KR100475366B1 - a process for preventing a concrete carbonation and deterioration - Google Patents

Abstract

The present invention, in the neutralization and deterioration prevention method of concrete, 45 to 55 parts by weight of the main material mixed with epoxy resin, modified epoxy resin, alumina or aluminum hydroxide, crude steel cement, solvent and other components, and polyamide resin , A modified amine resin, a modified aromatic amine resin, titanium dioxide, aluminum silicate, mixed with 45 ~ 55 parts by weight of a mixed hardener including water and other components to prepare a coating material, and then to the concrete surface After application; 59.9 to 73.3 parts by weight of a mixed main material including an acrylic resin or a modified acrylic resin, titanium dioxide, a polyester resin or a modified polyester resin, a solvent and other components, a urethane resin or a modified urethane resin, and a solvent A top coat is prepared by mixing 30 to 36.63 parts by weight of a curing agent, and then the top coat is applied to the top surface of the bottom coat, and maintains strong adhesion to the concrete matrix so that it is not separated from the concrete matrix, and has chemical resistance, impact resistance and abrasion resistance. Freeze solubility is remarkably improved and yellowing is prevented.

Description

Process for preventing a concrete carbonation and deterioration

The present invention relates to a method for preventing neutralization and deterioration of concrete.

In concrete structures, carbon dioxide and moisture react with the passage of the seal, causing corrosion of the rebar in the concrete. Carbonation, sea breeze, seawater, and calcium chloride bases for snow removal penetrate the concrete and cause corrosion in the rebar. Deterioration due to chloride intrusion, alkali-silica reaction, which causes high alkali cement and certain aggregates to react and expand in the presence of moisture, resulting in cracking of concrete, resulting in shortened lifespan.

In particular, the recent increase in traffic volume is the situation that the neutralization rate of concrete is rapidly increasing due to the generation of carbon dioxide in the exhaust gas emitted from cars, and when the concrete is neutralized, the passivation film protecting the reinforcing bar is destroyed and the steel is corroded. When the steel reinforces in the concrete, cracking and peeling of the concrete occurs due to expansion of the reinforcing bar volume, and in severe cases, the structure collapses.

Therefore, it is necessary to suppress the corrosion of reinforcing steel in the concrete, and the method of preventing the deterioration of concrete by the aluminum oxide film preventing the deterioration of concrete by forming the aluminum oxide film on the concrete surface to prevent the corrosion of the steel inside the patent is disclosed. No. 1999-14610 and Patent Publication No. 2000-6872.

The Patent Publication No. 1999-12610 discloses aluminum flakes or powders, one-component polyurethane resins or two-component epoxy resins and solvents having an adhesive strength of 40 kg / cm 2 or more, which are mixed into a liquid to form a liquid and bonded to an aluminum oxide. It is a method of forming a film. Further, the Patent Publication No. 2000-6872 is made of a liquid by mixing aluminum flake or powder, one-component polyurethane resin or two-component epoxy resin, xylene with an adhesive strength of more than 40 kg / ㎠ and bonded to the concrete surface To form an aluminum oxide film.

By the way, the conventional deterioration prevention method disclosed in the Patent Publication Nos. 1999-12610 and 2000-6872, the organic polyurethane resin or epoxy resin is applied and adhered to the concrete surface formed of inorganic cement, peeling off the coating layer There is a problem that the coating layer is eliminated in the long term, and in particular, the freeze-solubility is weak so that the physical properties of the initial change due to climate change during the winter and summer periods do not function properly to prevent deterioration.

In addition, the coating layer constructed by the conventional deterioration prevention method has a problem that the appearance of the concrete structure is not beautiful because a yellowing phenomenon of the polyurethane resin and epoxy resin fading after a long time.

Therefore, the present invention has been made to solve the above problems, the object of the present invention is that the coating material is not separated from the concrete matrix by maintaining a strong adhesive force to the concrete matrix, chemical resistance, impact resistance and wear resistance, freeze-dissolution is significantly improved In addition, the present invention provides a method for preventing neutralization and deterioration of concrete to prevent yellowing.

