KR101983083B1 - Crack waterproofing method of concrete structure - Google Patents

Abstract

The present invention relates to a crack waterproofing method of a concrete structure, comprising: a first step of polishing a repair construction surface including a crack area (s) damaged on the concrete structure (c) and washing the crack area (s) with a high pressure; a second step of installing an L-shaped anchor member (110) in a shape connecting a horizontal member and a vertical member to a side wall of the repair construction surface which is polished and washed; and a third step of spreading a particle-type crack reinforcing material on the damaged crack area (s) from among the repair construction surface polished and washed, processing the surface, and forming a crack reinforcement layer (120). Thereby, the present invention is differs from a conventional, simple repair method by using a mortar composition and a waterproofing material for the repair surface with a deeply engraved crack area on the ferroconcrete structure, to perfectly make the structure waterproof through a multilayered structure, whose each part has a waterproof function, to improve the watertightness of each multilayered structure, and to strengthen a fastening structure for a crack in the waterproofed area.

Description

Crack waterproofing method of concrete structure

The present invention relates to a method for cracking and waterproofing a concrete structure, and more particularly, to a cracking and waterproofing method for a concrete structure, more specifically, a cracking area is deeply formed on a reinforced concrete structure, The present invention relates to a cracking and waterproofing method of a concrete structure for improving the watertightness of each multi-layered structure and enhancing the fastening structure for the cracked and waterproofed area, in addition to perfecting waterproofing through the multi-layered structure.

Generally, rainwater or groundwater penetrates into a building such as a roof or underground outer wall of a reinforced concrete structure or an underground parking lot slab, and a void crack occurs due to a change in the volume of the water due to a temperature change. Waterproofing is a very important factor in the concrete structure because the life of the civil engineering structure is lowered.

Particularly, in the related art, it is required to develop a technique for a case where water penetrates by a cavity when a crack is deep, such as a roof or an underground outer wall of a reinforced concrete structure and an upper slab of an underground parking lot.

Korean Utility Model Application No. 20-2005-0007952 " Stud-fixing sheet for concrete repair / enforcement "

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a waterproofing structure for waterproofing a reinforced concrete structure, And to improve the watertightness of each multi-layered structure, thereby strengthening the fastening structure for the cracked and watertight area, and to provide a crack-waterproofing method for a concrete structure.

In addition, the present invention is also applicable to a cracking and waterproofing method of a concrete structure in order to prevent cracks from occurring easily even for external force once constructed by unifying the fastening structures between the layers, .

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, a crack waterproofing method of a concrete structure according to an embodiment of the present invention includes: a first step of cleaning and repairing a repair surface including a damaged crack region s of a concrete structure c; A second step of installing an L-shaped anchor member (110) having a shape in which a horizontal member and a vertical member are connected to a side wall of the cleaned and repaired maintenance construction surface; And a third step of applying a microparticle type crack reinforcement material to the damaged crack area s of the cleaned and cleaned repair surface to form a crack reinforcing layer 120 by surface treatment; And a control unit.

After the third step, a fourth step of binding the mesh member 130 to the rim using a vertical member constituting the L-shaped anchor member 110 on the upper part of the crack-strengthening layer 120 filled in plain form; And further comprising:

The cracking and waterproofing method of a concrete structure according to an embodiment of the present invention is a method in which a cracked region is deeply formed on a reinforced concrete structure and a multi-layered structure having waterproofing function is removed from a simple repairing method using a conventional mortar composition and a waterproofing material, The watertightness of the respective multi-layered structures is improved and the fastening structure for the cracked and watertight areas can be strengthened.

In addition, the cracking and waterproofing method of a concrete structure according to another embodiment of the present invention is completely filled even in a place where many cracks are small due to a large number of bends, and the fastening structure between the layers is integrated, Thereby providing an effect of preventing cracks from occurring.

1 to 3 are views showing a crack waterproofing method of a concrete structure according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 to 3 are views showing a crack waterproofing method of a concrete structure according to an embodiment of the present invention. Referring to FIGS. 1 and 3, a repair surface including a damaged crack region s of a concrete structure c is cleaned and then subjected to high-pressure cleaning (FIG. 1B). The cleaned repair surface is horizontally Type anchor member 110 having a shape in which a member and a vertical member are connected to each other (FIG. 1C), and a fine particle type crack reinforcement material is applied to the damaged crack region s of the cleaned and repaired repair surface, (FIG. 1D).

Then, the mesh member 130 is bound to the rim (FIG. 2A) using a vertical member constituting the L-shaped anchor member 110, and the mesh member 130 is attached to the upper part of the horizontally filled crack- The mortar composition is applied to the lower portion of the vertical member of the L-shaped anchor member 110 to form a mortar layer 140 (FIG. 2B) Reinforced sheet layer 150 is formed so as to coincide with the upper surface of the reinforcing sheet 150 (Fig. 2C).

