KR101446663B1 - The concrete surface reinforcement and protect from burning construetion methodthereof - Google Patents

Abstract

The present invention relates to a fine crack repairing agent composition of a concrete structure which is characterized by containing 40 wt% of a concrete powder and 60 wt% of a surface reinforcing agent, wherein the concrete powder contains 40 wt% of a mixture mixing 25 kg of Portland cement, 25 kg of alumina cement, 5 kg of sodium carbonate, 3 kg of alunite, and 5 kg of a silicic acid-based compound, and 60 wt% of silica, and the surface reinforcing agent contains 70 kg of silane, 80 kg of an acrylic resin, 5 kg of an emulsifier, and 1 kg of a dispersing agent, and to a method for construction method of the same.

Description

Technical Field [0001] The present invention relates to a micro crack repairing composition for a concrete structure,

TECHNICAL FIELD The present invention relates to a microcrack repairing composition for a concrete structure made of a concrete powder and a surface strengthening agent, which is used for repairing microcracks or network cracks in a concrete structure, and a method of constructing the same.

Generally, a repair method that removes defects on the surface of cement concrete pavement, concrete structures, soundproof walls, and walls is used to remove defects or prevent defective parts from being subjected to direct vehicle load by forming a separate overlay layer , And a method of inhibiting breakage of the defective portion. In this repair method, the method of suppressing the breakage progress of the defective portion is considered to be an economical method that can be usefully applied when the degree of breakage is relatively small. In other words, it is recognized that damage or defects appearing on the surface are recognized, but if there is no further progression to such damage, the method is applied to judge that the effect on the running ability of the vehicle running on the pavement side is small.

However, in Korea, there is an example of application of sealer for surface reinforcement of cement concrete pavement. KS F 4930: 2002 "Concrete Surface Shaping Liquid Absorbing Agent" refers to a Korean industrial standard established by the Agency for Technology and Standards of the Ministry of Commerce, Industry and Energy, Means a material used for the purpose of preventing permeation of water, chloride ions and the like from the outside to prevent corrosion, erosion of the concrete surface and corrosion of the reinforcing steel by coating the surface layer for protection and impregnating the surface layer .

In the case of the US, which is a road-developed country, it has been found that regulations for concrete seals are being enacted in New York State, Ohio State, Illinois State, and Utah State. These sealers are materials used to prevent penetration of water and chlorides as concrete surface to prevent corrosion of reinforcing bars in concrete and to prevent deterioration of concrete. These regulations are mostly used to protect the concrete tops of exposed bridges And is intended to be used for the purpose of inhibiting the penetration of water and chloride and allowing the transfer of water vapor.

The sealer penetrates the concrete surface to fill voids and microcracks, and is intended to prevent the breakage of concrete by suppressing penetration of moisture and salinity. Depending on the material, a film is formed on the surface to promote such action. In addition to this protection and waterproofing action, the sealer material also acts to strengthen the surface when it has curing properties to ensure rigidity. As mentioned above, the surface protection property and the surface hardening property should be distinguished from each other and sometimes it should be distinguished according to the purpose. As in the present review, it is necessary to comprehensively consider such characteristics in the application of the sealing method for protecting the surface and strengthening the weak surface. However, in the case of an over-hardened sealer, the surface of the concrete may be brittle, which may cause brittle fracture to an excessive impact load on the vehicle. This brittleness is also known to be caused by external ultraviolet rays. As an example of the damage caused by this phenomenon, it can be said that the brittleness has been experienced through the early destruction of the thin layer overlay material on the past cement concrete pavement surface.

In recent years, one of the important characteristics that seals should be secured is ensuring ventilation. The role of this ventilation, which mineral seals offer as a relative advantage for the organic system, is to prevent the concentration of air containing moisture in the lower part of the protective or reinforcing layer applied on the surface, Thereby suppressing the generation of the virus. Damage due to these causes has been experienced through damage of the waterproof layer of the pavement pavement.

