KR20100079869A - Fire resistive method of high strength concrete using a high density fire resistive sprayer - Google Patents

Abstract

PURPOSE: A fire resistant method of producing high-strength concrete is provided to prevent the spallation of the high-strength concrete by combining a concrete cement-based fire resistant sprayer with a gypsum board and to obtain excellent fire resistance which is required for high-rise buildings. CONSTITUTION: A fire resistant method of producing high strength concrete comprises a step of spraying the high-strength concrete with a coating, which is obtained by mixing a fireproof coating material and water with a ratio of 1:0.5-1.5, respectively and a step of attaching a gypsum board to the coating. The fireproof coating material comprises: 20-88.6 weight% of an inorganic binder; 5-40 weight% of a fireproof insulating material; 5-30 weight% of an inorganic fire retardant; 0.1-30 weight% of a binding filler; and 0.3-6 weight% of an admixture which is a functional additive.

Description

Refractory method using high strength concrete using a high density fire resistive sprayer

The present invention relates to a high-strength concrete refractory method, and more particularly in the high-rise building while preventing the explosion of high-strength concrete by combining a cement-based high-density refractory material for high-strength concrete prepared by mixing the refractory insulation aggregate and a functional material with a gypsum board. The present invention relates to a high-strength concrete fireproofing method using a high-strength concrete cement system high-density refractory coating material capable of expressing a required three-hour fire resistance performance.

Recently, as buildings are getting higher and larger, the use of high-performance concrete having high strength and high flow characteristics is increasing. For example, high-strength concrete is used in a very important part as a structural material for lower floor columns and beams of high-rise or large buildings. The structure of the high-strength concrete structure is densely formed by the hydrate. When the fire is subjected to high heat when the fire occurs, the explosion of phenomena occurs when the surface of the concrete peels off and falls off due to the increase in the internal vapor pressure due to pyrolysis of the hydrate. . In addition, exposing the reinforcing bar to reduce the strength of the structure ultimately collapses the building occurs.

The explosion of concrete occurs most of the time within 30 minutes as soon as the concrete receives a high heat, in this case, the user may not have enough time to evacuate the interior of the concrete structure has become a more serious problem.

As a method for solving the above problems, Korean Patent Application Nos. 2001-0077447 and 2002-0100363 propose a method of incorporating a predetermined amount of synthetic fibers having weak heat resistance when manufacturing concrete. This patent is to prevent synthetic fibers mixed inside the concrete first melt due to the high heat in the fire, and the melted place serves as a passage to release the internal water vapor pressure to the outside to prevent the explosion of the structure. However, there is a problem that the technique is not applicable to the already completed building, there is a disadvantage that is not at all effective in preventing the strength of the concrete itself exposed to fire.

As another method, Korean Patent Application Nos. 2003-0101195 and 2000-0009902 propose methods for applying to buildings using heat-insulated aggregates such as vermiculite and perlite. However, the above technique is effective in preventing the temperature rise of the structural material, but since cement, gypsum, etc. are used as the binder, the hydrate thereof is destroyed at a high temperature, making it difficult to secure its own strength.

In addition to the above-described prior art, many techniques for applying fireproof coating for preventing explosion of high-strength concrete using the excellent fireproof performance of the fireproof coating material, such as 'Korean fireproof board composition' of Korean Patent No. 10-0704056 However, in most cases, the surface hardness of the refractory coating material has a problem in that the single material alone does not act as a finishing material. In particular, when a three-hour fire resistance performance is required, such as a high-rise building, there is a limit in increasing the thickness of the fire-resistant coating material, and there is a problem in that a single material alone does not act as a finishing material.

On the other hand, conventionally fireproof coating technology of steel structure using gypsum board has been presented, but if it does not express enough fireproof performance, such as high-rise buildings require a three-hour fire-resistant performance is not satisfied, not only difficult to use, Bonding between the gypsum board and the refractory material coated on the surface of the concrete structure is difficult.

Therefore, the present invention has been proposed to solve the above problems, but the high density fireproof coating composition composite with a gypsum board, simply by using a fixed iron or adhesive to prevent the explosion of high-strength concrete, ultra-high layer Another object of the present invention is to provide a high-strength concrete fireproofing method using a high-density concrete cement system high density fireproof coating which can express the fire resistance performance required by a building for 3 hours.