Thereafter, a primer layer 160 is formed by applying a primer composition on the strength-reinforcing sheet layer 150 (FIG. 3A), a paint is applied on the primer layer 160 to form a paint layer 170 3b, and the waterproof layer 180 is formed on the paint layer 170 to complete the cracking and waterproofing method for the concrete structure.

Each process will be described in more detail below.

In the course of repairing the repair surface including the damaged crack area s of the concrete structure c in FIG. 1B and cleaning the high pressure, the repair of the damaged concrete structure c formed with the crack area s as shown in FIG. It is preferable to form the side portion in a flat or curved shape in order to form the L-shaped anchor member 110 in Fig. 1C, for example, by grinding with a grinder or by breaking with a breaker to remove the deteriorated portion on the construction surface . In addition, it is preferable to carry out a process of removing a portion stained by dust, moss, laitance, peat peeling, whitening, yellowing remaining on the surface before and after polishing by using a high pressure scooper.

In the process of installing the L-shaped anchor member 110 in which the horizontal member and the vertical member are connected to the sidewall of the cleaned and repaired repair surface of FIG. 1C, the end of the screw- The anchor member 110 is preferably formed to have the same height at a predetermined interval and the end of the vertical member of the L-shaped anchor member 110 is formed at a position lower than the upper surface of the concrete structure c.

Here, the L-shaped anchor member 110 includes an axial portion of the damaged crack region s of the concrete structure c and a shaft portion of the crack reinforcement layer 120, the mesh member 130, the mortar layer 140, 150) is preferably made of a material having good fatigue strength, excellent rust resistance, low ductility, high tensile strength, high strength at a small cross section, and excellent resistance to stress corrosion.

In the course of forming the crack-strengthening layer 120 by applying the microparticle type crack reinforcement material to the damaged crack region s of the cleaned and repaired repair surface of FIG. 1d, the fine particle type crack reinforcement composition has an average particle diameter 34 to 45 parts by weight of a polyurethane prepolymer having an average particle size of 2 to 4 μm, 10 to 15 parts by weight of a diluent, 20 to 24 parts by weight of a filler having an average particle diameter of 2 to 4 μm, 100 parts by weight of a thickener 7 to 12 parts by weight of a plasticizer, 10 to 15 parts by weight of a plasticizer, 5 to 12 parts by weight of a latent curing agent, and 5 to 7 parts by weight of an admixture. Particulate cement can be used as fine particulate cement circulated in the market. When the particulate cement is larger than the desired particle size, the existing cement can be used by ball milling, jet milling, ultrasonic vibration mill or the like, and the polyurethane prepolymer can be used as fine particle cement A ball mill, a jet mill, or an ultrasonic vibration bill.

Wherein the polyurethane prepolymer is an anionic hydrophilic aqueous polyurethane dispersion and is a polymer polyol having a number average molecular weight of not less than 200 g / mol and not more than 4000 g / mol and an OH functionality of not less than 1.5 and not more than 6, diisocyanate, A polyether having a primary hydroxyl group at one end and a monomolecular diol, reacting the prepared prepolymer with a diol having a hydrophilic group, a diamine having a hydrophilic group, or a mixture thereof, after completely dissolving the prepared prepolymer in an organic solvent, A water dispersion is prepared by neutralizing with a neutralizing agent and adding water as a dispersion medium. A chain extension agent is added to the water dispersion to perform a chain extension reaction, and the organic solvent in the reaction solution is removed to prepare a resin.

On the other hand, in the present invention, a bifunctional glycol such as ethylene glycol or 1,4-butanediol is introduced as a chain extender to produce a polyurethane preform. Thereafter, as a further embodiment of the present invention, benzoyl corolide and a water absorbent, sodium amylosilicate as a reaction inhibitor, are added to the polyurethane prepolymer to stabilize the compound, and then toluene, ethyl acetate, methyl ethyl ketone And then mixed at 250 to 400 rpm for at least 2 hours to prepare a resin for a polyurethane adhesive.

On the other hand, the polyurethane prepolymer is characterized in that the polyol and the diisocyanate are reacted so that the equivalent ratio of NCO / OH is 2.6 to 2.7, thereby having a diisocyanate group having a valence of two or more at the end.

In another embodiment of the present invention, the diisocyanate is an important structural element of the particulate type crack reinforcement composition. Diisocyanates are compounds having the general structure O = C = N-X-N = C = O, where X is an aliphatic, cycloaliphatic or aromatic radical, preferably an aliphatic or cycloaliphatic radical containing 4 to 18 carbon atoms.

