KR101168722B1 - The prevention method of neutralization and deterioration of a concrete structure - Google Patents

Abstract

PURPOSE: A neutralization and deterioration preventing method of concrete construction is provided to prevent penetration of contaminant and to enhance adhesiveness with concrete structure surface. CONSTITUTION: A neutralization and deterioration preventing method of concrete construction comprises the following steps: spreading, solidifying, and drying water-soluble base coat(SSG110) on surface of a concrete structure(SSG100); spreading, solidifying, and drying water-soluble middle coat(SSG120) on surface of the base coat; and spreading, solidifying, and drying water-soluble topcoat(SSG130) on surface of the middle coat. A base material part of the water-soluble base coat comprises bisphenol-A type epoxy resin, self-emulsified modified epoxy resin, water-dispersible epoxy resin, high-class amphiprotic solvent, and water.

Description

The prevention method of neutralization and deterioration of a concrete structure

The present invention relates to a method for neutralizing and deteriorating concrete structures.

Recently, with the development of heavy and chemical industry, the range of use of concrete structures is expanded and the construction of corrosive environment is increased. Therefore, measures to prevent deterioration of concrete structures are required.

In particular, concrete structures in the corrosive environment adjacent to the sea are exposed to salinity and chlorine ions, and the damage caused by salt damage is very serious. Therefore, countermeasures against salt damage are increasingly required when constructing concrete structures such as harbor facilities. .

When a fine crack occurs in the concrete structure, the phenomenon of deterioration of concrete (deterioration phenomenon) is rapidly progressed, and the concrete structure itself cannot be used.

Neutralization of concrete in salt and corrosive environment causes corrosion of concrete in the concrete structure due to corrosion expansion and expansion of reinforcing steel in the concrete structure. Therefore, coastal structures, offshore bridges and coastal roads are expected to be deteriorated due to salt and neutralization. There is a great need for measures to maintain and improve the durability of concrete structures such as tunnels and tunnels.

Conventional techniques for preventing salt, neutralization and deterioration of concrete structures are mainly applied by applying materials composed of polymers such as aqueous acrylic, EVA, SBR, and various additives such as cement powder and silica and silane compounds. It is the construction methods.

However, these properties are only complementary to those of cement mortar, and they are inadequate to cope with harsh corrosive environments such as acid rain, polluted atmosphere, carbon dioxide, sulfurous acid gas, and salt sea, and new methods using breakthrough materials are urgently needed. have.

Accordingly, Korean Patent No. 68243 is a method for preventing concrete deterioration, and by using a high-quality positive solvent for the coating material, the middle coating material and the top coating material, the water-soluble coating material, the middle coating material, and the top coating material are used to prevent the environmental degradation of the concrete. However, there was a limit to completely prevent deterioration of the concrete structure.

The present invention is to form a structure of the coating layer formed on the surface of the concrete structure as a functional penetration prevention adhesive structure instead of a simple adhesive structure, to improve the adhesion performance with the surface of the concrete structure, and to contaminate contaminants such as salt water from the outside It is intended to provide a method for preventing the deterioration of concrete structures by effectively preventing them.

In addition, the deterioration of concrete structures is greatly influenced by cracks and damages on the concrete surface. Therefore, the method of preventing the deterioration of concrete structures by specifying the method of repairing and adjusting the surface for uniformity and damage of the concrete surface. Is to provide.

Neutralization and deterioration prevention method of the concrete structure of the present invention is a main portion containing a bisphenol-A epoxy resin, a self-emulsifying modified epoxy resin, a water-dispersible epoxy resin, a high-quality solvent and water, modified aliphatic polyamine resin, aromatic 3 A first step of applying a water-soluble undercoat material including a hardening agent part including a higher amine resin, a high positive solvent and water onto the surface of the concrete structure, and then curing and drying the water-based material; A main part comprising a bisphenol-A type epoxy resin, a self-emulsifying modified epoxy resin, a high positive solvent and water, a self-emulsifying modified aliphatic polyamine resin, an aromatic tertiary amine resin, magnesium silicate, titanium dioxide, aluminum metal powder, A second step of applying a water-soluble middle material including a hardening agent part including a high positive solvent and water onto a surface on which the water-soluble lower material is cured and dried; The intermediate material cures and dries a water-soluble top material comprising a main portion comprising an aqueous silicone acrylic resin or an aqueous polyurethane resin, titanium dioxide, magnesium silicate, additives and water, and a curing agent portion including a polyisocyanate resin and a high-quality positive solvent. It is characterized in that it comprises a third step of applying a hardened surface and then curing and drying.

Here, in the second step, the aluminum metal powder contained in the curing agent of the water-soluble intermediate material has a thickness of 1 μm or less, a long axis length of 50 μm or more, and a short axis length of 10 μm or less, wherein the aluminum metal powder is silica. It is preferable to coat with. Moreover, it is preferable that the said aluminum metal powder is previously mixed with the solvent in the density | concentration of 65 to 75 weight%, Here, it is more preferable that the said solvent is a high positive solvent.

