KR102072939B1 - Method for Recovering and Maintaining Surface of Concrete Construction Using Maintaining Putty with High Viscosity and High elasticity - Google Patents

Abstract

The present invention relates to a method for repairing cracks in concrete walls such as high-rise buildings and apartments. The present invention comprises: a step of applying repair mortar on a damaged wall to repair a damaged concrete section due to a crack; a step of filling the concrete wall crack portion with an eco-friendly acrylic elastic putty material by using an elastic putty material composition for repairing a crack on an exterior wall of a building with excellent adhesive strength, crack followability (extension rate), tensile strength, low-temperature flexural resistance, topcoat suitability, water resistance, and alkali resistance; and a step of submerging a ground surface after the cracked portion is arranged, and applying a plastering finish material by mixing powder and a liquid while slowly adding the powder to the liquid. As a result, it is possible to economically and eco-friendly repair the damaged concrete section due to a crack.

Description

Method for Recovering and Maintaining Surface of Concrete Construction Using Maintaining Putty with High Viscosity and High elasticity}

The present invention relates to crack repairing methods for concrete walls such as high-rise buildings and apartments.In order to repair damaged concrete sections due to cracks, the repair mortar is applied to damaged wall parts, followed by the adhesion strength and crack cracking (elongation rate). By using elastic putty material for acrylic crack repair and excellent eco-friendly acrylic crack repair, it has excellent tensile strength, low temperature bending resistance, low temperature bending resistance, water resistance, alkali resistance, and it is eco-friendly and economically repaired. It is about repairing the exterior walls of apartments using many high-viscosity high-elastic crack repair putty materials.

Buildings, such as buildings and apartments, generally correspond to most concrete structures, where concrete consists of aggregates such as water, cement, sand, and gravel, and uses hydrated reactions, which cement and water react to solidify. It is used to form architectural structures such as bridges and tunnels. The degradation of concrete is greatly affected by moisture, water acts as a medium to degrade concrete, and dissolved sulfates, nitrates, carbonates, and acid rains can accelerate the damage of concrete structures. It is inevitable that voids are formed in the concrete during the hydration reaction, which hardens the concrete. These internal voids create a path through which moisture penetrates the concrete structure. If moisture penetrates through the internal voids, it can cause microcracks due to freezing and melting, etc. If the microcracks are partly damaged, they can greatly affect the service life of the concrete structure by corroding the rebars at the same time.

In general, reinforced concrete structures, which cover most of the construction structures, are subject to ageing of the structures according to the age and age of the construction, and cracks, peeling, peeling, and cracking on the seashore are caused by shrinkage and expansion due to shrinkage, expansion, etc., due to changes in the domestic environment and temperature changes. As the salt penetrates into the concrete, the passive copper film formed on the rebar is lost (destruction), which causes corrosion of the rebar.The surface of the concrete is exposed to the air for a long period of time during the contaminated atmosphere, and carbon dioxide and cement are hydrated to react with iron. do. At this time, the corrosion of reinforcing steel is caused by the volume expansion of the steel, and the durability of the building is reduced due to the cracking and cross-sectional dropping of the concrete.

In the conventional exterior wall repair method for deterioration such as the above, in the cross-sectional recovery method, the peeled and peeled parts of the outer wall concrete of the building are removed, and after the cleaning, the parts of the concrete are primed and the polymer resin is mixed with the polymer surface. The repair method and the method of applying the putty material are mainly applied to the part where the fine crack has occurred.

In many cases, when built in factories, wastewater and sewage areas, severe chemical degradation occurs due to penetration by several chemicals. For example, if the concrete structure is brought into contact with an acidic air atmosphere or a direct acidic wastewater in which a large amount of sulfuric acid compounds such as hydrogen sulfide and hydrogen are present, the aging of the structure may be accelerated. In addition, deterioration of concrete structures may occur due to acid conditions generated by the action of microorganisms in sewage treatment facilities or sewage pipelines, which may cause erosion. As a method to prevent the weakening of the durability of the concrete structure, a method of applying an absorbent or coating liquid to the surface of the concrete is used. The method of using the above-mentioned absorption inhibitors has been carried out using absorption agents made of paraffin-based hydrocarbon compounds or fatty acid-based oils, but the penetration depth is not easily obtained, and the effect of improving the durability is not significant. Alternatively, silicone-based resins or oils were diluted with organic solvents, and water-repellents or anti-absorbents were used.However, due to the nature of the solvents, they are fluid stones, which are currently limited in their use due to pollution problems and adverse effects on the human body.

In addition, fillers have been used as a coating liquid in polymers of acrylic resin resins. However, there have been insufficient surfaces in terms of physical properties such as adhesion strength, durability, and compressive strength to the concrete.

On the other hand, Patent Document 1 discloses a repair process for an exterior wall of an apartment, and here, a process of repairing and repairing a high-rise building with deteriorated cracks and bricks and an exterior wall of an apartment, and performing different ground surface treatments for each crack and site. As a step of repairing and cracking the cut and crack parts of the exterior wall of the building surface treated with the surface, the primer coating is omitted in a state where the primer is applied to the surface of the exterior wall of the surface treated building. After recovering the cross-section, apply the putty material composition on the surface of the hardened mortar composition, and directly fill and apply the putty material composition to the cracked portion of the exterior wall of the surface-treated building. A technique including the step of coating the end of the water-based paint for the external cross-section the recovery and repair the crack surface is disclosed. However, the materials to be mixed are complex, the process is complicated and uneconomical.

