KR102038266B1 - Eco-friendly mortar composition for repairing and reinforcing structures, and method of repairing and reinforcing structures using the same - Google Patents

Abstract

The present invention relates to an environmentally friendly mortar composition for repairing and reinforcing a structure, and a construction method for repairing and reinforcing a structure using the same. More specifically, the environmentally friendly construction method for repairing and reinforcing a concrete structure provided to repair the concrete structure requiring a repair on a cross section is able to: be used for a repair work of concrete under water such as sea water by having a great shielding effect of chloride ion as well as suppressing neutralization as exerting a self-defense function gradually over time after the repair work; maintain repaired and reinforced effects for long time by improving long-term durability and adhesion strength with a concrete structure; improve structural density and increase adhesion strength with concrete while increasing an economic effect by recycling resources wasted as industrial byproducts; and maximize a reinforcing effect by treating a mortar surface with a surface coating agent improving a surface reinforcing function and having a self-defense function while reinforcing adhesion strength, weather resistance and mechanical properties. The environmentally friendly repairing and reinforcing method of the present invention comprises: a step of processing the cross section of a concrete structure by chipping until an undamaged part comes out; a step of applying a mortar composition to the processed concrete section; and a step of applying a surface coating agent on the surface to which the mortar composition is applied.

Description

Eco-friendly mortar composition for repairing and reinforcing structures, and method of repairing and reinforcing structures using the same}

The present invention relates to an environmentally friendly mortar composition for structural repair reinforcement and a structural repair reinforcement method using the same. More specifically, the long-term durability and adhesion strength with the concrete structure are improved to maintain the repair reinforcement effect for a long time, and have fast diameter characteristics. Therefore, repair and reinforcement work can be completed in a short time, and it is economical, and it is possible to improve the adhesive strength, weather resistance and surface strength by coating the surface coating with self-defense function on the mortar surface. The present invention relates to an eco-friendly repair and reinforcement method for the cross section of concrete structures.

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

Delamination of the structure surface or the occurrence of initial defects or cracks facilitates the movement of deterioration factors, thereby facilitating the progress of deterioration. Therefore, in order to secure the stability and performance of the reinforced concrete structure, repair and reinforcement are performed at the initial stage of deterioration to further progress the deterioration. It is necessary to suppress and improve durability.

Therefore, after removing the concrete part containing deterioration factors such as peeling or dropping of the cross section of the structure due to deterioration of concrete, corrosion of steel, and other causes, the section recovery material is filled or sprayed to restore the cross section to its original performance and shape. It is common to perform repairs 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 the moisture and oxygen penetrate into the minute gaps on the surface, corrosion of the reinforcing bars by oxygen and deterioration of concrete caused by water are difficult to maintain the reinforcement effect 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. The long-term durability and adhesion strength with concrete structures can be improved to maintain the repair reinforcement effect for a long time. It can increase the effect, improve the structural density, increase the adhesion strength with concrete, and improve the adhesion strength, weather resistance and mechanical properties, and improve the surface reinforcement function. By processing to To maximize the effect will be to provide environmentally friendly rehabilitation method of concrete cross-section.

The present invention 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) 30 to 75% by weight of cement, blast furnace quenching slag and blast furnace slow cooling slag are included in the trimmed concrete section in a weight ratio of 7 to 9: 1 to 3, and the powder is 1,000 to 5,000 cm ² / g. 5 to 45% by weight of the mixture, 5 to 30% by weight of glass powder having a powder degree of 1,000 to 3,000 cm ² / g, 3 to 20% by weight of shrinkage reducing agent, 0.5 to 1.5% by weight of polymer resin, 0.2 to 2% by weight of fiber, 1-5 wt% silica fume, 0.5-5.0 wt% clinker, 0.5-5.0 wt% plaster, 0.5-5 wt% alpha-type hemihydrate gypsum, 0.01-5 wt% fly ash, 0.1-5 wt% red mud, calcined sol Rana comprises 0.01 to 5% by weight, 100 parts by weight of the binder consisting of 0.01 to 5% by weight of microsilica and 20 to 100 parts by weight of silica sand and water,

The synthetic slag fine powder mixture is a mechanochemically activated mixture in which the mixture of gypsum, soluble silicate, lithium ionized and silane compounds is further mixed and pulverized in a vibration mill during the fine powdering process of the blast furnace quenching slag and the blast furnace slow cooling slag. Applying a mortar composition, characterized in that; And

(3) applying a primer including cement, admixture, liquid sodium silicate, liquid polysilane, and water to the surface to which the mortar composition is applied, and comprising epoxy base, amine-based curing agent and water on the surface to which the primer is applied. Applying an aqueous epoxy-based paint, and applying a surface coating agent by applying an aqueous urethane-based paint including a water-dispersible acrylic urethane resin, a sieving pigment, and a silane to a surface on which the aqueous epoxy-based paint is applied; Provides an eco-friendly repair reinforcement method of the cross section of the concrete structure comprising a.

In one embodiment of the present invention, the polymer resin in (2) is ethylene vinyl acetate (Ethylene Vinyl Acetate, EVA), NR (Natural Rubber), NBR (Natural Rubber-Butadien Rubber), SBR (Styrene) -Any one or a mixture of two or more selected from Butadien Rubber-based and Polyvinyl Acetate-based resins, wherein the fibers are 20 to 50% by weight polypropylene fiber, 20 to 50% by weight nylon fiber and arbocel It is characterized by comprising 30 to 60% by weight of fibers.

In addition, in one embodiment of the present invention, in the above (2), the gypsum is preferably one or a mixture of two or more selected from natural gypsum, flue gas decalcification gypsum, petroleum coke desulfurization gypsum and coal coke decalcification gypsum. Do.

In addition, in one embodiment of the present invention, the soluble silicate in the above (2) is 1 selected from sodium silicate, potassium silicate, sodium silicate, colloidal silica, soluble silica, modified silicate, silica sol and water-soluble silicic acid of silica gel It is preferable that it is species or a mixture of 2 or more types.

