KR102073932B1 - Durability improvement method of steel structure or concrete structure - Google Patents

Abstract

The present invention relates to a method of improving durability of a steel structure or a concrete structure, which includes: a step (S10) of arranging a coated surface of the steel structure or the concrete structure; and a step (S20) of coating the coated surface in which arrangement is completed with a waterproof and corrosion-proof coating composition.

Description

Durability improvement method of steel structure or concrete structure

The present invention relates to a method of improving durability by preventing carbonation, preventing salt damage, waterproofing and anti-corrosion function by being applied to a medium-structure protective coating of a steel structure, a cross-section repair of a concrete structure, and a surface protective coating.

Due to the growth of the national economy and the expansion of social overhead capital, it is necessary to take measures to improve the durability and secure economic efficiency of important structures in coastal port areas and industrial parks.

Accordingly, the prior art emphasizes only the performance of chemical resistance such as acid resistance, alkali resistance, and salt water resistance (Patent 10-0910983), and does not converge the expansion rate of the structure due to climate (temperature) changes, resulting in cracking and peeling of the coating film Pulsation occurs. (Because the vibration of steel (steel bridge) structures is greater than that of concrete structures, it is affected by the adhesion of the coating and the painting by vibration.)

In addition, in the case of the existing coating method for re-coating steel (steel bridge) structures, surface treatment requires removal of all foreign substances showing up to 95% or more of the surface area, causing traffic jams in downtown areas and environmental problems in coastal and mountainous areas. You can.

On the other hand, despite the high durability of concrete structures, structural problems are derived by deterioration over time. Although these deterioration phenomena appear in various ways, cracks occur due to drying and temperature shrinkage of the concrete material itself, and neutralization of concrete is promoted at the cracks of these structures, and at the same time, deterioration occurs in the concrete part. There is a problem that the surface of the structure exhibits a phenomenon of peeling and peeling.

Accordingly, in this concrete structure, repair / reinforcement is inevitable due to structural problems such as deterioration and changes in external loads over time, and various mortars have been proposed as such repair / reinforcement mortars.

Accordingly, in Korean Patent Registration No. 663464, cement of 10 to 39.5% by weight; 30 to 35% by weight of fine aggregate; 10-15% by weight of fly ash; Lightweight beads having a ceramic material of 5 to 10% by weight, a specific gravity of 0.8 to 1, and a particle diameter of 60 to 150 μm; CSA expansion material of 3 to 5% by weight; 2-5% by weight of silica fume; 0.2 to 0.5% by weight of a fluidizing agent; 10-19.5% by weight of water; And PVA reinforcing fibers each having a length of 1 to 3% of the total volume of 8 to 12 mm; a mortar reinforced with fibers.

However, the above technique solves the cracking problem due to rapid reinforcement with reinforcing fibers, but may have limitations in application because resistance to various deterioration factors such as acid resistance and salt resistance may be required depending on the type of structure.

Republic of Korea Patent Registration No. 10-0910983 Republic of Korea Patent Registration No. 10-635464

The present invention is to solve the above problems, and can be applied to steel structures and concrete structures, and provides a construction method that can improve the durability of structures by expressing functions such as waterproofing and corrosion based on a uniform and tight structure. Willing.

To improve the durability of the steel structure or concrete structure of the present invention for solving the above problems (hereinafter referred to as "the construction method of the present invention"), the step of arranging the coated surface of the steel structure or the concrete structure (S10); It characterized in that it comprises a; step (S20) of painting with a waterproof, anticorrosive coating composition on the finished surface to be cleaned.

As one example, the waterproof and anticorrosive coating composition includes a resin, a curing agent, a pigment having an average particle diameter of 1 to 40 μm, a metal nanoparticle oxide having an average particle diameter of 40 to 250 nm, a dispersant, a thickener, a non-silicone interpolymer, and a filler. It is characterized by being formulated, including a flow inhibitor.

