheptonic acid, arabonic acid, malic acid or citric acid and their sodium, potassium, calcium, magnesium, ammonium, triethanolamine Oxycarboxylic acids such as inorganic salts or organic salts such as; Monosaccharides such as glucose, fructose, galactose, saccharose, xylose, abitose, lipose, and isomerized sugar, oligosaccharides such as disaccharides and trisaccharides, or oligosaccharides such as dextrin, or polysaccharides such as dextran, Sugars such as molasses containing these; Sugar alcohols such as sorbitol; Magnesium silicide; 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 their alkali metal salts, alkalis Phosphonic acids, such as earth metal salts, and derivatives thereof can be used. The content is preferably 0.01 to 1.0 parts by weight based on 100 parts by weight of the cement.

The alkali activator is a component that affects the strength development, and one or a mixture of two or more selected from alkali metal hydroxides, chlorides, sulfur oxides and carbonates may be used, and sodium carbonate and sodium hydrogen carbonate are preferably used. It is advantageous in terms of strength development. In the present invention, the alkali activator is preferably added in an amount of 0.1 to 1.0 parts by weight based on 100 parts by weight of the cement.

In addition, the mortar composition according to the present invention may further contain an underwater non-separating agent for repair and reinforcement of an underwater concrete structure. The non-separating agent in water is added to prevent decomposition by improving the viscosity of the mortar composition in water, and includes methyl cellulose, such as methyl cellulose, hydroxymethyl cellulose, and carboxymethyl cellulose; Ethyl cellulose such as ethyl cellulose, hydroxyethyl cellulose, and carboxyethyl cellulose; Cellulose-based thickeners selected from propyl-based cellulose such as hydroxypropyl cellulose can be used. If necessary, in order to further increase the viscosity in water, a water-soluble acrylic resin powder may be further added. It is preferable to use the water-soluble acrylic resin powder in an amount of 1 to 30% by weight of the weight of the non-separating agent in water.

The mortar composition obtained as described above is applied to the surface to be constructed to repair and reinforce the cross section of the concrete structure.In the case of repeated construction more than once, the surface is polished for adhesion to the target surface to finish roughly. It is preferable to construct and plaster at 5 to 15 mm for the first pouring, 20 to 50 mm for the second and third pouring, and 5 to 15 mm for the final pouring using a trowel, but the thickness depends on the thickness of the chipped concrete. you can change it.

4. Finish coating application

The mortar composition may be applied to the crushed part of the concrete, finished smoothly, and dried, and then a process of reinforcing the repaired surface from external conditions by thinly applying the surface finish coating agent according to the present invention to the surface thereof may be further included.

It is preferable to use a water-based epoxy-based paint for the finishing coating used in the present invention.

In the present invention, the water-based epoxy-based paint is used as a water-based epoxy-based paint comprising an epoxy main material, an amine-based curing agent, and water.

Specifically, the water-based epoxy-based paint is a water-based epoxy-based paint comprising an epoxy base material, an amine-based curing agent, and water, and the epoxy base material is a liquid epoxy resin 20 to 40 parts by weight, a hydroxyl group-containing polyester resin 5 to 10 parts by weight, vanadium Acid metal salt 0.2 to 2.0 parts by weight, water 10 to 30 parts by weight, dispersant 0.5 to 2.0 parts by weight, antifoaming agent 0.2 to 1.0 parts by weight, thickener 0.2 to 2.0 parts by weight, extender pigment 5 to 20 parts by weight, wetting agent 0.2 to 2.0 parts by weight The amine-based curing agent is composed of 30 to 60 parts by weight of an amine compound, 20 to 40 parts by weight of water, 0.2 to 2.0 parts by weight of an antifoaming agent, 0.2 to 3.0 parts by weight of a thickener, and the epoxy subject: amine curing agent The mixing ratio of is mixed at a weight ratio of 10:3 to 10, and water is added in an amount of 100 to 500 parts by weight based on 100 parts by weight of the mixture of the epoxy main agent and the amine-based curing agent.