Further, in one embodiment of the present invention, the lithium ion in (2) is lithium hydroxide, lithium oxide, lithium carbonate, lithium fluoride, lithium phosphate, lithium chloride, lithium nitrate, methyl lithium, ethyl lithium, alkyl lithium It is preferable to ionize 1 type, or 2 or more types of the ethyl lithium and the lithium silicate in the solvent.

In addition, in one embodiment of the present invention, the synthetic slag fine powder mixture in (2) is 100 parts by weight of the mixture of the blast furnace quench slag and blast furnace slow cooling slag, 0.1 to 10 parts by weight of gypsum, 0.1 to 5.0 parts by weight of soluble silicate And 0.1 to 3.0 parts by weight of ionized lithium and 0.1 to 3.0 parts by weight of the silane compound.

In addition, in one embodiment of the present invention, the polymer resin is characterized in that it comprises 20 to 50% by weight of EVA resin and 50 to 80% by weight of acrylic reemulsification resin.

At this time, the acrylic reemulsification resin is 100 to 100 parts by weight of the total monomer consisting of 80 to 90% by weight of the acrylic polymer and 10 to 20% by weight of the monomer having a crosslinkable functional group; 0.1 to 5 parts by weight of a reactive anionic emulsifier and a nonionic emulsifier; 0.01 to 1 part by weight of polymerization initiator; And it may be an acrylic emulsion polymer obtained by polymerizing a preemulsion containing 45 to 50 parts by weight of water.

In addition, the monomer having a crosslinkable functional group is methacryloxypropyltrimethoxysilane, acrylonitrile, acetoacetic ethyl methacrylate, divinylbenzene, ethylene glycol dimethacrylate, butanediol dimethacrylate, cyclohexyl It may be one or a mixture of two or more selected from methacrylate and 3-chloro-2-hydroxypropyl methacrylate.

Referring to the features and advantages of the environmentally friendly mortar composition for structure repair reinforcement and structural repair reinforcement method using the same 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. In addition, physical strength such as compressive strength, flexural strength, and tensile strength of repair reinforcement surface is strengthened, adhesion strength with concrete surface is strengthened, durability and water resistance are improved, chemical resistance and water resistance are excellent, and copper melting and It is also excellent in salt resistance.

5. In addition, the paint composition used as the surface coating agent is excellent in durability, in particular, chemical resistance, water resistance, salt resistance, etc., and also has a self-defense function, excellent surface reinforcing effect of concrete structures, organic solvents or heavy metals Since it is not eluted, it is environmentally friendly and can extend the life of the coating film, so that the reinforcing effect of the concrete surface can be maintained for a long time.

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 concrete structure repair reinforcing method according to the present invention comprises the following steps. In other words,

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

(2) 30 to 75% by weight of cement, blast furnace quenching slag and blast furnace slow cooling slag are included in the trimmed concrete section in a weight ratio of 7 to 9: 1 to 3, and the powder is 1,000 to 5,000 cm ² / g. 5 to 45% by weight of the mixture, 5 to 30% by weight of glass powder having a powder degree of 1,000 to 3,000 cm ² / g, 3 to 20% by weight of shrinkage reducing agent, 0.5 to 1.5% by weight of polymer resin, 0.2 to 2% by weight of fiber, 1-5 wt% silica fume, 0.5-5.0 wt% clinker, 0.5-5.0 wt% plaster, 0.5-5 wt% alpha-type hemihydrate gypsum, 0.01-5 wt% fly ash, 0.1-5 wt% red mud, calcined sol Rana comprises 0.01 to 5% by weight, 100 parts by weight of the binder consisting of 0.01 to 5% by weight of microsilica and 20 to 100 parts by weight of silica sand and water,

The synthetic slag fine powder mixture is a mechanochemically activated mixture in which the mixture of gypsum, soluble silicate, lithium ionized and silane compounds is further mixed and pulverized in a vibration mill during the fine powdering process of the blast furnace quenching slag and the blast furnace slow cooling slag. Applying a mortar composition, characterized in that; And

(3) applying a primer including cement, admixture, liquid sodium silicate, liquid polysilane, and water to the surface to which the mortar composition is applied, and comprising epoxy base, amine-based curing agent and water on the surface to which the primer is applied. Applying an aqueous epoxy-based paint, and applying a surface coating agent by applying an aqueous urethane-based paint including a water-dispersible acrylic urethane resin, a sieving pigment, and a silane to a surface on which the aqueous epoxy-based paint is applied; It is configured to include.

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

1. Chipping of Concrete Structure Sections

When concrete cracks occur in concrete structures due to deterioration, the compressive strength of the concrete and the tensile strength of the reinforcing bars are gradually decreased, and the concrete exposed to the cracking site is neutralized, causing corrosion of the steel. 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. At this time, the outermost surface of the trimmed concrete is preferably to have a rough surface 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, 30 to 75% by weight of cement, blast furnace quenching slag and blast furnace slow cooling slag are included in the weight ratio of 7 to 9: 1 to 3, 5 to 45% by weight of the synthetic slag fine powder mixture of 1,000 to 5,000 cm ² / g powder, 5-30% by weight of glass powder having a degree of powder 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, 1-5% by weight of silica fume , Clinker 0.5 to 5.0% by weight, plaster 0.5 to 5.0% by weight, alpha-type hemihydrate gypsum 0.5 to 5%, fly ash 0.01 to 5% by weight, red mud 0.1 to 5% by weight, calcined fossolola 0.01 to 5% by weight, 100 parts by weight of the binder consisting of 0.01 to 5% by weight of microsilica and 20 to 100 parts by weight of silica sand and water are used. In this case, the synthetic slag fine powder mixture is treated with mechanochemical activation for mixing and grinding a mixture of gypsum, soluble silicate, ionized lithium and silane compound in a vibration mill during the fine powdering process of the blast furnace quenching slag and the blast furnace slow cooling slag. It is characterized by a mixture.