Patent Document # 2 discloses a crack repair putty filler, which includes acrylate-based copolymer-binders 20 to 45 wt%, inorganic fillers 40 to 60 wt%, and inorganic fillers with modified silane coupling agents 3 to 10 wt%. And functional additive 1 to 5% by weight,

The inorganic filler is a hard calcium carbonate, and the inorganic filler is modified with a silane coupling agent. The average particle diameter is modified with a silane coupling agent with a mean particle size of 6 µm to 12 µm, a pH of 8.0 to 10.0, a specific gravity of 2.8 to 22.92, and a molecular weight of 340. 350 phosphorus, and the functional additives include hydroxyethyl cellulose as a thickener, aluminum silicate thickener, ammonia anhydride as a pH regulator, dioctyl adipate as a plasticizer, mineral oil-based antifoaming agent, and isothiazole-based antiseptic aldehyde Disclosed is an elastic putty material composition for crack repair of concrete structures comprising a dispersant.

On the other hand, Patent Document 3 discloses a surface protective coating method using concretes and steel structures, surfaces, coatings, and coatings, whereby concrete and steel surface surfaces are coated with a coating composition, methyl methacrylate, no butyl acrylate, and butyl monomers. A first liquid phase component comprising methyl acrylate and isobornyl acrylate; Structures consisting of a surface-protective coating agent composition consisting of a third liquid component containing an initiator and a second liquid component including an emulsifier, and the like, which are coated and cured on the surface of the object to be applied by coating, rolling or spraying. A surface protection technique is disclosed.

Patent Document 1: Republic of Korea Registered Patent 10-1744067 Patent Document 2: Republic of Korea Patent No. 10-1744500 Patent Document 3: Republic of Korea Registered Patent 10-1687672

The present invention aims to provide a repair method for the exterior walls of apartments using high-viscosity, high-elastic crack repair putty materials that can be implemented environmentally and economically in order to solve the problems of the prior art described above.

In addition, the present invention is a concrete building exterior wall is omitted by using a high-elasticity putty material composition, such as improved mortar composition with improved pot life and adhesion strength, and improved physical properties and dispersion stability and cross-sectional damage problems in the curing process The purpose of this is to provide a remuneration method.

In order to achieve the above object, a crack repair method for a concrete building surface according to the present invention includes the steps of: constructing a high strength repair material on a damaged wall part to recover a damaged concrete section due to cracks;

Subsequently, the cross-sectional recovery using a high-strength repair material, followed by filling an acrylic eco-friendly putty material into the concrete wall crack site; And

After cleaning the site where the cracks are generated, the base surface is moisturized, and the powder is slowly added to the liquid and mixed to apply a plaster finish.

In addition, the present invention may include the step of applying an anti-rust protective material to prevent corrosion of the rebar exposed to the concrete building surface. At this time, the anti-rust protection material used may include at least one of zinc powder, magnesium powder, aluminum powder, silicon powder, titanium powder and zirconium powder. As another example, it may include an acrylic-silicon copolymer and a metal oxide powder which is at least one of silicon oxide (SiO 2), aluminum oxide (Al 2 O 3), zirconium oxide (ZrO 2), and titanium oxide (TiO 2).

In addition, the high-strength repair material used for repairing damaged sections in the present invention, 20 to 30 parts by weight of silica sand, blast furnace slag 15 to 20 parts by weight, 30 to 40 parts by weight of Portland cement, 4 to 7 parts by weight of lime, and an ethylene polymer It is a mortar composition containing 5-10 weight part of powder resin which consists of a mixture of a styrene / butadiene rubber type polymer.

The acrylic eco-friendly crack putty material is a water-soluble acrylic waterproofing agent composed of 40 to 60% by weight of water-dispersed urethane-acrylate hybrid rubber, 10 to 15% by weight of styrene-butadiene rubber, 20 to 25% by weight of polyolefin, and 10 to 20% by weight of filler. 50 wt%; (b) 40 to 45% by weight of modified latex moldin; (c) 50 to 65% by weight of an aqueous acrylic resin, 5 to 50% by weight of a filler composed of at least one component selected from aerosol silica, quartz powder, calcium carbonate powder, precipitated silica and diatomaceous earth powder, and 5 to 30% by weight of silicone oil. It manufactures by mixing 5-15 weight% of water-soluble acrylic sealants to contain.

The crack putty material was further freeze composed of 15 to 25% by weight of the resin mixed with acrylic resin, 0.1 to 1.0% by weight of thickener, 0.3 to 1.0% by weight of dispersant, 0.3 to 1.0% by weight of preservative, and propylene glycol. The water-soluble functional additive which consists of 0.3-1.0 weight% of inhibitors, 0.1-0.5 weight% of antifoamers, 0.1-0.5 weight% of pH adjusters, 5-10 weight% of surfactants, and 65-75 weight% of diluent solvents may be included. Can be.

As described above, according to the present invention, since the metal powder or the mixed metal powder is included as the rust preventive agent, there is an effect of preventing the corrosion of the rebar exposed by cracks or peeling. Therefore, damage to the putty material due to seasonal temperature changes is prevented, and adhesion and waterproofness are increased to prevent corrosion and peeling of structural materials due to leakage, and to prevent secondary cracks and corrosion on the repair site. It is effective to maintain a steady and steady state of repair.