First, as the epoxy main component, 20 to 40 parts by weight of a liquid epoxy resin, 5 to 10 parts by weight of a polyester resin containing a hydroxyl group, 0.2 to 2.0 parts by weight of a vanadium acid metal salt, 10 to 30 parts by weight of water, 0.5 to 2.0 parts by weight of a dispersant , 0.2 to 1.0 parts by weight of antifoam, 0.2 to 2.0 parts by weight of thickener, 5 to 20 parts by weight of extender pigment, 0.2 to 2.0 parts by weight of wetting agent.

The liquid epoxy resin may be a bisphenol A-based liquid epoxy resin, and the bisphenol A-based liquid epoxy resin serves to improve adhesion and bonding strength.

The hydroxyl group-containing polyester resin may be a polyester resin containing a hydroxyl group or a modified resin thereof, and specifically, a polycondensate of a polyhydric alcohol and a polybasic acid may be used. At this time, the polyhydric alcohol is ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, neopentyl glycol, 1,2-butanediol, 1,3-butanediol, polycarrolactone polyol, glycerin , Sorbitol, and the like, and the polybasic acid includes phthalic acid, phthalic anhydride, tetrahydrophthalic acid, tetrahydrophthalic anhydride, trimellitic acid, trimellitic anhydride, terephthalic acid, fumaric acid, itaconic acid, adipic acid, succinic acid, cyclo It may be selected and used from hexane-1,4-dicarboxylic acid and the like.

In addition, examples of the modified resin of the polyester resin containing a hydroxyl group include a urethane modified polyester resin, an epoxy modified polyester resin, an acrylic modified polyester resin, and a silicone modified polyester resin.

It is preferable to use the hydroxyl group-containing polyester resin or modified resin thereof having a number average molecular weight of 3000 to 50,000 and a glass transition temperature of 20 to 100°C.

The vanadium acid metal salt serves to improve the corrosion resistance of the paint, and is characterized in that it is made of water-soluble. As a specific example, calcium vanadate, potassium vanadate, or the like can be used.

The dispersant is used to ensure color uniformity by dispersing the extender pigment in the liquid phase when the main substance is mixed. As such a dispersant, it may be used by selecting from a nonionic type or an anionic type.

The antifoaming agent is used to form an even coating film by suppressing bubbles of the main material, and a nonionic or silicon-based antifoaming agent may be used.

The thickener is used to prevent sedimentation of the extender pigment and improve workability, and specifically, may be used by selecting from bentonite-based, urethane-based, and acrylic-based thickeners.

The extender pigment serves to improve the strength of the coating film, and improves adhesion to the overcoat due to irregularities on the surface of the coating film, thereby improving moisture resistance and water resistance. The extender pigment used in the present invention may be selected from calcium carbonate, barium sulfate, mud, talc, mica, and silica.

In the present invention, the wetting agent serves to provide hydrophilicity to the material so that the water-soluble epoxy resin coating film can be smoothly formed. Specifically, a hydroxyethyl cellulose-based wetting agent may be used.

The amine-based curing agent serves to accelerate the curing of the handmade epoxy component.

Specific components of the amine-based curing agent include 30 to 60 parts by weight of an amine compound, 20 to 40 parts by weight of water, 0.2 to 2.0 parts by weight of a defoaming agent, and 0.2 to 3.0 parts by weight of a thickener.

The amine compound may be selected from aliphatic, aromatic, and alicyclic amine compounds, and the amine equivalent is 100 to 320 g/eq, and it is preferable to use one having a room temperature viscosity of 30 to 40,000 cps.

Other components such as the antifoaming agent and the thickening agent may be the same or different from those used in the epoxy main component.

In order to form the water-based epoxy-based paint in the present invention, the mixture ratio of the epoxy main material: the amine curing agent is mixed at a weight ratio of 10:3 to 10, and water is added to 100 parts by weight of the mixture of the epoxy main material and the amine curing agent. It is preferable to use a paint obtained by post-adding in an amount of 100 to 500 parts by weight.

Then, after the water-based epoxy-based paint is cured and cured, a water-based urethane-based paint is applied to the surface to which the water-based epoxy-based paint is applied.

In the application of the water-based urethane-based paint, a water-based urethane-based paint comprising a water-dispersible acrylic urethane resin, an extender pigment, and silane is applied.