In the present invention, the cement may be used, such as portland cement, slag cement, alumina cement, fast-hard cement, preferably portland cement, specifically, in the case of portland cement, the main components are C ₃ S 51%, C ₂ S It is preferable to use about 25%, C ₃ A 9%, C ₄ AF 9%, CaSO ₄ 4%, and a specific surface area of 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 can 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, by mixing hydrophobic quenching slag fine powder and non-hydrosetting blast furnace slow cooling slag fine powder to take advantage of blast furnace quenching slag fine powder, the part which is vulnerable to neutralization is complemented by blast furnace slow cooling slag fine powder which is a non-hydrophobic material. can do.

In forming the 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 performance to obtain, if it exceeds 45% by weight it takes a long time to obtain the required strength, and there is a difficulty in expressing the appropriate physical performance. In addition, the synthetic slag fine powder in the present invention is used to prepare a powder of 1,000 ~ 5,000 cm ² / g.

The manufacturing process of the synthetic slag fine powder is prepared by the mechanochemical activation process of mixing and grinding a mixture of blast furnace quenching slag and blast furnace slow cooling slag further mixed with gypsum, soluble silicate, ionized lithium and silane compound in a vibration mill. .

Specifically, the synthetic slag fine powder mixture is 100 parts by weight of the mixture of the blast furnace quench slag and blast furnace slow cooling slag, 0.1 to 10 parts by weight of gypsum, 0.1 to 5.0 parts by weight of soluble silicate, 0.1 to 3.0 parts by weight of ionized lithium and 0.1 to 3.0 of silane compound It is prepared by mixing the parts by weight mechanochemical activation.

In the present invention, the gypsum breaks down the acidic film of the fine slag powder, accelerates the release of ions from the inside of the slag, and reacts with them to generate a large amount of ethrinzite at the beginning of hydration, and generates calcium silicate hydrate as the age passes. It plays a role in expressing harm intensity.

In the present invention, the gypsum may be used one or a mixture of two or more selected from natural gypsum, flue gas decalcification gypsum, petroleum coke desulfurization gypsum and coal coke decalcification gypsum.

In the present invention, the soluble silicate may be used one, or a mixture of two or more selected from sodium silicate, potassium silicate, sodium silicate, colloidal silica, soluble silica, modified silicate, silica sol and water-soluble silicic acid of silica gel.

In the present invention, the ionized lithium is one or two of lithium hydroxide, lithium oxide, lithium carbonate, lithium fluoride, lithium phosphate, lithium chloride, lithium nitrate, methyllithium, ethyllithium, alkyllithium, ethyllithium and lithium silicate What ionized more than 1 type in the solvent can be used.

In the present invention, the silane may be a second alkylalkoxysilane or a third siloxane compound having a first alkylalkoxysilane, acryloyloxyalkyl group, or methacryloyloxyalkyl group.

In the present invention, the soluble silicate, ionized lithium and silane allow the content of silicon oxide in the slag fine powder to be increased, thereby enabling the secondary reaction to be further activated, thereby reducing the loss in ignition, resistance to salt resistance, improving strength, and heat of hydration. It plays a role in making dynamic performance such as reduction.

In the present invention, the mechanochemical activation treatment may be performed by mixing and grinding for 5 to 60 minutes, more preferably 10 to 30 minutes in a vibration mill.

In the present invention, the mechanochemical activation treatment is to change the bonding state of the material by a mechanical grinding process to change the physical and chemical properties of the material. There is an advantage to proceed at the same time. In other words, mechanical impingement in the grinding system by mechanochemical activation treatment leads to the development of elasticity, plasticity and shear deformation, resulting in the destruction of particles, amorphous and even chemical reactions in the solid state.

In general, grinding in the cement field generally uses a fine grinding machine such as a ball mill or a roller mill. In the case of a ball mill, the grinding medium is moved upwards along the inner wall of the cylinder by centrifugal force and then falls to the ground as the centrifugal force impacts the pulverized product. The roller mill is a method of pulverizing by applying the roller mill, which rotates the three to four rollers on the disc at the same time and revolves the whole to use the principle that the pulverized product is crushed by the compression and friction force between the roller, the disc and the inner wall. In contrast, a vibratory mill is a pulverized product that is pulverized in a short time by pulsating the whole mill by the eccentric circle, while the grinding media such as balls and bars in the mill deliver impact and frictional forces to the mill at the same time. It is a device that can change the properties of grinding raw materials physicochemically by supplying a large amount of grinding energy. In other words, the vibration mill is a grinding system suitable for the mechanochemical activation process, which enables the grinding of the target fine powder in a shorter time than the grinding media such as the conventional ball mill. When pulverized, the fine particles of the preparation are surface treated, resulting in increased chemical activity as the affinity between the particles increases.

In the present invention, the mechanochemical treatment is preferably performed in a vibration mill for 5 minutes to 60 minutes, more preferably 10 minutes to 30 minutes. This is because it is a preferred time to treat the specific surface area of the mixture of the present invention at 1,000 to 5,000 cm ² / g.

The present invention is a glass powder, shrinkage reducing agent, polymer resin, fiber, silica fume, clinker, plaster, alpha-type hemihydrate gypsum, fly ash, red mud, calcined slag formed in the slag mixture formed by the mechanochemical activation treatment, Microsilica is mixed to form a binder, and 100 parts by weight of the binder, 20-100 parts by weight of silica sand, and water are mixed to form a mortar composition.

In the present invention, the glass powder is composed of more than 70% of the chemical composition of the silica (SiO ₂ ) component having a latent hydraulic properties, and the pozzolanic action is activated during the hydration reaction with cement to make excellent bonding with the concrete structure It increases strength and contributes to improved 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 30% 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-section reinforcement of the concrete structure, and in the state after curing, surface adhesion, increase cohesion, increase flexural strength, and flexural properties. 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 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 hindrance shows the disadvantage that the strength is hindered by the generation of the hydration product.