In the first step, the water-soluble base material is a bisphenol-A epoxy resin 9.5-30% by weight, 15-40% by weight of the self-emulsifying modified epoxy resin, 15-40% by weight of the water-dispersible epoxy resin, high-quality positive solvent 2 to 10% by weight and 20 to 55% by weight of water, 20 to 55% by weight of modified aliphatic polyamine resin, 4.5 to 15% by weight of aromatic tertiary amine resin, 2 to 10% by weight of high-quality solvent, and water It includes 30 to 60% by weight, it is preferable to include the main portion and the curing agent portion in a weight ratio of 1: 4 to 4: 1,

In the second step, the water-soluble intermediate material is a bisphenol-A epoxy resin of 15 to 45% by weight, 35 to 65% by weight of the self-emulsifying modified epoxy resin, 5 to 25% by weight of the high-quality positive solvent and 5 to water as the main portion 20 wt%, 10-30 wt% of self-emulsified modified aliphatic polyamine resin, 0.5-2.6 wt% of aromatic tertiary amine resin, 15-30 wt% of magnesium silicate, 5-20 wt% of titanium dioxide, 5 to 20% by weight of aluminum metal powder, 5 to 10% by weight of high-quality positive solvent, and 20 to 45% by weight of water, and preferably include the main portion and the curing agent in a weight ratio of 1: 4 to 4: 1. ,

In the third step, the water-soluble top material is 30 to 60% by weight of aqueous silicone acrylic resin or aqueous polyurethane resin, 15 to 30% by weight of titanium dioxide, 15 to 30% by weight of magnesium silicate and 7.9 to 30% by weight of water as the main part. It includes, and comprises 30 to 70% by weight of polyisocyanate resin and 30 to 70% by weight of the high-quality positive solvent as a curing agent portion, it is preferable to include the main portion and the curing agent portion in a weight ratio of 10: 1 to 1:10. Do.

In addition, in the first step, the main portion and the curing agent portion of the water-soluble primer, the second portion of the water-soluble intermediate material in the main portion and the curing agent portion, the higher positive solvent contained in the curing agent portion in the third step are the same or different , At least one selected from the group consisting of ether solvents, ester solvents and alcohols, the ether solvent is butyl cellosolve or ethyl cellosolve, and the ester solvent is butyl acetate, cellosolve acetate Or methyl acetate, and the alcohol may be ethyl alcohol, isopropyl alcohol or butyl alcohol.

The present invention is to form a structure of the coating layer formed on the surface of the concrete structure as a functional penetration prevention adhesive structure instead of a simple adhesive structure, to improve the adhesion performance with the surface of the concrete structure, and to contaminate contaminants such as salt water from the outside By effectively preventing this, a method of preventing deterioration of the concrete structure was provided.

In addition, the deterioration of concrete structures is greatly influenced by cracks and damages on the concrete surface. Therefore, the method of preventing the deterioration of concrete structures by specifying the method of repairing and adjusting the surface for uniformity and damage of the concrete surface. Provided.

1 is a process conceptual view of the deterioration prevention method of the concrete structure of the present invention,
2 is a cross-sectional conceptual view of a concrete structure by the neutralization and deterioration prevention method of the concrete structure of the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described a specific embodiment of the present invention.

First, since the deterioration performance of the concrete structure is largely dependent on the treatment state of the concrete surface, prior to applying the neutralization and deterioration prevention method of the concrete structure of the present invention, as shown in the process conceptual diagram of FIG. Carry out a surface treatment process to remove debris (moisture, oil, and other contaminants). When the surface treatment process is carried out by reinforcement construction of deteriorated concrete structures, it is treated with high-pressure water, dried, and then surface treated.

Next, as a first step of the neutralization and deterioration prevention method of the concrete structure of the present invention, the undercoat material is applied to the surface of the surface-treated concrete structure, and then cured and dried.

Here, the undercoat material includes a bisphenol-A epoxy resin, a self-emulsifying modified epoxy resin, a water-dispersible epoxy resin, a high-quality positive solvent and a water-containing main portion, a modified aliphatic polyamine resin, an aromatic tertiary amine resin, a high-quality positive solvent, A water-soluble undercoat comprising a curing agent portion comprising water, and more preferably, as a main portion, 9.5-30 wt% of bisphenol-A type epoxy resin, 15-40 wt% of self-emulsifying modified epoxy resin, and 15 water-dispersible epoxy resin. ~ 40% by weight, 2-10% by weight of the high-quality positive solvent and 20-55% by weight of water, 20-55% by weight of modified aliphatic polyamine resin, 4.5-15% by weight of aromatic tertiary amine resin, as a curing agent It contains 2 to 10% by weight of solvent and 30 to 60% by weight of water, and may include the main portion and the curing agent portion in a weight ratio of 1: 4 to 4: 1.

