KR100693859B1 - Concrete fireproof coating composition and concrete fireproof coating material made thereof - Google Patents

Abstract

Provided are a fireproof coating material composition for concrete which is applied on the surface of high performance concrete to prevent the spalling of concrete in case of a fire, a fireproof coating material for concrete constructed by using the composition, a panel for fireproof coating using the composition, and a fireproof adhesive containing the composition. The fireproof coating material composition comprises 20-40 wt% of an aluminosilicate-based binder; 15-35 wt% of an alkali silicate-based curing agent; 20-40 wt% of a fireproof heat insulating aggregate; and 0-5 wt% of a functional additive. Preferably the aluminosilicate-based binder is at least one selected from a shaft furnace slag powder, fly ash, metakaolin, fumed silica, kaolin-based mineral, calcium silicate, and calcium aluminate; and the functional additive is at least one selected from a frothing agent, a dispersant, a thickener, an organic fiber, and an inorganic fiber.

Description

Concrete fireproof coating composition and concrete fireproof coating material molded from the composition {Concrete Fireproof Coating Composition and Concrete Fireproof Coating Material made}

1 is a view showing an apparatus for measuring the fire resistance performance of the specimen prepared from the fireproof coating material composition for concrete according to the present invention,

2 is a graph showing the results of FIG.

The present invention relates to a fireproof coating material composition for concrete and a fireproof coating material for concrete molded from the composition. In particular, a heat-insulating aggregate, a fireproof aggregate, and a functional additive are added to a binder forming a polymer structure using an alumina-silicate inorganic binder. The present invention relates to a fire-resistant coating material for concrete and a fire-resistant coating material molded into the composition, which are prepared by curing the coating material and coating the high-performance concrete surface to prevent the thermal explosion of the high-performance concrete during a fire.

It is well known that the use of high performance concrete having high strength and high flow characteristics is increasing with the recent increase in the size and size of buildings. Among these high-performance concrete, high-strength concrete hardened bodies are densely formed by hydrates, and when the fire is subjected to high heat when fire occurs, the surface of the concrete peels off and falls off due to severe explosion and increase in internal vapor pressure due to pyrolysis of hydrates. The phenomenon occurs and the rebar is exposed, which leads to a decrease in the strength of the structure and ultimately collapses the building.

However, such high-strength concrete is used as a structural material for pillars and beams of high floors or lower floors of large buildings, and the thermal explosion of concrete occurs within 30 minutes as soon as the concrete receives high heat, and the user inside the concrete structure evacuates. This is a serious problem because you may not have enough time to do it.

As a countermeasure against the thermal explosion of high-performance concrete, a method of incorporating a predetermined amount of synthetic fiber, which is weak in heat resistance, has already been proposed. This is because synthetic fibers mixed inside concrete due to high heat during a fire first melt, and the melted sites serve as a passage for releasing internal water vapor pressure to the outside.

However, this method is impossible to apply to the high-strength concrete that has already been constructed, there is a limit that can not be a countermeasure against the existing large-scale high-rise buildings.

In addition, in order to secure the fire resistance of steel structures, steel structures are already widely applied to fire-resistant coating materials for steel structures with light aggregates such as ferrite, vermiculite, and styrofoam fillers. Although there is an effect, its own strength performance is so weak that it is difficult to cope with concrete bursting.

Meanwhile, Korean Patent Application No. 10-2001-0077447 and Korean Patent Application No. 10-2002-0100363 propose a fundamental solution by incorporating fibers into concrete, but cannot be applied to an already completed building. There is a problem, and Korean Patent Application No. 10-2003-0101195 and Korean Patent Application No. 10-2000-0009902 are applied to a building by using an insulating aggregate such as vermiculite and perlite. By using the hydration product is destroyed at high temperature there is a problem that difficult to secure its own strength. The decomposition temperature of these hydration products is 100 ~ 200 ℃ for hydrated gypsum, gypsum hydration products, 100 ~ 200 ℃ for cement hydration products Ethrinite or CSH gel, 400 ~ 600 ℃ for calcium hydroxide As a result, it loses its properties as a cured body and has some performance to withstand the flame. However, it does not have strength enough to withstand the internal water vapor pressure and thus does not prevent the thermal expansion phenomenon.

Therefore, an object of the present invention is to solve such a problem, by using alumina-silicate-based inorganic binders to prepare a coating material that is cured by adding a heat insulating aggregate, a fireproof aggregate and a functional additive to the binder to form a polymer structure high-performance concrete The present invention provides a fireproof coating composition for concrete and a fireproof coating material for concrete molded from the composition, which is applied to the surface to prevent the thermal explosion of high performance concrete in case of fire.

The present invention for achieving the above object, in the aluminosilicate-based fireproof coating composition for the purpose of forming an inorganic polymer structure of Al-Si, in order to form an aluminosilicate inorganic polymer structure 20-40 wt% of the binder, It is achieved by a fireproof coating composition for concrete, characterized in that the composition is mixed with an alkali silicate-based curing agent 15 ~ 35wt%, fireproof insulation aggregate 20 ~ 40wt%, functional additives 0 ~ 5wt%.