Thus, there are generally the following factors that determine the characteristics of the sealer in documents related to the sealer.

Water penetration, Water penetration, Penetration Depth, Ultraviolet Resistance, Reactivity of Concrete Materials, Service Life, Chloride and Water Absorption, Crack Bridging, Deicer Scaling Resistance,

The concrete surface should be dry and free of other foreign matter such as dust, oil, wax, curing agent, whiteness, retardation, coating, Therefore, prior to the installation of the sealer, proper repair of the vulnerable area or tear part should be preceded.

At least 5 days of air drying should be done after the curing period of the concrete, and at least 5 days of air drying after the grouting should be over. The sealer can not be installed when air drying is not complete.

In the case of precast concrete for accelerated curing, sealing shall be carried out after 5 days of filling and curing if the required curing is secured for 28 days after the required curing and when pore filling is required.

Remove dirt, stains, oil, wax, curing agent, whiteness, laitance, coating materials, etc. on the construction surface. If special chemicals are required for the removal of these foreign materials, the supplier shall do so according to specifications and perform the sealing within 48 hours after preparation of the construction surface.

Korean Patent Registration No. 10-354135 discloses a method for repairing internal reinforced concrete waterproofing of an underground structure for preventing water leakage and repairing and reinforcing the surface of a concrete that has been deteriorated and corroded by prolonged flooding, Permeable adhesive mixed with amino (1-oxo-1,6-hexanediyl), 2,2- (1-methylethylidene) bis (4,1- phenyleneoxymethylene), methylphenoxymethyl and water the surface mixed applying the enhancing agent to form a surface reinforcement and a first waterproof layer, and as said first blocking with an isocyanate on the waterproof layer of polyurethane, and amorphous silicon dioxide and calcium carbonate and trimethylene hexamethylene methicillin diamine and phenol alkylsulfonyl acid ester of applying a reinforcement waterproofing agent to form a surface reinforcement and a second waterproof layer and the second waterproof layer and on the unexposed polyimide (1-oxo-1,6-hexane-diyl), 2,2 (1-methyl butylidene) bis (4,1-phenyleneoxy Ethylene) bis and homopolymers, and the composite waterproof repair method the concrete walls are described for forming a surface protection and the third waterproof layer comprising a-methylphenoxymethyl and water,

Korean Patent Laid-Open Publication No. 2003-74180 discloses a composition comprising an inorganic curing additive consisting of sodium carbonate, potassium chloride, ammonium chloride, borax and distilled water, a surfactant containing sodium silicate, silicone or fluorine component, And uniformly applying nitric acid, sulfuric acid or citric acid to the applied surface, and a concrete surface treatment method and a composition for a concrete inorganic curing additive,

Korean Patent Laid-Open Publication No. 2003-71231 discloses a resin composition comprising a mixture of an epoxy resin or a modified epoxy resin, alumina or aluminum hydroxide, cement for cement, and a solvent, and a mixture of a polyamide resin or a modified amine resin or a modified aromatic amine resin And a mixed curing agent containing titanium dioxide, aluminum silicate and water, and then applying the undercoating material to the surface of the concrete. Thereafter, the surface of the concrete including the acrylic resin or the modified acrylic resin, titanium dioxide, polyester resin or modified polyester resin solvent It can be seen that a method of preventing the neutralization and deterioration of concrete in which a mixed material is mixed with a curing agent including a urethane resin or a modified urethane resin and a solvent to apply the top material to the top surface is disclosed.