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 fiber which can be used in the present invention, it is preferable to use 20-50% by weight of polypropylene fiber, 20-50% by weight of nylon fiber and 30-60% by weight of arbocell fiber. The arbocell fibers, more specifically, natural arbocel fibers, act as hydrophilic fibers to prevent surface cracks and to enhance strength, maximizing the advantages of each fiber when used in combination with polypropylene fibers and nylon fibers. By exerting the effect, it is possible to increase the strength and reduce the rebound amount. 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 the present invention, the silica fume (Silica fume) is a near spherical particle composed of an average particle diameter of about 0.1 ~ 0.5 mm is amorphous active silica, and reacts with calcium hydroxide as shown in the following chemical formula to change to hydrous calcium silicate at room temperature Pozzolanic.

3CaOSiO ₂ + H ₂ O → CSH (cement gel) + Ca (OH) ₂

The reason for adding the silica fume in the binder in the present invention is that the ball bearing effect by the spherical particles to improve the dispersibility and water resistance, and the silica fume filling effect between the cement particles to improve the watertightness and high strength, and the adhesion of shotcrete This is because the improved properties have the effect of reducing the ground amount, suppressing alkali silica reaction and improving chemical resistance.

In addition, in the present invention, the clinker (clinker) is composed of calcium silicate alite, berite and celite. The clinker serves to promote mixing of the binder and water. The clinker is preferably included in the range of 0.5 to 5% by weight in the binder, when the content of the clinker is less than 0.5% by weight is not easy to mix the binder and water, the strength is greater than 5% by weight There is a problem of deterioration.

In addition, the plaster (plaster) in the present invention serves to easily mix the components contained in the binder with water. The plaster is preferably contained in the range of 0.5 to 5% by weight in the binder, therefore, when the content of the plaster is less than 0.5% by weight, there are problems that various components contained in the binder are not easily mixed with water. In the case where the content exceeds 5% by weight, the strength, chemical resistance, and the like are lowered.

In the present invention, the alpha-type hemihydrate gypsum is obtained by heating the dihydrate gypsum at a temperature of about 75 to 100 ° C. for 1 hour or more under a reduced pressure of -600 torr or higher, and is prepared as an alpha-type hemihydrate gypsum by reduced pressure heating. Alpha-type hemihydrate gypsum exhibits nearly zero shrinkage expansion and suppresses cracking caused by shrinkage expansion. More specifically, gypsum is generally divided into natural gypsum and chemical gypsum, the purity of which is usually determined according to the content of SO ₃ and divided into dihydrate gypsum, hemihydrate gypsum, and anhydrous gypsum, depending on the amount of crystalline water in the gypsum. do. Dihydrate gypsum is transferred to alpha-type, beta-type, or anhydrous gypsum, depending on dehydration conditions. If it is dehydrated in a dry state, it is converted to beta-type. Alpha type hemihydrate gypsum has more than 10 times stronger strength than beta type hemihydrate gypsum, has a short initial curing time, and has an effect of suppressing cracks due to shrinkage expansion. In addition, the alpha-type hemihydrate gypsum serves to enhance the high strength, quickness and expandability with the CSA-based expander described later, and serves to compensate for the disadvantages of the CSA-based expander.

In the present invention, the alpha-type hemihydrate gypsum is preferably included in the range of 0.5 to 5% by weight in the binder, when the content of the alpha-type hemihydrate gypsum is less than 0.5% by weight, the resistance to cracking is lowered, 10 weight In case of exceeding%, the reaction rate is faster, and thus the pot life is shortened.

In addition, in the present invention, the fly ash (fly ash) is a component of burning coal in a facility using coal as a fuel, such as a thermal power plant remains in the form of oxide silicon oxide (SiO ₂ ) or aluminum oxide (Al ₂ O ₃ ) component Means that it remains as fine dust. When the fly ash is mixed and used, the workability is improved, the heat of curing is lowered, and the long-term strength and the watertightness are improved to be economical. The fly ash is preferably included in the range of 0.01 to 5% by weight in the binder, when the content of the fly ash is less than 0.01% by weight, the adhesion performance of the repair reinforcing agent is lowered, if it exceeds 5% by weight There exists a problem that chemical resistance falls.

In addition, the red mud in the present invention serves to increase the initial strength of the repair reinforcing agent according to the present invention, the main constituents include SiO ₂ and Al ₂ O ₃ and trace amounts of Fe ₂ O ₃ , MgO, Na ₂ O and the like. In the present invention, the red mud is preferably included in the binder in the range of 0.1 to 5% by weight, when the content is less than 0.1% by weight, the effect of improving the initial strength of the repair reinforcing agent is lowered, exceeding 5% by weight. In this case, the effect of improving strength is no longer increased.

In addition, the calcined pozzolana in the present invention is prepared by adding calcium to the natural pozzolana mainly composed of red volcanic soil, which is a fine grain, and serves to improve the waterproofness of the water reinforcing agent according to the present invention. do. Specifically, calcined calcined sorophorana was a mixture of 1-20 parts by weight of calcium and 100 parts by weight of natural pozzola or calcined so as to have an average particle size of 10-20 μm after calcining at 1000-1200 ° C. for 0.5-1 hour. It is desirable to. Hasopozolana treated as described above serves to increase the tightness of the tissue when applied to the mortar to increase the waterproofness and strength. It is preferable that the calcined phosphozolana is included in the range of 0.01 to 5% by weight in the binder. When the content of the calcined phosphozolana is less than 0.01% by weight, the water resistance of the repair reinforcing agent is lowered, and when the content exceeds 5% by weight. There is a problem that the strength of the repair reinforcing agent is lowered.

In addition, in the present invention, the microsilica is a silica particle having a particle diameter of 10 to 200㎛, and serves to improve the strength and chemical resistance of the repair reinforcing agent according to the present invention. The microsilica is preferably included in the range of 0.01 to 5% by weight in the binder, when the content of the microsilica is less than 0.01% by weight, the strength and chemical resistance of the repair reinforcing agent is lowered, when it exceeds 5% by weight There is a problem that the adhesion performance of the repair reinforcing agent is lowered.