The present invention for achieving the object as described above, the inorganic binder 20 ~ 88.6% by weight, fireproof insulation aggregate 5 ~ 40% by weight for exhibiting insulation and flame resistance (integrity), heat resistance And high strength concrete cement system composed of 5 to 30% by weight of inorganic flame retardant to reinforce flame retardancy, 0.1 to 30% by weight of a combined filler that plays a role of crosslinking between inorganic and flame retardant organic materials, and 0.3 to 6% by weight of functional admixture. It provides a fireproofing method of high-strength concrete, characterized in that the coating material mixed with a refractory coating material and water in a mixing ratio of 1: 0.5 to 1.5 is coated with a high-strength concrete to a predetermined thickness, and a gypsum board is attached on the blowing material.

According to the present invention having the above-described configuration, it is possible to increase the minimum coating thickness by being manufactured at a high density, and by using a high-strength concrete cement-based high-density refractory material and gypsum board composite surface strength is generated when the fire is generated by the fire It prevents the explosion and can satisfy the fire resistance performance for 3 hours in a skyscraper.

Hereinafter, with reference to the accompanying Figures 1 to 4 will be described an embodiment of the present invention;

Fireproof method using high-strength concrete cement-based high-density refractory coating material according to the present invention is to implement the three-hour fire resistance performance required in high-rise buildings while preventing the explosion of high-strength concrete.

First, high-strength concrete cement-based high-density fireproof coating material applied to the present invention is 20 ~ 88.6% by weight of the inorganic binder, fire-resistant insulation aggregate to exhibit heat insulation (insulation) and flame resistance (integrity) to the fire in the event of fire 5 ~ 40% by weight, 5 to 30% by weight of inorganic flame retardant to reinforce heat shielding and flame retardancy, 0.1 to 30% by weight of the combined filler that serves as crosslinking between inorganic and flame retardant organic matter, and 0.3 to 6% by weight of admixture as a functional additive It is characterized by the composition.

The present invention consisting of a mixture of the above components meets the conditions of the average temperature of 538 ℃, the maximum temperature of 649 ℃ or less at the Ministry of Land, Transport and Maritime Notice No. 2008-334.

Refractory coating material having the above composition is mixed with water to enable spraying (spray). At this time, the blending ratio of the fireproof coating material: water is blended in the fireproof coating material 1: water 0.5 to 1.5 so as to be in a sludge state to be coated with a predetermined thickness on the adhered surface (high strength concrete). In the present invention, the sludge density suitable for spraying is 0.6 to 0.8 kg / cm 3, and the refractory coating material mixed by the above-mentioned blending ratio is 0.3 to 1.3 kg / cm 3 after the spraying and curing drying. As described above, when the blending ratio of water is 0.5 or less with respect to the fireproof coating, it is difficult to spray, and when water is mixed 1.5 times or more, the required thickness cannot be satisfied.

Inorganic binder predominant in the composition of the present invention is at least one selected from among the alkaline active binder added an alkaline inorganic material to ordinary portland cement, alumina cement, blast furnace slag cement, hemihydrate gypsum, anhydrous gypsum, blast furnace slag, fly ash and meta kaolin It consists of the component which mixed the above.

The thermal insulation exhibited by the fireproof insulation aggregate mixed with the inorganic binder, which is the main body, means the ability of the building block member subjected to fire heating on one side to limit the temperature rise of the rear surface below a prescribed level. It means the ability of the partition member heated at to prevent the fire or the passage of hot gas or fire to the back.

The density of fireproof insulation aggregate in the present invention is 40 ~ 190kg / cm3, the flame retardancy of the fireproof insulation aggregate is suitable to the standards as a nonflammable material suitable for the notification of the Ministry of Construction and Transportation No. 206-476 (flame retardant performance criteria of building interior finishing material) .

Refractory insulating aggregate exhibiting such heat and flame resistance is composed of a component in which at least one selected from expanded vermiculite, unexpanded vermiculite, expanded perlite, unexpanded perlite, silica airgel, pulverized pumice, and pulverized pumice is mixed.