As an example, in a steel structure, before coating the waterproof / corrosion coating composition, a subject comprising an epoxy resin, an aliphatic compound butyl cellosolve, mica, talc, zinc metal, and aluminum powder, and a curing agent comprising polyamide It is characterized in that the auxiliary waterproof and anticorrosive coating composition composed of is coated on the surface to be coated.

As an example, in the step (S10) of arranging the surface to be coated of the concrete structure, the step of treating the surface in the surface to be coated of the concrete structure (S11); It characterized in that it comprises a; step (S12) for restoring the cross-section of the painted surface in the concrete structure.

As an example, in step S12, the cross-section of the surface to be coated in the concrete structure by the polymer mortar composition including cement, EVA-based polymer, phenoxy resin, calcium sulfaluminate, anti-shrinkage agent, antifoaming agent, silicone water repellent, and antirust agent It is characterized by recovering.

As an example, in the step S11, chipping the surface to be coated in a concrete structure and washing with high pressure (S111); Characterized in that it comprises; step (S112) of applying a pretreatment material composition containing a Teflon resin, calcium nitrite, a viscous agent, a viscous stabilizer on the surface to be coated in the concrete structure.

As an example, the viscous stabilizer is characterized in that a mixture of beta-carotene and triisooctyl phosphate.

As an example, the filler is characterized in that it contains carbon graphite and butyl rubber.

The method of the present invention can improve the durability by improving the resistance to waterproofing, anticorrosion, etc. by making the coating in the form of a dense square lattice structure by waterproofing and anticorrosive coating composition on a concrete structure or steel structure that has been cleaned up. There are advantages.

In addition, when the method of the present invention is applied to a steel structure, the secondary coating process is performed before the painting process of the waterproof / corrosion coating composition, so that even if the old coating film is simply processed using hand tools or power tools, the existing steel structure is repainted. Since it is possible, the process is easy and the air is shortened, which has the advantage of minimizing the problem of traffic congestion and environmental damage.

In addition, the construction method of the present invention has the advantage that the cross-section reinforcement is made of a material having excellent physical properties such as waterproof and rust-preventive properties prior to the coating process of a waterproof / corrosive coating composition when applied to a concrete structure.

1 is a block diagram showing the construction method of the present invention.
2 and 3 are schematic views showing a cross section formed by the method of the present invention.

Hereinafter, the present invention will be described in more detail through examples. Since the embodiment according to the present invention can be modified in many different forms, the scope of the present invention is not limited to the embodiments described below.

The construction method of the present invention comprises the steps of arranging a painted object of a steel structure or a concrete structure as shown in FIG. 1 (S10); It characterized in that it comprises a; step (S20) of painting with a waterproof, anticorrosive coating composition on the finished surface to be cleaned.

First of all, the construction method of the present invention has a step (S10) of arranging a painted object in various steel structures or various concrete structures.

In this step (S10), in the case of a steel structure, an old coating film is processed using hand tools or power tools.

However, since this process is not easy, the present invention provides an example in which the process of applying the auxiliary waterproofing / corrosion coating composition to be described below is published before the painting process by the waterproofing / corrosion coating composition in S20.

Because the auxiliary waterproofing and anticorrosive coating composition has excellent permeability to rust, it is easy to penetrate into the rust, and has excellent adhesion to metal, so it has excellent adhesion. After removing the loose black skin and rust on the surface of the steel structure completely, the old coating film is simply treated, and the temperature of the metal surface is 3 ° C or higher than the dew point. In this way, it is economical in terms of cost and time because the coating can be performed only with a simple coating process.

To this end, the auxiliary waterproofing and anticorrosive coating composition is characterized by comprising an epoxy resin, an aliphatic compound butyl cellosolve, mica, talc, zinc metal, aluminium powder, and a curing agent containing polyamide.

The subject is 3 to 7 parts by weight of aliphatic compound butyl cellosolve, 100 to 5 parts by weight of epoxy resin, 5 to 10 parts by weight of mica, 30 to 40 parts by weight of talc, 25 to 35 parts by weight of zinc metal and 25 to 35 parts of aluminum powder It is reasonable to mix by weight.