It is preferable that the epoxy resin contained in the main part of the undercoat material of the present invention has an epoxy equivalent of 180 to 205, the epoxy equivalent of the self-emulsifying modified epoxy resin is preferably 200 to 220, and the epoxy equivalent of the water-dispersible epoxy resin is It is preferable that it is 450-550. Moreover, it is preferable that the modified aliphatic polyamine resin contained in a hardening | curing agent part is 190-240, and it is preferable that aromatic tertiary amine resin is 620-650.

In this process, the base material and the curing agent are mixed at a predetermined mixing ratio, and then the mixed material is applied to the surface of the surface-treated concrete so that a corner portion or a corner portion is sufficiently absorbed with a brush first, and then a large area is Use rollers or sprays to spread the film sufficiently over the entire surface of the concrete. At this time, it is preferable to use all the mixed materials within a normal pot life time of about 1 hour at a temperature of 20 ± 5 ℃. This is because a material whose pot life has elapsed has a high possibility of deteriorating its physical properties. Thus, after apply | coating a base material, it fully hardens and drys for about 8 hours or more.

The undercoating material of the present invention serves as a permeability-adjusting material, and when the two liquid components of the main part and the curing agent part are mixed, the water-soluble material becomes an alkaline water-soluble epoxy polymer state of pH 10-12 in a milky white liquid state, and is in a standard state and a wet state. It shows excellent permeability to the concrete surface, and the infiltrated undercoat reinforces the concrete surface and improves safety and workability by eliminating hazards and fire hazards caused by organic solvents. In addition, since the pH is 10 to 12 alkalinity, as well as chemical stability to the alkaline concrete surface of pH 13 as well as affinity with the concrete surface is maximized, there is an effect of exhibiting a strong adhesion with the concrete surface. In addition, the undercoat material of the present invention absorbs cement powder, dust, and the like on the concrete surface so that the intermediate material, which is the material of the concrete ground adjustment work, which is the next process, can exert a strong adhesive force on the concrete surface.

After carrying out the process of treating the undercoat material, before the intermediate material treatment, the surface of the cracked, damaged or uneven parts of the surface may be filled and repaired using a filling repairing material, and then the surface may be smoothly adjusted. At this time, the filling and repair work used is to install the base on the cracked part, and to inject the epoxy resin through the special injector (SSG-EP method), and to prevent the reinforcing bar on the damaged part and to use the polymer cement mortar A method of restoring (SSG-PCM method) may be used, and the uneven portion may be adjusted by a grinder, or a surface may be adjusted by using an epoxy putty (SSG-PU method).

Next, as a second step of the neutralization and deterioration prevention method of the concrete structure of the present invention, the intermediate material is cured and dried after applying the water-soluble undercoating material to the surface cured and dried.

Here, the intermediate material includes a main part including a bisphenol-A type epoxy resin, a self-emulsifying modified epoxy resin, a high positive solvent and water, a self-emulsifying modified aliphatic polyamine resin, an aromatic tertiary amine, magnesium silicate, titanium dioxide, As a water-soluble intermediate containing a hardening agent part containing an aluminum metal powder, a high positive solvent and water, More preferably, 15-45 weight% of bisphenol-A type epoxy resin and 35-65 weight of self-emulsification modified epoxy resin as a main part %, 5-25 wt% of the high-quality positive solvent, and 5-20 wt% of water, and as a curing agent, 10-30 wt% of the self-emulsified modified aliphatic polyamine resin, 0.5-2.6 wt% of the aromatic tertiary amine, and magnesium silicate 15 30 wt%, titanium dioxide 5-20 wt%, aluminum metal powder 5-20 wt%, high positive solvent 5-10 wt% and water 20-45 wt%, the main portion and the curing agent portion 1: 4 ~ To be included in a weight ratio of 4: 1 Can be.

It is preferable that epoxy equivalent of bisphenol-A type epoxy resin contained in the main part of the intermediate material of this invention is 180-205, and epoxy equivalent of self-emulsifying modified epoxy resin is 200-220. Moreover, it is preferable that the modified aliphatic polyamine resin contained in a hardening | curing agent part is 190-240, and it is preferable that aromatic tertiary amine resin is 620-650.

According to the present invention, after performing the permeability possession adjustment through the first step of the subcontracting material processing step, the background adjustment work is performed as an intermediate process by using the intermediate material as the background adjustment material. First, the main material and the curing agent of the intermediate material are stirred through the electric mixer, and then the mixing agent is sufficiently mixed and stirred by a mechanical method such as an electric mixer while the curing agent is added to the stirred main ingredient at the designated mixing ratio, and then the brush and the roller ( Roller), spray (spray), etc. to apply the work, it is preferable to apply the corners or corners first with a brush, and then apply a wide enough surface as a whole using a roller or a spray. At this time, it is preferable that the mixed intermediate material is at a pot life of about 1 hour or less at 20 ± 5 ° C., and after all the intermediate materials have been applied, curing and drying are preferably performed for about 8 hours or more.