Specifically, the water-based urethane-based paint is 50 to 80 parts by weight of a water-dispersed acrylic urethane resin, 0.2 to 2.0 parts by weight of a dispersant, 0.5 to 2.0 parts by weight of a thickener, 5 to 20 parts by weight of an extender, 0.2 to 2.0 parts by weight of an antifoam, 0.2 to a silane. It is characterized in that it comprises 2.0 parts by weight and 0.2 to 5.0 parts by weight of a co-solvent.

The aqueous dispersion acrylic urethane resin is 2-hydroxyethyl methacrylate (2-HEMA: 2-hydroxyethyl methacrylate), methyl methacrylate (MMA: methyl methacrylate), n-butyl acrylate (n-BA: n-butyl acrylate) and acrylic acid (AAc: acrylic acid), and a polyurethane acrylate hybrid emulsion synthesized by adding an anionic or nonionic emulsifier and an initiator may be used. The water-dispersible acrylic urethane resin is environmentally friendly because it dries quickly and exhibits excellent weather resistance, durability, and UV stability even under external exposure conditions, and is water-soluble.

The dispersant is for forming a coating film of uniform color by evenly dispersing the extender pigment in the liquid when the water-soluble urethane-based paint is mixed. In the present invention, a nonionic type polyoxyalkylene type surfactant or an anionic type polycarboxyl salt type Any one selected from surfactants may be used.

The thickener is to prevent sedimentation of the pigment and improve workability during painting. In the present invention, any one selected from bentonite-based, urethane-based, and acrylic-based may be used.

The extender pigment is for color expression of a water-soluble urethane-based paint, and any one selected from red iron oxide, titanium dioxide, yellow iron oxide, and carbon black may be used.

The antifoaming agent is for forming an even coating film by suppressing air bubbles in the water-soluble urethane-based paint, and in the present invention, any one selected from nonionic or silicone may be used.

The silane is used to improve adhesion and to improve water resistance and durability of the coating film, and includes glycidoxypropyl methyldiethoxy silane, gamma methacryloxy propyl triethoxysilane, gammaglycidoxy propyl triethoxy silane, gammaamino Any one selected from propyl triethoxy silane and vinyl trimethoxy silane may be used.

The co-solvent is to increase the dissolving power of the solvent to facilitate the shape of the coating film, and any one selected from texanol, butyl acetate, and butyl cellosolve may be used.

The surface coating applied by the above method is excellent in bonding strength and durability with the surface of the mortar as a conductor by using the above-described eco-friendly coating composition, and excellent physical properties such as adhesion strength and compressive strength, and in particular, waterproofness, resistance to salt damage, It has excellent properties such as chemical resistance and fire resistance, so the surface reinforcement effect of concrete structures is excellent. In addition, since it is water-soluble and does not elute organic solvents or heavy metals, it is environmentally friendly, and since the life of the painting can be extended, the reinforcing effect of the structure surface can be maintained for a long time.

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

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

[Example]

(Production Example 1) Preparation of mortar composition

Portland cement 100 parts by weight, silica sand (particle size 0.3-3.0mm, hardness 6 or more) 150 parts by weight, silica fume 5.0 parts by weight, polyvinyl acetate polymer 5 parts by weight, glass fiber and steel fiber mixture 1.0 parts by weight, calcium alumina sulfite 5 parts by weight, 0.9 parts by weight of calcium aluminate, 5.0 parts by weight of anhydrite, 1.0 parts by weight of neopentyl glycol shrinkage reducing agent, 0.3 parts by weight of antifoam, 5 parts by weight of oil-coated cellulose fiber, 0.3 parts by weight of calcium formate, glass powder A mortar composition was prepared by uniformly mixing 4 parts by weight of the processed porous aggregate and 0.2 parts by weight of a water reducing agent with an appropriate amount of water. At this time, as the porous aggregate processed with the glass powder, a core-shell double structure porous aggregate obtained by finely pulverizing waste glass, spraying EVA resin, kneading it into a paste, and firing in a kiln was used.