The aliphatic compound butyl cellosolve is used as a solvent, and it is effective to dissolve the epoxy resin and disperse other compositions by limiting the blending amount to 3 to 7 parts by weight.

In the case of the zinc metal, it is used as a pigment, and since the tendency of ionization is greater than that of iron, it releases electrons faster to prevent oxidation of iron. In addition, the mica, talc serves as a pigment to enhance the hardness of the lower layer.

It is reasonable that the zinc metal, mica, talc, and aluminum powder used as the pigment are limited to the composition ratio as mentioned above, which is less effective in preventing rust and hardness, and has a limited range. In the case of exceeding, the dispersion is not properly performed, and thus the adhesion is rather reduced.

In the auxiliary waterproofing / corrosion coating composition, the mixing ratio of the main material and the curing agent is preferably 6: 1 to 6.5: 1 by volume. When the mixed weight ratio satisfies the above range, it forms a strong bond with the steel structure, and exhibits excellent rust prevention function.

That is, since the strong adhesion of the epoxy resin and the excellent anti-rusting function by zinc metal and the curing reaction of mica and talc exert a mutually synergistic effect on the auxiliary waterproofing and anticorrosive coating composition, excellent adhesion and excellent anti-rusting function to the steel structure are exerted. will be.

On the other hand, in the step (S10) of arranging the painted surface of the concrete structure, the step of treating the surface in the painted surface of the concrete structure (S11); It characterized in that it comprises a; step (S12) for restoring the cross-section of the painted surface in the concrete structure.

In the step (S11) of treating the surface of the structure to be coated, the surface of the concrete structure is treated to remove impurities on the surface to be coated by chipping and high-pressure washing.

Next, there is a step (S12) of restoring the cross section of the concrete structure to be coated. In the concrete structure, the cross section is restored to the surface to be coated and the background is adjusted.

In the present invention, in the step S12, an example of restoring the cross-section of the structure to be coated by a polymer mortar composition comprising cement, EVA polymer, phenoxy resin, calcium sulfaluminate, anti-shrinkage agent, antifoaming agent, silicone water repellent, and rust inhibitor Is presented.

Preferably, the polymer mortar composition is 5 to 20 parts by weight of EVA-based polymer, 5 to 10 parts by weight of phenoxy resin, 3 to 8 parts by weight of calcium sulfaluminate, 0.5 to 2 parts by weight of a shrinkage inhibitor, based on 100 parts by weight of cement, It is advisable to mix 0.5 to 2 parts by weight of the antifoaming agent, 0.5 to 2 parts by weight of the silicone water repellent, and 0.5 to 2 parts by weight of the rust inhibitor.

In the present invention, the cement may include a fast-hardening cement, and while the fast-hardening is expressed, a fly ash or blast furnace slag may be used as a mixed material to partially replace the cement.

The fast-hardening cement is preferably one of calcium sulfoaluminate (CSA), alumina cement, and calcium aluminate (C12A7) or a mixture thereof in order to exhibit super-hardness.

The EVA (ethylene vinyl acetate) polymer is intended to express the cohesive force and waterproof properties of the paste.

The calcium sulfaluminate is an expansion agent for controlling cracks such as temperature cracking that may occur during the curing process, and the shrinkage preventing agent also controls cracking by controlling shrinkage of the paste such as dry shrinkage.

The rust inhibitor is characterized in that it is one of calcium nitrite, benzoate, phosphate, silicate or a mixture thereof.

In the past, silica fume was added for strength reinforcement and the like, but when silica fume was added, the strength was reinforced, but there was a problem in that workability was reduced. Accordingly, in the present invention, a water-soluble phenoxy resin is added.

The water-soluble phenoxy resin is water-soluble or water-dispersible and can be stabilized in water, preferably a polymer having a number average molecular weight of about 20,000 to 60,000. The phenoxy resin having the above molecular weight can be obtained by increasing the molecular weight to the above range using an epoxy resin and bisphenol A.

In order to solubilize the phenoxy resin, the obtained phenoxy resin is made to have an acid neutralizing group using a tertiary amine having a hydroxyl group, to which is neutralized by introducing phosphoric acid as a neutralizing agent for water solubilization and adding water. It can be used by preparing a water-soluble phenoxy resin solution.

