KR102539051B1 - Nonflammable construction method using fire retardant panel - Google Patents

Abstract

The present invention includes a pretreatment step of flattening the surface of a concrete repair/reinforcement surface; A composite panel attachment step of attaching a composite panel to a concrete repair/reinforcement surface using a first adhesive; A first fixing step of fixing the composite panel to a concrete repair/reinforcement surface using an anchor; A fire resistant panel attachment step of attaching a fire resistant panel on a composite panel using a second adhesive; A second fixing step of fixing the fireproof panel to the composite panel using anchors; and a finishing step of finishing the surface of the fireproof panel, wherein the composite panel is an ECS (Evolutionary Curing System) composite material panel in which an organic-inorganic composite reinforcing material is located inside a fiber reinforced panel (FRP) sheet or a polymer layer. It relates to a non-combustible construction method using a fireproof panel.

Description

Nonflammable construction method using fire retardant panel}

The present invention relates to an incombustible construction method using a fireproof panel, and more particularly, to a noncombustible construction method using a noncombustible fireproof panel.

In general, concrete or concrete structures (eg, bridges, retaining walls, tunnels, general apartments, underground parking lots of buildings, houses or building walls, etc.) are subject to cracks, corrosion, peeling, As a result, exposure of the reinforcing bar, whitening, and sagging phenomena occur. In particular, since cracks that progress in this way may cause the worst situation such as collapse, repair and reinforcement are performed to ensure the safety of the structure.

Reinforcement of such a concrete structure can be roughly divided into restoring the loss of strength and increasing the strength of the structure to suit the purpose of use. First, in order to repair and reinforce a cracked structure, the cause of the loss of strength must be identified by investigating the structure in advance. However, it is necessary to determine a suitable reinforcement method to sufficiently compensate for the cause.

In particular, the occurrence of initial defects, surface peeling or cracks facilitates the propagation of deterioration factors and accelerates the progress of deterioration. Therefore, in order to secure the stability and performance of reinforced concrete structures, repair/reinforcement should be carried out at the early stage of deterioration to prevent deterioration. It is necessary to suppress the progress and improve the durability performance.

Among the repair and reinforcement methods of concrete structures, there are steel plate reinforcement method and fiber plate reinforcement method among the construction methods using plates.

The steel plate reinforcement method described above has been widely applied to actual structures because of its proven reinforcement effect and workability, but has problems in terms of workability and maintenance due to the heavy weight of the steel plate and vulnerability to corrosion.

In particular, since existing repair and reinforcement materials are vulnerable to fire, it is necessary to develop a new construction method capable of improving the fire resistance of repair and reinforcement materials used for repair and reinforcement of concrete structures.

Registered Patent No. 10-2178078 (registered on 2020.11.06) Registered Patent No. 10-1779968 (registered on September 13, 2017)

In the present invention, it is intended to provide a non-combustible construction method using a non-combustible fireproof panel.

An embodiment of the present invention for achieving the above object is a pretreatment step of flattening the surface of the concrete repair/reinforcement surface; A composite panel attachment step of attaching a composite panel to a concrete repair/reinforcement surface using a first adhesive; A first fixing step of fixing the composite panel to a concrete repair/reinforcement surface using an anchor; A fire resistant panel attachment step of attaching a fire resistant panel on a composite panel using a second adhesive; A second fixing step of fixing the fireproof panel to the composite panel using anchors; It relates to a non-combustible construction method using a fireproof panel comprising a; and a finishing step of finishing the surface of the fireproof panel.

The composite panel may be a fiber reinforced panel (FRP) sheet or an evolutionary curing system (ECS) composite material panel in which an organic-inorganic composite reinforcing member is positioned inside a polymer layer.

The polymer layer may be formed of a polymer composition including a phenol resin, a flame retardant, a flame retardant capsule, a filler, and a curing agent, and the organic/inorganic composite reinforcing material may include a thermosetting polymer, inorganic fibers, organic fibers, and organic additives.

The fireproof panel may be a fiber-reinforced cement panel or a metal panel.

The fiber-reinforced cement panel may be made of a mortar composition containing 15 to 38 parts by weight of cellulose fiber, 12 to 26 parts by weight of a polymer, and 5 to 20 parts by weight of a filler, based on 100 parts by weight of cement.

The cellulose fibers may be nano-cellulose fibers surface-treated with epoxy silane.

The mortar composition may further include additives.

The non-combustible construction method using the non-combustible fireproof panel of the present invention has a first-class non-combustible property and can prevent fire occurrence and fire propagation.