The intermediate material of the present invention uses a water-soluble epoxy resin, unlike an oily base material or putty material, which is composed of an organic solvent used in a conventional method, and has an aluminum metal powder thickness of 1 μm or less and a long axis length of 50 μm. The above is characterized by including the piece-shaped aluminum metal powder and ceramic whose short axis length is 10 micrometers or less.

As described above, the intermediate material of the present invention is a two-liquid water-soluble material composed of a main portion and a hardener portion, and when the two-liquid components are mixed, the mixed material becomes a silver gray liquid water-soluble material, and exhibits excellent affinity with the concrete surface. To ensure stable adhesion. In addition, although the conventional method generally uses a spherical pigment, the aluminum metal powder of the present invention has a flat structure, and each aluminum metal powder takes a dense and complicated layer structure in the state of deep penetration into the coating layer. By forming a non-leafing type, not only the effect of blocking the inflow of water or air that penetrates into the coating layer is excellent, but also excellent adhesion between the preformed underlay layer and the overlaid layer to be performed later. You can do it.

In addition, the flaky aluminum metal layer included in the intermediate material to form a non-ripping structure can reflect sunlight, and also ensure a heat insulating effect.

The aluminum metal powder contained in the intermediate material of the present invention is coated with silica on the surface thereof, so that when the aluminum metal powder is used, workability can be further improved in water solubility. In addition, the aluminum metal powder of the present invention is previously wetted in the solvent at a concentration of about 65 to 75% by weight, thereby preventing scattering of the aluminum metal powder during work, and when the aluminum metal powder is mixed with other compositions, flaky aluminum metal. It is possible to prevent the minute from being destroyed. Herein, a solvent for pre-wetting the aluminum metal powder may use a high-quality positive solvent.

Next, as a third step of the neutralization and deterioration prevention method of the concrete structure of the present invention, the top coat is cured and dried after applying the water-soluble intermediate to the surface cured, dried.

Here, the top coat is a water-soluble top coat including a main portion comprising an aqueous silicone acrylic resin or an aqueous polyurethane resin, titanium dioxide, magnesium silicate, additives, and water, and a curing agent portion including a polyisocyanate resin and a higher positive solvent. Preferably it contains 30-60 weight% of aqueous silicone acrylic resin or aqueous polyurethane resin, 15-30 weight% of titanium dioxide, 15-30 weight% of magnesium silicates, and 7.9-30 weight% of water as a main part, As a hardening | curing agent part, 30 to 70% by weight of the polyisocyanate resin and 30 to 70% by weight of the high positive solvent, and may include the main portion and the curing agent portion in a weight ratio of 10: 1 to 1:10.

According to the present invention, after performing the background adjustment work through the second step of the intermediate material treatment step, the main material of the top material is stirred through the electric mixer, and then, the hardener is added to the stirred material at a specified compounding ratio by a mechanical method such as an electric mixer. After mixing and stirring sufficiently, apply the paint work using brush, roller, spray, etc. to the surface where the middle material is treated. It is preferable to apply | coat whole fully using a spray. At this time, it is preferable that the mixed top coating material has a pot life of about 2 hours or less at 20 ± 5 ° C., and after curing all of the top coating materials, it is preferable to cure and dry for at least about 8 hours. At this time, the top coat treatment can be carried out by repeating the top coat treatment process one or more times, depending on the environmental conditions, such as the state of the concrete structure, the installation place to be installed.

The finishing material of the present invention is a water-soluble, high-performance paint mainly composed of a water-free silicone acrylic resin or a water-soluble polyurethane resin, and has excellent performance as an oil-based acrylic urethane resin paint using an organic solvent. While maintaining, it is manufactured to be water-soluble, so that the hazards and fire hazards caused by organic solvents can be eliminated during operation, resulting in excellent stability and workability.

In the first step of the present invention, the main portion and the curing agent portion of the water-soluble primer, in the second step of the main portion and the curing agent portion of the water-soluble intermediate material, the higher positive solvent contained in the curing agent portion in the third step is the same or Alternatively, at least one selected from the group consisting of an ether solvent, an ester solvent, and an alcohol solvent is preferable, and the ether solvent is butyl cellosolve or ethyl cellosolve, and the ester solvent is butyl acetate, Cellosolve acetate or methyl acetate, and the alcohol solvent may be ethyl alcohol, isopropyl alcohol or butyl alcohol.

In addition, the coating material, the intermediate material, the top coating material of the present invention may include a functional additive, if necessary, such as pigments, antifoaming agents, antisettling agents, fillers, dispersants, stabilizers and the like.

The deterioration prevention method of the concrete structure of the present invention as described above is carried out by performing the coating material treatment as the first step, the intermediate material treatment as the second step and the top coating material treatment as the third step, the operation is completed After about 7 days of curing drying curing all performance and function is normalized to achieve the effect of preventing the deterioration of the concrete structure.