In addition, in order to repair the reinforcement of the underwater concrete structure may be additionally included in the binder in water 0.1 to 3% by weight in the binder. The water-insoluble agent is added in order to improve the viscosity of the mortar composition in water to prevent degradation, methyl-based cellulose such as methyl cellulose, hydroxymethyl cellulose, carboxymethyl cellulose; Ethyl cellulose such as ethyl cellulose, hydroxyethyl cellulose and carboxyethyl cellulose; Cellulose thickeners selected from propyl celluloses 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, 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.

In addition, if necessary, with respect to 100 parts by weight of the binder, one or more additives selected from 0.1 to 10 parts by weight of a dispersant, 0.01 to 3 parts by weight of a defoaming agent, and 0.01 to 10 parts by weight of a retardant may be further included.

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 dispersant, a conventional water reducing agent can be used. For example, a lignin sulfonate, a polynaphthalene sulfonate, a polymelamine sulfonate, or a polycarboxylate water reducing agent can be used alone or in combination of two or more. 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 the large pores in the mortar to improve the strength and appearance of the mortar. Defoamers include mineral oil-based defoamers such as kerosene, liquid paraffin, and the like; 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, 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; Fuminic 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 synthetic slag fine powder comprising a mixture of cement, blast furnace quenching slag and blast furnace slow cooling slag, glass powder, shrinkage reducing agent, polymer resin, fiber, silica fume, clinker, plaster, alpha-type hemihydrate gypsum, ply Silica sand is mixed with a binder composed of ash, red mud, calcined fosola, and microsilica to prepare a dry mortar premix composition, and predetermined water is mixed thereto 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.

The mortar composition obtained as described above is applied to the surface to be repaired to reinforce the cross section of the concrete structure. When repeated one or more times, the surface is polished and roughly finished for adhesion to the surface, and the coating is sprayed or Using a trowel, it is preferable to construct and plaster 5 ~ 15 mm for the first place, 20 to 50 mm for the second place and the third place, and 5 to 15 mm for the final place, but the thickness depends on the thickness of the chipped concrete. you can change it.

3. Application of surface coating

The mortar composition is applied to the concrete crushed portion to smoothly finish and dry the surface to be repaired by applying a thin coating of the surface coating agent according to the present invention on the surface to reinforce it from external conditions.

The surface coating agent according to the invention is applied in the following order. In other words,

The mortar composition is coated to apply a primer including cement, admixture, liquid sodium silicate, liquid polysilane, and water to the cured surface, and the epoxy base, the amine-based curing agent, and water are applied to the surface to which the primer is applied. Applying a water-based epoxy paint, and applying a surface coating agent by applying a water-based urethane paint comprising a water-dispersible acrylic urethane resin, a sieving pigment and a silane to the surface on which the epoxy paint is applied to apply a surface coating agent do.

Hereinafter, a specific method of coating the surface coating agent will be described in detail.

First, a primer is applied to the surface of the mortar composition by applying to the concrete crushing site.

The primer used in this step is used to improve the water resistance and durability of the mortar surface, and to strengthen the binding force between the mortar surface, which is a coating material, and a subsequent coating.

The primer used in the present invention is 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. It is composed.

The cement and the admixture penetrates into the damaged part of the structure due to the external environment and serves to reinforce the structure from harmful substances and increase durability.

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

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

The liquid polysilane is obtained by mixing a silane monomer in an organic solvent and then polymerization. More specifically, at least one silane monomer selected from dichloromethylphenylsilane, dichlorodimethylsilane, dichlorodiphenylsilane, dichlorohexylmethylsilane, and dichlorovinylmethylsilane is mixed with an organic solvent, followed by dispersing a metal catalyst and performing polymerization. The polymer obtained by filtering the polymer to separate the silicone polymer and then dissolving it in an organic solvent may be used.

The primer obtained by the composition can tightly fill and expand the pores of the structure surface to enhance the adhesive bonding force with the coating applied afterwards, and can improve physical properties such as water resistance and durability.

Subsequently, after the primer is applied and cured, an aqueous epoxy paint is applied to the surface to which the primer is applied.

In the present invention, the water-based epoxy paint uses an water-based epoxy paint comprising an epoxy main material, an amine curing agent, and water.

Specifically, the water-based epoxy paint is an water-based epoxy paint comprising an epoxy main material, an amine curing agent, and water, wherein the epoxy main material is 20 to 40 parts by weight of a liquid epoxy resin, 5 to 10 parts by weight of a hydroxyl group-containing polyester resin, and vanadium. Acid metal salt 0.2-2.0 parts by weight, water 10-30 parts by weight, dispersant 0.5-2.0 parts by weight, defoamer 0.2-1.0 parts by weight, thickener 0.2-2.0 parts by weight, extender pigment 5-20 parts by weight, wetting agent 0.2-2.0 parts by weight The amine-based curing agent comprises 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, and 0.2 to 3.0 parts by weight of a thickener. The mixing ratio of is characterized by using a paint obtained by mixing at a weight ratio of 10: 3 to 10 and water is post-added to 100 to 500 parts by weight based on 100 parts by weight of the mixture of the epoxy main material and the amine curing agent obtained above. do.

First, as the epoxy main component, 20 to 40 parts by weight of a liquid epoxy resin, 5 to 10 parts by weight of hydroxyl group-containing polyester resin, 0.2 to 2.0 parts by weight of metal vanadate, water 10 to 30 parts by weight, and a dispersant 0.5 to 2.0 parts by weight. It comprises a defoaming agent 0.2-1.0 parts by weight, thickener 0.2-2.0 parts by weight, sieving pigment 5-20 parts by weight, wetting agent 0.2-2.0 parts by weight.