The water-soluble phenoxy resin is added as a water-soluble polymer to impart a coating function through a polymer emulsion of an aqueous component.

That is, the water-soluble phenoxy resin is dispersed in water to form a polymer film according to evaporation by application, etc., thereby suppressing water evaporation from the particle surface. That is, by preventing water evaporation with the water-soluble phenoxy resin, cracks due to capillary phenomenon are controlled. In addition, it is to solve the problem of the decrease in fluidity due to evaporation of water.

In the present invention, the step of treating the surface of the surface to be coated in the concrete structure (S11) includes chipping the structure to be coated and washing with high pressure (S111); The step of applying a pretreatment material composition containing a Teflon resin, calcium nitrite, a viscous agent, and a viscous stabilizer on the surface to be coated with the structure (S112); presents an example including.

Preferably, the pretreatment material composition is suitable to be blended with 1 to 5 parts by weight of calcium nitrite, 1 to 5 parts by weight of a viscous agent, and 1 to 3 parts by weight of a viscous stabilizer with respect to 100 parts by weight of Teflon resin.

The pre-treatment material composition is applied to the exposed cross-section and the reinforcing bar after cross-sectioning, that is, deterioration of chipping, rebar rust removal, etc. in the surface to be coated in the previous step (S111). This is to prevent the deterioration of the recovery section by blocking the direct exposure to the polymer mortar of corrosion points and moisture, which may remain even by cross-sectioning, while improving the adhesion.

The pre-treatment material composition, Teflon resin is used as the main material. In general, when an epoxy-based material or the like is used as the main material of the primer, it exhibits a strong alkali property of the concrete cross-section, and also shows a strong alkali property in the case of a polymer mortar for recovery. In the case of existing primers, etc., there is a problem of reducing the function as a primer by reducing the viscosity in a strong alkaline environment. In the case of Teflon resin, the viscosity is maintained even under a strong alkaline environment, so adhesion between the object to be repaired and reinforced and the polymer mortar for recovery This is because it is maintained.

The calcium nitrite is intended to prevent the expansion of corrosion by the fine rust remaining in the reinforcing bar despite the cross-sectioning.

However, if only calcium nitrite is added, corrosion resistance to fine rust remaining in the reinforcing bar can be improved, but there is a problem that the property can be deteriorated due to the excessive addition of calcium nitrite. There exists a case where moisture exists in these micropores, and thus, the moisture present in the reinforcing bars also causes corrosion of the reinforcing bars.

Accordingly, the limestone powder may be further added to the pretreatment agent of the present invention.

The reason why the limestone powder is added is that the limestone powder absorbs moisture present in the reinforcing bar to improve rust resistance in the reinforcing bar, and at the same time, the limestone powder absorbed by water expands and cracks due to shrinkage during curing of the pretreatment material. It is for control.

As the limestone powder, limestone calcined at 1000 to 1300 ° C is used. The calcined limestone allows calcium oxide to be produced while hydrating calcium oxide to expand the paste when compounding, and the limestone powder absorbs moisture contained in the pores of the rebar. As the calcium oxide is absorbed and hydrated, expansion occurs in the process of producing calcium hydroxide. This expansion is known to be apparently expanding in volume while leaving voids, and the expansion is known to be caused by two stages of expansion. It is known to grow into elongated anisotropic hexagonal crystals even after the initial expansion upon creation and complete termination.

Therefore, the limestone powder absorbs moisture existing in the pores of the reinforcing bar and expands itself, and this expansion is to improve the crack resistance by expanding the paste.

The viscous agent is intended to enhance adhesion, and the viscous agent is not limited to its type.

However, when only a viscous agent is used, when a polymer mortar is applied thereafter, a decrease in viscosity occurs due to heat of the polymer mortar, which eventually leads to a decrease in the ability to improve adhesion as a function of the pretreatment material. It is to be added more.

Preferably, the present invention provides an example in which a mixture of beta-carotene and triisooctyl phosphate is included as the viscous stabilizer.