Prior to a detailed description of the preferred embodiments of the present invention below, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and meanings consistent with the technical spirit of the present invention. and should be interpreted as a concept.

Throughout this specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

Throughout this specification, “%” used to indicate the concentration of a specific substance is (weight/weight)% for solid/solid, (weight/volume)% for solid/liquid, and liquid (weight/volume)%, unless otherwise specified. /liquid means (volume/volume)%.

In each step, the identification code is used for convenience of description, and the identification code does not explain the order of each step, and each step may be performed in a different order from the specified order unless a specific order is clearly described in context. there is. That is, each step may be performed in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

The present invention will be described in detail with reference to the embodiments and drawings of the present invention. These examples are only presented as examples to explain the present invention in more detail, and it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples. .

In addition, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of skill in the art to which this invention belongs, and in case of conflict, this specification including definitions of will take precedence.

In order to clearly explain the proposed invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification. Also, a “unit” described in the specification means one unit or block that performs a specific function.

Hereinafter, look at an embodiment of the present invention. However, the scope of the present invention is not limited to the following preferred embodiments, and those skilled in the art can implement various modified forms of the contents described herein within the scope of the present invention.

The present invention relates to a non-combustible construction method using a composite panel and a fireproof panel for repair and reinforcement of a structure.

A nonflammable construction method according to an embodiment of the present invention includes a pretreatment step of flattening the surface of a concrete repair/reinforcement surface; A composite panel attachment step of attaching a composite panel to a concrete repair/reinforcement surface using a first adhesive; A first fixing step of fixing the composite panel to a concrete repair/reinforcement surface using an anchor; A fire resistant panel attachment step of attaching a fire resistant panel on a composite panel using a second adhesive; A second fixing step of fixing the fireproof panel to the composite panel using anchors; and a finishing step of finishing the surface of the fireproof panel.

First, the pretreatment step is a step of flattening the surface of the concrete repair/reinforcement surface. In this step, foreign substances attached to the surface of the concrete repair/reinforcement surface may be removed, uneven parts may be repaired and flattened, rust may be removed from corroded parts of the reinforcing bar, and rust prevention may be performed. After this process, when the concrete repair/reinforcement surface becomes flat, high-pressure washing water can be sprayed to completely remove foreign substances or deteriorated parts on the surface. .

Next, a composite panel attachment step of attaching the composite panel to the concrete repair/reinforcement surface using the first adhesive is performed.

The composite panel is provided to reinforce physical properties such as durability and strength of a concrete repair/reinforcement surface, and may be a fiber reinforced panel (FRP) sheet or an evolutionary curing system (ECS) composite material panel.

The ECS composite material panel is a composite panel in which organic-inorganic composite reinforcing materials are located inside the polymer layer, and has excellent physical properties such as bending strength, tensile strength, and incombustibility, so that the durability of the structure can be extended. Composite material panels have the advantage of weakening or preventing the propagation of fire in the event of a fire because they have fire resistance properties including fire resistance materials.

Here, fireproof materials collectively refer to materials that have been tested with KS F2271 in accordance with the provisions of Articles 5 to 7 of the Evacuation Rules and have obtained flame retardant grade 1, flame retardancy grade 2, and flame retardancy grade 3, respectively, and are non-combustible materials and semi-non-combustible materials, respectively. , called flame retardant materials. Specifically, the non-combustible material (class 1 flame retardant) is a material that does not burn, and when heated for 20 minutes (750 ° C), generates little heat (less than 50 ° C), and after heating for 10 minutes (305 ° C), there is no residual flame ( Less than 30 seconds) refers to materials, and semi-incombustible materials (flame retardant class 2) are materials that do not burn, and there is no residual flame after heating (305 ℃) for 10 minutes (less than 30 seconds), and rats left in the combustion gas of the material A refers to a material that is active for more than 9 minutes, and a flame retardant material (flame retardant class 3) is a material that is more difficult to burn compared to wood, which is a combustible material, and there is no residual flame after heating (235 ℃) for 6 minutes (less than 30 seconds), and the material It refers to a material that allows a rat left in the burning gas to be active for more than 9 minutes.

The ECS composite material panel is formed in a structure in which an organic-inorganic composite reinforcing material is located inside a polymer layer. The polymer layer is formed of a polymer composition including a phenol resin, a flame retardant, a filler, and a curing agent, and the organic-inorganic composite reinforcing material is formed of an organic-inorganic composite composition, and the organic-inorganic composite composition includes inorganic fibers and organic fibers.