Brief description of each component used as the refractory insulation aggregate is as follows.

Vermiculite usually originates from Phlogpite, biotite, or chlorite, and trioctahedral vermiculite is commonly produced. The octahedral vermiculite, on the other hand, is also called soil vermiculite, which is also present in marine soils. The chemical composition varies depending on the source, but in general, the chemical formula has a form of (Mg, Fe) ₃ (Si, Al, Fe) ₄ O ₁₀ (OH ₂ ) 4 H ₂ O. Vermiculite is unique among many minerals, which is unique in water containing three waters: absorbed water, interlaminar water and crystallized water. It is fully hydrated at room temperature and has two layers of water and a small amount of Mg ⁺² , Ca ^{+ in} the middle of the crystal. ^{There is a bi} -exchangeable cation, and when it is heated, it exfoliates and expands like leeches due to the pressure of water vapor generated in the interlaminar water. Vermiculite has a very low specific gravity and excellent sound insulation and sound absorption, so it is widely used for building materials such as insulation, fireproof coating, lightweight concrete aggregate and sound absorbing material.It is also used as filler, extender, etc. It is also used as a packing material when packing.

The exchangeable cation of vermiculite is used as an excellent material for organic fertilizer production because it has the property of adsorbing organic matter. Recently, it is used as water, air purifier and catalyst by using the cation exchange capacity (CEC). Research is ongoing.

The specific gravity of unexpanded vermiculite is 640 ~ 960 kg / m ³ , and when it is heated to 870 ~ 1100 ℃, it is exfoliated 12 ~ 20 (volume) times to expand Vermiculite (specific gravity: 56 ~ 190 kg / m ³ ).

The characteristics of the vermiculite is sintering temperature of 1260 ℃, melting temperature of 1315 ℃ or more, latent heat 0.2Kcal / kg per ℃, PH 7 ~ 8, thermal conductivity 0.062 ~ 0.065W / m per ℃, heat resistance 1100 ℃.

Perlite is a natural glass called Pearl Stone, formed by rapid cooling as viscous lava (volcanic lava) or magma flow into the surface lake. The perlite is pearlescent and is usually gray or bluish, but also brown, blue or red. Minerals largely called perlite include Obsidian, Perlite, and Pitch Stone. These distinctions are distinguished by almost similar chemical composition, appearance, and amount of volatiles.

Expanded perlite is softened by sudden vaporization of gas and crystallized water in the particles of ferrite when the quenched water containing about 2-6% of the ore beneficiated is suddenly subjected to rapid quenching at about 870 ° C (760-1100 ° C). It expands about 20 times like popcorn, creating a lot of porosity in the matrix.

The characteristics of the perlite are roughly 2.2 ~ 2.4 g / cm ^3, ore density 950 ~ 1200 kg / cm ³ , expanded perlite density 40 ~ 115kg / m ³ , PH 7 ~ 8, softening temperature 890 ~ 1100 ℃, melting temperature 1280 ~ 1350 ℃, latent heat 840 Joule / kg per ℃.

Aerogels and amorphous fumed silicas have a density of 0.003 to 0.2 g / cm ³ . The specific surface area of aerogels is 600-1500m ² / g, and the amorphous fume silica Aerosil and Konasil 90-300m ² / g are used as raw materials for ultra-light, high-insulation products. It is done.

Aerogels are made of water glass (NaSiO ₃ .H ₂ O) as a sol-gel process.Amorphous fume silica is produced by hydrolysis in a flame of 1000 ℃ or higher formed of silane chloride (SiCl ₄ ) with oxygen and hydrogen. Is generated.

Pumice and pumice are also known as rock mass, pumice, and pumice of volcanic eruptions with a diameter of 4 mm or more. Appearance is small and light enough to float on water. When the magma is released into the atmosphere, the sudden decrease in pressure results in the escape of volatile components in the magma resulting in numerous pores. The pumice and pumice contain some semi-mineral but are mostly organic. Due to its light weight, small thermal conductivity, and fire resistance, it is used as aggregate for fireproof insulation panels and coating-related building materials, ceramic materials, and other heat shielding concrete. Since acid resistance is strong, it can be used as it is also for a sulfuric acid manufacturing apparatus.