Examples of suitable isocyanates include 1,5-naphthylene diisocyanate, 4,4'-diphenylmethane diisocyanate (MDI), hydrogenated MDI (H12 MDI), xylylene diisocyanate (XDI), tetramethylxylylene Diisocyanate (TMXDI), 4,4'-diphenyldimethylmethane diisocyanate, di- and tetra-alkyldiphenylmethane diisocyanate, 4,4'-dibenzyldiisocyanate, 1,3-phenylene diisocyanate, 1 , 4-phenylene diisocyanate, isomer of tolylene diisocyanate (TDI), 1-methyl-2,4-diisocyanatocyclohexane, 1,6-diisocyanato-2,2,4-trimethylhexane , 1, 5-trimethylcyclohexane (IPDI), chlorine and bromine (1, 2, 3-diisocyanato-2, 4, 4-trimethylhexane, 1-isocyanatomethyl- Diisocyanate, phosphorus-containing diisocyanate, 4,4'-diisocyanatophenylperfluoroethane, tetra Diisocyanate, hexane-1, 6-diisocyanate (HDI), dicyclohexylmethane diisocyanate, cyclohexane-1, 4-diisocyanate, ethylene Diisocyanate, phthalic acid-bis-isocyanatoethyl ester and also 1-chloromethylphenyl-2,4-diisocyanate, 1-bromomethylphenyl-2,6-diisocyanate, Diisocyanates containing reactive halogen atoms, such as 4,4'-diphenyl diisocyanate.

The sulfur-containing polyisocyanate is obtained, for example, by reaction of 2 moles of hexamethylene diisocyanate with 1 mole of thiodiglycol or dihydroxydihydrosulfide. Other important diisocyanates are trimethylhexamethylene diisocyanate, 1,4-diisocyanatobutane, 1,12-diisocyanatododecane and dimeric fatty acid diisocyanates. Particularly suitable diisocyanates are tetramethylene, hexamethylene, undecane, dodecamethylene, 2,2,4-trimethylhexane, 1,3-cyclohexane, 1,4-cyclohexane, Tetramethyl xylene, isophorone, 4,4-dicyclohexyl methane and lysine ester diisocyanate. Tetramethylxylene diisocyanate (m-TMXDI, manufactured by Cyanamid) is most particularly preferred.

The molar ratio of diol to diisocyanate should be close to 1: 1 to obtain high molecular weight. The molar ratio is generally in the range of 1: 0.95 to 1: 1.25, preferably in the range of 1: 0.95 to 1: 1.12, and more preferably in the range of 1: 0.98 to 1: 1.1.

If the midpoint is particularly high molecular weight, the chain extension should be carried out in a known manner by initially preparing a prepolymer having an excess of diisocyanate, followed by extension of the formed prepolymer with a short chain diol or diamine or with water.

Specific examples of the chain-softening agent include ethylene glycol or ethylene glycol condensate, butane-1,3-diol, butane-1,4-diol, butene diol, propane- Di-2-hydroxyethyl amide, succinic acid di-N-methyl- (2 (meth) acrylate, 2-ethylhexyl acrylate, 2-ethylhexyl acrylate, -Hydroxyethyl) -amide, 1,4-di- (2-hydroxymethylmercapto) -2,3,5,6-tetrachlorobenzene, 2-methylenepropane- Propane-1, 3-diol, and the like; Examples of the diamine compound include ethylenediamine, hexamethylenediamine, 1,4-cyclohexylenediamine, piperazine, N-methylpropylenediamine, diaminodiphenylsulfone, diaminodiphenylether, diaminodiphenyldimethylmethane, 2,4- Aliphatic, alicyclic and aromatic diamines such as isophoronediamine, dimer fatty acid diamine, diaminodiphenylmethane, or isomers of phenylenediamine; Hydrazides of carbhydrazides or dicarboxylic acids; Amino alcohols such as ethanolamine, propanolamine, butanoamine, N-methylethanolamine and N-methylisopropanolamine; Diethanolamine, triethanolamine and di- or tri- (alkanolamine); Aliphatic, alicyclic, aromatic and heterocyclic mono, such as glycine, 1- and 2-alanine, 6-aminocaproic acid, 4-aminobutyric acid, isomerized mono- and diaminobenzoic acid, isomerized mono- and diaminonaphthoic acids - < / RTI > diaminocarboxylic acid. ≪ RTI ID = 0.0 &

The particulate type crack reinforcement composition according to the present invention can be produced by both a single-step process and a dual-step process. In a two-step process, the prepolymer is initially prepared by partially pre-reacting a polyol such as, for example, a hydrophilic polyol with a diisocyanate.

The diluent may function as a polymer reactive diluent useful for structural adhesives, typically to use styrene to reduce the viscosity of the resin to the particulate type crack stiffener composition, or to extend the duration of action of the structural adhesive without adversely affecting the creep , A low molecular weight, polymer water reactive composition can be utilized.