Therefore, the ECS composite material panel has excellent physical properties such as bending strength, tensile strength, and adhesive strength, and is suitable as a repair and reinforcement material having fire resistance performance because both the polymer layer and the organic-inorganic composite reinforcing material have fire resistance properties.

The organic-inorganic composite reinforcing material is formed of an organic-inorganic composite composition containing inorganic fibers. These organic-inorganic composite reinforcing materials have the advantage of improving workability and compatibility because they can reduce the weight of ECS composite panel while increasing its strength due to its low specific gravity. , excellent chemical resistance and excellent bending properties.

The organic-inorganic composite composition includes a thermosetting polymer, inorganic fibers, organic fibers, and organic additives. Specifically, 100 to 220 parts by weight of inorganic fibers, 10 to 25 parts by weight of organic fibers, and 4 to 12 parts by weight of organic additives are included based on 100 parts by weight of the thermosetting polymer, and the thermosetting polymer is melted and the inorganic fibers, organic fibers and organic additives are mixed. After mixing, it can be cured to obtain an organic-inorganic composite reinforcing material.

The thermosetting polymer expresses the basic physical properties of the organic-inorganic composite reinforcing material and has a function of binding fibrous materials to each other. It is cured by heat during processing with the organic-inorganic composite reinforcing material and there is no shape deformation even when heated thereafter, so whether or not a fire occurs. It has the advantage of maintaining the shape of the existing composite reinforcement.

As the thermosetting polymer, various well-known thermosetting polymers such as polyester resins, epoxy resins, and amino resins may be used, and preferably, epoxy resins may be used. Examples of the epoxy resins include bisphenol A-type epoxy resin and bisphenol F-type epoxy resin. , novolak epoxy resins, modified dimer acid epoxy resins, modified rubber epoxy resins, modified urethane epoxy resins, or at least one or more epoxy resin mixtures selected from these may be used.

The inorganic fiber is added to impart fire resistance to the organic-inorganic composite reinforcing material and to improve physical properties such as heat resistance, strength, chemical resistance, and corrosion resistance. Glass fiber may be used as the inorganic fiber, and the inorganic fiber is a thermosetting polymer. It may be included in 100 to 220 parts by weight based on 100 parts by weight.

When the content of inorganic fibers is less than 100 parts by weight, the above-mentioned effect is insignificant, and when the content of inorganic fibers exceeds 220 parts by weight, the content of inorganic fibers is excessive, which may cause problems in that inorganic fibers are not sufficiently combined and detached. The problem of lowering the flexural strength of the stiffener may occur.

The organic fiber is added to improve the bending properties of the organic-inorganic composite reinforcing material, and may be included in 10 to 25 parts by weight based on 100 parts by weight of the thermosetting polymer, and when included in less than 10 parts by weight, the effect of improving the bending properties is insignificant And, if it exceeds 25 parts by weight, the compressive strength of the organic-inorganic composite reinforcing material may be reduced and fire resistance may be deteriorated, so it is preferably included within the above-described weight range.

As the organic fiber, preferably, an aromatic polyimide fiber having excellent self-strength and bending properties may be used.

The organic additive is a component added to increase the compressive strength of the organic-inorganic composite reinforcing material. Thiourea can be used as an organic additive, and thiourea not only improves compressive strength but also accelerates the initial curing of thermosetting polymers when manufacturing organic-inorganic composite reinforcing materials, thereby preventing inorganic and organic fibers from settling or aggregating in thermosetting polymers Uniform physical properties can be expressed in the entire area of the organic-inorganic composite reinforcing material.

Organic additives having these functions are preferably 1-(2-pyridyl)-2-thiourea, 1-benzoyl-2-thiourea, 1-acetyl-2-thiourea and 1-(2-tetrahydrofurea). At least one thiourea selected from the group consisting of furyl)-2-thiourea may be used.

The organic additive may be included in an amount of 4 to 12 parts by weight based on 100 parts by weight of the thermosetting polymer, and when the amount of the organic additive is less than 4 parts by weight, the compressive strength improvement effect is insignificant, and when the amount exceeds 12 parts by weight, the organic-inorganic composite reinforcing agent Since there is a problem of reducing the fire resistance performance and adhesive strength with the polymer layer, it is preferably included within the above-described weight range.

Such an organic-inorganic composite reinforcing material is located inside the polymer layer to form the ECS composite material panel of the present invention.