The beta-carotene has excellent water retention, so it has an advantage of preventing a change in viscosity over time. However, in the curing process, especially in the summer when the temperature is high, viscosity may decrease as the temperature increases during the curing process.

Accordingly, the present invention provides an example in which a mixture in which triisooctyl phosphate is added in addition to beta-carotene as a viscous stabilizer is applied. That is, triisooctyl phosphate is added to beta-carotene in addition to beta-carotene as a viscosity stabilizer. Triisooctyl phosphate is excellent in heat resistance so that the gel network is not destroyed even when the temperature rises, and the temperature rise of beta-carotene is a problem mentioned above. It is to control the problem of viscosity reduction according to.

Preferably, beta-carotene and triisooctyl phosphate are appropriately mixed in a weight ratio of (3 to 7) :( 4 to 6).

As described above, after the step S10 for the concrete structure or the steel structure, there is a step (S20) of coating with a waterproofing and anticorrosive coating composition on the finished coated object.

By doing so, as shown in FIG. 1, in the steel structure (C-1), the coating layer 2 is formed by the waterproof / corrosion coating composition, and in the concrete structure (C-2), the cross-section recovery by the polymer mortar composition is performed. The layer 3 is formed so that the coating layer 2 by the waterproof / corrosion coating composition is formed on the cross-section recovery layer 3.

In particular, the waterproof and anticorrosive coating composition includes resins, curing agents, pigments having an average particle diameter of 1 to 40 μm, metal nanoparticle oxides having an average particle diameter of 40 to 250 nm, dispersants, thickeners, non-silicone interpolymers, fillers, and flows. It characterized in that it comprises an inhibitor.

The waterproof / anticorrosion coating composition is preferably 10 to 20 parts by weight of a curing agent, 100 to 80 parts by weight of a pigment having an average particle diameter of 1 to 40 µm, and metal nanoparticles having an average particle diameter of 40 to 250 nm relative to 100 parts by weight of the resin. It is reasonable to include 6 to 40 parts by weight of oxide, 2 to 5 parts by weight of dispersant, 2 to 5 parts by weight of thickener, 2 to 5 parts by weight of non-silicone interpolymer, 5 to 10 parts by weight of filler, and 2 to 5 parts by weight of flow inhibitor .

The water-proof and anticorrosive coating composition has the effect of filling the pores of large particles due to the difference in particle size and density between pigments having an average particle diameter of 1 to 40 μm and metal nanoparticles of 40 to 250 nm. It forms a passive square lattice structure (cube structure, thus referred to as "nanocube") to form a passivation film, thereby improving functions such as abrasion resistance, flame resistance, corrosion resistance, and adhesion, thereby preventing the penetration of the structure and blocking harmful factors. It is to be able to increase the durability.

It is reasonable that the pigment has an average particle diameter of 1 to 40 µm, and the metal nanoparticle oxide has a particle diameter of 40 to 250 nm, which has the same basic arrangement for each particle, but has different orientations and different particles and particles. The more grain boundaries per unit area present therebetween, the stronger the mechanical properties. As a result, it acts as a frame for the flake structure, and the fine film is filled with fine metal nanoparticle oxide to fill the square. To make the structure

The waterproof and anticorrosive coating composition can be used in the following three embodiments.

First, the first embodiment is a case in which a base layer is formed on a surface to be coated of a structure.

In this case, it is preferable to use a silicone-modified epoxy resin (Silicone Modified Epoxy Resine).

Further, it is preferable to use a polyamide room temperature curing type curing agent.

It is reasonable that the pigment of this example does not contain lead, cadmium, mercury, arsenic, antimony and their compounds and hexavalent chromium compounds, and is one of titanium dioxide, talc, silicon dioxide, aluminum powder, ceramic, or a mixture thereof. .

In addition, in this embodiment, the metal nanoparticle oxide is titanium dioxide, silicon dioxide, manganese, magnesium, aluminum, zinc oxide, indium tin oxide, magnesium silicate, magnesium oxide, antimony oxide, kaolin, silica dioxide, alumina trioxide, 3 It is reasonable to be a mixture of one or more of molybdenum oxide, niobium pentoxide, vanadium pentoxide, and tungsten bronze.