(Production Example 2) Preparation of mortar composition

Portland cement 100 parts by weight, silica sand (particle size 0.3-3.0mm, hardness 6 or more) 150 parts by weight, silica fume 5.0 parts by weight, polyvinyl acetate polymer 5 parts by weight, glass fiber and steel fiber mixture 1.0 parts by weight, magnesium alumina sulfite 4 parts by weight, calcium aluminate 0.8 parts by weight, anhydrous gypsum 5.0 parts by weight, neopentyl glycol shrinkage reducing agent 1.0 parts by weight, antifoaming agent 0.3 parts by weight, oil coated cellulose fiber 5 parts by weight, calcium formate 0.3 parts by weight, glass powder A mortar composition was prepared by uniformly mixing 4 parts by weight of the processed porous aggregate and 0.2 parts by weight of a water reducing agent with an appropriate amount of water. At this time, as the porous aggregate processed with the glass powder, a core-shell double structure porous aggregate obtained by finely pulverizing waste glass, spraying EVA resin, kneading it into a paste, and firing in a kiln was used.

(Comparative Preparation Example 1) Preparation of mortar composition

A mortar composition was prepared by mixing 100 parts by weight of the Portland cement binder with 55 parts by weight of silica sand consisting of fine yarn having an average particle diameter of 0.1 to 1.0 mm, 9.5 parts by weight of limestone (Gyeonggi Mining) and an appropriate amount of water.

(Comparative Preparation Example 2) Preparation of mortar composition

Portland cement 100 parts by weight, blast furnace quenching slag and blast furnace slow cooling slag mixed at a weight ratio of 5:5, and 20 parts by weight of synthetic slag fine powder having an average particle diameter of 2 to 10 µm, polymer resin (EVA resin) 1.0 part by weight, cellulose fiber 1.0 parts by weight and 0.5 parts by weight of sodium hydrogen carbonate were mixed, 55 parts by weight of silica sand made of fine yarn having an average particle diameter of 0.1 to 1.0 mm, 9.5 parts by weight of limestone (Gyeonggi Mining) and an appropriate amount of water were mixed to prepare a mortar composition. .

(Comparative Preparation Example 3) Preparation of Mortar Composition

Portland cement 65 parts by weight, blast furnace quenching slag and blast furnace slow cooling slag mixed at a weight ratio of 5:5, and 20 parts by weight of synthetic slag fine powder having an average particle diameter of 2 to 10 µm, polymer resin (EVA resin) 1.0 part by weight, cellulose fiber 1.0 parts by weight and 0.5 parts by weight of sodium hydrogencarbonate, 0.5 parts by weight of an insoluble in water (methylcellulose), 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) were added and mixed. , Here, a mortar composition was prepared by mixing 55 parts by weight of silica sand, 9.5 parts by weight of limestone (Gyeonggi Mining), and an appropriate amount of water made of fine yarn having an average particle diameter of 0.1 to 1.0 mm.

[Example 1]

The surface of the damaged concrete structure was chipped, crushed, ground, cleaned, and cleaned using a high pressure washer. Thereafter, a penetration waterproof protective primer was applied to the exposed reinforcing bars, and the mortar composition prepared in Preparation Example 1 was applied in a state where the primer was cured and there was no surface tack, and then smoothly applied to the surface of the structure and dried for 4 days. The reinforcement construction was completed by curing.

[Example 2]

The surface of the damaged concrete structure was chipped, crushed, ground, cleaned, and cleaned using a high pressure washer. Thereafter, a rubber latex-based primer was applied to the exposed reinforcing bar, and the mortar composition prepared in Preparation Example 2 was applied in a state where the primer was cured and there was no surface tack, and then smoothly applied to the surface of the structure, followed by drying and curing for 4 days. The reinforcement construction was completed.

[Example 3]

The surface of the damaged concrete structure was chipped, crushed, ground, cleaned, and cleaned using a high pressure washer. Thereafter, an amine-based waterproof protection primer was applied to the exposed reinforcing bar, and the mortar composition prepared in Preparation Example 1 was applied in a state where the primer was cured and there was no surface tack, and then smoothly applied to the surface of the structure. The reinforcement construction was completed by drying and curing for a day. The surface of the dried and cured mortar was coated twice with a thickness of 100 μm, and then cured and dried to complete the reinforcement construction.

[Example 4]

The surface of the damaged concrete structure was chipped, crushed, ground, cleaned, and cleaned using a high pressure washer. Thereafter, an amine-based waterproof protective primer was applied to the exposed reinforcing bar, and the mortar composition prepared in Preparation Example 2 was applied in a state where the primer was cured and there was no surface contact, and then smoothly applied to the surface of the structure. The reinforcement construction was completed by drying and curing for a day. The surface of the dried and cured mortar was coated twice with a thickness of 100 μm, and then cured and dried to complete the reinforcement construction.