The polymer layer is formed of a polymer composition containing a phenol resin, a flame retardant, a filler, and a curing agent, and the organic-inorganic composite reinforcing material is impregnated into the melted polymer composition and then cured to form an ECS composite material in which the organic-inorganic composite reinforcing material is located inside the polymer layer A panel may be formed.

Specifically, the polymer composition includes 100 parts by weight of a phenol resin, 30 to 85 parts by weight of a flame retardant, 10 to 20 parts by weight of a filler, and 3 to 8 parts by weight of a curing agent to form a polymer layer having excellent flame retardancy, flexural strength and tensile strength. there is.

The phenolic resin has excellent heat resistance, flame retardancy, and electrical insulation, and is inexpensive to produce compared to other polymer resins, so it is economical. When phenolic resin is mixed with a phosphorus-based flame retardant to be described later and used, it forms char in the event of a fire. When char is formed, the drip phenomenon where the burning part of the combustible falls is prevented, so the stability of the structure in case of fire can be improved. there is. Phenol resin has an advantage of excellent fire safety because it has a higher char formation rate than polycarbonate resin or polyphenylene ether resin.

In addition, since the phenolic resin has a high limiting oxygen index of 18 to 60, it is possible to reach the nonflammable target index with a relatively small content. A novolac-type phenolic resin may be used as the phenolic resin, and in particular, a novolac-type phenolic resin having a molecular weight of 1,000 to 4,000 Mw prepared by phenol and formaldehyde in a molar ratio of 1:0.8 under acidic conditions is used. desirable.

The flame retardant slows the ignition of a polymeric material having an easy-to-combustible property and prevents the expansion of combustion, and may include at least one of a phosphorus-based flame retardant and a metal hydroxide flame retardant.

Preferably, both a phosphorus-based flame retardant and a metal hydroxide flame retardant may be included, and they may be mixed in various ratios as needed, but it is preferable to use a weight ratio of 35 to 50% by weight of the phosphorus-based flame retardant and 50 to 65% by weight of the metal hydroxide flame retardant. desirable.

Phosphorus-based flame retardants can exhibit flame retardant effects in both gas phase and condensed phase at the same time. By dehydration and carbonization by phosphoric acid generated by thermal decomposition, char is formed to prevent heat transfer to the inside by physical The flame retardant effect in the solid phase is superior to that in the gas phase. Specifically, the phosphorus-based flame retardant reacts with a combustible material during the combustion process to form a carbonized layer on the surface of the polymer, and the carbonized layer blocks oxygen required for combustion to exhibit a flame retardant effect. In particular, since the phosphorus-based flame retardant exhibits a flame retardant effect by reacting with the oxygen element in the polymer to dehydrate and carbonize, it effectively plays a flame retardant role in the polymer containing the oxygen element. Phosphorus-based flame retardants can use known phosphorus-based flame retardants, specifically, phosphoric acid ester (phosphate), phosphonate (phosphonate), phosphinate (phosphinate), phosphine oxide (phosphine oxide), phosphazene (phosphazene) etc. can be used.

The metal hydroxide flame retardant exhibits flame retardancy by the action of dehydration reaction occurring in the range of 200 ~ 300 ℃, cooling the solid phase, blocking combustible gas due to generation of water vapor and diluting fuel. It is possible to secure flame retardancy by forming a non-flammable glass layer (low melting glass) on the surface along with the release of water vapor during thermal decomposition. As the metal hydroxide flame retardant, known metal hydroxide flame retardants may be used, and specifically, Al(OH) 3 , Mg(OH) 2 , and the like may be used as inorganic-non-halogen flame retardants.

The flame retardant is preferably included in an amount of 30 to 85 parts by weight based on 100 parts by weight of the phenol resin. If the content of the flame retardant is less than 30 parts by weight, the flame retardant effect is insignificant because the char formation is not smooth, and if the content exceeds 85 parts by weight, the phenol resin This is because miscibility with the flame retardant is not uniformly distributed in the polymer composition and a problem of aggregation may occur.

The filler is added to improve the strength of the polymer layer, and may be included in 10 to 20 parts by weight based on 100 parts by weight of the phenol resin. This is because when it is included, there is a problem in that the mixing property with the phenol resin is lowered and the aggregation or separation of the filler occurs.

Granular inorganic materials may be used as the filler, and for example, talc, mica, quartz, wollastonite, calcium carbonate, lime, feldspar, and hollow glass balls may be used, but are not limited thereto.

The curing agent is a component added to promote curing of the phenol resin, and may be included in an amount of 3 to 8 parts by weight based on 100 parts by weight of the phenol resin. If it exceeds the part, since curing proceeds excessively quickly, cracks may occur during the curing process or bubbles or irregularities may be formed on the surface, it is preferably included within the above-described weight range.