The fireproof coating of the present invention is correlated with density. Accordingly, the preferred mixing ratio of the refractory insulation aggregate to the inorganic binder is 5 to 40% by weight. At this time, when added to 5% by weight or less of the horn heap ratio of the refractory heat insulating aggregate, there is no problem of flame retardancy, but the density is too high to reduce the thermal insulation. In addition, when added at 40% by weight or more, there is a problem in the density problem and the adhesion can be lowered and the price rise factor.

The inorganic flame retardant mixed in the fireproof coating of the present invention is not volatilized by heat and is incombustible such as undecomposed water (H ₂ O = OH + H), carbon dioxide (CO ₂ ), sulfur dioxide (SO ₂ ), hydrogen chloride (HCL), etc. Endothermic reaction by releasing gas improves the thermal and flame retardancy of fireproof coating.

The inorganic flame retardant of the present invention exhibiting such a performance is composed of a component in which at least one selected from aluminum hydroxide, magnesium hydroxide, calcium hydroxide, calcium carbonate, lithium carbonate, magnesium carbonate, borate, and potassium bicarbonate is mixed.

Brief description of each component used as the inorganic flame retardant is as follows.

Aluminum hydroxide (Al (OH) ₃ ) decomposes at about 230 ° C. to absorb about 460 cal / g of heat, and magnesium hydroxide (Mg (OH) ₂ ) decomposes at about 330 ° C. to about 380 cal / g of heat. Calcium hydroxide (Ca (OH) ₂ ) decomposes at about 450 ° C. to absorb about 230 cal / g heat, and calcium carbonate (CaCO ₃ ) decomposes at about 890 ° C. to heat about 420 cal / g. Absorbs, calcium aluminate (3CaO.Al ₂ O ₃ .6H ₂ O) decomposes at about 240 ° C. to absorb about 280 cal / g of heat, and zinc borate (ZnB ₄ O ₇ .7H ₂ O) is about 320 It decomposes at ℃ and absorbs about 150 cal / g of heat.

The following is the chemical formula of each component listed above

2Al (OH) ₃ --------> Al ₂ O ₃ + 3H ₂ 0 -460 g / cal

Mg (OH) ₂ ---------> MgO + H ₂ O -380 g / cal

Ca (OH) ₂ ----------> CaO + H ₂ O -230 g / cal

CaCO ₃ -----------> CaO + CO ₂ -420 g / cal

In view of the flame retardant properties of the aluminum hydroxide, the effect of suppressing the temperature rise of the material, the effect of lowering the surface heat dissipation calories is excellent, the effect of increasing the flash point at the time of mixing a large amount, prolongs the firing time The effect is excellent.

Looking at the characteristics of the aluminum hydroxide, the specific heat of 0.28 g / cal, low decomposition temperature and flame retardancy imparted a large amount of weakness to use. The mechanical properties and workability of the product can be reduced, water is produced by endothermic decomposition to obtain a flame retardant effect, and combustion is prevented by cooling by the generated water.

The properties of the magnesium hydroxide is excellent in the ignition point synergistic effect, small oxygen index synergistic effect, and the carbonization promoting effect when a small amount is mixed.

Magnesium hydroxide is characterized by a specific heat of 0.31 g / cal, moderate price, ease of use, low corrosiveness and non-toxic characteristics, and dilutes the concentration of gaseous dehydrated fuel by releasing water vapor during decomposition. Improves insulation through charcoal when heated and reduces smoke emissions during combustion.

As other inorganic flame retardants, antimony oxide, tin oxide, molybdenum oxide, zirconium compound, etc. may be employed.

The preferred mixing ratio of the above inorganic flame retardant is 5 to 30% by weight, but when added to 5% by weight or less, thermal insulation and flame retardancy are reduced, so that the fire resistance of the high temperature concrete cannot be maintained due to the fire resistance. May cause. In addition, when added in more than 30% by weight is expensive compared to other raw materials there is a problem that the economic efficiency is lowered.