In addition, it is preferable to use a surfactant (Unsaturated Polymide acid Ester Salts) as a dispersant.

In addition, it is preferable to use a thickening agent of organic clay (organic clay).

In addition, it is preferable to mix the non-silicone-based interpolymer, the flow inhibitor, and the anti-settling agent.

In addition, the present embodiment is characterized in that 20 to 50 parts by weight of a solvent is further included with respect to 100 parts by weight of the resin.

Here, the solvent is an aromatic-based solvent (toluene, xylene), ketone-based solvent, or a mixture of two or more of an alcohol-based solvent is used, preferably, the volatile organic compound content of 300 (g / L) or less, volatile aromatic hydrocarbon content 25% by weight It is preferable to use less than 0.1% and less than 0.1% by weight of benzene to promote eco-friendliness.

As a second embodiment of the present invention, the waterproofing and anticorrosive coating composition presents an example used as a solvent-free solid content waterproofing and anticorrosive composition.

In the present embodiment, the resin is preferably an epoxy-based resin, one of which is a reaction product of epichlorohydrin and bisphenol A or an epoxy resin composed of a reaction product of epichlorohydrin and bisphenol F.

Even in the case of this embodiment, the pigment does not contain lead, cadmium, mercury, arsenic, antimony and their compounds and hexavalent chromium compounds, but carbon black, titanium dioxide, iron oxide, phthalocyanine blue, calcium carbonate, silica, barium sulfate, It is reasonable to use one of talc, claymica, bentonite, silica sand, ceramics or mixtures thereof.

Other curing agents, metal nanoparticle oxides, dispersants, thickeners, non-silicone-based interpolymers, flow inhibitors, sedimentation inhibitors are preferably used in the same manner as in the first embodiment.

As a third embodiment of the present invention, the waterproof / corrosion coating composition presents an embodiment used as a top layer or finishing layer composition that blocks harmful factors.

In this embodiment, it is reasonable that the resin is a silicone-modified acrylic polyol resin (Silicone Modified Acrylic Copolymer).

It is also reasonable that the curing agent of the present embodiment is a polyisocyanate curing agent.

Also, in the case of the pigment of the present embodiment, lead, cadmium, mercury, arsenic, antimony and their compounds and hexavalent chromium compounds are not included, but one of titanium dioxide, talc, aluminum powder, zinc metal, mica, barium sulfate, and ceramic Or a mixture thereof.

Other metal nanoparticle oxides, dispersants, thickeners, non-silicone interpolymers, flow inhibitors, sedimentation inhibitors are preferably used in the same manner as in the first and second embodiments.

In addition, in this embodiment, it is reasonable to add a wet dispersant.

The present embodiment is also characterized in that 20 to 50 parts by weight of a solvent is further included with respect to 100 parts by weight of the resin. Here, the solvent is an aromatic solvent (toluene, xylene), ketone solvents, alcohols, or one or more mixtures of two or more solvents are used, preferably, volatile organic compound content of 300 (g / L) or less, volatile aromatic hydrocarbon content of 25% by weight It is preferable to use less than 0.1% and less than 0.1% by weight of benzene to promote eco-friendliness.

It is reasonable to limit the pigment to have an average particle diameter of 1 to 40㎛. The reason for this limitation is to limit the function as a sufficient frame when it has a smaller particle size, and if it exceeds this, the specific gravity becomes too large, so that the dispersibility is reduced and non-uniform physical properties can be expressed.

In addition, it is reasonable to limit the metal nanoparticle oxide to have an average particle diameter of 40 to 250 nm. Here, if the metal nanoparticle oxide is less than 40 nm, the distribution of the average particle size is too low, and thus the price is expensive, and thus there is an uneconomical problem. If it exceeds 250 nm, the distribution of the average particle size is large, and thus the gap between flakes formed in the pigment is This is limited because it does not fill properly and hinders the tight structure.