As the curing agent, paraformaldehyde, hexamethylenetetramine (hexaamine), etc. may be used, but is not limited thereto.

The polymer composition may further include a flame retardant capsule that improves fire resistance performance by absorbing thermal energy in the event of a fire. The flame retardant capsule has a micro-sized core-shell capsule structure, a phase change material is used as a core material, and polyurea having excellent abrasion resistance and heat resistance may be used as a shell material.

As the phase change material, at least one of paraffinic hydrocarbons, dimethyl propanediol, and hydroxymethyl-methyl-propanediol may be used, which undergoes phase change during a fire and absorbs heat energy.

These flame retardant capsules may be used in an amount of 10 to 27 parts by weight based on 100 parts by weight of the phenolic resin. When used in an amount less than 10 parts by weight, the fire resistance performance improvement effect is insignificant in the event of a fire, and if it exceeds 27 parts by weight, the strength of the polymer layer is reduced. Since it may be lowered, it is preferable to be included within the above-described content range.

On the other hand, the polymer composition may further include a functional enhancer for preventing peeling or lifting that may occur at the interface between the organic-inorganic composite reinforcing material and the polymer layer by improving the adhesive strength between the organic-inorganic composite reinforcing material and the polymer layer. .

When the functional enhancer is included, not only the adhesive strength between the organic-inorganic composite reinforcing material and the polymer layer is improved, but also the adhesive strength to the target surface on which construction is performed in the construction stage can be improved.

A phosphoric acid-containing acrylic resin can be used as a function enhancer having such a function, and since the strength of the polymer layer can be further improved due to the inherent strength of the phosphoric acid-containing acrylic resin, when using a phosphoric acid-containing acrylic resin as a function enhancer It is possible to improve the workability and durability of the ECS composite panel.

The phosphoric acid-containing acrylic resin may include at least one selected from the group consisting of glycerol phosphate dimethacrylate, methacryloyloxydecyl phosphate, hydroxyethyl methacrylate phosphate, and hydroxyethyl acrylate phosphate.

When the functional enhancer is included, an initiator for accelerating curing of the functional enhancer may be included, and the type of initiator is not particularly limited.

The function enhancer may be included in 2 to 8 parts by weight based on 100 parts by weight of the phenol resin, and when included in less than 2 parts by weight, the above-described function enhancing effect is insignificant, and when it exceeds 8 parts by weight, the polymer layer is cured during the curing process. Cracks may be induced, fire resistance is deteriorated, and the bending strength of the polymer layer is deteriorated, so it is preferable to be included within the above-described weight range.

On the other hand, when the composite panel is attached to the concrete repair/reinforcement surface, after the first adhesive is applied to one surface of the composite panel, the surface to which the first adhesive is applied may be placed in contact with the concrete repair/reinforcement surface. there is. In this case, an epoxy adhesive may be used as the first adhesive, preferably a flame retardant epoxy adhesive, and a commonly used epoxy adhesive or a commercially available epoxy adhesive may also be used.

Subsequently, a step of fixing the composite panel to the concrete repair/reinforcement surface using an anchor is performed. In this step, drilling holes are formed on the composite panel and the concrete repair/reinforcement surface, and the composite panel can be fixed to the concrete repair/reinforcement surface by inserting and binding anchors into the drilling holes.

Next, a step of attaching the fire resistant panel on the composite panel using a second adhesive may be performed.

This step is a step of attaching the fire resistant panel to the composite panel by applying a second adhesive to one surface of the fire resistant panel and placing the second adhesive in contact with the composite panel. In this case, an epoxy adhesive may be used as the second adhesive, preferably a flame retardant epoxy adhesive, and a commonly used epoxy adhesive or a commercially available adhesive may also be used.

The fireproof panel is a fiber-reinforced cement panel or metal panel, has first class flame retardancy, that is, non-combustible performance, has high ductility and impact resistance, can be installed on curved surfaces, and is resistant to moisture and pests.

Preferably, the fireproof panel may be a fiber-reinforced cement panel, that is, a fiber-reinforced cement panel. Fiber-reinforced cement panels can be formed by curing a mortar composition comprising cement, cellulosic fibers, polymers and fillers.

The mortar composition forming the fiber-reinforced cement panel may include 15 to 38 parts by weight of cellulose fiber, 12 to 26 parts by weight of polymer, and 5 to 20 parts by weight of a filler, based on 100 parts by weight of cement. A fiber-reinforced cement panel can be formed by mixing, putting in a mold of a predetermined shape and hardening, and then removing the mold.