In the composition of the present invention, the combined filler is composed of particles of inorganic and flame retardant organic materials (Fiber) and particles of self-extinguishing granules pulverized by foaming a high molecular material, and the role (function) is Controlling and bridging the release of sludge moisture according to the ambient temperature and humidity during the process of curing (curing) and drying the sludge after spraying fire-resistant coating material with combined fillers on high-strength concrete Prevents vibration and shocks by shaking or impact. The combined filler has a small bubble- and filament-shaped air layer formed by melting fibrous and polymer materials at low temperatures (100-300 ° C.) in case of fire. To solidify.

A binder filler having such characteristics is a mixture of at least one selected from pulp, calcium carbonate whisker, titanium dioxide whisker, pulverized expanded polystyrene, pulverized expanded polyurethane, polypropylene fiber, polyethylene fiber, acrylic fiber and polyvinyl alcohol fiber. It consists of one ingredient.

Brief description of each component used as the filler filling is as follows.

Pulp is a Cellulose insulation material which is made by cutting and grinding waste paper or cardboard and mixing a fireproofing agent such as boric acid and ammonium sulfate. About fifty percent of fibrous insulation is usually fibrin, and about 20 percent is made up of chemicals such as fire retardants. The characteristics of the pulp according to Power Resources Notification No. 82-19 (Cellulose thermal insulation type approval standard) density: 0.03 ~ 0.05 g / cm ³ , thermal conductivity: 0.038 Kcal / mh ℃, absorption (Weight criteria): Less than 15%, Combustion test: The criteria for acceptance are required.

The pulp that meets these criteria is 26.4% better than glass fiber in thermal insulation performance.

Calcium Carbonate (Whisker Calcium Carbonate) is used as a filler for industrial calcium carbonate (CaCO ₃ ). It is divided into synthetic calcium carbonate that sets the shape and size (needle of 1 to 2 μm in length).

Calcium carbonate whisker is <---------- Ca (OH) ₂ + CO _2> 10 ~ 20㎛ length, as a diameter 0.3 ~ 0.7㎛ manufacture is Ca (OH) ₂ the reaction of CO ₂ in water slurry CaCO ₃ + H ₂ O> to obtain a phosphoric acid impurity.

Physical properties of the calcium carbonate whiskers 2.86 g / cm ^{3 in} specific gravity, PH: 9 ~ 9.5, specific surface area: 7.0 m ² / g, oil absorption; 50 ml / 100 g.

Potassium Titanate Whisker (Potassium Titanate Whisker), called potassium titanate fiber, is 10 ~ 20m long and 0.3 ~ 0.7m in diameter, melting point is more than 1300 ℃, high infrared radiation rate, excellent heat resistance and low thermal conductivity at high temperature. It has an optimal feature, so it has been used as a thermal insulation material in the aerospace field in the United States, and as an alternative to asbestos, it is used for applications requiring high friction resistance, abrasion resistance, and heat insulation resistance.

The physical properties of the titanium dioxide whisker is true specific gravity: 3.3 g / cm ³ , apparent specific gravity: 0.22 ~ 0.25 g / cm ³ , specific surface area: 6 ~ 8 m ² / g, PH: 7 ~ 8, water content: 0.7% max.

Expanded Polystyrene is a granulated form of Styropor formed by foaming polystyrene <-(-C ₆ H ₆ -CH-CH _2- ) _n- > particles into a porous structure with pentane. It is a self-extinguishing combined filler that has excellent thermal insulation and cold insulation, and also has excellent shock absorbing and waterproofing properties due to low thermal conductivity.

Here, self-extinguishing is defined in KSM 3808 (foamed polystyrene insulation) as "combustion within 3 seconds is not extinguished and will not burn beyond the limit of combustion." This means that the flame must be flame retarded so that the light goes out.

The foamed polystyrene has a density of 30 kg / cm ³ or more of the styropol insulation board should have a thermal conductivity of less than 0.031 Kcal / mh ° C. (KSM 3808).

Expanded Polyurethane (Sponge) is a flame retardant bonding filler that crushes a molded foam product obtained by the reaction of a blowing agent, a catalyst, a stabilizer and a flame retardant based on polyol and diisocyanate. .

The foamed polyurethane has a thermal conductivity of 0.016 Kcal / mh ° C. at a density of 30 kg / cm ³ .