1. Korean Patent Registration No. 10-354135 2. Published Korean Patent Application Publication No. 2003-74180 3. Published Korean Patent Application No. 2003-71231 4. Korean Patent Registration No. 10-0601882 5. Domestic Patent Registration No. 10-1001112

In the conventional methods as described above, the bases of sea breeze, sea water, and calcium chloride for snow removal penetrate into the concrete with time, and the concrete is corroded. When the base is infiltrated with moisture, the concrete is inflated to cause crack, And it can not sufficiently cover the pores caused by curing of concrete. Thus, it can not satisfy the use of various structures requiring high strength, waterproofness and durability, so that the strength is easily broken due to a decrease in strength when used in concrete buildings, especially on roads. Furthermore, The resistance to chemicals is also weakened, so that it can not withstand acid, alkali, salt, water and sunlight continuously,

The incontinence generated on the surface of the concrete structure is not a problem about the foundation equilibrium but the cement mixture is wrong or the mixture is not uniform due to the mixing phase on the construction, , And the problem of causing the deterioration and neutralization of the structure due to the leakage and losing the value of the product is a problem of the present invention.

In order to solve the above-mentioned problems, the present invention provides a method for preventing cracks, a composition for use therein, and a method for preventing cracks, which are disclosed in Korean Patent Application Nos. 10-2004-0029049 and 10-2004-0075597 filed by the present applicant, As a concrete surface strengthening agent,

The present invention is characterized in that the concrete powder is composed of 40% by weight of a concrete powder and 60% by weight of a surface strengthening agent. The concrete powder is composed of 40% by weight of a mixture of Portland cement, 25 kg, 25 kg of alumina cement, 5 kg of sodium carbonate, Wherein the surface reinforcing agent is composed of 70 kg of silane, 80 kg of acrylic resin, 5 kg of emulsifier and 1 kg of a dispersing agent. The present invention is intended to solve the problems of the prior art.

The present invention as described above removes microcracks and network cracks in concrete structures and has effects such as neutralization, strength enhancement and deterioration prevention of the surface strength deterioration part of the concrete structure. In addition, it prevents deterioration by concrete neutralization, It is advantageous that it can be used variously in civil engineering, building construction and maintenance field because it has the effect of increasing the strength, preventing the salting, increasing the strength of the concrete surface and increasing the abrasion.

In order to achieve the above object, the present invention provides a method for producing a concrete powder by mixing 40 wt% of a mixture of 25 kg of Portland cement, 25 kg of alumina cement, 5 kg of sodium carbonate, 3 kg of alum, and 5 kg of a silicic acid compound and 60 wt% Next, a surface strengthening agent composed of 70 kg of silane, 80 kg of acrylic resin, 5 kg of emulsifier and 1 kg of dispersant was prepared,

40% by weight of the concrete powder, 60% by weight of the surface strengthening agent, and microcrack repairing composition were prepared,

The microcracked portion was cut into a groove having a shape of 10 mm to 20 mm and then the residue and foreign matter were cleanly removed and then the microcracking repair composition of the concrete structure was sealed with the V cutting portion to form microcracks ) Water was diluted 1: 2 by weight with respect to the composition of the filler, and then poured and applied to the micro-cracked portion (coating amount: 1 kg / 2 mm 2) using any one of a roller and an injector and then dried after 1 hour The present invention relates to a microcrack repairing composition for a concrete structure which strengthens the surface of a microcrack (network crack) portion and prevents deterioration (chemical corrosion), and a method of construction thereof.

The fine crack repairing composition of the concrete structure of the present invention is composed of 40% by weight of a concrete powder and 60% by weight of a surface strengthening agent,

The concrete powder is composed of 40 wt% mixture of 25 wt% of Portland cement, 25 kg of alumina cement, 5 kg of sodium carbonate, 3 kg of alum stone and 5 kg of silicic acid compound and 60 wt% of silica sand (diameter 0.1-0.2 mm) Recycled materials, and new and old concrete adhesives.

The Portland cement or alumina cement of the present invention is used as an inorganic adhesive, and the alumina cement plays an auxiliary role as an expansion agent, and it is economical or suitable to use 25 kg of the portland cement and 25 kg of the alumina cement.