In addition, the present invention is environmentally friendly due to the use of `` compositions made of water-soluble '' and excellent elasticity of the whole composition, and also excellent adhesion is not lowered even during deformation due to interlocking vibration and climate change, excellent waterproofness, compared to the conventional In addition, the crack cracking trackability (elongation rate) and tensile strength can be greatly improved, and eco-friendly and economical properties can be improved by using an eco-friendly acrylic crack repair-elastic material composition.

Furthermore, in the present invention, the mortar composition, which has fast-paced properties, can be repaired and repaired within 7 hours of portland cement in less than 3 hours, resulting in high strength and excellent adhesion and waterproof, durability, chemical resistance, flame resistance, chemical resistance, and chemical resistance. It has the effect of improving the impact resistance, freezing resistance and wear resistance.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. However, in describing the working principle of the preferred embodiment of the present invention, when it is determined that the detailed description of the related known functions or configurations may obscure the gist of the present invention, the detailed description thereof will be omitted. Concrete wall repair construction method of the present invention is carried out through the following steps.

First, when the corrosion rebar is exposed on the surface of the concrete, to prevent the corrosion of the reinforcing bar is coated with a reinforcing bar rust protection (S1). At this time, after the corrosion of the reinforcing bar is completely exposed, the rust and foreign substances are removed, and after the rebar surface is dried, the anti-rust protection material is stirred to disperse the precipitate, and then the anti-rust protection material is applied. If secondary coating is required, use after the initial application is completely dried. It should be done after about 30 ~ 60 minutes based on 20 ℃. Repair materials should be constructed after the rust preventive materials have been completely dried. When rust is washed down to the metal part of the rebar, sandblasting can be carried out. The anti-rust protection material used here is cement resin mortar, which prevents reinforcing steel, maintains excellent adhesion with high-strength polymer repair mortar, is easy to use as a brush, and saves time by 15 to 45 minutes of drying time, Strong adhesion and does not peel off from rebar

In addition, the antirust protection material used in the present invention may include at least one of zinc powder, magnesium powder, aluminum powder, silicon powder, titanium powder and zirconium powder in another embodiment. In addition, it may include an acrylic-silicon copolymer and a metal oxide powder which is at least one of silicon oxide (SiO 2), aluminum oxide (Al 2 O 3), zirconium oxide (ZrO 2), and titanium oxide (TiO 2).

Next, in order to recover the damaged concrete section, a repair mortar is applied to the damaged wall section (S2). For this purpose, dust on the lower surface is removed, and if there is an exposed reinforcing bar, rust is removed from the site. It is preferable to cut the construction site about 10, mm, and to wet the surface by applying clean water. Application of the repair mortar is, for example, applied in the form of plastering using a trowel. The repair mortar used in this stage is a high strength, non-shrinkable and durable material, and it is a non-basic product, which protects the reinforcing steel from corrosion, has excellent resistance to freezing and dissolution, and has a dense structure and excellent waterproof performance. Hold.

As an example, the mortar repair material for the cross-sectional recovery, 20 to 30% by weight of silica sand, 15 to 20% by weight of blast furnace slag, 30 to 40% by weight of Portland cement, 4 to 7% by weight of lime, and ethylene based on the total weight of the repair material A mortar composition comprising 5 to 10% by weight of a powder resin consisting of a mixture of a polymer and a styrene / butadiene rubber-based polymer is used, and a product sold under the tradename Mape Grout 25K or 22K or Planettop CD1 can be used. At this time, 25Kg of a water-retaining polymer and water; Mix for 3-4 minutes using a forced electric mixer at a ratio of 3.25 to 3.75 liters until fully mixed. The construction thickness is about 20kg / m2 based on 10mm standard usage.

In the present invention, following the cross-sectional recovery step using a high-strength repair material, to fill the elastic wall putty material (S3) to the cracks of the concrete wall, to remove the oil, dust, dirt, etc. of the base surface and to apply to the cracks using a putty spatula do. In other words, the ultra-crack seal is filled once (coated) to repair cracks, joint coupling sites, and various gaps generated inside and outside the concrete structure (building). The elastic putty material used in the filling process of the elastic putty material is excellent in resistance to cracks with excellent elongation rate, fast curing time, excellent adhesion, water resistance and elastic sustainability, and also excellent hiding power during paint coating. In addition, it is excellent in adhesiveness with materials such as waterproofing agent and aqueous / oil paint, excellent UV stability, and no discoloration.

The elastic putty material used in the present invention is preferably an acrylic eco-friendly putty material having the following composition. The elastic putty material for crack repair used in the present invention includes (a) 40 to 60% by weight of water-dispersed urethane-acrylate hybrid rubber, 10 to 15% by weight of styrene-butadiene rubber, 20 to 25% by weight of polyolefin, and 10 to 20 fillers. 45 to 50% by weight of a water-soluble acrylic waterproofing agent composed of weight%; (b) 40 to 45% by weight of modified latex-based moldin; (c) 50 to 65% by weight of aqueous acrylic resin, aerosol silica, quartz powder, calcium carbonate powder, precipitated silica, and diatomaceous earth powder. It is preferable to prepare by mixing 5 to 15% by weight of the water-soluble acrylic sealant composed of 5 to 50% by weight of the filler and 5 to 30% by weight of the silicone oil. At this time, the high viscosity high elasticity eco-friendly acrylic putty material used may use a composition sold as Mafeflex AC 510K as an example.

