KR101049960B1 - Maintenance method of structure using eco-friendly silicate incombustible coating material - Google Patents

Abstract

PURPOSE: A maintaining method of a building is provided to improve the intensity and durability of concrete by using an environment-friendly silicate non-combustible coating material. CONSTITUTION: Foreign material and laitance are removed from a damaged building surface. A repair work is operated on the building surface. A penetrability silicate primer is coated on the building surface. A silicate non-combustible coating material is coated on the building surface. A water-repellent contamination-resistant coating material is coated on the building surface.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing buildings using an environmentally friendly silicate non-burnable coating material,

The present invention relates to a method of repairing a building, and more particularly, to a method of repairing a building using an environmentally friendly silicate fireproof coating material.

In general, architectural structures based on brick or concrete materials, which are classified as inorganic materials, are composed of building materials used while building a new house, volatile organic compounds generated from various materials such as adhesives and paints, and radon, asbestos, carbon monoxide, , Ozone, fine dust, floating dust, and other bacteria, such as viruses, such as bacteria, indoor air pollution, so-called sick house syndrome containing the harmful substances are implanted, causing various environmental problems are considered to be a hotbed of harmful substances, In order to prevent this, it is necessary to develop a method of repairing a building that can suppress or eliminate the release of organic compounds.

On the other hand, the carbonation of concrete, which is one of the major deterioration phenomena in evaluating the durability of concrete structures, is caused by the strong alkaline loss of concrete caused by the penetration of erosive gas such as carbon dioxide (CO2) The carbonation is not harmful to the concrete structure itself but corrodes the reinforcing bars in the concrete due to the breakage of the passive film. Here, in order to form a passive film near the reinforcing bars, a strong alkaline environment of pH 11 or more is required (Carbonation) of concrete structures is promoted due to environmental factors such as increase in acid rain cost or increase in exhaust gas due to increase in traffic volume, corrosion of reinforcing steel is started due to destruction of passive film of concrete at pH lower than 10.4 Of concrete It is urgently required to develop a repair method capable of recovering the durability of the structure against the neutralization and improving the service life due to the fact that the passive film is destroyed due to the pH value being 8.2 to 10 according to the progress of carbonation.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above problems occurring in the prior art, and it is an object of the present invention to provide a method of repairing a building using an environmentally friendly silicate fireproof coating material capable of suppressing emission of organic compounds from various buildings, There is a purpose.

In order to achieve the above object, the present invention provides a method of manufacturing a damaged building, comprising: removing foreign matter and latency from a damaged building surface; Performing a maintenance operation on the building surface; Applying a permeable silicate primer to the surface of the building; Applying a silicate flame retardant coating material to the surface of the building; And applying a water repellent anti-fouling coating material to the surface of the building.

On the other hand, the present invention provides a method of manufacturing a damaged building, comprising the steps of: removing foreign matter and laitance from a damaged building surface; Performing a maintenance operation on the building surface; Applying a permeable silicate primer to the surface of the building; And applying a water repellent anti-fouling coating material to the surface of the building.

Wherein the permeability silicate primer is made comprises water, an acrylic copolymer, a potassium silicate, silane and teksa nolro, the silicate non-combustible coating is a silicate, a dispersing agent, a defoaming agent, TiO _2, a thickener, a calcium carbonate, a functional mineral and water, wherein the water repellent The anti-fouling coating material is characterized by comprising water, an acrylic copolymer, a potassium silicate, a silicone sponge, and a silane compound.

As described above, the method of repairing a building using the environmentally friendly silicate non-burnable coating material according to the present invention can improve the strength and durability of the concrete by restoring the alkalinity of the concrete by penetrating the silicate primer into the neutralized part of the building, The coating material prevents harmful chemicals from being released from concretes and prevents fungi and harmful bacteria from living in the concrete, and the durability can be prolonged through the water repellent anti-pollution coating material.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a first embodiment of a method for repairing a building using an environmentally friendly silicate non-burnable coating material according to the present invention.
2 is a flowchart showing a second embodiment of a method of repairing a building using the environmentally friendly silicate fireproof coating material according to the present invention.

Hereinafter, a method of repairing a building using the environmentally friendly silicate non-burnable coating material according to the present invention will be described with reference to the drawings.

[First Example ]

1 is a flowchart showing a first embodiment of a method for repairing a building using an environmentally friendly silicate non-burnable coating material according to the present invention.

The first embodiment of the method for repairing a building using the environmentally friendly silicate non-burnable coating material according to the present invention is for color coating on a building. The method includes the steps of removing foreign matter and laitance from the surface of the damaged building, Applying a permeable silicate primer to the surface of the building; applying a silicate fireproof coating to the surface of the building; and applying a water repellent anti-fouling coating to the surface of the building.