The neutralization and deterioration prevention method of concrete according to the present invention includes an epoxy resin, a modified epoxy resin, 45 to 55 parts by weight of a mixed main material including alumina or aluminum hydroxide, crude steel cement, a solvent and other components, and a polyamide resin. , A modified amine resin, a modified aromatic amine resin, titanium dioxide, and a coating material mixed with 45 to 55 parts by weight of a mixed hardener including aluminum silicate, water and other components were applied to the concrete surface, and then acrylic resin or modified 59.9 to 73.3 parts by weight of mixed main material including acrylic resin, titanium dioxide, polyester resin or modified polyester resin, solvent and other components, and a curing agent 30 to 36.63 including urethane resin or modified urethane resin and solvent A top coat material obtained by mixing parts by weight is coated on the top surface of the bottom coat material.

Among the main 45 ~ 55 parts by weight of the base material, the epoxy resin and the modified epoxy resin is 13.5 ~ 16.5 parts by weight, 4.5 ~ 5.5 parts by weight of alumina or aluminum hydroxide, 13.5 ~ 16.5 parts by weight of the cement for steelmaking, the curing agent of the base material Among 45 to 55 parts by weight, polyamide resin, modified amine resin and modified aromatic amine resin are 11.25 to 13.75 parts by weight, water is 22.5 to 27.5 parts by weight, aluminum silicate is 4.5 to 5.5 parts by weight, titanium dioxide is 2.7 to 3.3 parts by weight Among 59.9 to 73.3 parts by weight of the main material of the coating material, 21.6 to 26.4 parts by weight of acrylic resin or modified acrylic resin, 8.37 to 10.23 parts by weight of titanium dioxide, and 9.5 to 11.7 parts by weight of polyester resin or modified polyester resin. The urethane resin or the modified urethane resin is 13.5 to 16.5 parts by weight in the curing agent 30 to 36.63 parts by weight of the top coat material.

The main material of the coating material further contains talc powder, sedimentation inhibitor, oxide black as other components, and the curing agent of the coating material further contains butyl cellosolve, antifoaming agent, and anti-settling agent as other components. The component further contains talc powder, quencher, dispersant, antifoaming agent and oxide black. In addition, the subject matter of the top coat further contains a pigment.

The solvent is selected from at least one of cellulsolve acetate, isopropyl alcohol, butyl cellulsolve, butyl acetate, toluene and methyl isobutyl ketone.

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

The present invention is made by sequentially applying the coating material and the top coating on the surface of the concrete. The undercoat and the topcoat are prepared by mixing the main and the hardener, respectively.

The main material of the base material is 9 to 11 parts by weight of epoxy resin, 4.5 to 5.5 parts by weight of modified epoxy resin, 4.5 to 5.5 parts by weight of alumina or aluminum hydroxide, 13.5 to 16.5 parts by weight of cement for steelmaking, 8.1 to 9.9 parts by weight of solvent, and other components. A total of 45 to 55 parts by weight, the solvent is composed of 5.4 to 6.6 parts by weight of cellulsolve acetate and 2.7 to 3.3 parts by weight of isopropyl alcohol, 4.5 to 5.5 parts by weight of talc powder and 0.72 to 0.88 parts by weight of anti-settling agent It is preferable that the portion consists of 0.18 to 0.22 parts by weight of oxide black.

The hardening agent of the base material, polyamide resin 8.1 to 9.9 parts by weight, modified amine resin 1.35 to 1.65 parts by weight, modified aromatic amine resin 1.8 to 2.2 parts by weight, aluminum silicate 4.5 to 5.5 parts by weight, water 22.5 to 27.5 parts by weight, dioxide 2.7-3.3 parts by weight of titanium and 45-55 parts by weight of other components in total are included. Other components are preferably 3.42-4.18 parts by weight of butyl cellulsolve, 0.45 to 0.55 parts by weight of antifoaming agent and 0.18 to 0.22 parts by weight of anti-settling agent. .

The main material of the coating material is acrylic resin or modified acrylic resin 21.6 ~ 26.4 parts by weight, polyester resin or modified polyester resin 9.5 ~ 11.7 parts by weight, titanium dioxide 8.37 ~ 10.23 parts by weight, solvent 6.3 ~ 7.7 parts by weight, other components In total, 59.9 to 73.3 parts by weight, the solvent consists of 3.6 to 4.4 parts by weight of butyl acetate and 2.7 to 3.3 parts by weight of toluene, and other components include 9.18 to 11.22 parts by weight of talc, 3.69 to 4.51 parts by weight of quencher, and dispersant 0.54. It is preferable that it consists of-0.66 weight part, 0.27-0.33 weight part of antifoamers, and 0.45-0.55 weight part of oxide black. In addition, the subject matter of the topcoat may further comprise a pigment.