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

As the hydroxyl group-containing polyester resin, a polyester resin containing a hydroxyl group or a modified resin thereof may be used, and specifically, a polycondensate of a polyhydric alcohol and a polybasic acid may be used. In this case, the polyhydric alcohol may be ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, neopentyl glycol, 1,2-butanediol, 1,3-butanediol, polycaractone polyol, glycerin , Sorbitol, and the like, and the polybasic acid may be phthalic acid, phthalic anhydride, tetrahydrophthalic acid, tetrahydrophthalic anhydride, trimellitic acid, trimellitic anhydride, terephthalic acid, fumaric acid, itaconic acid, adipic acid, succinic acid, cyclo Hexane-1,4-dicarboxylic acid and the like can be used.

Moreover, as modified resin of the polyester resin containing the said hydroxyl group, a urethane modified polyester resin, an epoxy modified polyester resin, an acrylic modified polyester resin, a silicone modified polyester resin, etc. are mentioned, for example.

It is preferable to use the hydroxyl-containing polyester resin or its modified resin 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, characterized in that made of water-soluble. As a specific example, calcium vanadate, potassium vanadate, etc. can be used.

The dispersant is used to ensure color uniformity by dispersing the extender pigment in the liquid phase when the main mixture. As such a dispersing agent, it can select and use 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 non-ionic or silicone antifoaming agent may be used.

The thickener is used to prevent sedimentation of the extender pigment and to improve workability. Specifically, the thickener may be selected from bentonite, urethane, and acrylic thickeners.

The extender pigment serves to improve the coating film strength and to create irregularities on the surface of the coating film, thereby improving the adhesion to 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 smoothly form a coating film of a water-soluble epoxy resin that is water-soluble by imparting hydrophilicity to the material, and specifically, a hydroxyethyl cellulose-based wetting agent may be used.

The amine curing agent serves to promote curing of the epoxy handmade component.

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

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

Other components such as the antifoaming agent, thickener and the like may be the same or different from those used in the epoxy main ingredient.

In order to form the water-based epoxy paint in the present invention, the mixing ratio of the epoxy main material to 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 obtained epoxy main material and the amine curing agent. It is preferable to use the coating material obtained by post-addition to 100-500 weight part.

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

The coating of the water-based urethane-based paint is applied to the water-based urethane-based paint comprising a water-dispersible acrylic urethane resin, a extender pigment and a silane.

Specifically, the aqueous urethane-based paint is 50 to 80 parts by weight of water-dispersible acrylic urethane resin, 0.2 to 2.0 parts by weight of dispersant, 0.5 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 antifoam, 0.2 to silane. It is characterized by comprising a 2.0 parts by weight and a co-solvent 0.2 to 5.0 parts by weight.

The aqueous acrylic urethane resin is 2-hydroxyethyl methacrylate (2-HEMA: 2-hydroxyethyl methacrylate), methyl methacrylate (MMA: methyl methacrylate), n-butyl acrylate (n-BA: n-butyl Polyurethane acrylate hybrid emulsion may be used by adding an acrylate monomer selected from acrylate) and acrylic acid (AAc) and anionic or nonionic emulsifier and initiator. The water-dispersible acrylic urethane resin is fast drying and excellent weather resistance, durability, ultraviolet stability even under external exposure conditions and is made of water-soluble and is environmentally friendly.

The dispersing agent is to uniformly disperse the extender pigment in the liquid phase when mixing the water-soluble urethane-based paint to form a coating film of uniform color, in the present invention, non-ionic polyoxyalkylene type surfactant or anionic type polycarboxylic salt type Any one selected from the surfactants can be used.

The thickener is to prevent the settling of the pigment and to improve the workability during coating, in the present invention may be any one selected from bentonite-based, urethane-based, acrylic-based.

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

The antifoaming agent is to form an even coating film by suppressing bubbles in the water-soluble urethane-based paint. In the present invention, any one selected from nonionic or silicon-based may be used.

The silane is to enhance adhesion and to improve the water resistance and durability of the coating film, glycidoxypropyl methyl diethoxy silane, gamma methacryloxy propyl triethoxy silane, gamma glycidoxy propyl triethoxy silane, gamma amino Any one selected from propyl triethoxy silane and vinyltrimethoxy silane can be used.

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

The surface coating to be constructed by the above method is excellent in the bonding strength and durability with the mortar surface, which is the conductor by using the above-described eco-friendly paint composition, in particular, also excellent in chemical resistance, water resistance, salt resistance, etc. The effect is excellent. In addition, since the organic solvent or heavy metals are not eluted as water-soluble, it is environmentally friendly, and since the life of the coating 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 with reference to Examples. However, the scope of the present invention is not limited by the following examples.

EXAMPLE

( Production Example  1) Mortar composition preparation

The blast furnace quenching slag and blast furnace slow cooling slag are 5 parts by weight of gypsum (natural gypsum), 1.5 parts by weight of soluble silicate (sodium silicate), 0.8 parts by weight of ionized lithium (lithium hydroxide), and a silane compound in a weight ratio of 8: 2. (First alkylalkoxysilane) A synthetic slag fine powder composed of a mixture treated to have a specific surface area of 1,000 to 5,000 cm ² / g was prepared through a mechanochemical activation process in which 1.0 parts by weight of the mixture was mixed and ground in a vibration mill. .

50 parts by weight of Portland cement, 20 parts by weight of the obtained synthetic slag fine powder, 15 parts by weight of glass powder having a powder degree of about 2,000 cm ² / g, shrinkage in which calcium sulfoaluminate and phosphate anhydrite are mixed in a weight ratio of 7: 3 5 parts by weight of reducing agent, 1.0 part by weight of polymer resin (EVA resin), 1.0 part by weight of fiber (30 parts by weight of polypropylene, 40 parts by weight of nylon and 30 parts by weight of arbocell fiber), 2.0 parts by weight of silica fume, 2 parts by weight of clinker A binder was prepared by mixing parts, 1 part by weight of plaster, 1.5 parts by weight of alpha-type hemihydrate gypsum, 2.5 parts by weight of fly ash, 1.5 parts by weight of red mud, 3.5 parts by weight of calcined fosola, and 3 parts by weight of microsilica.