In the step of removing foreign matter and laitance, foreign matter such as whitened part, dust, grease and the like of the surface of the building and the lattens (generated at the time of curing after concrete is floated, A thin film of white which is formed) is removed by using a device such as a high-pressure washer or brush.

The repairing step is a process for smoothly fusing mortar, polyurethane, caulking material, or the like to a crack part or caulking material formed on the surface of a building.

The permeable silicate primer coating step is a process for preventing deterioration of concrete, restoring alkalinity and improving strength, durability and adhesiveness by penetrating a silicate primer into a neutralized part of a building concrete, 50 to 68% of the acrylic copolymer, 10 to 20% of the acrylic copolymer, 20 to 30% of the potassium silicate, 1 to 5% of the silane, and 0.01 to 1% of the tecanol.

In the case of the acrylic copolymer added to exert the adhesion strength, the effect is insufficient at a weight ratio of less than 10%. If it exceeds 20%, the adhesion strength is inhibited. In case of potassium silicate, the minimum amount for restoring the alkalinity of the concrete is 20 %, And when the maximum amount exceeds 30%, the total amount is not absorbed and the adhesion strength can be inhibited. On the other hand, in the case of silane, when the weight ratio is 1% or more, the strength of the primer coating film is increased. The strength is not increased. In addition, when it is added in the range of 0.01 ~ 1% by weight, it also causes the formation and strength of the acrylic copolymer to be formed and the strength of the coating film is prevented from being excessively mixed.

Experimental examples of the above-mentioned permeable silicate primer are as follows.

<Experimental Example 1-Alkali Recovery Test>

In order to verify the performance of the permeable silicate primer for the alkali recovery of concrete structures, 50mm × 50mm × 50mm cement mortar specimens were put into a neutralization accelerated tester to forcibly carbonate the specimens. Afterwards, the penetrating silicate primer was fully applied and tested for alkali recovery after curing for 3 hours.

KS M 0015 Spray the 1% phenolphthalein solution on the concrete surface by the method of 'Indicator Preparation for Chemical Analysis' to make the depth from the concrete surface to reddish color to the carbonation depth.

Kinds Carbonation depth (mm) Reference specimen 18 20 19 Primer application specimen 2 3 2

As shown in Table 1, when the permeable silicate primer was applied to the neutralized mortar, it was found that the neutralization recovery (PH increase) effect was excellent, and the passive film was formed again on the reinforcing adhesive portion while recovering the lost alkalinity, Restoring the durability of the structure.

<Experimental Example 2-Strength Test>

In order to test the effect of enhancing the permeability of silicate primer, 40mm × 40mm × 160mm cubic molds were prepared according to KS L 5105, and the cement mortar was molded. After 2 days of wet curing (20 ± 3 ℃, humidity of 90% The compressive strength of the specimens coated with the permeable silicate primer and the specimens before the application were tested after daily curing (20 ± 3 ℃), 21 days (20 ± 3 ℃, humidity 60 ± 10%).

Kinds Compressive strength (MPa) Reference specimen 23.2 22.1 22.8 Flexural strength (MPa) 7.2 7.4 7.5 Primer application specimen Compressive strength (MPa) 25.3 26.2 25.1 Flexural strength (MPa) 8.2 8.4 8.4

Experimental results As shown in Table 2, when the permeable silicate primer was applied, the compressive strength was improved by about 5 to 15% compared to the reference specimen, and the bending strength was improved by about 10%.

<Experimental Example 3 - Bond Strength Test>

In this experiment, a concrete specimen of 600 × 600 × 100 mm was prepared with a concrete with a compressive strength of about 50 MPa, and then the mortar was applied to a thickness of 5 mm. At a time of 7 days, 14 days, and 28 days, a 40 × 40 mm tensile jig ) Was attached and measured according to the adhesion test method of KS F 4715 (thin wall finish), JIS A 6909 (thin wall finish), and JIS A 6910 (thin layer finish).

Kinds
Bond strength (MPa) 7 days 14 days 28th Primer application 0.83 1.00 1.21 No primer application 0.77 0.88 1.04

As shown in Table 3, the adhesion strength of the test specimen coated with the permeable silicate primer was about 20% higher than that of the test specimen not coated with the primer.

In the step of applying the silicate non-burnable coating material, a silicate non-burnable coating material mainly composed of silicate of inorganic mineral system, TiO ₂ for giving transparency to paint and calcium carbonate of neutralizing agent is used, It does not emit noxious gas. It uses inorganic minerals of alkaline substance to prevent fungi and harmful bacteria. It also has a good ventilation structure and less inflating phenomenon, penetrates into inorganic material, The silicate fire-retardant coating material for this purpose is preferably a mixture of 20 to 30% by weight of a silicate based on the weight ratio and 0.5 to 30% by weight of a dispersant 0.5 ~ 1% and, as the anti-foaming agent _{0.5 ~ 1%, TiO 2 5} ~ 15%, functional mineral ( Soil, composed of a china clay, oxide, silica, charcoal, germanium, etc.) 1 to 5%, and a thickener and 1-3%, and 21-57% calcium carbonate, 15 to 25% water.