Here, the aluminosilicate-based binder is preferably a mixture of at least one or two or more of blast furnace slag powder, fly ash, metakaolin, silica fume, kaolin minerals, calcium silicate minerals, calcium aluminate minerals.

      In addition, it is effective that the aluminosilicate-based binder is prepared by mixing the alumina and the silica component in a molar ratio of 1: 2 to 5.

The alkali silicate-based curing agent according to the present invention is at least one of sodium silicate, potassium silicate, lithium silicate, sodium carbonate, potassium carbonate, lithium carbonate, sodium hydroxide, potassium hydroxide, lithium hydroxide, silicide It is preferable that any one or two or more kinds thereof are mixed, and the alkali silicate-based curing agent is a solution in which the mixed composition is dissolved in water so that the molar ratio of silica, potassium, and sodium is 1: 0.1 to 1.5: 0.1 to 2.5, and its specific gravity is 1.1 to It is effective that 1.8 and viscosity are 1-2200cps.

In addition, the refractory insulation aggregate is 55 ~ 100wt% of one or two or more of the heat insulating aggregate mixed with one or more of perlite, vermiculite, hollow glass and ocher, mica, glass powder, alumina powder It is preferably mixed with a ratio of 0 to 45wt%, and as the functional additive, it is effective to mix at least one or two or more of a foaming agent, a dispersant, a thickener, an organic fiber, and an inorganic fiber.

On the other hand, the composition of claim 1 is achieved by a fire-resistant coating material for concrete, characterized in that the construction in the field by any one method of plastering, spraying.

In addition, it is possible to achieve a fireproof coating panel molded from a fireproof coating composition for concrete, characterized in that the composition of claim 1 is molded in the form of a panel by any one of extrusion molding, compression molding, and mold molding.

It is also possible to prepare a fire resistant adhesive for adhesion and coating of the refractory material by applying the composition of claim 1.

Hereinafter, described in detail the preferred embodiment of the present invention.

1 is a view showing an apparatus for measuring the fire resistance performance of the specimen prepared from the fireproof coating composition for concrete according to the present invention, Figure 2 is a graph showing the results of FIG.

Alumino silicate binder 20 ~ 40wt% to form an aluminosilicate inorganic polymer structure, It is characterized in that the composition is mixed with an alkali silicate-based curing agent 15 ~ 35wt%, refractory insulation aggregate 20 ~ 40wt%, functional additives 0 ~ 5wt%.

The aluminosilicate binder is characterized in that any one or two or more of blast furnace slag powder, fly ash, metakaolin, silica fume, kaolin minerals, calcium silicate minerals, calcium aluminate minerals.

      The aluminosilicate binder is characterized in that the alumina and the silica component is mixed and composed so that the molar ratio of 1: 2-5.

The alkali silicate-based curing agent is any one or two of sodium silicate, potassium silicate, lithium silicate, sodium carbonate, potassium carbonate, lithium carbonate, sodium hydroxide, potassium hydroxide, lithium hydroxide, silicide It is characterized by mixing above.

The alkali silicate-based curing agent is a mixture of the composition so that the molar ratio of silica, potassium, sodium is 1: 0.1 to 1.5: 0.1 to 2.5 in water, its specific gravity is 1.1 to 1.8, the viscosity is 1 to 200cps.

Refractory thermal insulation aggregate is 55 ~ 100wt% and 0, respectively, in which one or two or more types of insulation aggregate mixed with perlite, vermiculite and hollow glass and one or more of ocher, mica, glass powder, and alumina powder are mixed. Characterized in that the mixture at a ratio of ~ 45wt%.

The functional additive is characterized in that any one or two or more of the foaming agent, dispersant, thickener, organic fiber, inorganic fiber.

The composition of claim 1 is characterized in that the fire-resistant coating material for the concrete was constructed by any one of the method of plastering and spraying the composition in the field.

The composition of claim 1 is characterized in that the refractory dosing panel is molded into a refractory coating composition for concrete molded into a panel form by any one of extrusion molding, compression molding, molding.

It is also possible to prepare a fire resistant adhesive for adhesion and coating of the refractory material by applying the composition of claim 1.

The concrete fireproof coating material composition according to the present invention can be used by coating on the high-strength concrete surface is mixed and installed in the field with 5 ~ 100mm, preferably 20 to 50mm. If the thickness of the coating is less than 5 mm, it is impossible to secure fire resistance to prevent the thermal explosion. If the coating thickness is greater than 100 mm, the coating is dropped by its own weight, and thus construction properties cannot be secured.

In another aspect, the present invention may be molded in a panel form by any one method of extrusion molding method, compression molding method or steam curing method, it can be installed on the high-strength concrete surface of the construction.