The anhydrous sodium carbonate used in the present invention is strong in the hygroscopicity of the white powder, and if it is more than 5 kg, it is not economical. If it is less than 5 kg, the properties of sodium carbonate are lowered.

The gabbrosite of the present invention is referred to as Baikolseok, and is a hexagonal system minerals. Sulfuric acid in the groundwater acts on the alumina rocks. The sulfuric acid acts on the volcanic rocks in translucent volcanic rocks, The composition is KAl ₃ (OH) ₆ (SO ₄ ) ₂ , which acts as a swelling agent,

If the total amount is more than 3 kg, the waterproof function is deteriorated. If it is less than 3 kg, the evaporation rate and solubility are insufficient,

The silicate-based compound of the present invention uses any one compound selected from sodium silicate, potassium silicate, lithium silicate and calcium silicate, and is used to penetrate deeply into cracks and broken parts of the concrete road. It is strong and uneconomical, and if it is too small, the performance deteriorates and 5 kg is preferable.

The silica sand according to the present invention has a diameter of 0.1 to 0.2 mm and serves as a curing agent. When it is too large, it is hardened. When it is too small, it is softened.

The surface strengthening agent of the present invention is composed of 70 kg of silane, 80 kg of acrylic resin, 5 kg of emulsifier and 1 kg of dispersant. The silane serves to enhance impact resistance and abrasion resistance, acrylic resin enhances permeability and water resistance, It is used to mix minerals and organic matter.

₂의 총칭. 단순히 실란이라 할 때는 n = 1의 화합물 SiH₄를 지칭한다. n = 2, 3 등의 화합물은 디실란, 트리실란 등이라 한다. SiH₄의 수소원자가 탄화수소기 등으로 치환한 유기 화합물을 총칭할 때도 실란이란 명칭이 사용된다. 어느 것이나 공기 중에서는 자연 발화하지만 공기를 차단하고 보존하면 상온에서도 안정하다. 대응하는 파라핀계 탄화수소에 비해서 뚜렷하게 불안정하여, 물수산화 알칼리 용액 등과 반응하거나 열분해를 받기 쉽다. 보통은 마그네슘의 분말과 규사의 고운 분말의 혼합물에 점화하여 생기는 규소화 마그네슘 Mg₂Si를 산으로 분해시키면 수소와 함께 혼합물이 생긴다. 수소를 알킬기할로겐수산기 등으로 치환한 유도체를 만들며, 유기 규소화합물의 모체로서 매우 중요하다. 극히 유독하다. SiH₄는 특이한 냄새가 나는 무색 기체로, 녹는점 -184.7℃, 끓는점 -112℃이다. 공기 중에서는 자연 발화한다. 수산화 알칼리 용액과 작용하여 수소를 발생하고 규산알칼리가 된다. 가열하면 분해하여 수소와 규소가 된다. 상온에서는 안정하다.[네이버 지식백과] 실란(실레인) [silane] (화학용어사전, 2011.1.15, 일진사)
Silane is a silicon hydride < RTI ID = 0.0 &

₂ collectively. When silane is simply referred to, the compound SiH4 is n = 1. The compound of n = 2, 3, etc. is called disilane, trisilane and the like. The term silane is also used when organic compounds in which hydrogen atoms of SiH4 are substituted with hydrocarbon groups or the like. All are spontaneously ignited in the air, but they are stable at room temperature if air is blocked and preserved. Is significantly unstable as compared with the corresponding paraffinic hydrocarbons, and is liable to react with water, an alkali hydroxide solution or the like or to undergo thermal decomposition. Normally, decomposition of magnesium silicate Mg2Si, which is produced by ignition of a mixture of magnesium powder and silica powder, with an acid results in a mixture with hydrogen. Hydrogen is substituted with an alkyl group halogen hydroxyl group, etc., and a derivative is very important as a host of an organosilicon compound. It is extremely toxic. SiH4 is a colorless gas with a characteristic odor, melting point -184.7 ℃, boiling point -112 ℃. It spontaneously ignites in the air. It reacts with an alkali hydroxide solution to generate hydrogen and become alkali silicate. When heated, it decomposes to hydrogen and silicon. Silane (Silane) (Chemical Dictionary, January 15, 2011, Iljin History)