In addition, the elastic putty material is 15 to 25% by weight resin, mixed with acrylic resin, 0.1 to 1.0% by weight thickener, 0.3 to 1.0% by weight dispersant, 0.3 to 1.0% by weight preservative, cryoprotectant 0.3 consisting of propylene glycol (Proplene glycol) -1.0% by weight, antifoaming agent 0.1-0.5% by weight, pH adjuster 0.1-0.5% by weight, surfactant 5-10% by weight, diluent solvent 65-75% by weight may further comprise 2-5% by weight of water-soluble functional additives have.

Next, as a final step, clean up the elastic putty by filling, drying, and cleaning the cracked area, and then moisten the base surface and mix the powder by slowly adding the powder to the liquid to finish the finishing mortar with a brush or trowel. It coats suitably once using (S4). The mortar used in this case may be a product sold under the product name Planetary 25K, or 22k, and has excellent elasticity, excellent resistance to cracking, excellent adhesion, no lifting, and excellent resistance to salts and alkalis. In addition, it has excellent abrasion resistance and weather resistance, provides excellent waterproof performance, and has excellent physical properties such as epoxy coating, paint, and the like.

Next, in addition to finishing the repair of the concrete wall by plastering with the elastic finishing mortar, external repair paint may be applied to the repaired wall (S5) to finish the repair work. At this time, it is common to apply elastic waterproof paint without applying primer on the lower surface, but if the lower surface is not firm or non-absorbent, apply exclusive primer and paint with brush or roller and dilute with water by 10%. It is preferable to use.

Next will be described in more detail with respect to the composition used in the concrete wall surface repair method of the present invention.

First, the antirust protection material for rebar protection used by the repair method of this invention is as follows. Corrosion inhibitors are used to prevent corrosion of reinforcing bars when putty materials are attached to cracked and peeled steel bars. As rust inhibitors, one or two of zinc powder, magnesium powder, aluminum powder, silicon powder, titanium powder and zirconium powder are used. The mixed powder mixed above can be used. This mixed powder increases the corrosion resistance of the steel, and may increase the strength of the adhesive resin layer formed by being mixed on the adhesive resin surface.

Such a mixed powder may be made by mixing fine grain powders having a diameter of 0.1 to 5 μm and granulated powder particles having a diameter of 10 to 35 μm at a weight ratio of 0.1: 5 to 1: 5. At this time, the silicon powder may be mixed in a small amount in a ratio of 0.1 to 5% by weight based on the weight of the metal powder in order to prevent degradation of the adhesive resin layer. And zinc powder by the action sacrificial anode method to prevent corrosion of the reinforcing bar and, to meet the moisture in one or concrete atmosphere, the surface of the steel hydroxide (Zn (OH) ₂₎ or a carbonate (ZnCO3Zn (OH) _2), such as a stable film of I can make it. In addition, zinc powder, magnesium powder, aluminum and silicon powder may be mixed in the same ratio, respectively. Such mixed powder may be 1 to 3% by weight based on the total weight of the composition. Here, when less than 1% by weight, the efficacy of the rust prevention is lowered, and when it exceeds 3% by weight, insulation may be lowered. Here, the rust preventive agent may further include isopropyl alcohol which increases the rust preventive function on the reinforcing bar in response to the rebar surface in order to maximize the rust preventive function.

Here, the rust preventive agent may have a more excellent waterproofing and oxidation resistance by generating a two-component compound by chemical bonding than simply mixing two or more kinds of the above metal oxide particles. For example, the bicomponent compound may be any one of TiO 2 -SiO 2, TiO 2 -Al 2 O 3, and TiO 2 -ZrO 2. Such a two-component system is, for example, mixed with titanium, at least two of silicon, aluminum, zirconium, chlorides, nitrides, acetates in a fixed ratio, and further mixed with an aqueous alkali solution to coprecipitate to form a precipitate. The catalyst powder is then prepared by filtering, washing, drying and calcination steps. At this time, the washing is using distilled water at room temperature, the drying is heated in the air for 6 to 24 hours in the range of 100 to 200 ℃. It can then be made by heating to 500-700 ° C. for 1-24 hours in air using an electric furnace.

As another example, the rust preventive agent may include an acryl-silicon copolymer and a metal oxide powder having excellent waterproofing and ozone resistance in order to obtain corrosion resistance and water resistance and ozone resistance. In addition, the polyolefin resin may be further included to contribute to improving the bonding strength between the acrylic-silicon copolymer and the metal oxide particles, and to improve the slip property, water repellency, and wear resistance of the coating composition.

Here, the metal oxide powder may be at least one of silicon oxide (SiO 2), aluminum oxide (Al 2 O 3), zirconium oxide (ZrO 2), and titanium oxide (TiO 2). At this time, the average diameter of the metal oxide powder may be 10 ~ 150nm, preferably 20 ~ 50nm. In addition, the metal oxide powder may basically contain titanium oxide. This is because titanium oxide absorbs ultraviolet rays and not only prevents durability and discoloration, but also improves stain resistance.

On the other hand, the foaming agent is expanded to a certain volume when the putty material is filled in the crack portion is filled in the crack portion tightly, it may be included to improve the adhesion. This blowing agent is a urethane blowing agent and may be 0.5 to 1% by weight. At this time, if the urethane foaming agent is less than 0.5% by weight, the expansion function is lowered, and if more than 1% by weight may be excessively expanded relative to the filling volume of the putty material.