<Example and Comparative Example>

material Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 cement - - - 45 25 gypsum - - - - 20 Aluminosilicate Binder 28 33 38 - - Alkali silicate hardener 35 30 25 - - water - - - 18 18 Fireproof insulation aggregate 35 35 35 35 35 Functional additive 2 2 2 - - system 100 100 100 100 100

Here, the aluminosilicate-based binder was prepared by mixing alumina and silica in a molar ratio of 1.0: 2.6, and the alkali silicate-based curing material was mixed with silica, potassium, and sodium in a molar ratio of 1.0: 0.7: 0.8 to a specific gravity of 1.34 and viscosity of 1.8. Prepared.

Experimental Example

In order to test the fire resistance performance of the concrete fireproof coating material composition according to the present invention, a specimen was prepared by coating the composition prepared in the above examples so that the thickness of 40 × 13.6 mm, 40 mm thick cement plate 40 mm thick In addition, a comparative sample specimen having a width of 40 × 13.6 mm and a thickness of 40 mm was prepared using the composition prepared in the comparative examples. The specimens were insulated with refractory to direct the surface temperature to 1100 ~ 1200 ℃ (see Figure 1), and after 3 hours the final back temperature of each specimen was measured (see Figure 2).

In addition, in order to test the acid resistance of the concrete fire-resistant coating material composition according to the present invention, a specimen of a cube of 40 × 40 × 40 mm was prepared using the composition prepared in the above Examples and Comparative Examples, 50% sulfur The weight loss rate was measured by immersion in an aqueous solution for 72 hours, and the results for the above tests are shown in Table 1.

Properties Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 liquidity ○ ○ △ △ × 28 days strength (㎏f / ㎠) 110 90 88 20 21 Final back temperature (° C; see Figure 2) G1: 354 G2: 348 G3: 305 OPC: 536 OG: 485 Appearance after heating Good Good Good Attachment surface drop Crack destruction % Reduction in 50% sulfuric acid solution 2.1 1.8 2.2 Destruction (Unmeasurable) Destruction (Unmeasurable)

(○: Good, △: Normal, ×: Poor)

According to the present invention as described above, by providing a high-performance concrete interior and coating material cured by mixing the refractory insulation aggregate and the functional additive in the aluminosilicate-based binder for forming the aluminosilicate inorganic polymer structure, it has already been constructed It can be applied to large-scale high-rise buildings, and since the cured product of the alumina-silicate inorganic binder is not a hydration product but a binder having an inorganic polymer-type bond of Al-Si, the risk of deformation and destruction at high temperatures is extremely reduced. In addition, it has the effect of excellent in acid resistance by having a polymer structure.

Claims (10)

In the fireproof coating composition for aluminosilicate concrete which aims at forming the inorganic polymer structure of Al-Si, Alumino silicate binder 20 ~ 40wt% to form an aluminosilicate inorganic polymer structure, Fireproof coating composition for concrete, characterized in that the composition is mixed with an alkali silicate-based curing agent 15 ~ 35wt%, fireproof insulation aggregate 20 ~ 40wt%, functional additives 0 ~ 5wt%. The method of claim 1, The aluminosilicate-based binder is blast furnace slag fine powder, fly ash, metakaolin, silica fume, kaolin-based minerals, calcium silicate minerals, calcium aluminate minerals, including one or two or more kinds of mixtures of fireproof coatings for concrete.       The method of claim 2,       Alumino silicate-based binder is a fireproof coating composition for concrete, characterized in that the alumina and the silica component is mixed and formulated in a molar ratio of 1: 2 to 5. The method of claim 1, The alkali silicate-based curing agent is any one or two of sodium silicate, potassium silicate, lithium silicate, sodium carbonate, potassium carbonate, lithium carbonate, sodium hydroxide, potassium hydroxide, lithium hydroxide, silicide A fireproof coating composition for concrete comprising a mixture of the above. The method of claim 4, wherein    The alkali silicate-based curing agent is a mixture of the silica, potassium, sodium so that the molar ratio of 1: 0.1 ~ 1.5: 0.1 ~ 2.5 dissolved in water, its specific gravity is 1.1 ~ 1.8, the viscosity is 1 ~ 200cps, characterized in that Fireproof coating composition for concrete. The method of claim 1, Refractory thermal insulation aggregate is 55 ~ 100wt% and 0, respectively, in which one or two or more types of insulation aggregate mixed with perlite, vermiculite and hollow glass and one or more of ocher, mica, glass powder, and alumina powder are mixed. Fireproof coating composition for concrete comprising a mixture of ~ 45wt%. The method of claim 1, The functional additives include a foaming agent, a dispersing agent, a thickener, organic fibers, inorganic fibers, any one or two or more kinds of mixed fireproof coating composition for concrete. The fire-resistant coating material for concrete, characterized in that the composition of claim 1 is constructed by any one method of plastering or spraying on the spot. The fireproof coating panel molded in a fireproof coating composition for concrete, characterized in that the composition of claim 1 is molded in the form of a panel by any one of extrusion molding, compression molding, mold molding. Refractory adhesive for adhesion and coating of the refractory material prepared by the composition of claim 1.

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