That is, the ratio of the weight average molecular weight of one or more polymers, the polyfunctional polyol, the isocyanate group to the hydroxyl group (NCO / OH) is from 2.0 to 4.5 and the amount of the free isocyanate group is from 6 to 20, By utilizing a polymer reactive diluent containing at least 7% by weight of at least one polyisocyanate, it is possible to provide the effect of prolonging the action time of the structural adhesive.

The polymer is present in an amount of from 90 to 95% by weight based on the total weight of the diluent, the polyfunctional polyol component is present in an amount of from 4 to 8% by weight based on the total weight of the diluent, and wherein the polyisocyanate has a total weight of the diluent It is preferably present in an amount of 6 to 16% by weight as a basis.

On the other hand, the polyfunctional polyols include, but are not limited to, diols, triols, tetraols, pentaols, hexaols, polyester polyols, polyether polyols, polyetheramine polyol polymer blends thereof, .

The filler is characterized in that it is at least one selected from the group consisting of calcium carbonate, talc, clay, silica and acidic clay. In one embodiment of the present invention, the talc is added to the polyurethane prepolymer in order to improve the moldability and moisture resistance of the polyurethane prepolymer. When 100 parts by weight of the fine particle cement, which is the raw material of the two- 20 to 24 parts by weight of a filler may be used.

That is, when the amount of the filler is less than 20 parts by weight, the polyurethane prepolymer dissolves and the effect of improving the dimensional stability upon fusion with the fine particle cement deteriorates. When the amount exceeds 24 parts by weight, there is a fear that the durability and heat resistance Lt; / RTI >

The thickening agent is selected from the group consisting of silica, fumed silica, bentonite, clay, amide and cellulose, or a mixture of two or more thereof.

As the plasticizer, one selected from the group consisting of diisodecyl phthalate diisononyl phthalate, dioctyl phthalate, dibutyl phthalate and dioctyl adipate, or a mixture of two or more thereof is used.

The latent curing agent may be any one or a mixture of two or more substances selected from the group consisting of oxazolidine, ketazine, aldimine, ketimine, aldimine-ketimine, .

The admixture is provided to strengthen the cracking strengthening layer 120 by penetrating the concrete structure c and the mesh member 130 to be described later, and is composed of a fluidizing agent, an expanding agent and an adhesive agent. Or may be used by adjusting the composition ratio of the components. The fluidizing agent is used in an amount of 1 to 2 parts by weight based on the total weight of the particulate cement and has an average particle diameter of 2 to 4 탆, and it is preferable to use a naphthalene sulfonate surfactant as a main component. The swelling agent is preferably used in an amount of 0.5 to 1 part by weight based on the total weight of the particulate cement and has an average particle size of 1 to 2 占 퐉. Preferably, aluminum is used as the main component. The adhesive is 2 to 4 parts by weight based on the total weight of the particulate cement, Is 0.5 to 1 占 퐉, and it is preferable to use ethylene vinyl acetate as a main component.

The microparticle type crack reinforcement made of such a composition is made into a urethane synthetic type and is made into an environmentally friendly type as well as being made into an environmentally friendly type and has an excellent adhesive strength and is completely filled with fine cracks. It is possible to provide an easily adjustable effect.

In the process of binding the mesh member 130 to the rim using the vertical member constituting the L-shaped anchor member 110 on the horizontally filled crack-strengthening layer 120 of FIG. 2A, the mesh member 130 is warped The anchoring member 110 can be fastened through the vertical member of the L-shaped anchor member 110 and can be attached before the crack-strengthening layer 120 is fully cured so as to be effectively applied not only to the planar structure but also to the circular structure or the curved structure. have.

Here, the mesh member 130 may be a polyurethane-based material, and may be a resin composition composed of 10 to 20 parts by weight of ethylene vinyl acetate copolymer (EVA) and 5 to 10 parts by weight of polyethylene with respect to 100 parts by weight of polyurethane. The synthetic resin material produced by the same resin composition exhibits improved performance in terms of tensile strength, flexural strength, strain deformation temperature and Izod impact strength due to the resin using only polyethylene, have.

That is, after the polyurethane-based material composition is formed into a sheet shape, the polypropylene sheet passes through the upward direction of the needle split roller formed along the outer peripheral surface of the needle of the grid type, And a sheet having a diamond lattice structure is twisted by a winding device so as to have a number of turns of 30 or more per 1 m.

This structure maximizes the fastening force between the crack-strengthening layer 120 and the mortar layer 140, which will be described later, as well as the fixing structure between the particles in the mesh member 130 It is possible to provide the function of allowing the mortar layer 140 to be excellent in durability and durability.

In the process of forming the mortar layer 140 by applying the mortar composition to the upper portion of the grid-like mesh member 130 of FIG. 2B to a position lower than the uppermost end of the vertical member of the L-shaped anchor member 110, Based on 100 parts by weight of cement, 25 to 35 parts by weight of recycled polypropylene, 12 to 16 parts by weight of PCM capsule powder, 17 to 21 parts by weight of gypsum, and 2 to 3 parts by weight of alkali activator, 2 to 3 parts by weight of a glass fiber reinforced resin, 5 to 8 parts by weight of a flame retardant, and 15 to 25 parts by weight of silica sand, based on 100 parts by weight of the total thermal dispersion type binder, and then applied to the crack-strengthening layer 120 and cured The mortar layer 140 is formed.