Polypropylene fibers, polyethylene fibers, acrylic fibers, and polyvinyl alcohol fibers have a length of 3 to 19 mm.

Sepiolite Excellent lightweight insulation, flame retardancy and low abrasion, and has a specific surface area of 230 ~ 380 m ² / g, and is used as filler and fireproof insulation. The chemical formula is Magnesium Silicate (Si ₁₂ Mg ₃ O ₃₂ .8H ₂ O), and the chemical properties are non-mineral dehydration below 100 ° C, bound water dehydration at 200-600 ° C, crystallization dehydration at 720-800 ° C, and 830 ° C. Enstetite (MgSiO ₃ ) is produced.

The preferred mixing ratio of the above-mentioned combined fillers is 0.1 to 30% by weight, in which case, when added to 0.1% by weight or less, cracks are generated during curing (curing) drying process after spraying the sludge mixed with the fireproof coating material and water. Deterioration of the function, when added in more than 30% by weight can cause a problem of lowering the density after the refractory coating packing and curing drying.

As an admixture in the composition of the present invention, a component containing 0.1 to 2% by weight of a thickener, 0.1 to 2% by weight of an air entrainer, and 0.1 to 2% by weight of an antifungal agent is used.

Here, the thickener is hydroxypropyl methyl cellulose, hydroxy ethyl cellulose, methyl cellulose, the air emulsifier is sodium lauryl sulfate, anionic surfactant of sodium alkyl sulfate, vinazole resin, benziimidazole-based It may be composed of at least one selected from antimicrobial agents, nitrile-based antibacterial agents, pyridine-based antibacterial agents, haloalkylthio-based antibacterial agents, organic iodine-based antimicrobial agents, and toothazole-based antimicrobial agents.

Brief description of each component used as the admixture is as follows.

The thickener is a nonionic cellulose ether which is dissolved in water, and has a function of an additive which gives water retention and viscosity, a binder, and a binder film forming agent. In some cases, ionic cellulose ethers such as CMC (Carboxyl Methyl Cellulose) are used. Thickeners (nonionic cellulose ethers) include methyl cellulose (MethylCellulose), hydroxypropyl methyl cellulose (Hydroxy Propyl Methyl Cellulose), hydroxypropyl cellulose (Hydroxy Propyl Cellulose), and hydroxypropyl, which are soluble in organic solvents and cold water. Hydroxy Propyl Ethyl Cellulose, Hydroxy Ethyl Cellulose, which is soluble in cold and hot water, and Ethyl Cellulose, which is soluble in organic solvents.

The thickener used in the high-strength concrete fireproof coating material of the present invention used a viscosity (Viscosity) of 15,000 ~ 40,000 c.p (centipoise).

Air entrainer is also known as AE (Air Entraining admixture), and is a kind of surfactant, and when mixing fireproof coating with water, it generates numerous independent air bubbles in sludge fireproof coating and pumps it. ) And the ability to improve the workability of the flow and resistance to freezing and thawing, and the microbubbles that are formed and maintained even after curing (cure) are resistant to the thermal insulation and flame retardancy of the flame in case of fire. Function

Surfactants as air emulsifiers are sodium lauryl sulfate and sodium alkyl, which have an anionic charge in aqueous solution due to their electrical properties (ionized ions) depending on the type of hydrophilic group in aqueous solution. Sodium Alkyl Sulfate, Resin Soap, Sulfuric Acid Ester and Sulfonate Anionic Surfactants, Vinsol Resin, Darex, Protex and Pozzolth Air Entrainment is used.

The purpose and function of antifungal agents is that molds generally survive everywhere in the natural world and grow rapidly if environmental factors such as temperature, humidity and nutrients are adequate. Therefore, mold can be generated and propagated in various building structures.In particular, in case of fireproof coating, the test method for mold development is introduced in ASTM G21 (Determining Resistance of Synthetic Polymeric Materials to Fungi), and the mold managed here Types include Aspergillus niger Penicillium funiculosum, Chetotomium globosum, Gliocladium virens, Oreobarsidium perulans pullulans) 5 types.