In this way, when manufacturing a fiber-reinforced cement panel, as a mortar composition whose main component is cement is used, the fiber-reinforced cement panel has first-class flame retardant properties and is lightweight due to the addition of cellulose fibers, polymers and fillers, making it a composite panel. It has the advantage of being able to reduce the load applied when attaching to the panel, having excellent durability due to its excellent strength and toughness, and being able to be firmly attached to the composite panel through the adhesive due to its increased compatibility with the adhesive.

The cement is a binder that forms the main framework of the fiber-reinforced cement panel and a non-combustible material that imparts incombustible performance. It is an inorganic mixture containing lime, alumina, silica, iron oxide, etc. It is a composition that expresses

The cement is selected from the group consisting of ordinary Portland cement, medium heat cement, early strong cement, sulfate-resistant cement, white cement, colloid cement, blast furnace cement, fly ash cement, silica cement, ultra-low heating cement, geothermal well cement and alumina cement. At least any one or more may be used, and preferably, at least one or more of ordinary Portland cement, silica cement, and alumina cement may be used.

The cellulose fiber is a component added to lighten the weight and strengthen the toughness of the fiber-reinforced cement panel, and may be included in an amount of 15 to 38 parts by weight based on 100 parts by weight of cement. And, if it is included in excess of 38 parts by weight, it causes a decrease in the hardness and strength of the fiber-reinforced cement panel, making it difficult to use it as a repair and support panel, so it is preferable to add it within the above-mentioned weight range.

As such cellulose fibers, nano-cellulose fibers surface-treated with epoxy silane may be used. The nano-cellulose fibers surface-treated with epoxy silane are uniformly dispersed in the mortar composition, strengthen the bonding strength of the organic-inorganic compound to strengthen the strength of the fiber-reinforced cement panel itself, and attach the fiber-reinforced cement panel to the composite panel. As the compatibility with the flame retardant epoxy adhesive used when the adhesive is used increases, the adhesive force between the fiber-reinforced cement panel and the composite panel using the adhesive can be strengthened.

The nano-cellulose fibers surface-treated with the epoxy silane are prepared by heating the cellulose dispersion to 60 to 120 ° C. and dropwise reacting the epoxy silane compound to prepare the nano-cellulose fibers surface-treated with the epoxy silane, then pulverizing them with a grinder and homogenizing under high pressure It can be prepared by nano-processing.

Epoxy silane compounds used at this time are 2-(3,4 epoxycyclohexyl)ethyl trimethoxysilane, 3-glycidoxypropylmethyl dimethoxysilane, 3-glycidoxypropyl trimethoxysilane, 3-glycidoxy It may be at least one selected from the group consisting of propylmethyl diethoxysilane and 3-glycidoxypropyl triethoxysilane.

As such, the surface-treated nanocellulose fibers with epoxy silane have effects such as increased binding force, increased dispersibility, and increased compatibility due to the epoxy silane compound used for surface treatment.

In addition, the grinder used for nanoization is a device in which two disks rotate in different directions with a fiber, which is a ground material, in between to grind the ground material, and the high-pressure homogenizer is ground into a thin tube having an angle of about 90 degrees. It is a device that converts pulverized materials into nanoparticles by mechanically colliding them by passing water through them.

In order to nanoize the cellulose fibers, the grinder or high-pressure homogenizer is not used alone, but the thickness and length of the nano-cellulose fibers surface-treated with epoxy silane have unique properties by performing the grinder treatment followed by the high-pressure homogenizer treatment, so that the fiber-reinforced It is possible to achieve both weight reduction and physical property enhancement of cement panels.

The polymer is added to uniformly bind each component included in the mortar composition and to improve performance such as pot life, workability, elasticity, fluidity, acid resistance, heat resistance and durability of the fiber-reinforced cement panel. The polymer may be included in an amount of 12 to 26 parts by weight based on 100 parts by weight of cement. If the polymer is included in the above weight range, it is difficult to obtain the above-mentioned effect, and if the polymer is included in the above weight range, it is difficult to obtain the fiber-reinforced cement. Since the function as a panel may be lost due to a decrease in hardness or strength of the panel, and it may be difficult to develop incombustible performance, it is preferably included within the above-described weight range.