Portland cement is usually divided into portland cement, moderate heat Portland cement, crude steel Portland cement, low heat Portland cement, and sulfate sulfate Portland cement. In the present invention, ordinary Portland cement is usually used. Portland cement is widely used as a construction cement. The major components are C ₃ S 51%, C ₂ S 25%, C ₃ A 9%, C ₄ AF 9% CaSO _{4 is about} 4%, and the specific surface area is about 3,300 cm ² / g.

The regenerated polypropylene is obtained by mixing carbon fiber with recycled polypropylene which is a waste synthetic resin to obtain a polypropylene resin which is a carbon fiber reinforced plastic (CFRP). The carbon fiber-reinforced polypropylene resin is stronger than iron, It has the advantage of being lightweight and not rusting and excellent in workability.

More specifically, a carbon fiber having excellent fracture strength is added to a polypropylene having excellent tensile strength by mixing and mixing 22 to 35 parts by weight of carbon fibers in a ratio of 65 to 78 parts by weight of recycled polypropylene, It is equipped with polypropylene which is a flammable material and flame retardant is added by a flame retardant to be described later to provide flame retardancy to fire that may occur in the construction process. Thus, the function as a mortar is regenerated by using polypropylene resin. Functionality can be demonstrated.

If the content of the recycled polypropylene is less than 25 parts by weight, the compressive strength is lowered. If the recycled polypropylene content is more than 35 parts by weight, the compressive strength and workability are deteriorated.

The nano-type PCM capsules powder phase transition material, which is a nano-type PCM capsule powder, is added as a nano-type PCM capsule powder powder. It is a material that repeatedly changes in solid, molten, thermal energy absorption, liquid, condensation, . It is preferable to use PCM-16 for the PCM used in the nano-type PCM capsule powder.

Meanwhile, the nano-type PCM capsule powder of the present invention has characteristics of a phase change material, size 7/1000000 mm (7 nm), ion repellency, anion resin, convection, excellent thermal diffusivity / The latent heat from the opposite side of the applied surface is thermally diffused and heat transferred by the nano-type PCM capsule powder to effectively dissipate the heat transfer to the outer wall wall of the concrete structure, which has been repaired and reinforced through thermal diffusion and heat transfer throughout the mortar layer have.

In the present invention, when the content of the nano-type PCM capsule powder is less than 12 parts by weight, the heat dispersion efficiency is lowered. If the content is more than 16 parts by weight, the compression strength of the mortar layer is decreased.

The gypsum is involved in initial strength and fluidity, and one or a mixture of two or more selected from the group consisting of phosphoric anhydride gypsum and hydrofluoric anhydrite gypsum can be used.

If the content of gypsum in the mortar layer 140 is less than 17 parts by weight, the initial strength is lowered. If the amount of gypsum exceeds 21 parts by weight, the fluidity is lowered.

The alkali activating agent may be one or two or more selected from the group consisting of alkali metal hydroxides, chlorides, sulfur oxides and carbonates, preferably sodium carbonate and sodium hydrogencarbonate. Is most advantageous in terms of strength development.

If the content of the alkali activating agent in the mortar layer 140 is less than 2 parts by weight or exceeds 3 parts by weight, the strength of the thermal dispersion type binder powder may be lowered.

The specific surface area of the thermal dispersion type binder thus produced contributes to the activity of the recycled polypropylene and nano-type PCM capsule powder, and the specific surface area of the thermal dispersion type binder is preferably 5,000 to 6,500 cm ² / g.

When the specific surface area of the thermal dispersion type binder is less than 5,000 cm ² / g, the activity of the recycled polypropylene and the nano-type PCM capsule powder is relatively low, so that the adhesion strength, compressive strength and heat dispersion efficiency can be lowered and 6,500 cm ² / g , The activity of the recycled polypropylene and the nano-type PCM capsule powder is high, but the workability in the repair and reinforcement work can be remarkably reduced.

The mortar composition may include 7 to 10 parts by weight of a glass fiber reinforced resin, 4 to 7 parts by weight of a flame retardant and 15 to 25 parts by weight of silica based on 100 parts by weight of the thermal dispersion type binder prepared as described above.

Containing the thermal dispersion type binder prepared in the preparation of the mortar composition, unlike the mortar composition based on the conventional portland cement, the heat transfer from the predetermined heat accumulation and heat generating function to the inside maintenance-reinforced section is minimized to ensure stable durability And has excellent properties in workability at a cross section having an irregular shape through securing initial fluidity.