[Comparative Example 1]

It was carried out in the same manner as in Example 1, except that only the reinforcement construction of the concrete structure was performed using the mortar composition prepared in Comparative Preparation Example 1.

[Comparative Example 2]

It was carried out in the same manner as in Example 1, except that only the reinforcement construction of the concrete structure was performed using the mortar composition prepared in Comparative Production Example 2.

[Comparative Example 3]

It was carried out in the same manner as in Example 1, except that the reinforcement construction of the concrete structure was performed using the mortar composition prepared in Comparative Production Example 3.

Performance evaluation

(1) Physical properties of the mortar composition

A test specimen was prepared using the mortar prepared in Preparation Example and Comparative Preparation Example, and physical properties were measured by the following test method.

1) Absorption rate, flow, slurry density: conducted in accordance with KS L 5220

2) Flexural strength: KS F 2476「Strength test method of polymer cement mortar」

3) Compressive strength: KSF 2405

4) Adhesion strength: KS F 4716 「Strength test method of polymer cement mortar」

5) Length change rate: It was measured according to KS F 2424 mortar and concrete length change test method. As for the value, the value of the initial construction body is set to 0, and "-" represents the shrinkage rate, and "+" represents the expansion rate.

The results are shown in Table 1 below.

Item Manufacturing Example 1 Manufacturing Example 2 Comparative Production Example 1 Comparative Production Example 2 Comparative Production Example 3 Water absorption (%) 11 15 25 28 31 Flow(mm) 132 135 120 119 120 Slurry density 1.60 1.70 1.90 1.96 2.01 Flexural strength
(N/mm ² ) 7 days 9.6 10.1 6.9 6.7 6.5 28 days 12.0 12.9 8.0 8.9 8.5 Compressive strength
(N/mm ² ) 1 day 14.4 15.2 11.0 11.0 12.0 3 days 23.4 26.7 15.5 11.2 12.0 7 days 31.8 32.8 34.0 35.1 35.1 28 days 39.4 40.2 41.0 40.1 42.0 Adhesion strength
(N/mm ² ) Standard condition 3.4 3.4 1.2 1.3 1.4 After repeating warm and cooling 3.2 3.2 1.4 1.3 1.5 Length change
rate(%) 3 days 0.011 0.010 0.045 0.046 0.039 7 days 0.004 0.004 0.006 0.005 0.004 14 days -0.01 -0.01 -0.05 -0.05 -0.04 28 days -0.023 -0.023 -0.06 -0.055 -0.04

As shown in Table 1 above, in the case of the mortar composition according to the present invention, it was confirmed that physical properties such as water absorption, compressive strength, and adhesion strength were remarkably superior to those of the conventional mortar composition. It was confirmed that it is advantageous for securing early strength.

(2) Seismic performance and section recovery performance evaluation

1) Weatherability evaluation

It was measured for 400 hours 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 (crack, blister, etc.) occurs continuously in hot water at 90°C was measured.

Table 2 shows the evaluation results.

Weather resistance (white) Surface hardness Water resistance Example 1 △E0.8 6H 590hr Example 2 △E0.8 6H 580hr Example 3 △E1.1 6H 600hr Example 4 △E1.1 5H 610hr Comparative Example 1 △E3.1 3H 350hr Comparative Example 2 △E3.4 4H 340hr Comparative Example 3 △E3.2 3H 330hr

As shown in Table 2 above, when a concrete structure is repaired using the mortar composition according to the present invention and a finishing coating material is selectively applied to the surface thereof, compared to the case of using a conventional mortar composition and using a conventional coating agent, weather resistance, It can be confirmed that the surface hardness and water resistance are remarkably excellent.

From the results of Tables 1 and 2 above, the mortar composition according to the present invention has excellent physical performance of mortar, excellent adhesion to concrete, and excellent physical properties such as weather resistance and water resistance, so that the repair effect of concrete structures such as tunnels is maintained for a long time It can be confirmed that it can also be advantageous in exhibiting seismic performance.