As the polymer, a mixed composition including a phenol-modified rosin ester resin, an ethylene vinyl acetate resin, and a styrene butadiene resin may be used, and 20 to 40 parts by weight of ethylene vinyl acetate resin and styrene butadiene based on 100 parts by weight of the phenol-modified rosin ester resin 1 to 10 parts by weight of the resin may be included.

When each resin included in the mixed composition is included in the aforementioned weight range, physical properties such as adhesion, wetting with an adherend, heat resistance, cold resistance, strength, compatibility, and toughness may be improved.

The filler is a material added to improve the strength and increase the volume of the fiber-reinforced cement panel, and at least one selected from the group consisting of calcium carbonate, silica, kaolin, clay, alumina, magnesium hydroxide, and mica is used. can

The filler may be included in 5 to 20 parts by weight based on 100 parts by weight of cement, and when included within this weight range, sufficient strength and volume can be secured, and when the weight ratio is out of the above range, the fiber-reinforced cement panel itself Since problems such as separation of particulate matter, generation of cracks, and deterioration of physical properties such as toughness and strength may occur due to a decrease in adhesive strength, it is preferably included within the above-described weight range.

The mortar composition used to form the fiber-reinforced cement panel may further include additives. The additive may be a strength enhancer, and the strength enhancer used in the present invention may be polycrezulene. The additive is preferably included in an amount of 0.5 to 1.0 parts by weight based on 100 parts by weight of the mortar composition. If the content of the additive is less than the above range, the strength improvement effect of the fiber-reinforced cement panel by the addition of the additive is insignificant, and the above-mentioned range This is because when it is included in excess, the stability of the mortar composition becomes poor, resulting in poor physical properties of the fiber-reinforced cement panel.

Next, a second fixing step of firmly fixing the fireproof panel to the composite panel using anchors is performed. This step may be a step of forming a perforation hole penetrating a part of the composite panel while completely penetrating the fireproof panel, and fixing the fireproof panel to the composite panel by fixing an anchor to the perforation hole.

Finally, a finishing step of finishing the surface of the fireproof panel may be performed. The finishing treatment may be performed by attaching a finishing material panel to the surface of the fireproof panel or applying a finishing material paint, and the type of finishing material is not particularly limited.

Hereinafter, specific actions and effects of the present invention will be described through an embodiment of the present invention. However, this is presented as a preferred example of the present invention, and the scope of the present invention is not limited according to the examples.

[Production Example]

First, 1000 g of ordinary Portland cement, 240 g of cellulose fiber, 190 g of polymer, and 130 g of calcium carbonate filler are uniformly mixed to prepare a uniform powder mixture, and then 1000 g of water is mixed and stirred to prepare a mortar composition, which is poured into a mold After curing for 24 hours, the frame was removed to prepare a fiber-reinforced cement panel, which is a fireproof panel of Example 1.

When preparing the mortar composition, as the cellulose fibers, nano-cellulose fibers prepared by the following method and surface-treated with epoxy silane were used. First, a 40% aqueous solution of cellulose is heated to 85±5° C., and 3-glycidoxypropylmethyl dimethoxysilane is added dropwise thereto for 2 hours to prepare nanocellulose fibers surface-treated with epoxy silane, and the reaction product solution After pulverization with a grinder, high-pressure homogenization was performed to nano, and it was dried with hot air at 70 ± 5 ° C. for 24 hours to prepare nano-cellulose fibers surface-treated with epoxy silane.

As the polymer, a mixture composition in which 20 to 40 parts by weight of an ethylene vinyl acetate resin and 1 to 10 parts by weight of a styrene butadiene resin were mixed with respect to 100 parts by weight of a phenol-modified rosin ester resin was used.

[Experimental Example 1]

The fiber-reinforced cement panel of Example 1 prepared in Preparation Example was evaluated for incombustibility and gas hazard, and the results are shown in Table 1. Incombustibility tests were conducted in accordance with KS F ISO 1182, and gas hazards were conducted in accordance with each KS F 2271.

Test Items Criteria Test result Incombustibility test mass loss rate 30% or less 19% The difference between the maximum temperature and the final equilibrium temperature below 20℃ 0.7℃ Gas toxicity test Mean duration of cessation of behavior in test rats 9+ minutes 13 minutes 30 seconds

As a result of the experiment, it was confirmed that the fiber-reinforced cement panel according to an embodiment of the present invention has non-combustible characteristics because it satisfies the non-combustible material standard as a result of the non-combustibility test and the gas hazard test.