Here, the glass fiber reinforced resin is formed to include glass fiber, polypropylene resin, and impact modifier. The glass fiber has an aspect ratio (delta) of 50 to 60 and the impact modifier is silicone core- (meth) acrylate shell impact A reinforcing agent and a polyolefin-based impact modifier grafted with an ethylenic unsaturated acid monomer. When the content is less than 7 parts by weight, the flexural strength and tensile strength are lowered. When the content is more than 10 parts by weight, workability is poor and work is difficult There is an uneconomical problem because it is an expensive material.

Here, the glass fiber contains 10 to 20 parts by weight per 100 parts by weight of the polypropylene resin, so that stiffness and flowability and a beautiful appearance can be secured within the above range.

For example, the impact modifier may be formed of a foamed polyethylene composition in an amount of 1 to 5 parts by weight based on 100 parts by weight of the polypropylene resin, thereby improving the tensile strength, tensile strength and rupture strength of the thermally- have.

As the flame retardant, antimony molybdate, aluminum hydroxide, molybdenum oxide, magnesium hydroxide or a mixture of two or more of them is used. Particularly, aluminum hydroxide (Al (OH) ₃ ) is heat-applied to an impact modifier formed as a foam type, and when the temperature exceeds 450 ° C., micropores are changed into a large number of active alumina and adsorption performance is obtained. Therefore, dioxin, It absorbs harmful substances such as gas (HCl), endothermic reaction during thermal decomposition, and has a cooling effect. It is nonflammable and has excellent water resistance and acid resistance. In addition, the flame retardant effect can be expected to be improved by using the above flame retardants in combination.

On the other hand, if the content of the flame retardant is less than 4 parts by weight, the flexural strength and the tensile strength are lowered. If the content is more than 7 parts by weight, workability is deteriorated and the work is difficult.

Silica sand can be mixed with those having an average particle diameter of 5 to 15 mm and those having an average particle diameter of 1 to 2 mm. The content ratio of those having an average particle diameter of 5 to 15 mm and those having an average particle diameter of 1 to 2 mm is in the range of 2 to 3 to 3 to 4 . When the average particle diameter and the content of the hornblende powders are within the above range, the flowability and compactness of the mortar composition for reinforcing the section of the concrete structure can be improved.

In the process of forming the strength reinforcing sheet layer 150 so as to coincide with the upper surface of the concrete structure c on the upper portion of the mortar layer 140 of FIG. 2C, the strength reinforcing sheet layer 150 having the adhesive layer formed on one side thereof And may be formed by depositing on the hardened mortar layer 140 so as to be matched with the height of the upper surface of the concrete structure (c).

More specifically, when the mortar composition is applied, the mortar composition must be cured so that the mortar composition can be cured. The curing time is preferably between 12 hours and 24 hours. When the mortar layer 140 is cured and solidified, the adhesive layer is formed on one side of the strength-reinforcing sheet layer 150 to be integrated with the mortar layer 140 and then adhered to the surface of the mortar layer 140 . In this embodiment, a thin film urethane film is used as the mortar layer 140, but it is not limited thereto. The thin film urethane film is preferably formed to have a lattice structure according to a mesh process by a needle split method.

For this purpose, a thin film urea film is prepared by mixing a slip agent and talc with a thermoplastic polyurethane (TPU) as a raw material, and a thermoplastic polyurethane (TPU) as a raw material is a urethane (- NHCOO-), which is excellent in mechanical strength and abrasion resistance, and has excellent properties in terms of insulating property, bending resistance, coloring property and texture. In addition, thermoplastic polyurethane (TPU) is a non-PVC thermoplastic resin that is environmentally friendly because it is harmless to the human body because there is no risk of generation of harmful compounds and does not emit air or soil pollutants during incineration.

Talc is added in order to improve the stretchability (moldability) of the thin film urethane film for producing the thin film urethane film and the moisture resistance performance, and is 3 to 5 parts by weight per 100 parts by weight of the total weight of the thermoplastic polyurethane (TPU) When the amount is less than 3 parts by weight, the effect of improving the dimensional stability of the thin film urethane film composition during melting and stretching is poor. When the amount is more than 5 parts by weight, the mechanical strength and abrasion resistance of the film may deteriorate remarkably.

The slip agent can prevent the thin film urethane film from sticking to each other when the thin film urethane film is wound by the winding device for the finished thin film urethane film. The slip agent used in the present invention is preferably an amide slip agent in an amount of 0.2 to 0.3 parts by weight based on 100 parts by weight of the total weight of the thermoplastic polyurethane (TPU). If the slip agent is used in an amount of less than 0.2 parts by weight, the coefficient of friction is not sufficiently lowered. If the slip agent is used in an amount exceeding 0.3 parts by weight, the winding rate may be lowered. Examples of the amide-based slip agent include unsaturated 13-cis-docosenamide (erucamide), 9-cis-octadecenamide (hereinafter referred to as oleamide) Octadecanamide (stearamide), and docosanamide (hereinafter referred to as behenamide) may be used, but it is more preferable to use an unsaturated system.