In addition, it was confirmed with the naked eye that the mortar composition according to the present invention was significantly less than the mortar according to the comparative example in scattering dust. Therefore, when the mortar composition according to the present invention is used, it is expected that the health of the worker can be preserved and the problem due to scattering dust can be reduced even in the working environment, and it is expected that it will contribute to sufficiently exert its function even in the case of additives added in trace amounts. do.

The present invention is not limited by the specific embodiments described above, and various modifications can be implemented by anyone of ordinary skill in the art without departing from the gist of the present invention described in the claims. However, such changes are to be construed as falling within the scope of the appended claims.

Claims (15)

(1) chipping the cross section of the concrete structure in need of repair and trimming it until an undamaged part comes out;
(2) applying a primer to the finished concrete cross section; And
(3) 50 to 250 parts by weight of silica, 0.1 to 8 parts by weight of silica fume, 1 to 10 parts by weight of polymer, 0.5 to 5.0 parts by weight of reinforcing fibers, based on 100 parts by weight of cement on the surface of the cross section to which the primer is applied; 1 to 10 parts by weight of magnesium alumina sulfite or calcium alumina sulfite; 0.1 to 5.0 parts by weight of calcium aluminate; 1 to 10 parts by weight of anhydrite; 0.5 to 2.0 parts by weight of a shrinkage reducing agent; 0.1 to 1.0 parts by weight of antifoam; 0.1 to 10 parts by weight of oil-coated cellulose fibers; 0.01 to 5.0 parts by weight of a metal salt thickener; 0.1 to 0.5 parts by weight of a water reducing agent; And 1 to 5 parts by weight of a porous aggregate processed by processing the glass powder; applying a mortar composition for repairing a cross section of a concrete structure including; It characterized in that it comprises a,
The cement is one or two or more mixed cements selected from portland cement, slag cement, alumina cement, and ultrafast cement,
The polymer is ethylene vinyl acetate (EVA), NR (Natural Rubber), NBR (Natural Rubber-Butadien Rubber), SBR (Styrene-Butadien Rubber) and polyvinyl acetate (Polyvinyl Acetate) resin. It is characterized by using any one or a mixture of two or more selected from,
The silica sand is characterized in that it contains 90 to 99% by weight of particles having a particle size of 0.3 to 3.0 mm and has a Mohs hardness of 6.0 to 10.0,
The reinforcing fiber is characterized in that it is one or two or more selected from glass fiber, steel fiber, polyester fiber, nylon fiber, polypropylene (PP) fiber, cellulose fiber and polyethylene fiber,
The oil-coated cellulose fiber is characterized in that using a cut to have a length of 2 to 10 mm after coating by spraying alkane mineral oil having a carbon number of 20 to 40 on the surface of the cellulose fiber,
The metal salt-based thickener is characterized in that calcium formate is used, but is included in the range of 0.01 to 5 parts by weight in the total composition,
The porous aggregate processed with the glass powder is obtained by applying a water-soluble resin to the pulverized glass powder by spraying and kneading it and then firing it in a kiln, but the water-soluble resin is EVA (Ethylene vinyl acetate copolymer) resin or acrylic It is a resin, sprayed on a pulverized glass powder using the water-soluble resin, kneaded into a paste, and then calcined using a kiln. The firing temperature is within a temperature range that forms a porous structure in the glass phase but does not decompose the water-soluble resin on the surface A method of repairing and reinforcing the cross section of a concrete structure, characterized in that the inside has a porous structure but the surface has a core-shell structure coated with a water-soluble resin by plasticizing in
delete delete delete delete delete delete delete delete delete delete The method of claim 1, further comprising, after the second step, installing a reinforcing material on the concrete structure on which the primer has been applied.
The method of claim 12, wherein the reinforcing material is an elastic wire mesh, an elastic pad, or an elastic bar.
The method according to claim 1, further comprising applying a finishing coating on the surface of the mortar composition for repairing the section of the constructed concrete structure after the third step.
The method of claim 14,
The construction of the finish coating is applied with a water-based epoxy-based paint comprising an epoxy base material, an amine-based curing agent, and water, and a water-dispersible acrylic urethane resin, an extender pigment, and a silane are applied to the surface to which the water-based epoxy-based paint is applied. A method of repairing and reinforcing a section of a concrete structure, characterized in that it is applied by applying a water-based urethane-based paint.