Hereinafter, the present invention will be described in more detail with reference to specific examples of the present invention.

<Intermediate Example 1 and Comparative Example 1 of the present invention>

First, the intermediate material Example 1 containing the aluminum metal powder of this invention and the comparative example 1 which does not contain it are compared.

-Preparation of Test Piece of Intermediate Example 1 of the Present Invention

The components and contents of Intermediate Example 1 of the present invention were as shown in Table 1 below.

First, after the main ingredient 1 is added to the container for the production of the main ingredient, the ingredients 2 and 3 are added and uniformly mixed with low-speed stirring at about 500 to 900 RPM, and then the main ingredients 4, 5, and 6 are added to prepare a homogeneous liquid. It was. At this time, the color was a light yellow solution as an intermediate test item, the viscosity was 65 ± 5 KU (25 ℃), specific gravity 1.00 ± 0.05 (25 ℃).

Next, in order to prepare a curing agent, the curing agent component 1 was added to a container, and then the stirring agent was added slowly in a small amount while stirring at a low speed, and then stirred for about 10 minutes at a high speed (1500 to 2000 RPM) to obtain a uniform gel. While stirring the solution at low speed, the curing agent components 3 to 9 were added and mixed in order to prepare a homogeneous liquid.Then, while curing the solution at low speed and adding the curing agent components 10 and 11, the mixture was dispersed at high speed for about 30 minutes and the particle size was 6 or more and the viscosity was 120 ±. A homogeneous liquid phase was made at 10 KU (25 ° C). In a separate container, the curing agent component 12 is pre-wet mixed with the curing agent components 13 and 14 in a separate container, and then added to the solution while stirring at low speed, and then uniformly dispersed while stirring at a medium speed (1000 to 1500 RPM) for about 20 minutes. The color was pale silver gray, with a viscosity of 110 ± 10 KU (25 ° C.) and a specific gravity of 1.32 ± 0.05.

The curative mixture was then mixed with the main mixture in a weight ratio of 1: 4.

The mixture thus prepared is applied to a clean flat glass plate (150 * 75 * 1mm) using an applicator to adjust the thickness of the wet coating of the coating material to about 0.060mm, and then at room temperature (about 20 ± 5 ° C). It dried for several days and produced many things by making into a test piece the thing apply | coated with paraffin wax around the test piece.

-Test piece preparation of Comparative Example 1

Except for prewetting and mixing the hardener components 12, 13, and 14 in preparing the test piece of Intermediate Example 1 of the present invention, a plurality of test pieces were prepared in the same manner as the test piece preparation of Intermediate Example 1 of the present invention. .

-Alkali resistance test

Two-thirds of the specimens were immersed in saturated aqueous calcium hydroxide (Ca (OH) ₂ ) solution for 168 hours, then washed in running water, left at an angle for 2 hours in the room, and then irradiated with a coating film. Well, there should be no peeling, and if the difference between the color and gloss of the immersed part and the immersed part is not large, it is determined that there is no abnormality in the alkali resistance test, and the results are shown in Table 2.

That is, as shown in Table 2, Comparative Example 1 containing no aluminum metal powder had a small swelling of about 5% in the coating film, but Intermediate Example 1 of the present invention did not occur such a phenomenon, It can be seen that the intermediate material is excellent in alkali resistance.

-Salt water resistance test

Two-thirds of the specimens were immersed in a 3% aqueous solution of sodium chloride (NaCl) for 168 hours, then washed in running water, left at an angle for 2 hours in the room, and then irradiated with a coating film. If the difference between the color and gloss of the immersed part and the immersed part is not large, it is determined that there is no abnormality in the alkali resistance test, and the results are shown in Table 3.

That is, as shown in Table 3, Comparative Example 1 containing no aluminum metal powder had a small swelling of about 3% in the coating film, but Intermediate Example 1 of the present invention did not occur such a phenomenon, It can be seen that the intermediate material has excellent salt water resistance.

-Water resistance test

Two-thirds of the specimens are immersed in water for 168 hours, then taken out and washed in running water. At this time, there should be no wrinkles, swelling, or peeling of the coating film, and if the difference between the color and gloss of the immersed part and the non-immersed part is not large, the water resistance test should be abnormal.

That is, as shown in Table 4, Comparative Example 1 containing no aluminum metal powder had a small swelling of about 3% in the coating film, but Intermediate Example 1 of the present invention did not occur such a phenomenon, It can be seen that the intermediate material is excellent in water resistance.

-Moisture resistance test

The test piece was placed in a constant temperature and humidity chamber maintained at a temperature of 50 ± 1 ° C. and a humidity of 95% or higher, and the test piece was taken out after 24 hours, and the coating film was immediately irradiated. At this time, the coating film had no wrinkles, cracks, swelling, or peeling, so that the moisture resistance was not abnormal.