The thin film urea film thus produced as the strength reinforcing film can be formed on the outer surface of the mortar layer 140 to form the reinforcing layer 6 which improves the mechanical strength, the abrasion resistance and the bending resistance.

In the process of forming the primer layer 160 by applying the primer composition on the upper part of the strength-reinforcing sheet layer 150 of FIG. 3A, the primer forming the primer layer 160 on the upper layer 150 may include a paint A coating film is formed as a paint which is coated with a certain thickness so as to increase the corrosion resistance and adhesion when applied and flatten the top surface to improve the bonding strength with the strength reinforcing sheet layer 150 and to form a coating film, And a prepolymer having a hydrophobic functional group. The prepolymer having a hydrophilic functional group has an affinity with water, and the prepolymer having a hydrophobic functional group has affinity with an oil component.

More specifically, the prepolymer comprises 35 to 55% by weight of a prepolymer having a hydrophilic functional group, 30 to 40% by weight of a prepolymer having a hydrophobic functional group, and 5 to 35% by weight of an additive. The additive may be water.

In the process of forming the paint layer 170 by applying paint on the primer layer 160 of FIG. 3B and the process of forming the waterproof layer 180 on the paint layer 170 of FIG. 3C, The waterproof layer 180 is formed by applying a water repellent agent to the upper portion of the paint layer 170 to form the lower primer layer 160, In addition to the waterproof function of the sheet layer 150, the mortar layer 140, the mesh member 130 and the crack-strengthening layer 120 itself, it is possible to provide a waterproof function for the paint layer 170 corresponding to an additional shell.

Here, the waterproofing agent applied on the paint layer 160 may be a siliceous coating film waterproofing agent. The siliceous coating film waterproofing agent is a two-component siliceous coating film waterproofing agent composed of a powder type inorganic powder and an emulsion type liquid resin mixed with inorganic powder and liquid resin at a weight ratio of 14: 10. When applied to the primer layer, The siliceous coating film waterproof layer, that is, the first and second waterproofing coating layers can be formed.

The inorganic powder may include silicates, hybrid fiber reinforcements, fluidizers, cement, biotite powder. The inorganic powder according to one embodiment of the present invention comprises 3 to 4 parts by weight of silicate, 0.4 to 0.6 parts by weight of hybrid fiber reinforcement, 1 to 2 parts by weight of fluidizing agent, 20 to 27 parts by weight of cement and 40 to 65 parts by weight of gherkin powder .

The inorganic powder is used for improving the physical properties of the coating film by the curing reaction of the acrylic emulsion as well as hydration reaction of the cement after the waterproof layer is cured and the silane compound penetrates into the capillary of the waterproof layer through the pores of the thin film urea film to improve the water tightness It is used.

The silicate can be used as sodium silicate or potassium silicate, and one or both of them can be used in combination. The penetration performance of the silicate can be most effectively exhibited within 0.4 to 0.6 part by weight of the silicate.

The hybrid fiber reinforcement improves the tensile strength of the siliceous waterproof layer and improves the resistance to cracking. The hybrid fiber reinforcement enhances the bonding strength between the acrylic emulsion and the inorganic filler to improve the toughness of the siliceous waterproof layer and prevent cracking when forming the siliceous waterproof layer. Therefore, the siliceous waterproof layer can exhibit waterproof performance despite the voids of the thin film urethane film. Here, the hybrid fiber reinforcement may be formed by mixing two or more of polyethylene, polypropylene, and poly nylon.

The fluidizing agent maintains the self-leveling property of the mixed silicate-based coating film waterproofing agent. For example, the fluidizing agent may be composed of a nonionic surfactant. When the content of the fluidizing agent is less than 1 part by weight, it is difficult for the siliceous waterproof layer to maintain self-leveling. If the amount of the fluidizing agent is more than 2 parts by weight, the drying and curing of the siliceous waterproof layer may be delayed and adversely affect the physical properties of the waterproof layer.

Cement acts as an inorganic binder in siliceous coating film waterproofing agents. When the content of the cement is less than 20 parts by weight, the physical properties of the waterproof layer may be deteriorated due to a decrease in the strength of the siliceous waterproof layer and a weakening of the bonding strength with an inorganic filler (for example, hornblende powder). If the content of the cement exceeds 27 parts by weight, the strength of the siliceous waterproof layer increases but drying shrinkage cracks may occur due to heat of hydration of the cement, so that the durability of the siliceous waterproof layer may be lowered.