Next, the mortar composition as a fast curing material used in the cross-sectional recovery step (S2) of the present invention, 20 to 30% by weight of silica sand, blast furnace slag 15 to 20% by weight, Portland cement 30 to 40% by weight, slaked lime 4 A mortar composition is used which comprises from 5% to 7% by weight, and from 5% to 10% by weight of a powder resin consisting of a mixture of an ethylene polymer and a styrene / butadiene rubber polymer. Here, the silica sand is to provide the necessary strength as a basic component of the mortar composition, and the silica anhydrous silicon dioxide SiO 2 component is included. It is used as a raw material for glass products, molding sand, polishing sand, oxidizing furnace brick, etc., and SiO2 96-98% is used. Silica may preferably be size-adjusted in the range of 0.01 to 5.0 mm. The silica is included in the range of 20 to 30% by weight, based on the total weight of the mortar composition, which has fast curing properties in accordance with the present invention. On the other hand, blast furnace slag is a slag that is produced when iron is made from iron ore in a blast furnace, and is a collection of impurities other than iron, which is used as a lagging material, a special fertilizer, blast furnace cement, and a wide range of materials. Used. The blast furnace slag may preferably have a specific surface area of 4,000 to 6,000 cm 2 / g. Blast furnace slag is included in the range of 15 to 20% by weight, based on the total weight of the mortar composition according to the present invention. It contributes to the thermal insulation / sound insulation properties and is used in the above range in consideration of economics. Next, powdered resin means powdered resin, which improves adhesiveness, water resistance, abrasion resistance, chemical resistance, impact resistance, etc., and the mortar composition according to the present invention is placed on the surface of the application. Powders of polymer resins that can be quickly cured after being placed on the construction surface to be repaired, are not particularly limited in the case of conventional prepolymers of this industry for this purpose. The powder resin is preferably vinyl acetate-based polymer, acrylic-based polymer, ethylene-based polymer, ethylene / vinylacetate-based copolymer, ethylene / vinyl chloride-based copolymer, styrene / butylacrylate-based copolymer, ethylene / vinyl laurate / It may be selected from the group consisting of vinyl chloride-based polymers, styrene / butadiene rubber-based polymers and mixtures of two or more of these. The powder resin is included in the range of 5 to 10% by weight, based on the total weight of the mortar composition used in the present invention. It is preferable to use a powder resin of less than 10% by weight in consideration of economical aspects compared to the functionality. Portland Cement, a patented patent by Joseph Aspdin in 1824, is a major hydraulic cement. As a main component, raw materials containing silica, alumina, iron oxide, and lime (usually using limestone, clay or lead quartz, iron ore sinter) are thoroughly mixed in a suitable ratio, and a suitable amount of crushed stone is added to a suitable clinker until some are melted. It is made of powder. Usually, there are Portland cement, crude steel Portland cement, medium heat Portland cement, etc. The Portland cements used in the present invention are usually Portland cements and, more preferably, may have a specific surface area of 3,500 to 4,500 cm 2 / g. The Portland cement is included in the range of 30 to 40 wt% based on the total weight of the mortar composition used in the present invention.

Subsequently, the acrylic eco-friendly crack repair putty material used in the present invention includes (a) 40 to 60% by weight of urethane-acrylate hybrid rubber, 10 to 15% by weight of styrene-butadiene rubber, 20 to 25% by weight of polyolefin, and 10 to 10 fillers. 40 to 50% by weight of a water-soluble acrylic waterproofing agent consisting of 20% by weight; (b) 40 to 45% by weight of modified latex-based moldane; (c) 20 to 80% by weight of an aqueous acrylic resin, 5 to 50% by weight of a filler composed of at least one component selected from aerosol silica, quartz powder, calcium carbonate powder, precipitated silica and diatomaceous earth powder, and 5 to 30% by weight of silicone oil. The thing manufactured by mixing 5-15 weight% of water-soluble acrylic sealants containing is used.

In addition, the crack repair elastic putty material includes 15 to 25% by weight of resin, 0.1 to 1.0% by weight of thickener, 0.3 to 1.0% by weight of dispersant, 0.3 to 1.0% by weight of preservative, and cryoprotectant 0.3 to 1.0 of propylene glycol. It may further include 2 to 5% by weight of a water-soluble functional additive consisting of weight%, 0.1 to 0.5% by weight of antifoaming agent, 0.1 to 0.5% by weight of pH adjuster, 5 to 10% by weight of surfactant, 65 to 75% by weight of diluent solvent.

When looking at the specific components, firstly, the acrylic composition is composed of water-containing urethane-acrylate hybrid and rubber-styrene-butadiene rubber.The water-dispersed polyurethane-hybrid rubber is a water-soluble acrylic-based waterproofing agent. The weight is made up of 48 to 60% by weight, and the styrene-butadiene rubber is made up to include 10 to 12% by weight. The water-dispersed urethane-acrylate hybrid rubber has superior water resistance and low cost compared to a single urethane, and mechanical properties, chemical resistance, durability, and adhesive strength are superior to those of single water-dispersed acrylic. In addition, water-dispersed urethane-acrylate hybrid rubbers are waterproof materials and contain 20% to 40% urethane in the total weight of water-dispersed polyurethane-hybrid rubber and maintain 45% solids and have a viscosity of 1,000 to 1300 cps. And 500% elongation, it is configured to add elasticity. In addition, the above-described styrene-butadiene rubber has high waterproofing properties and high elongation, and when the threshold value is less than the threshold, the elongation and waterproofing properties cannot be expected. On the other hand, the water-soluble acrylic waterproofing agent may further contain a filler, and the filler at this time mixes 9 to 17% by weight. Further, a water-dispersible polyolefin can be further added to the water-soluble acrylic waterproofing agent. The water-dispersed polyolefin is added to improve chemical resistance, non-slip and fillers, and to improve impact resistance and heat resistance, wherein the water-dispersed polyolefin contains 18 to 24% by weight of the total weight of the water-soluble acrylic waterproofing agent. good. Such water-dispersed polyolefins are less likely to expect the above-mentioned effects if they are less than the threshold, and more likely to have more elevated effects if the threshold is exceeded. Accordingly, the water-soluble acrylic waterproofing agent is configured to achieve a predetermined waterproofing effect and elongation rate, and is configured to be included in the above range in order to maintain environmentally friendly adhesion even in a bottle shape.