That is, as shown in Table 5, Comparative Example 1 containing no aluminum metal powder had a small swelling of about 5% in the coating film, but Intermediate Example 1 of the present invention did not occur such a phenomenon, It can be seen that the intermediate material is excellent in moisture resistance.

<Example 2 and Comparative Example 2 of the deterioration method of the concrete structure of the present invention>

Next, in the deterioration method of the concrete structure of the present invention, it is compared with Example 2 and Comparative Example 2 to which all of the coating material, intermediate material and top coating material are applied.

-Preparation of the test specimen of Example 2 of the deterioration method of the concrete structure of the present invention

The components and contents of the undercoat and the topcoat of Example 2 of the deterioration method of the concrete structure of the present invention are as shown in Table 6 and Table 7, and the components and content of the intermediate were as shown in Table 1.

First, the production of the test base plate is as follows.

The test base is made of molds in which cement, standard sand, and water are mixed in a weight ratio of 1: 3: 0.5 to suit the dimensions of each test (neutralization test: 100mm * 100mm * 100mm, hot / cold resistance test, alkali resistance test and Salt-water resistance test: 70mm * 70mm * 20mm) was molded and cured for about 48 hours at a temperature of 20 ± 2 ℃, relative humidity of 90% or more, then demolded and cured in water at 20 ± 2 ℃ for 5 days, After curing for 7 days or more at 65 ± 20% relative humidity and 20 ± 2 ° C., a plurality of fabrics were prepared to be used for each test by polishing and cleaning the bottom surface when the mortar was chopped using 150 times abrasive paper.

Next, after preparing the main component 1 in the container for the production of the main material of the coating material, the medium component 2 was added in small portions while stirring at medium speed at a speed of about 1000 to 1500 rpm to continue the medium speed for about 20 minutes to form a uniform viscous solution. Stirred. Then, the main components 3 to 7 were added sequentially while the solution was stirred at low speed, and then prepared as a uniform solution while stirring at medium speed for about 20 minutes. At this time, the color was a pale yellow solution as an intermediate test item, and the viscosity was 60 ± 5 KU (25 ° C), specific gravity 1.00 ± 0.05 (25 ° C).

Next, in order to prepare the curing agent, the curing agent component 1 was added to a container, and then the curing agent component 2 was added and mixed while stirring at low speed, and then the curing agent components 3 and 4 were added and mixed in order to prepare a uniform solution. The color was transparent and the specific gravity was 1.00 ± 0.05.

The main mixture and the curing agent mixture were mixed in a weight ratio of 1: 1.

The intermediate material was prepared in the same manner as in Example 1.

Next, in order to prepare the main material of the top coating material, after introducing the main component 1 into the A container, the main components 2 to 4 are uniformly mixed in order while stirring at low speed. Then, the main component 5 is added to a separate B container, and the medium component is stirred at about 20 times so as to uniformly disperse by adding a small amount of the main component 6 while stirring at medium speed. While mixing the mixture premixed in the container A with medium speed stirring, the mixture premixed in the B container is added and mixed, and then main components 7 and 8 are added to disperse rapidly for about 20 minutes to sufficiently disperse the mixture. Subsequently, the main components 9 to 11 were added and mixed in order while the solution was stirred at medium speed, and stirred at a medium speed for about 20 minutes to prepare a uniform liquid phase. At this time, the color of the intermediate test items were white, the viscosity was 85 ± 5 KU (25 ℃), specific gravity 1.30 ± 0.05 (25 ℃), the particle size (NS) was 6.0 or more.

Next, in order to prepare a curing agent, the curing agent component 1 was added to a container, and then the mixing agent was added and mixed at low speed to prepare a uniform solution. The color was a transparent liquid and the specific gravity was 0.86 ± 0.05 as an intermediate test item. .

The main mixture and the curing agent mixture were then mixed in a weight ratio of 7: 1.

After applying the primer and the intermediate and the top coating, the coating of the primer was applied to the surface of the test base plate prepared in advance so that the wet coating thickness was 30 ± 5 μm and cured and dried at a temperature of 20 ± 5 ° C. for 8 hours. After the ash is applied to the surface of the coated undercoat with a brush coating so that the wet coating thickness is 60 ± 10 μm and cured and dried at a temperature of 20 ± 5 ° C. for 8 hours, the topcoat is wet with a paint coating on the surface of the coated intermediate material. The coating was applied to a thickness of 60 ± 10 ㎛ and cured and dried for 7 days at a temperature of 20 ± 5 ℃ to prepare a plurality of test bodies each formed of the coating material and the intermediate material and top coating material of the present invention as a coating film.

-Preparation of test specimen of Comparative Example 2

A large number of test bodies were prepared in the same manner as in Example 2, except that the content and the content of the intermediate material used in the test piece preparation of Comparative Example 1 were used.