[Experimental Example 2]

A fiber-reinforced cement panel was manufactured using the same method as in Preparation Example, but a fiber-reinforced cement panel of Comparative Example 1 was prepared using general cellulose fibers without separate surface treatment with cellulose fibers used in the mortar composition, , A fiber-reinforced cement panel of Comparative Example 2 was prepared using nano-nano-cellulose fibers without separate surface treatment.

Subsequently, the compressive strength of the fiber-reinforced cement panels of Example 1 and Comparative Examples 1 and 2 was measured according to KS F 4042, and the results are shown in Table 2.

Example 1 Comparative Example 1 Comparative Example 2 Compressive strength (MPa) 13.1 9.5 9.8

Referring to the experimental results of Table 2, in the case of Example 1, it was found that the compressive strength was better than Comparative Example 1 or Comparative Example 2. This is considered to be the result of the increased miscibility and binding force in the mortar composition of the cellulose fibers due to the surface treatment of the cellulose fibers. Therefore, from the results of this experiment, it is preferable to use nanocellulose fibers surface-treated with epoxy silane, rather than general cellulose fibers or general nanocellulose fibers, as the fiber reinforcing agent of the mortar composition used in the manufacture of the fiber-reinforced cement panel of the present invention. I was able to confirm.

[Experimental Example 3]

A fiber-reinforced cement panel was manufactured using the same method as in the preparation example, but the fiber-reinforced cement panel was prepared by further including polycrezulene, a strength enhancer, as an additive to the mortar composition, and compression in accordance with KS F 4042 The strength was measured, and the length change rate due to absorption according to KS L 5114 was measured, and the results are shown in Table 3. In Table 3, the content of the strength enhancer was described as a weight ratio with respect to 100 parts by weight of cement.

Strength enhancer (weight ratio) Compressive strength (MPa) Length change rate (%) Example 1 - 13.1 0.21 Example 2 0.2 13.2 0.19 Example 3 0.5 15.0 0.18 Example 4 0.8 15.5 0.15 Example 5 1.0 15.3 0.17 Example 6 1.3 11.4 0.28

Referring to the experimental results of Table 3, it was confirmed that the compressive strength and length change rate were improved according to the addition of the strength enhancer. In particular, it was confirmed that these physical properties were significantly improved when the content of the strength enhancer was 0.05 parts by weight or more. However, when the content of the strength enhancer was excessive, as in Example 6, it was found that the strength and length change rate rapidly deteriorated. From the results, it was confirmed that a strength improver is further added to the mortar composition to improve the strength and ensure durability of the fiber-reinforced cement panel, but the content is preferably 0.5 to 1.0 parts by weight based on 100 parts by weight of cement.

The present invention is not limited to the specific embodiments and descriptions described above, and various modifications can be made by anyone skilled in the art without departing from the gist of the present invention claimed in the claims. and such modifications are within the protection scope of the present invention.

Claims (6)

A pretreatment step of flattening the surface of the concrete repair/reinforcement surface;
A composite panel attachment step of attaching a composite panel to a concrete repair/reinforcement surface using a first adhesive;
A first fixing step of fixing the composite panel to a concrete repair/reinforcement surface using an anchor;
A fire resistant panel attachment step of attaching a fire resistant panel on a composite panel using a second adhesive;
A second fixing step of fixing the fireproof panel to the composite panel using anchors; and
Including; a finishing step of finishing the surface of the fireproof panel,
The composite panel is an ECS (Evolutionary Curing System) composite material panel in which an organic-inorganic composite reinforcing member is located inside a fiber reinforced panel (FRP) sheet or a polymer layer,
The fireproof panel is a fiber-reinforced cement panel made of a mortar composition containing 15 to 38 parts by weight of cellulose fiber, 12 to 26 parts by weight of a polymer, and 5 to 20 parts by weight of a filler, based on 100 parts by weight of cement, and the mortar composition Silver, a non-combustible construction method using a fireproof panel, characterized in that it further comprises 0.5 to 1.0 parts by weight of polycrezulene based on 100 parts by weight of the mortar composition.
According to claim 1,
The polymer layer is formed by a polymer composition including a phenol resin, a flame retardant, a flame retardant capsule, a filler and a curing agent,
The organic-inorganic composite reinforcing material is a non-combustible construction method using a fireproof panel, characterized in that it comprises a thermosetting polymer, inorganic fibers, organic fibers and organic additives.
According to claim 1,
The fireproof panel is a non-combustible construction method using a fireproof panel, characterized in that the metal panel.
delete According to claim 1,
The cellulose fiber is a non-combustible construction method using a fireproof panel, characterized in that the surface-treated nano-cellulose fiber with epoxy silane.
delete