Next, moldane is commonly used as a cement mortar adhesive, which is a general purpose adhesive that can be mixed with water and applied to both the base coat and the top coat. These mold dynes can be used by selecting one of the main moieties, which is composed of modified latex series, S.B.R + E.V.A series, or acrylic emulsion + inorganic filler series, depending on the intended use. In particular, the molesine described above is usually mixed with water to serve as an adhesive, but in the present invention, it is used to improve elasticity and adhesion without mixing with water. This is because mixing with water is not suitable because most of the components of the present invention are water soluble. In the present invention, a modified latex-based mold dyne is used to improve elasticity and adhesiveness, and the elasticity and adhesiveness as desired as desired are achieved within the above range, and the mold dyne is commercially available in the mold mold MD-2000. "We used mouldin circulated as.

Subsequently, the water-soluble auxiliary adhesive itself has sufficient adhesiveness, but in the present invention, it further increases the adhesion of the mold dyne and simultaneously acts to maintain the adhesion with the concrete structure during freezing and melting. That is, the water-soluble auxiliary adhesive agent is an acrylic resin, a SBR (styrene-butadiene rubber, styrene-butadiene rubber) and an EVA resin (Ethylene vinylene acetate, ethyl vinyl vinyl acetate) mixed at a weight ratio of 1: 3: 2. 25% by weight may be used, thickener 0.1-1.0% by weight, dispersant 0.3-1.0% by weight preservative 0.3-1.0% by weight, antifreeze agent 0.3-1.0% by weight of propylene glycol, antifoam agent 0.1-0.5% by weight, The pH regulator 0.1 to 0.5 weight%, the surfactant 5 to 10 weight%, and the diluent solvent 65 to 75 weight% may be further included. As the "acrylic resin" in the "resin", "copolymerized synthetic resin" such as normal "styrene-acrylic", it contains "40 wt% or more" of solid content. Such acrylic resins are synthesized by co-polymerizing acrylic monomers of 2 to 3 types. Examples of the acrylic monomers include 2-ethylhexyl acrylate (2-EHA), acrylic acid (AA), and acrylic acid (methacrylic acid). , MAA), methyl methacrylate (MMA), etc. are used, and styrene is used as a reinforcing agent to enhance water resistance. S.B.R.resins have a structure with a weight ratio of butadiene to styrene of 75:25, containing 60 to 70% of rubber components. EVA resin is produced by pressurizing ethylene to vinyl acetate at 80 bar to 85 ° C and 50 bar, and the ethylene content is more than 30%.

Such resins contain synthetic rubber components in water-soluble acrylic resins, which are environmentally friendly during construction.They have good elasticity, elongation, and tensile strength, and are particularly susceptible to structural and concrete damage caused by freezing and concrete. It is possible to form waterproofness while preventing the degradation of adhesiveness. When the resin is mixed below the threshold, it is difficult to expect the above-mentioned elasticity, high elongation, tensile strength, and water resistance, and when the threshold is exceeded, the amount of propylene glycol becomes too high, and it is difficult to mix other ingredients.

Next, the thickener is used to impart viscosity to the water-soluble auxiliary adhesive, and mainly hydroxypropyl methyl cellulose (HPMC) of the cellulose system. Cellulose excels in freshwater and absorbs water almost 50 times its own weight. It retains water in a swollen state, giving it excellent workability. However, when used in large quantities, the stickiness is strong, which may cause problems with poor workability.

Dispersants are used to disperse the solids in the composition of water-soluble auxiliary adhesives. In general, dispersants generally use granule-type white powders.

Preservatives may be used such as benzoic acid, silicic acid and formalin. However, formalin should be avoided as much as possible because it is highly human and irritant. Water-soluble auxiliary adhesives use natural materials such as cellulose to improve the thickening and adhesion. Therefore, when the temperature and humidity are high during the summer season, microorganisms can rot and deteriorate, so an appropriate amount of preservatives must be added.

Cryoprotectants are used to prevent freezing at low temperatures. However, in extreme cold temperatures, even if the amount of antifreeze is used a lot, there is no significant effect, so proper warming measures must be taken. Use low molecular weight glycol as a cryoprotectant. Glycols include ethylene glycol (Ethylene glycol), diethylene glycol (Glycol), propylene glycol (Glycol), and glycerin (Glycol).

Antifoaming agents are used to suppress foaming, and may be used for commercially available products such as conventional nonionic O / W emulsions, such as polyether-siloxane copolymers containing hydrophobic silica. Next, the ph regulator is a strong base substance such as ammonium hydroxide, which regulates the acidity (ph) of the entire composition.