The curing agent of the top coating material is composed of 13.5 to 16.5 parts by weight of urethane resin or modified urethane resin, and 16.5 to 20.13 of solvent, wherein the solvent is 7.11 to 8.69 parts by weight of toluene, 2.07 to 2.53 parts by weight of methyl isobutyl ketone and 6.57 parts of butyl acetate. It is preferable that it consists of-8.03 weight part and 0.72-0.88 weight part of cellulsolve acetates.

The steel cement for the base material is mixed with the water of the hardener to have a strong adhesion to the concrete surface. That is, since the undercoat material forms an inorganic layer and has affinity with the concrete surface and is adhered to the concrete surface by the adhesive force such as an epoxy resin, the coating layer does not peel off even after curing.

In addition, alumina, aluminum hydroxide, aluminum silicate and titanium dioxide increase the impact resistance and wear resistance, and the top coating material is excellent in chemical resistance such as chemical resistance, corrosion resistance, salt resistance, and prevents yellowing of the surface.

In addition, the network structure by the chemical reaction of the epoxy resin, the main component of the coating material, and the drying hardening by the hydration reaction of the cement for cement steel and alumina, aluminum hydroxide and aluminum silicate are synergistic and simultaneously show a firm and excellent adhesion to the concrete surface. The dry hardened coating film containing inorganic aluminum silicate and alumina or aluminum hydroxide with excellent heat and fire resistance is excellent in freezing solubility and durability in harmony with the coating function of the top coating material, and it is excellent in early winter and summer climate change. The physical properties of the will remain as it is.

Next, a method of applying the undercoat and the topcoat to the concrete surface will be described.

First, remove foreign substances (oil, dirt, etc.) on the concrete surface. In this case, when applied over a wide range of surfaces, 2 ~ 3% hydrochloric acid solution is sprayed, washed with water and dried. In the case of reinforcement construction of deteriorated concrete structures, they should be sufficiently dried after high pressure washing. And if there is an excitation part of the concrete surface, this excitation part is removed, and the damaged part or the uneven part is smoothed by mortar of the said base material. The mortar of the undercoating material is a filler repairing material made of putty by mixing silica sand with the components of the undercoating material.

In case of repair reinforcement of concrete structure, if the crack width of concrete surface is more than 2mm, cut it into V-shape and fill and repair it with mortar of subcontracting material. Fill the empty spaces or joints with the mortar of the undercoat material, and then smooth out the repaired parts.

Next, the main components of the coating material are mixed and stirred with a stirrer or the like, while the curing agent components of the coating material are mixed and stirred with a stirrer or the like, and then the mixed curing agent of the coating material is added to the mixed coating material and stirred with a stirrer or the like. Next, the base material mixed with the main material and the curing agent is applied to the concrete surface. At this time, since the mixed material is left for a long time, the physical properties change, so the coating work must be completed within about 1 hour (housework time) after mixing. The coating of the undercoat material may be performed once, but after the first application, it is preferable to apply the second application after confirming the dry state (solidification drying) after about 6 hours in a standard state (1 atm). Application is done with a brush, roller or spray gun. When the ingredients are mixed and left in the standard state (room temperature, 1 atm), the time taken to change the physical properties is called 'housework time'.

Next, the main components of the top coat material are mixed and stirred with a stirrer or the like, while the hardener components of the top coat material are mixed and stirred with a stirrer or the like, and then the cured agent of the mixed top coat material is added to the main material of the mixed top material and stirred and mixed with a stirrer or the like. Next, the top coat material mixed with the main material and the curing agent is applied to the top surface to which the base material is applied. At this time, the mixed top coating material is changed for a long time, so the coating work should be completed within about 2 hours after mixing. In addition, the coating of the top coat is carried out after confirming the undercoat application state and the dry hardening state after about 8 hours in the standard state after the coat is applied.

Although the coating of the top coat may be performed once, it is preferable to apply the second coating after confirming the dry condition (solidification drying) after about 6 hours in the standard condition after the first coating. Application is done with a brush, roller or spray gun.

The topcoat may be applied three or more times if it is necessary to further strengthen the construction surface.

After the coating of the coating material and the coating material is completed, all properties of the coating material and the coating material must be cured in a standard state for 7 days.