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.

( Production Example  2) Mortar Composition Preparation

The blast furnace quenching slag and blast furnace slow cooling slag are 5 parts by weight of gypsum (fuel desulfurized gypsum), 1.5 parts by weight of soluble silicate (potassium silicate), 0.8 parts by weight of ionized lithium (lithium oxide) and silane, in a weight ratio of 8: 2. Synthetic slag fine powder consisting of a mixture treated with a specific surface area of 1,000 to 5,000 cm ² / g through a mechanochemical activation process of mixing and grinding a mixture of 1.0 parts by weight of a compound (first alkylalkoxysilane) in a vibration mill It was.

50 parts by weight of Portland cement, 20 parts by weight of the obtained synthetic slag fine powder, 15 parts by weight of glass powder having a powder degree of about 2,000 cm ² / g, shrinkage in which calcium sulfoaluminate and phosphate anhydrite are mixed in a weight ratio of 7: 3 5 parts by weight of reducing agent, 1.0 part by weight of polymer resin (EVA resin), 1.0 part by weight of fiber (30 parts by weight of polypropylene, 40 parts by weight of nylon and 30 parts by weight of arbocell fiber), 2.0 parts by weight of silica fume, 2 parts by weight of clinker A binder was prepared by mixing parts, 1 part by weight of plaster, 1.5 parts by weight of alpha-type hemihydrate gypsum, 2.5 parts by weight of fly ash, 1.5 parts by weight of red mud, 3.5 parts by weight of calcined fosola, and 3 parts by weight of microsilica.

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 Production Example  1) Mortar composition preparation

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, and 20 parts by weight of synthetic slag fine powder having an average particle diameter of 2 to 10 μm, calcium sulfoaluminate and phosphate anhydrite gypsum 7: 3 A binder was prepared by mixing 5 parts by weight of the shrinkage reducing agent, 1.0 part by weight of the 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, and 20 parts by weight of synthetic slag fine powder having an average particle diameter of 2 to 10 μm, calcium sulfoaluminate and phosphate anhydrite gypsum 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 fibers and 0.5 part by weight of sodium bicarbonate, 0.5 part by weight of water-insoluble agent (methyl cellulose), 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.

( Production Example  3) Surface Coatings Manufacturing

A primer formed by mixing 15 parts by weight of portant cement, 10 parts by weight of a mixture composed of a mixture of slag powder and fly ash, 30 parts by weight of liquid sodium silicate, 10 parts by weight of liquid polysilane and 60 parts by weight of water was prepared.

As an aqueous epoxy paint, 30 weight part of bisphenol-A epoxy resin, 8.5 weight part of epoxy modified polyester resins (number average molecular weight about 20,000, glass transition temperature about 80 degreeC), 1.0 weight part of calcium vanadate, 20 weight part of water 1.0 parts by weight of a dispersant, 0.5 parts by weight of an antifoaming agent, 0.5 parts by weight of a thickener, 10 parts by weight of a sieving pigment, 0.8 parts by weight of a humectant to obtain a main component, 40 parts by weight of an amine compound, 30 parts by weight of water, an antifoaming agent of 0.8 parts by weight, a thickener 1.5 parts by weight of the mixture was obtained to obtain a curing agent component, followed by mixing in a weight ratio of 10: 5 in the mixing ratio of the main agent to the hardener, and after the addition of about 300 parts by weight of water to 100 parts by weight of the mixture of the obtained main agent and the curing agent to prepare a paint. It was.

As the water-based urethane-based paint, 60 parts by weight of an aqueous acrylic urethane resin, 1.0 part by weight of a dispersant, 0.9 part by weight of a thickener, 15 parts by weight of an extender pigment, 0.9 part by weight of an antifoaming agent, 1.5 parts by weight of silane, and 2.5 parts by weight of a coarse solvent were prepared. .

( Comparative Production Example  4) Manufacture of surface coating

Prepared in the same manner as in Preparation Example 3, the preparation of the primer was omitted.

( Comparative Production Example  5) Surface Coatings Manufacturing

Prepared in the same manner as in Preparation Example 3, the production of the water-based epoxy paint was omitted.

( Comparative Production Example  6) Surface Coatings Manufacturing

Prepared in the same manner as in Preparation Example 3, the production of the water-based urethane paint was omitted.

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 coating agent prepared in Preparation Example 3 was applied to the dried mortar surface in order of a primer, an aqueous epoxy paint, and an aqueous urethane paint in a total thickness of 200 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 was coated using the surface coating agent prepared in Comparative Preparation Example 4.

Comparative Example 2

The same procedure as in Example 1 was carried out except that the surface was coated using the surface coating agent prepared in Comparative Preparation Example 5.

Comparative Example 3

The same procedure as in Example 1 was performed except that the surface was coated using the surface coating agent prepared in Comparative Preparation Example 6.

Performance evaluation

1. Physical properties of mortar composition

Test specimens were prepared using the mortars prepared in Preparation Examples 1 to 2 and Comparative Preparation Examples 1 to 3, and physical properties thereof were measured by the following test methods.

1) Condensation 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 in accordance with KS L 5220

The results are shown in Table 1 below.

Item Preparation Example 1 Preparation Example 2 Comparative Production Example 1 Comparative Production Example 2 Comparative Production Example 3 Setting time (minutes) First 35 33 120 53 60 closing 45 42 245 95 105 Flexural strength
(N / mm ² ) gin 13 12 9 8 7 Underwater 9 10 8 7 6 Compressive strength
(N / mm ² ) gin 65 64 46 49 51 Underwater 59 60 47 45 48 Adhesion strength
(N / mm ² ) gin 3.3 3.2 3.5 1.0 2.2 Underwater 1.9 2.4 0.9 0.9 1.2 Length change rate (%) 0.001 0.002 -0.27 0.15 0.16 Flow (mm) 130 135 135 118 120

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 using the conventional portland cement as a binder or when the glass powder is not used. .