Anti-fungal chemicals should be stable to alkali and not reactive between raw materials because refractory cladding sludge is alkaline. It should be well dispersed during mixing, long lasting effect, nontoxic to human body and not cause environmental pollution. These drugs include benzimidazole-based antibiotics, nitrile-based antibiotics, pyridine-based antibiotics, haloalkylthio-based antibiotics, organic iodine-based antibiotics, thiazole-based antibacterial agents, tetramethylthiuram disulfide, and zinc ethylenebisdithiocarbamade tetrachromomethylsulfonate. Phonylpyridine is used.

In the mixing ratio of the above-mentioned admixtures, the thickener is mixed in an amount of 0.1 to 2% by weight, and when 0.1% by weight of the admixture is mixed, the fluidity decreases during pumping of the sludge mixed with the refractory coating material and water, resulting in problems in workability. When spraying, fire-resistant insulation aggregates fall out due to rebounding force, causing adhesion problems. If added at 2% by weight or more, the viscosity may be too high when mixed with water, causing problems in operation. Because of its high price, it is not economical.

When the mixing ratio of the air entrainer is 0.1 to 2% by weight, when 0.1% by weight is mixed, if there is no bubble generation or less than the standard, it is difficult to pump due to the role of micro bubbles in the sludge pumping pumping role If added in more than 2% by weight, the amount above the reference value is meaningless because the amount of air entrainer drug and the bubble generation is not proportional.

The mixing ratio of the anti-fungal agent is 0.1 to 2% by weight is mixed, when the 0.1% by weight is a high probability of mold generation and breeding, when added in more than 2% by weight is economical.

The high-density refractory coating material of the present invention prepared as described above is used as a refractory material of high-strength concrete in combination with a gypsum board, which will be described with reference to FIGS. 1 to 4.

In this embodiment, the refractory material (103) to the surface of the high-strength concrete 104 is sprayed to a thickness of 10mm, a plate of 12.5mm thick gypsum board 102 or a board of 15mm fireproof gypsum board attached to the fireproof coating material Present the structure.

At this time, in order to attach the gypsum board 102 as shown in Figure 1a to the fixed hardware 105 as shown in Figures 3 and 4 to the edge of the high-strength concrete 104, using a concrete tableting gun By fixing the concrete tableting nail 101 by fixing, and also by fixing a separate screw 106 between the gypsum board.

Here, the fixing iron 105 has a first surface (105a) in close contact with the surface of the high-strength concrete 104, as shown in Figures 3 and 4; It has a second surface 105b bent stepwise in the first surface 105a to accommodate the thickness of the refractory material (103). Therefore, the fixed iron 105 is the first surface (105a) is a high-strength concrete 104 is in close contact with the concrete tableting nail 101 is fixed by a concrete tableting nail 101, the refractory material (103) is applied to the step surface, thereon Gypsum board 102 is placed. Then, each corner of the gypsum board is fixed by the screw 106 to complete the construction.

As another example, when attaching without using the fixing iron 105, the refractory material (103) is sprayed with a 10mm thickness on the surface of the high-strength concrete (104) and plastered finish, and a plasterboard bond thereon ( 107) to attach a general gypsum board 102 or fireproof gypsum board.

In the present invention, in order to find out whether or not to satisfy the conditions that the average temperature of 538 ℃, the maximum temperature of 649 ℃ or less at the time of fire resistance test of Ministry of Land, Transport and Maritime Affairs notification No. 2008-334 with respect to the squirt material made of a mixture of the above components Fire resistance test was carried out at a ratio.

<Example and Comparative Example Composition>

division
Example 1 (% by weight) Example 2 (% by weight) Example 3 (% by weight) Fireproofing




Weapon Binder 42.0 42.0 70.0 Fireproof insulation aggregate 30.0 30.0 11.0 Inorganic Flame Retardant 18.0 18.0 13.0 Bonding filler 9.0 9.0 5.3 Admixture 1.0 1.0 0.7 system 100% 100% 100% Gypsum board Normal Attachment Method Fixed hardware Fixed hardware Gypsum bond