The following is a test result of the concrete structure constructed by the neutralization and deterioration prevention method of the concrete of the present invention. In the test construction, the coating material was applied twice on the concrete surface, and the coating material was applied twice on the upper surface of the applied coating material, and the composition of the coating material and the coating material is shown in Table-1 and Table-2.

Table-1. Composition of undercoat (unit is by weight)

Raw material name Furtherance Raw material name Furtherance subject Epoxy base resin 10 Hardener Polyamide resin 9 Modified epoxy resin 5 Modified amine resin 1.5 Aluminum hydroxide 5 Modified aromatic amine resins 2 Crude steel cement 15 Titanium dioxide 3 Acetic Cell Solution 6 Aluminum silicate 5 Isopropyl Alcohol 3 water 25 Talc 5 Butyl cellosolve 3.8 Sedimentation inhibitors 0.8 Antifoam 0.5 Oxide black 0.2 Sedimentation inhibitors 0.2 system 50 system 50

Table-2. Composition of top coating (unit is by weight)

Raw material name Furtherance Raw material name Furtherance subject Modified acrylic resin 24 Hardener Urethane resin 15 Modified Polyester Resin 10.6 toluene 7.9 Titanium dioxide 9.3 Methyl isobutyl ketone 2.3 Butyl acetate 4 Butyl acetate 7.3 toluene 3 Acetic Cell Solution 0.8 Talc 10.2 Matting agent 4.1 Dispersant 0.6 Antifoam 0.3 Oxide black 0.5 system 66.6 system 33.3

1. Mechanics test

As shown in Table-3, absorption ratio, permeability ratio, adhesion strength, impact resistance, abrasion resistance, and stain resistance were tested.

Table-3. Mechanics test

Test Items Test result Test Methods Absorption Ratio (%) 1 hours 0.01 KS F 2451 5 hours 0.01 24 hours 0.01 Permeability ratio (%) 0.02 KS F 2451 Adhesion Strength (kgf / ㎠) 3 days 21.8 KS F 2451 7 days 27.7 14 days 28.1 Impact resistance clear KS F 4921 Wear resistance clear ASTM D 4060 Pollution resistance clear KS M 3802

2. Performance test

As shown in Table 4, the mixing, workability, pot life, and drying time were tested for each of the top coat and the top coat. Weather resistance and ozone resistance were tested.

Table-4. Performance test

Test Items Test result Test Methods Mixed Hadojae clear KS M 5307 Topcoat clear Workability Hadojae clear KS M 5307 Topcoat clear Pot life (hr) Hadojae One KS M 5307 Topcoat 2 Drying time (hr) Hadojae 6 KS M 5307 Topcoat 6 State of dry coating clear KS M 5307 PH (mixed) Hadojae 11.5 KS M 0100 Freeze Dissolution Repeatability (-20 ± 2 ℃ x20hr, 80 ± 2 ℃ x20hr x Repeat) clear KS M 5307 Salt Spray (120hr) clear KS M 5307 Accelerated weathering resistance (200hr) clear KS F 3211 Ozone Resistance (50ppm x 40 ± 2 ℃ x 168hr) clear KS F 3211

3. Chemical resistance test

As shown in Table-5, chemical resistance against acids, alkalis, salts and petroleum was tested.

Table-5. Chemical Resistance Test

Test Items Test result Test Methods mountain 25% hydrochloric acid 168 hr clear KS M 5000 30% sulfuric acid 168 hr clear alkali 25% ammonia water 168 hr clear 30% caustic soda 168 hr clear salts Saturated sodium chloride solution 168 hr clear Calcium Chloride Solution 168 hr clear Petroleum Industrial Vol. 2 Gasoline 168 hr clear

4. Dissolution test

As shown in Table 6, elution properties such as turbidity, chromaticity, odor, taste, potassium permanganate consumption, etc. were tested.

Table-6. Dissolution Test

Test Items Test result Test Methods Turbidity (degrees) 0.5 or less KS F 4921 Chromaticity (degrees) 1 or less smell clear flavor clear Potassium Permanganate Consumption (mg / l) 1.0 Residual Chlorine Loss (mg / ℓ) Not detected draft Not detected Phenols (mg / l) Not detected Epichlorohydrin Not detected Amines Not detected

As can be seen from the above test results, according to the neutralization and deterioration prevention method of concrete according to the present invention, the concrete has good absorbency, excellent adhesion and waterproofness, and chemical resistance such as durability, chemical resistance, corrosion resistance, salt resistance, etc. It is excellent, prevents yellowing, and has excellent performances such as impact resistance, abrasion resistance, and freeze dissolution.