-Preparation of test bodies of Example 3 and Comparative Example 3

After fabricating the coating material, intermediate material and top coating material in order as in Example 2 and Comparative Example 2, and then, for each accelerated test (severe test), draw a straight line in X shape to the coating film of the underlying material with a knife on the surface of each coating film. The test bodies of Example 3 and Comparative Example 3 were produced.

-Neutralization test

The reference test body (test plate without coating the middle material, the middle material and the top coat), the test body of Example 2 of the present invention and the test body of Comparative Example 2 were exposed to the neutralization tester, and the exposure conditions were 20 ± 2 ° C., relative Humidity was 65 ± 10%, carbon dioxide concentration was 5%, and the exposure time was 28 days, after which the test piece was taken out, the cross section was cut off, and the part discolored in red was sprayed with 1% phenolphthalein alcohol solution on the cut surface. The unchanged portion was determined as the neutralization portion, and the average length from the exposed surface to the neutralization interface was measured and defined as the neutralization depth. The results are shown in Table 8.

That is, as shown in Table 5, the reference specimen shows that carbon dioxide penetrates into the concrete and neutralizes with an average of 20.4 mm. In Example 2 and Comparative Example 2 of the present invention, carbonization does not penetrate and neutralization proceeds. It can be seen that it is not.

-Resistance test by hot and cold repeated action

The specimen was immersed in water at a temperature of 20 ± 2 ° C. for 18 hours, then taken out and immediately immersed in a thermostat at −20 ± 3 ° C., cooled for 3 hours, and then heated for 3 hours in another thermostat at 50 ± 3 ° C. After repeating the above operation 10 times with a cycle, it was left for 2 hours in a laboratory maintained at 20 ± 5 ° C., and visually inspected for peeling, cracking, and swelling on the surface of the coating film of the test body, and the adhesion strength as described above. It was measured before and after the hot and cold repeated test was not performed, and the results are shown in Table 9 below.

That is, as shown in Table 8, Comparative Example 2 using the intermediate material containing no aluminum metal powder, but the adhesive strength after the test is lower than 0.4 before the test, Example of applying all of the coating material, intermediate material and top coating material of the present invention 2, peeling, cracking, swelling, etc. of the surface after the test did not occur, and the adhesion strength after the test was reduced only 0.1 compared with before the test, it can be seen that the resistance to hot and cold repeated Hung.

In addition, in the case of Example 3 for the harsh conditions experiment, the swelling occurred about 1.5mm from the boundary line after the test, but in the case of Comparative Example 3 occurred about 3.5mm, in the case of the embodiment of the present invention included in the intermediate material It can be seen that the penetration of water can be prevented by the hot metal repeated action by the aluminum metal powder on the phase.

-Alkali resistance test

After immersing the test body completely in a saturated aqueous solution of calcium hydroxide (Ca (OH) 2) for 240 hours, it was taken out, washed in running water and wiped dry, and left in the room for 3 hours, and then irradiated with a coating film. Visual inspection of the occurrence of component rims was made, and the bond strength was measured before and after the test. The results are shown in Table 10.

That is, as shown in Table 9, Comparative Example 2 using the intermediate material containing no aluminum metal powder, but after the test, the adhesive strength is lower than 0.2 before the test, an example in which all of the coating material, intermediate material and top coating material of the present invention is applied 2, peeling, cracking, swelling, etc. of the surface after the test did not occur, and the adhesive strength after the test did not decrease as compared with the test.

In addition, in the case of Example 3 for the harsh conditions experiment, the swelling occurred about 1.0mm from the boundary line after the test, but in the case of Comparative Example 3 occurred about 2.5mm, in the case of the embodiment of the present invention included in the intermediate material It can be seen that infiltration of alkaline water can be prevented by the aluminum metal powder on the phase.

-Salt water resistance test

The specimen was immersed in a 3% aqueous solution of sodium chloride (NaCl) for 240 hours, then taken out and washed in running water, left standing at an angle for 3 hours indoors, and then irradiated with a coating film. The bond strength was measured before and after the test, and the results are shown in Table 11.

That is, as shown in Table 10, Comparative Example 2 using the intermediate material containing no aluminum metal powder 0.3 after the test, the adhesive strength was lower than before the test, an example in which all of the coating material, intermediate material and top coating material of the present invention is applied 2, peeling, cracking, swelling, etc. of the surface after the test did not occur, and the adhesive strength after the test did not decrease as compared with the test.

In addition, in the case of Example 3 for the harsh conditions experiment, the swelling occurred about 1.0mm from the boundary line after the test, but in the case of Comparative Example 3 occurred about 2.5mm, in the case of the embodiment of the present invention included in the intermediate material It can be seen that infiltration of alkaline water can be prevented by the aluminum metal powder on the phase.