On the other hand, the filler may include carbon graphite and butyl rubber, but this embodiment has high applicability, particularly when the eco-friendly coating composition is used as the top coat or finish layer mentioned above.

The carbon graphite is for reinforcing the strength and to improve the impact resistance against external shock, and to control the generation of static electricity by adding carbon graphite as a conductor to prevent foreign matter from being deposited on the surface by static electricity. That is, in the case of accumulation of foreign matter, it is possible to cause problems such as corrosion on the surface, so that it is controlled.

Also, in addition to the carbon graphite, butyl rubber is added. The butyl rubber is a rubber obtained by ion-polymerizing isobutylene and a small amount of isoprene in a liquid at a low temperature. Isoprene mixture and pure methyl chloride are added, anhydrous aluminum chloride is added as a catalyst, and then placed in a polymerization reactor to be polymerized at a low temperature of about -100 ℃. Halogenated butyl rubber and polyisobutyl as there is no unsaturation, pattern viscosity and contamination. It is divided into several types, such as Len. Such butyl rubber absorbs impact well and has flexibility even at a low temperature of about -50 ° C because the elastic body does not crystallize well even at low temperatures.

The reason why the butyl rubber is added is that the impact on the expansion and contraction of the butyl rubber is not only enhanced in impact resistance, but also in the continuous expansion and contraction of the paste in the process of freezing and thawing in the winter and the like due to material properties that do not lose elasticity even at low temperatures. It is possible to improve the cold resistance by allowing the relaxation.

That is, if the paste is repeatedly frozen and frozen at low temperature, cracks may be generated in the paste by repeated expansion and contraction. As the butyl rubber can maintain elasticity even at low temperatures, it can compensate for this expansion and contraction. It is possible to control the abnormality.

As shown in Table 1 below, the waterproof / corrosion coating composition has a low content of volatile organic compounds, and it can be seen that benzene, lead, cadmium, mercury, and hexavalent chromium are not detected. Is proving that

In addition, as shown in Table 2, it appears to derive excellent results in terms of acid resistance, chemical resistance, water resistance, etc., and adhesion strength. Metal nanoparticles of ~ 250nm exert the effect of filling the pores of large particles by the difference in particle size and density, so that the resin, pigment, and metal nanoparticles have a dense square lattice structure (cube structure, thus referred to as "nanocube"). It is believed that this is due to the formation of a passivation film.

As described above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited to the above embodiments, and the contents described above by those skilled in the art to which the present invention pertains Of course, various modifications and variations may be possible.

2: Coating layer 3: Sectional recovery layer

Claims (8)

The step of treating the surface of the concrete structure to be coated (S11) and the cement, EVA-based polymer, phenoxy resin, calcium sulfaluminate, anti-shrinkage agent, antifoaming agent, silicone water repellent, rust inhibitor by the polymer mortar composition A step (S10) of arranging the object to be coated, including a step (S12) of restoring the cross-section of the object to be coated;
On the finished surface to be cleaned, resins, curing agents, pigments having an average particle diameter of 1 to 40 µm, metal nanoparticle oxides having an average particle diameter of 40 to 250 nm, dispersants, thickeners, non-silicone interpolymers, fillers, and flow inhibitors Including the step of coating a waterproof, anticorrosive coating composition (S20);
The filler,
A method for improving the durability of a concrete structure, characterized in that graphite and butyl rubber having carbon components are included to prevent deposits of foreign substances due to static electricity and to prevent cracking of paste due to freezing and thawing by maintaining expansion and contraction at low temperatures.
delete delete delete delete According to claim 1,
In step S11,
Chipping the object to be coated and washing it under high pressure (S111);
Applying a pretreatment material composition containing a teflon resin, calcium nitrite, a viscous agent, and a viscous stabilizer to the surface to be coated (S112);
A method of improving durability of a concrete structure, characterized in that it is included.
The method of claim 6,
The viscosity stabilizer is a method of improving the durability of a concrete structure, characterized in that a mixture of beta-carotene and triisooctyl phosphate. delete

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