The silicate is an environmentally friendly, alkaline natural raw material that is odorless and pollution-free. It has an effect of preventing and sterilizing bacteria and fungi harmful to the human body. It is excellent in weatherability, durability and flame retardancy and penetrates into inorganic materials such as concrete and brick, Chemical bonding, thereby enhancing the surface strength of the substrate.

The TiO ₂ is a kind of minerals, which is added to foods and is harmless to human body. It is added to improve the tackiness of silicate. Therefore, even if it is contacted with a heat source and burned, it does not generate toxic gas and shows almost no signs of carbonization. It is possible to improve transparency, durability, tensile strength, tear strength and the like.

The functional mineral is an additional function of the silicate non-burnable coating material to provide far-infrared radiation, deodorizing effect, antifungal property, anion generation, and the like.

The thickening agent is a thickening agent for improving the viscosity. When the amount of the thickening agent is insufficient, the viscosity of the coating agent is lowered and the adhesion of the coating material is lowered. When the amount of the thickening agent is excessive, the coating material is likely to solidify, so that the total amount of the thickening agent is preferably limited.

The calcium carbonate is a carbonate of calcium and is produced from marble, calcite, beryllite, limestone, chalk, gypsum, shell, egg shell, coral and the like and is used as a neutralizing agent.

Hereinafter, a specific test example of the silicate fireproof coating material will be described.

<Experimental Example 4 - Nonflammability Test>

Test Items result Criteria Test Methods One 2 3 Non-combustible material Nonflammability test Mass reduction rate (%) 9.4 9.7 9.8 30 or less Ministry of Construction and Transportation Notice 2006-476 (KS F ISO 1182: 2004) Difference between peak temperature and final equilibrium temperature
(° C) 1.0 2.3 1.2 Should not exceed 20 Gas hazard test Downtime
(min: s) 14:33 14:48 - 9:00 or more Ministry of Construction and Transportation Notice 2006-476 (KS F 2271: 2006)

Table 4 shows the test results of the silicate nonflammable coating material at Korea Institute of Construction Materials Test according to the Ministry of Construction and Transportation Notification No. 2006-476 (KS F ISO 1182: 2004) and the Ministry of Construction and Transportation Notification No. 2006-476 (KS F 2271: 2006) In the nonflammability test, a concrete specimen with a diameter of 44 mm and a height of 50 mm was coated on the entire surface with 80um of paint and heated for 20 minutes. In the gas harmfulness test, the weight was 19g, Were measured. As shown in Table 4, the paint according to the present invention shows excellent results in each of the incombustibility test and the gas harmfulness test.

EXPERIMENTAL EXAMPLE 5 - Reflectance and gloss test [

Test Items result Test Methods Leadership (K.U) 102 KS M 5320- '97 Non-volatile matter (% in paint) 56 Solidification drying (minute) 30 45 °, 0 ° diffuse reflectance (%) 88 Gloss (60 °) 3 Softness (N.S) 4 Concealment rate 0.98

Table 5 shows the results of tests according to KS M 5320- '97, and it can be seen that the reflectivity and brightness are appropriate for the residential environment.

<Experimental Example 6 - Property Test>

Test Items result Test Methods Washability clear KS M 5320- '97 Freezing property clear Storage stability clear Water resistance clear Alkali resistance clear Workability clear The state of the dry film clear Repainting test clear smell clear Streakiness clear Condition in container clear

Table 6 shows the results of the test according to KS M 5320- '97, which confirms the excellent physical properties of the entire silicate flame-retardant coating material.

<Experimental Example 7 - far-infrared ray emission test>

Test Items Test result Test Methods Far Infrared Emission (40 ℃) Emissivity (5-20 um) 0.922 KICM-FIR-1005 Radiant energy (W / m ² ) 3.72x10 ²

Table 7 shows that the test result according to KICM-FIR-1005 shows the far-infrared ray emitting function, thereby reducing the heating energy and expecting a far infrared ray firming effect beneficial to the human body.

<Experimental Example 8 - Anion Test>

Test Items Test result Test Methods Anion (ION / cc) Blank 73 KICM-FIR-1005 Sample 615

Table 8 shows the results of the test according to KICM-FIR-1005. As a result, the function of releasing anions can be confirmed, thereby purifying contaminated air in the room, promoting metabolism or enhancing autonomic nervous control Effect can be expected.