Surfactants are used to maintain the colloidal state of copolymers. They use anionic surfactants and sodium dodecyl sulfate.

Water is used as the diluent solvent. Water should be used with caution as the change in viscosity is remarkable even with small amounts of water.

The water-soluble waterproofing aid is blended with the water-soluble acrylic waterproofing agent to improve the water resistance. One component selected from the group consisting of paraffin waxes and other fatty acid esters of alcohols = 4, each of which consists of a hydrophobic plasticizer of 3.5% to 7.5% by weight in a weight ratio of 0.5 to 1%. It is mixed by the weight ratio of. Here, the above-described hardener is a general configuration, and the detailed description of this in the specification is omitted. However, the topic of water-soluble, auxiliary waterproofing agents in the present invention uses epoxy clock resins. Although these epoxy resins have very good adhesion and water resistance, it is essential that the aqueous epoxy watches contain surfactants (emulsifiers) on their own or externally to make them aqueous. However, since these surfactants have a high affinity for water, the water solubility of the epoxy series and the water-repellent of the auxiliary waterproofing agent decreases the water resistance, and in particular, there is a problem in that the moisturizing action is strong. Thus, the water-soluble auxiliary waterproofing agent in the present invention contains a hydrophobic plasticizer to solve the above problems.

Hydrophobic plasticizers include C5-based hydrocarbons, paraffin waxes and fatty acid esters of polyhydric alcohols. The use of these materials is less compatible than when using only aromatic aromatic non-reactive hydrocarbons, but it is more hydrophobic and can improve the water resistance. It will continue to maintain its environmentally friendly advantages while helping to prevent degradation of water resistance, durability and water resistance.

The putty material of the present invention additionally comprises a water-soluble acrylic sealant, wherein the acrylic sealant is configured to impart elasticity and water resistance while filling microcracks of the concrete structure. The water-soluble acrylic sealant is composed of water-based acrylic resin 20 to 80% by weight, aerosol silica, quartz powder, calcium carbonate powder, precipitated silica and diatomaceous earth powder, and is composed of at least one of the following components. It is composed of weight percent.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1 to 3

In order to prevent corrosion of the rebar exposed to the surface of the concrete building, anti-corrosion protection material (A) is applied, and then a high-strength repair mortar (B) is applied to the damaged wall to recover the damaged concrete section due to cracks. Subsequently, the test piece was prepared to fill and repair the elastic putty material (C) in the crack of the concrete wall, to clean up the cracked area, to apply a plaster finish and to apply the elastic waterproof paint to the repaired wall to measure crack repair characteristics. At this time, the composition of the antirust protection material (A) and the elastic putty material (C) used were as follows, and the mortar (B) as a high-strength repair material for cross-sectional recovery is a conventional product commonly used in the industry. The recovery mortar is 50% by weight of silica sand, 15% by weight of blast furnace slag, 25% by weight of Portland cement, 5% by weight of gypsum mixed with anhydrous gypsum and hemihydrate gypsum, small Once the mortar containing 2% by weight, and 3% by weight of resin powder comprising a mixture of ethylene-based polymer and styrene / butadiene rubber-based polymer. On the other hand, the rust protection material (A) used is a cement resin mortar to prevent corrosion of the reinforcement, maintains excellent adhesion with high-strength polymer repair mortar, easy to use as a brush, drying time is 15 ~ 45 minutes It is saved and the adhesion is strong so that it does not peel off from the rebar.

In addition, the rust-preventing material used in the present invention includes at least one of zinc powder, magnesium powder, aluminum powder, silicon powder, titanium powder and zirconium powder, and furthermore, acrylic-silicon copolymer, silicon oxide (SiO 2), oxidation The composition includes a metal oxide powder which is at least one of aluminum (Al 2 O 3), zirconium oxide (ZrO 2), and titanium oxide (TiO 2). Elastic putty material is 45% by weight filler, 205% by weight binder, 2% by weight waterproof agent, 1.5% by weight insulation, 1.5% by weight rust preventive agent, 0.5% by weight foaming agent, and 0.5% by weight light shielding agent, 0.1% by weight weathering agent, 0.2 wt% and a conventional functional additive, wherein the light shielding agent is prepared by containing titanium dioxide and containing a graphite oxide dispersion in an appropriate amount. As the elastic putty material of the comparative agent, a product sold under the product name PMC-CRp which is generally used in the field was used.

Examples 1 to 3 show a slight difference in the composition of the environmentally friendly acrylic elastic putty material used, in Example 1 55% by weight of water-dispersed urethane-acrylate hybrid rubber, 10% by weight of styrene-butadiene rubber, 25% by weight of polyolefin, filler 50% by weight of a water-soluble acrylic waterproofing agent consisting of 10% by weight, (b) 45% by weight of modified latex-based moldin, (c) 70% by weight of an aqueous acrylic resin, aerosol silica, quartz powder, calcium carbonate powder, precipitated silica, diatomaceous earth It is prepared by mixing 20% by weight of the filler consisting of one or more components selected from the powder, 5% by weight of a water-soluble acrylic sealant composed of 10% by weight of silicone oil. Example 2 consisted of 45% by weight of acrylic waterproofing agent, 42% by weight of modified latex-based moldin and 13% by weight of sealant. On the other hand, Example 3 was composed of 40% by weight of the acrylic waterproofing agent, 40% by weight of the modified latex-based moldane, 15% by weight of the acrylic sealant, and 5% by weight of the functional additives.