On the other hand, in the present invention, the liquid resin includes an acrylic ester emulsion, a silane compound, water, an antifoaming agent and a thickener. For example, the liquid resin may include 40 to 50 parts by weight of water, 1 to 2 parts by weight of a defoaming agent, 0.5 to 0.7 parts by weight of a thickener, and 20 to 30 parts by weight of a silane compound, based on 92 to 98 parts by weight of the entire acrylic emulsion .

Acrylic emulsions provide permeability, watertightness and adhesion to siliceous coatings. When the content of the acrylic emulsion is less than 92 parts by weight, the content of the liquid resin relative to the inorganic powder is too low, the firmness of the coating film waterproofing agent is lowered, the adhesion is weakened and the waterproofing performance is deteriorated. The viscosity of the coated waterproofing agent drops and the inorganic powder precipitates, making it difficult to form a homogeneous coating film. The physical properties of the coating film such as homogeneity, adhesion, durability and abrasion resistance of the coating film may be deteriorated.

On the other hand, water provides viscosity to the siliceous coating film waterproofing agent. When the content of water is less than 40 parts by weight, the viscosity of the mixed silicate-based coating film waterproofing agent is too high to lower the coating workability. If the water content exceeds 50 parts by weight, the water and cement ratio of the mixed coating waterproofing agent increases, The physical properties may be deteriorated.

When the content of the silane compound is less than 20% by weight, the penetration amount of the silane is insufficient to deteriorate the physical properties of the siliceous coating film waterproofing agent. When the content of the silane compound exceeds 30 parts by weight, .

As described above, preferred embodiments of the present invention have been disclosed in the present specification and drawings, and although specific terms have been used, they have been used only in a general sense to easily describe the technical contents of the present invention and to facilitate understanding of the invention , And are not intended to limit the scope of the present invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

110: L-shaped anchor member
120: Crack strengthening layer
130:
140: Mortar layer
150: Strength-strengthening sheet layer
160: primer layer
170: paint layer
180: Waterproof layer

Claims (2)

A first step of crushing the side of the repair surface including the damaged crack region (s) of the concrete structure (c) in the form of a flat surface or a curved surface, followed by high pressure cleaning;
A second step of installing an L-shaped anchor member (110) having a shape in which a horizontal member and a vertical member are connected to a side wall of the cleaned and repaired maintenance construction surface;
34 to 45 parts by weight of a polyurethane prepolymer having an average particle size of 2 to 4 μm with respect to 100 parts by weight of fine particle cement having an average particle diameter of 5 to 10 μm, 20 to 24 parts by weight of a filler having an average particle diameter of 2 to 4 μm, 7 to 12 parts by weight of a thickener, 10 to 15 parts by weight of a plasticizer, 5 to 12 parts by weight of a latent curing agent and 5 to 7 parts by weight of an admixture, A third step of forming a crack-strengthening layer 120 by applying a microparticle type crack reinforcing material formed by the above-mentioned method;
A fourth step of binding the mesh member 130 to the rim using a vertical member constituting the L-shaped anchor member 110, before the horizontally filled crack-strengthening layer 120 is fully cured, ;
A fifth step of forming the mortar layer 140 by applying the mortar composition to an upper portion of the grid-like mesh member 130 to a position lower than the uppermost end of the vertical member of the L-shaped anchor member 110;
A sixth step of forming a strength reinforcing sheet layer 150 so as to coincide with the upper surface of the concrete structure (c) above the mortar layer 140;
A seventh step of forming a primer layer 160 by applying a primer composition on the strength reinforcing sheet layer 150;
An eighth step of forming a paint layer (170) by applying paint on the primer layer (160); And
And a ninth step of forming a waterproof layer (180) on the paint layer (170)
In the fourth step, the mesh member 130,
Based material composition comprising a resin composition comprising 10 to 20 parts by weight of an ethylene vinyl acetate copolymer (EVA) and 5 to 10 parts by weight of polyethylene with respect to 100 parts by weight of a polyurethane,
A diamond grating structure is created by drag-type punching of a grid-like needle by rotation of the needle split roller in a state in which a polypropylene sheet passes upward of a needle split roller formed along the outer circumferential surface of a grid-
A structure in which a sheet having a diamond lattice structure is twisted by a winding device so as to have a number of turns of 30 or more per 1 m, a lattice is formed over a plurality of layers on a vertical plane,
In the fifth step,
The mortar composition comprises 25 to 35 parts by weight of recycled polypropylene, 12 to 16 parts by weight of a nano-type PCM capsule powder (nano type phase change material capsules powder), 17 to 21 parts by weight of gypsum and an alkali activator 2 to 3 parts by weight of a thermally decomposable binder and 2 to 3 parts by weight of a glass fiber reinforced resin based on 100 parts by weight of the thermal dispersion type binder (specific surface area of 5,000 to 6,500 cm2 / g) 8 to 8 parts by weight of silica and 15 to 25 parts by weight of silica to form a mortar layer 140 by applying it to the crack-strengthening layer 120 and curing the mixture.
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