<Experimental Example 9-Deodorization Test>

Test Items Deodorization test (NH ³ ) Elapsed time (minutes) Blank Concentration (ppm) Sample concentration (ppm) Deodorization rate (%) Test result 30 194 93 52.1 60 152 69 54.6 90 131 58 55.7 120 116 51 56.0 Test Methods KICM-FIR-1085

Table 9 shows that the results of the test according to KICM-FIR-1085 show that the cement poisoning and various odors can be absorbed and purified to provide a pleasant indoor environment.

<Experimental Example 10-Antifungal Test>

Test Items Antifungal test Period of culture test One week after 2 weeks Three weeks Four weeks Test result 0 0 0 0 Test Methods ASTM G-21

Table 10 shows that no mold was formed as a result of the test according to ASTM G-21.

<Experimental Example 11-Formaldehyde Emission Test>

Test Items result Test Methods Formaldehyde Emission (mg / L) 0.03 KS F 3217-'01

Table 11 above shows the results of the test according to KS F 3217 -'01, indicating that the formaldehyde component

It can be seen that it is released to the extent that it is totally irrelevant.

EXPERIMENTAL EXAMPLE 12 Flame Retardancy Test [

Test Items result Test Methods One 2 3 Flammability (Class 1) Surface test Melting over the entire thickness none none none KS F 2271-'98 Harmful transformation none none none Back crack (mm) 0 0 0 Remaining (seconds) 0 0 0 Fuming Coefficient (Ca) 3.6 0 0.6 Temperature Time Area (℃ .min) In three minutes 0 0 0 After 3 minutes 0 0 0 Base test Temperature difference (℃) -6 -12 -16

Table 12 shows that the flame retardancy test result according to KS F 2271- '98 shows a good measurement value which is hardly burned even in the event of a fire.

The step of applying the water repellent anti-fouling coating material is a process for forming a water repellent anti-fouling coating material by using a silicate, a silicon water repellent material and a silane compound, and coating the surface of the water repellent anti-fouling coating material in a finishing process, The antifouling coating preferably comprises 20 to 30% by weight of the reference, 20 to 40% of the acrylic copolymer, 5 to 20% of the potassium silicate, 10 to 20% of the silicon footwear, and 1 to 10% of the silane compound .

<Experimental Example 13-Property Test>

Test Items unit Reference value Results Water repellency test % 1 or less 0.6 Weatherability test
(Sunshine Carbon ars × 200 hours) % 2 or less 1.4 Breathability % Over 50 62 Whitening resistance - No abnormality clear Volume L Above Display 18.3

It can be seen that when a water repellent anti-fouling coating material having a specific gravity of 1.2 ± 0.1 is applied at a flow rate of 0.6 L / m 2 with a milky liquid phase, excellent results are obtained in water repellency, weather resistance, air permeability and whitening resistance as shown in Table 13, The characteristics of the anti - pollution coating material can prevent the environmental pollution during the repair of the building, and it can be expected to increase the durability by preventing deterioration of bricks, cement mortar, and concrete as well as improving the durability.

[Second Example ]

2 is a flowchart illustrating a method of repairing a building using an environmentally friendly silicate non-burnable coating material according to a second embodiment of the present invention.

The second embodiment of the method for repairing a building using the environmentally friendly silicate non-burnable coating material according to the present invention is applied to an old red brick building or a dry-bit building to coat the existing structure with transparency while saving the existing finish. Applying a permeable silicate primer to the surface of the building; and applying a water repellent anti-fouling coating on the surface of the building.

In the second embodiment of the present invention, the step of applying the silicate flame-retardant coating material is omitted in the repair method of the first embodiment, and the remaining steps, namely, the steps of removing the foreign matter and the laitance, performing the maintenance work, And the step of applying the silicate fire-retardant coating material and the step of applying the water-repellent anti-fouling coating material have been described above, so that a detailed description thereof will be omitted.

Claims (5)

Removing foreign matter and laitance from the damaged building surface;
Performing a maintenance operation on the building surface;
Applying a permeable silicate primer to the surface of the building;
Applying a silicate flame retardant coating material to the surface of the building;
And applying a water repellent anti-fouling coating on the surface of the building,
Wherein the permeable silicate primer comprises water, an acrylic copolymer, potassium silicate, silane, and Texanol. Removing foreign matter and laitance from the damaged building surface;
Performing a maintenance operation on the building surface;
Applying a permeable silicate primer to the surface of the building;
And applying a water repellent anti-fouling coating on the surface of the building,
Wherein the permeable silicate primer comprises water, an acrylic copolymer, potassium silicate, silane, and Texanol. delete The method according to claim 1,
Wherein the silicate non-burnable coating material comprises a silicate, a dispersant, a defoaming agent, TiO ₂ , a thickener, calcium carbonate, a functional mineral, and water. The method according to claim 1 or 2,
Wherein the water repellent anti-fouling coating material is composed of water, acrylic copolymer, potassium silicate, silicone sponge, and silane compound.

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