Neutralization and deterioration prevention method of concrete according to the present invention, the external exposure surface, water purification plant, various waterways, water and sewage intake, dam, drain tower, waste water, sewage treatment plant, etc. External exposed surfaces such as tunnels, banca, common wards, cyclones, nuclear power plants, etc., external walls, subway walls, underground walkways, driveway walls, bridges, bridges and national roads, concrete facilities such as highways, concrete structures on the beach, It can be applied to salt water for port facilities, prevention of salt from sea winds, waterproofing of all facilities of concrete structures (civil engineering, construction), as well as neutralization and salt prevention.

According to the neutralization and deterioration prevention method of the concrete according to the present invention, it has good absorbency to the concrete matrix, excellent adhesion and waterproof, excellent chemical resistance, such as durability, chemical resistance, corrosion resistance, salt resistance, and prevent yellowing, It has excellent performances such as impact resistance, abrasion resistance, and freeze soluble.

Claims (3)

In the neutralization and deterioration prevention method of concrete, 45 to 55 parts by weight of a mixed main material including epoxy resin, modified epoxy resin, alumina or aluminum hydroxide, crude steel cement, solvent and other components, Applying to the concrete surface a mixed material comprising 45 to 55 parts by weight of a polyamide resin, a modified amine resin, a modified aromatic amine resin, titanium dioxide, aluminum silicate, and a mixed hardener including water and other components; 59.9 to 73.3 parts by weight of a mixed main material including an acrylic resin or a modified acrylic resin, titanium dioxide, a polyester resin or a modified polyester resin, a solvent and other components, A method of preventing neutralization and deterioration of concrete, comprising coating a top coat material obtained by mixing a urethane resin or a modified urethane resin with 30 to 36.63 parts by weight of a mixed hardener including a solvent. The method of claim 1, Among the main 45 ~ 55 parts by weight of the base material, the epoxy resin and the modified epoxy resin is 13.5 to 16.5 parts by weight, 4.5 to 5.5 parts by weight of alumina or aluminum hydroxide, 13.5 to 16.5 parts by weight of steel cement, 8.1 to 9.9 Parts by weight and other ingredients are from 5.4 to 6.6 parts by weight, Among 45 to 55 parts by weight of the curing agent of the undercoat material, 11.25 to 13.75 parts by weight of polyamide resin, modified amine resin and modified aromatic amine resin, 22.5 to 27.5 parts by weight of water, 4.5 to 5.5 parts by weight of aluminum silicate, titanium dioxide 2.7 ~ 3.3 parts by weight, other components are 4.05 ~ 4.95 parts by weight, Among 59.9 to 73.3 parts by weight of the main coating material, acrylic resin or modified acrylic resin is 21.6 to 26.4 parts by weight, titanium dioxide is 8.37 to 10.23 parts by weight, polyester resin or modified polyester resin is 9.5 to 11.7 parts by weight, solvent 6.3 ~ 7.7 parts by weight, other components 14.13 ~ 17.27 parts by weight, Among 30 to 36.63 parts by weight of the curing agent of the top coating material, the urethane resin or modified urethane resin is 13.5 to 16.5 parts by weight, the solvent is 16.5 to 20.13 parts by weight of the concrete neutralization and deterioration prevention method The method according to claim 1 or 2, Other components included in the main material of the coating material is talc powder 4.5 to 5.5 parts by weight, sedimentation inhibitor 0.72 to 0.88 parts by weight, oxide black 0.18 to 0.22 parts by weight, Other components included in the hardener of the undercoat material are 3.42 to 4.18 parts by weight of butyl cellulsolve, 0.45 to 0.55 part by weight of antifoaming agent, and 0.18 to 0.22 part by weight of antisettling agent, Other components included in the subject of the coating material include talc powder 9.18 to 11.22 parts by weight, matting agent 3.69 to 4.51 parts by weight, dispersant 0.54 to 0.66 parts by weight, antifoaming agent 0.27 to 0.33 parts by weight, oxide black 0.45 to 0.55 parts by weight, In addition, the theme of the top coating material is a neutralization and deterioration prevention method of concrete, characterized in that it further contains a pigment.