Subsequently, the physical properties were measured about the obtained test sample, The summary is as follows. According to the Korean Industrial Standard KSM 6518: 2016 test method, the adhesion strength test was carried out at the time of 14 days of age according to the Korean Industrial Standard KSM 6518: 2016 test method. The results were as shown in the table below. The compositions of Examples 1 to 3 increased the adhesion strength according to the increase in the amount of incorporation of the inorganic filler with the modified surface, and it was confirmed that the results were very high compared to the comparative example. Subsequently, the tensile strength test was carried out at the time of 14 days of age, according to the Korean Industrial Standard KSM 6518: 2016 test method, for each of the compositions prepared in Comparative Examples 1 to 3 and Comparative Examples. The results are shown in the table below. As a result of the experiment, as shown in the above table, the compositions of Examples 1 to 3 and Comparative Examples all meet the LH specialized specification quality standards, and the compositions of Examples 1 to 3 increase the tensile strength as the surface increases. Compared with the comparative example, it was confirmed that the results were very high. Next, each of the compositions prepared in Comparative Examples 1 to 3 above was subjected to an elongation test at the time of 7 days of age according to the Korean Industrial Standard KSM test method. The results are shown in the table below. As a result of the experiment, as shown in the above table, it was confirmed that the compositions of Examples 1 to 3, all of the comparative examples, met the LH professional specification quality standards, increased the elongation rate, and showed very high results compared to the comparative examples.

In addition, according to the Korean Industrial Standard KS M 6010 test method, each phase of the composition prepared in Comparative Examples 1 to 3 was subjected to a phase compatibility test at the time of 14 days of age. The results are shown in the table below. In addition, according to the Korean Industrial Standard KS M1010 test method, each composition produced in Comparative Examples 1 to 3 and Comparative Examples was immersed in water for 30 days at the time of 14 days of age to confirm the state of the coating film. The results are shown in the table below. However, the KS M6010 sets the standard for quality after 24 hours of immersion. As a result of the experiment, as shown in the above table, although the composition of Example 1 to 3 was immersed in the water for 30 days, the composition of the comparative example had no abnormalities on the surface, whereas the composition of the comparative example had blisters on the surface at the point of 14 days of age. You could see what happened. Furthermore, in accordance with the Korean Industrial Standard KSM 6518: 2016 Test Method, each composition prepared in Comparative Examples 1 to 3 above was immersed in saturated calcium hydroxide solution for 30 days in accordance with the Korean Industrial Standard KSM 6518: 2016 test method to determine the state of the coating film. Confirmed. The results are shown in the table below. However, in KS M 6010, the quality standard is that there will be no abnormality after 24 hours immersion. As a result of the experiment, as shown in the above table, the compositions of Examples 1 to 3 were immersed in a saturated solution of calcium hydroxide for 30 days, but the composition of the surface of the Comparative Example had no abnormality on the surface, whereas the composition of the Comparative Example was passed on the surface at 14 days of age. The blisters could be confirmed.

Exam Content

Test Methods
Example 1
Example 2
Example 3
Comparative example
Quality standards
(KSM 6010)

Adhesion strength KSM 6518: 2016
(MPa)
147
145
140
5
9 or more
The tensile strength KSM 6518: 2016
(MPa)
157
148
150
90
49 or more
Elongation KSF 3211: 2015
(%)
547
533
478
250
100 or more
Topical suitability
KSM 6010
(MPa)

no problem
no problem
no problem
fitness
Suitable for you
Water resistance
KSM 6010
(MPa)
no problem
no problem
no problem
Swelling
phenomenon

In water for 24 hours
no problem

Alkali resistance
KSM 6010
(MPa)
no problem

no problem
no problem
Swelling
phenomenon

no problem

As described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, all the above-described embodiments are to be understood as illustrative and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention.

Claims (4)

In order to repair the damage and cracks on the concrete wall surface, the step of constructing a high-strength mortar repair material for the section repair to the damaged wall site;
Following cross-sectional recovery using a high-strength repair material, filling an environmentally friendly acrylic elastic putty material into the concrete wall crack site;
Arranging the crack-produced area so that the base surface is moisturized, and slowly adding and mixing powder to the liquid to apply a plaster finish;
And applying an antirust protection material to protect the exposed rebar of the crack or damaged concrete wall,
The mortar repair material is powder resin 5 consisting of 20 to 30% by weight of silica sand, 15 to 20% by weight of blast furnace slag, 4 to 7% by weight of portland cement 30 to 40% by weight of hydrated lime and an ethylene-based polymer and a styrene / butadiene rubber-based polymer. To 10 weight percent;
The eco-friendly acrylic elastic putty material is a water-soluble acrylic waterproofing agent 45 to 40% by weight of urethane-acrylate hybrid rubber, 10 to 15% by weight of styrene-butadiene rubber, 20 to 25% by weight of polyolefin, and 10 to 20% by weight of filler. 50 wt%; (b) 40 to 45% by weight of modified latex moldin; (c) 30 to 40% by weight of an aqueous acrylic resin, 30 to 40% by weight of a filler composed of at least one component selected from fumed silica, quartz powder, calcium carbonate powder, precipitated silica and diatomaceous earth powder, and 5 to 10% by weight of silicone oil. Repairing method of the exterior wall of the apartment using a high viscosity high-elastic putty material, characterized by mixing 5 to 15% by weight of water-soluble acrylic sealant containing.
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