2. Antirust , Adhesion strength, Acid resistance , Flex resistance, water resistance evaluation

The antirust, adhesion strength, acid resistance, flex resistance, and water resistance of the coating films formed according to Example 1 and Comparative Examples 1 to 3 were evaluated, and the results are shown in Table 2.

Sample Antirust (ASTM D610) Adhesion Strength (KSM6715-01)
(kgf / ㎠) Acid resistance
(KSMSI02812-1-02) Flex resistance
(KS M 5000-03, Φ10mm, 180 ° Bend) Water resistance
(KSMSI02812-2-02) Example 1 0.1% or less 39 clear clear clear Comparative Example 1 0.2% or less 31 clear clear clear Comparative Example 2 0.3% or less 32 clear clear clear Comparative Example 3 0.2% or less 32 clear clear clear

 When the coating using the coating composition prepared in the present invention from the results of Table 2, it can be confirmed that there is an excellent characteristic in the adhesion strength, and also excellent results in other physical properties.

3. Flame retardancy, weather resistance, chloride ion penetration resistance, impact resistance evaluation

The flame retardancy, weather resistance, chloride ion penetration resistance, and impact resistance of the coating films formed according to Example 1 and Comparative Examples 1 to 3 were evaluated. (The flame retardancy was evaluated by the method of UL94, and other physical properties were evaluated by the method of KS F 4929 (2010).)

As a result of the evaluation, the flame retardancy showed self-extinguishing property in all samples, and in all other properties, all samples showed suitable or abnormal results.

From the above experimental results, it can be confirmed that the surface coating agent according to the present invention has excellent coating properties such as excellent mechanical and chemical properties when the surface reinforcement construction of the concrete structure.

Claims (9)

(1) chipping the cross section of the concrete structure in need of repair to trim until an undamaged portion is produced;
(2) Synthetic slag fine powder having 30 ~ 75 wt% cement, blast furnace quenching slag and blast furnace quenching slag in the weight ratio of 7 ~ 9: 1 ~ 3 in the trimmed concrete section with a powder degree of 1,000 ~ 5,000 cm ² / g 5 to 45% by weight of the mixture, 5 to 30% by weight of glass powder having a powder degree of 1,000 to 3,000 cm ² / g, 3 to 20% by weight of shrinkage reducing agent, 0.5 to 1.5% by weight of polymer resin, 0.2 to 2% by weight of fiber, 1-5 wt% silica fume, 0.5-5.0 wt% clinker, 0.5-5.0 wt% plaster, 0.5-5 wt% alpha-type hemihydrate gypsum, 0.01-5 wt% fly ash, 0.1-5 wt% red mud, calcined sol Rana comprises 0.01 to 5% by weight, 100 parts by weight of the binder consisting of 0.01 to 5% by weight of microsilica and 20 to 100 parts by weight of silica sand and water,
The synthetic slag fine powder mixture is 100 parts by weight of the mixture of the blast furnace quench slag and blast furnace slow cooling slag during the fine powdering process of the blast furnace quench slag and blast furnace slow cooling slag, 0.1 to 10 parts by weight of flue gas desulfurization gypsum, 0.1 to 5.0 parts by weight of potassium silicate, Mechano which mixes and grinds the mixture which mixed 0.1-3.0 weight part of lithium oxides and 0.1-3.0 weight part of 1st alkyl alkoxysilanes in a vibration mill for 5 to 60 minutes, and makes the specific surface area of the mixture into 1,000-5,000 cm <^2> / g. Applying a mortar composition, characterized in that the chemically activated mixture; And
(3) applying a primer comprising cement, admixture, liquid sodium silicate, liquid polysilane, and water to the surface to which the mortar composition is applied, and including epoxy base, amine-based curing agent and water on the surface to which the primer is applied. Applying an aqueous epoxy paint, wherein the surface is coated with an aqueous urethane paint comprising a water-dispersible acrylic urethane resin, a sieving pigment, and a silane on the surface to which the aqueous epoxy paint is applied; It is configured to include,
The polymer resin in (2) is ethylene vinyl acetate (Ethylene Vinyl Acetate, EVA), NR (Natural Rubber), NBR (Natural Rubber-Butadien Rubber), SBR (Styrene-Butadien Rubber) and polyvinylacetate Any one or a mixture of two or more selected from (Polyvinyl Acetate) -based resin is used, and the fiber includes 20 to 50% by weight of polypropylene fiber, 20 to 50% by weight of nylon fiber and 30 to 60% by weight of arbocel fiber. Eco-friendly repair reinforcement method of the cross section of the concrete structure, characterized in that made.
delete delete delete delete delete The method of claim 1, wherein the polymer resin is 20 to 50% by weight of EVA resin and 50 to 80% by weight of the acrylic reemulsification resin eco-friendly maintenance reinforcement method of the cross section of the concrete structure.
The method according to claim 7, wherein the acrylic re-emulsifying resin 100 parts by weight of the total monomer consisting of 80 to 90% by weight acrylic polymer and 10 to 20% by weight monomer having a crosslinkable functional group; 0.1 to 5 parts by weight of a reactive anionic emulsifier and a nonionic emulsifier; 0.01 to 1 part by weight of polymerization initiator; And an acrylic emulsion polymer obtained by polymerizing a preemulsion including 45 to 50 parts by weight of water.
The method of claim 8, wherein the monomer having a crosslinkable functional group is methacryloxypropyltrimethoxysilane, acrylonitrile, acetoacetic ethyl methacrylate, divinylbenzene, ethylene glycol dimethacrylate, butanediol dimethacrylate , Cyclohexyl methacrylate and 3-chloro-2-hydroxypropyl methacrylate, one or two or more selected from the group consisting of environmentally friendly repair reinforcement method of the concrete structure cross section.