Experimental Example

In this experiment, in order to test the fire resistance performance of the general refractory coating material (Examples 1 and 2) and the refractory coating material (Example 3) applied to the present invention, a high strength having a design reference strength of 60 MPa of width x length 450 mm x 450 mm and height 800 mm After fixing the fixed hardware to facilitate securing the thickness of the refractory material to be plastered on the concrete test specimen using a concrete tableting gun, and sprayed the composition formed in Examples 1 and 2 to a thickness of 10mm The specimens were prepared by attaching a board of 12.5mm general gypsum board and a board of fireproof gypsum board (15mm). In addition, after spraying the composition prepared in Example 3 to 10mm to finish the plastering was prepared a specimen by attaching a fireproof gypsum board 15mm plate using a gypsum board bond thereon. The specimens were heated by the fire resistance test method of KS F 2271 and the final temperature of the specimens was measured after 3 hours.

division Example 1 Example 2 Example 3 Product density (g / cm 3) 0.3 0.3 0.8 Final temperature (℃) SH10-N: 495 SH10-FS: 386.3 SH10-FB: 299.3

As a result of examining the characteristics of the above Examples and Comparative Examples, it is 495 ℃ for the SH10-N in which the general gypsum board is fixed to the refractory material by fixing steel, and 386.3 ℃ in the case of SH10-FS fixing the fireproof gypsum board by the fixing hardware. In the case of SH10-FB with fireproof gypsum board fixed with gypsum bond, it was 299.3 ℃.

In addition, as shown in the graph of Figure 5, when the temperature in the furnace is 1100 ℃ or more, all of the specimens 1, 2, and 3 correspond to the condition that the average temperature of less than 538 ℃ in the fire resistance test No. 2008-334 of the Ministry of Land, Transport and Maritime Affairs 3 hours to meet the fire resistance.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

Figure 1a is a cross-sectional view of the first embodiment showing a state in which the high-strength concrete according to the present invention is a refractory material and gypsum board construction.

Figure 1b is a cross-sectional view of a second embodiment showing a state in which the high-strength concrete according to the present invention the refractory material and gypsum board construction.

Figure 2 is a perspective view of a state in which the high-strength concrete refractory material and gypsum board construction in accordance with the present invention.

3 and 4 are a cross-sectional view and a perspective view showing the configuration of the fixing hardware which is the main part of the present invention.

* Explanation of symbols for the main parts of the drawings

101: concrete tableting nail 102: gypsum board

103: refractory material 104: high strength concrete

105 Fixture 106: Screw

Claims (5)

As the main theme, inorganic binder 20 ~ 88.6% by weight, fireproof insulation aggregate 5 ~ 40% by weight to exhibit insulation and flame resistance, inorganic flame retardant 5 ~ 30% to reinforce heat and flame resistance %, 0.1 ~ 30% by weight of the combined filler that plays a role of crosslinking between inorganic and flame retardant organic matter, and 0.3 ~ 6% by weight of admixture, which is functional additive To cover the high-strength concrete to a predetermined thickness, the fireproof method of high-strength concrete, characterized in that the gypsum board is attached on the blowing material. The method of claim 1, The blowing material is fireproof method of high-strength concrete, characterized in that it is coated with a thickness of at least 10mm so as to satisfy the criteria of the average temperature of 538 ℃, the maximum temperature of 649 ℃ or less during the fire test of the Ministry of Land, Transport and Maritime Affairs No. 2008-334. The method according to claim 1 or 2, The fixed steel having a first surface closely adhered to the edge surface of the high-strength concrete and a second surface bent stepwise at the first surface to accommodate the thickness of the material to be sprayed by applying the fixed hardware to the corner portion of the high-strength concrete Refractory method of high-strength concrete characterized in that the cladding and plasterboard is combined. The method of claim 3, wherein The process of combining the refractory material and gypsum board with the fixing hardware After fixing the first surface of the fixed hardware to the edge of the high-strength concrete fixed with a concrete tableting nail, Covering the refractory material to the thickness corresponding to the step surface of the fixed steel, and put a gypsum board on it, Refractory method of high-strength concrete, characterized in that for fixing the fixed hardware and gypsum board by penetrating the screw to each corner of the gypsum board. The method according to claim 1 or 2, Refractory method of high-strength concrete, characterized in that by applying the gypsum board bond on the refractory material to be coated on the surface of the high-strength concrete and then attached by gypsum board on it.

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