According to the neutralizing and deterioration prevention method of concrete structure using the eco-friendly water-soluble epoxy paint of the present invention and the waterproof barrier film of flake structure, since it uses a water-soluble paint that does not use organic solvents, It is possible to prevent risks, environmental pollution, etc., to work on wet surfaces, and to protect concrete structures and extend the life of the concrete structure by waterproofing the barrier film containing aluminum metal powder in the middle of the intermediate process. Durability, waterproof, adhesiveness, corrosion resistance, thermal insulation and excellent resistance to the external environment is greatly improved.

SSG100: Concrete Structure
SSG110: Underground Materials
SSG120: Middle layer, SSG121: Aluminum metal powder
SSG130: Top layer

Claims (8)

A main part comprising a bisphenol-A epoxy resin, a self-emulsifying modified epoxy resin, a water-dispersible epoxy resin, a high-quality positive solvent and water,
A first step of applying a water-soluble base material comprising a modified aliphatic polyamine resin, an aromatic tertiary amine resin, a high positive solvent and a hardener portion including water to the surface of the concrete structure, followed by curing and drying;
A main part comprising a bisphenol-A type epoxy resin, a self-emulsifying modified epoxy resin, a high positive solvent and water,
A water-soluble intermediate material comprising a self-emulsified modified aliphatic polyamine resin, an aromatic tertiary amine, magnesium silicate, titanium dioxide, an aluminum metal powder, a high-quality positive solvent and a water-hardening agent portion is applied to a surface on which the water-soluble base material is cured and dried. A second step of curing and drying;
A main portion comprising an aqueous silicone acrylic resin or an aqueous polyurethane resin, titanium dioxide, magnesium silicate, additives and water,
And a third step of applying the water-soluble top coating material including a curing agent part including a polyisocyanate resin and a high positive solvent to a surface on which the intermediate material is cured and dried, followed by curing and drying.
In the first step, the main portion and the curing agent portion of the water-soluble primer, the second portion of the main portion and the curing agent portion of the water-soluble intermediate material, the higher positive solvent contained in the curing agent portion in the third step is the same or different, ether Neutralization and deterioration prevention method of a concrete structure, characterized in that at least one selected from the group consisting of solvents, ester solvents, alcohols. The method of claim 1, wherein the aluminum metal powder contained in the curing agent of the water-soluble intermediate in the second step of the concrete structure, characterized in that the thickness of less than 1㎛, the long axis length is more than 50㎛, the short axis length is less than 10㎛ Neutralization and deterioration prevention method. The method of claim 2, wherein the aluminum metal powder is coated with silica. The method of claim 2, wherein the aluminum metal powder is pre-mixed with a solvent in a concentration of 65 to 75% by weight. The method of claim 4, wherein the solvent is a high positive solvent. According to claim 1, wherein in the first step, the water-soluble base material is a bisphenol-A type epoxy resin 9.5-30% by weight, 15-40% by weight of the self-emulsifying modified epoxy resin, 15-40 water-dispersible epoxy resin as the main part Wt%, high positive solvent 2-10 wt% and water 20-55 wt%,
As the curing agent, 20 to 55% by weight of modified aliphatic polyamine resin, 4.5 to 15% by weight of aromatic tertiary amine resin, 2 to 10% by weight of high-quality positive solvent and 30 to 60% by weight of water,
The main portion and the hardener portion in a weight ratio of 1: 4 to 4: 1;
In the second step, the water-soluble intermediate material is a bisphenol-A epoxy resin of 15 to 45% by weight, 35 to 65% by weight of the self-emulsifying modified epoxy resin, 5 to 25% by weight of the high-quality positive solvent and 5 to water as the main portion Containing 20% by weight,
10 to 30% by weight of self-emulsified modified aliphatic polyamine resin, 0.5 to 2.6% by weight of aromatic tertiary amine, 15 to 30% by weight of magnesium silicate, 5 to 20% by weight of titanium dioxide, 5 to 20% by weight of aluminum metal, 5 to 10% by weight of the high-quality positive solvent and 20 to 45% by weight of water,
The main portion and the hardener portion in a weight ratio of 1: 4 to 4: 1;
In the third step, the water-soluble top material is 30 to 60% by weight of aqueous silicone acrylic resin or aqueous polyurethane resin, 15 to 30% by weight of titanium dioxide, 15 to 30% by weight of magnesium silicate and 7.9 to 30% by weight of water as the main part. Including,
As the hardener, it contains 30 to 70% by weight of polyisocyanate resin and 30 to 70% by weight of high-quality positive solvent,
Neutralization and deterioration prevention method of the concrete structure, characterized in that the main portion and the hardener portion in a weight ratio of 10: 1 ~ 1:10. delete The method of claim 1, wherein the ether solvent is butyl cellosolve or ethyl cellosolve, the ester solvent is butyl acetate, cellosolve acetate or methyl acetate, the alcohol is ethyl alcohol, isopropyl alcohol or butyl Neutralization and deterioration prevention method of the concrete structure, characterized in that the alcohol.

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