The silane used in the present invention may be at least one selected from the group consisting of ethyltriethoxysilane, ethyltrimethoxysilane, ethyltri-n-propoxysilane, propyltriethoxysilane, propyltrimethylaminosilane, butyltriethoxysilane, Silane, isobutylethoxysilane, isobutyltrimethoxysilane, isobutyltriacetoxysilane, n-hexyltrimethoxysilane, 6-chlorotriethoxysilane, cyclohexyltriethoxysilane, benzyltriethoxysilane , Phenyltriethoxysilane, vinyltriethoxysilane, phenyltrimethoxysilane, octyltriethoxysilane, octylmethyldiisopropoxysilane, lauryltrimethoxysilane, 2-ethylhexyltrimethoxysilane, decyl Triethoxysilane, dodecyltribromosilane, tetradecyltrimethoxysilane, hexadecyltriethoxysilane, octadecyltriethoxysilane, dimer and trimer thereof, and oligomers thereof may be used in combination, four The capacity is 70 kg of the total weight.

The emulsifier used in the present invention acts as an emulsifying agent and keeps the anti-cracking agent in a stable state for a long period of time and improves the dispersing ability to improve uniform mixing and workability.

Lauryl ether ethylene oxide adduct, cetyl ether ethylene oxide adduct, stearyl ether ethylene oxide adduct, oleyl ether ethylene oxide adduct, octyl phenyl ether ethylene oxide adduct, nonyl phenyl ether ethylene oxide Adipic acid, adducts, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan tristearate, sorbitan monooleate, sorbitan trioleate, sorbitan sesquioleate, sorbitan distearate , Sorbitan monolaurate ethylene oxide adduct, sorbitan monopalmitate ethylene oxide adduct, sorbitan monostearate ethylene oxide adduct, sorbitan tristearate ethylene oxide adduct, sorbitan monooleate Ethylene oxide adducts, sorbitan trioleate ethylene oxide adducts, tetraoleic acid polyoxyethylene sorbitol, glycerol monostearate, Polyethylene glycol monooleate, polyethylene glycol monostearate, polyethylene glycol distearate, polyethylene glycol monooleate, polyethylene alkylamine, castor oil ethylene oxide adduct, hydrogenated castor oil ethylene oxide adduct or a mixture thereof with a polyisocyanate compound Non-ionic surfactants such as condensed condensates; Sulfuric acid ester salts of liquid fatty acids, sulfuric acid salts of aliphatic amines and aliphatic amides, phosphoric acid esters of aliphatic alcohols, sulfonic acid salts of dibasic acidic fatty acid esters, sulfonic acid salts of fatty acid amides, alkylarylsulfonic acids, Anionic surfactants such as formalin condensed naphthalate; Cationic surfactants such as primary amine salts, secondary amine salts, tertiary amine salts, quaternary amine salts, and pyridinium salts; An amphoteric surfactant such as a betaine type, a sulfuric acid ester type, and a sulfonic acid type, and the like.

If the blending amount of these emulsifiers is too much or too small, the function as an emulsifier can not be sufficiently exhibited, and a change in physical properties is a concern, and it is preferable to use 5 kg.

The acrylic resin used in the present invention is 80 kg of a compound selected from the group consisting of methyl acrylate, ethyl acrylate, isobutyl acrylate, methyl methacrylate, ethyl methacrylate and acrylonitrile,

The dispersant used in the present invention is a high molecular weight condensed naphthalenesulfonic acid sodium salt or naphthalenesulfonic acid calcium salt of 1 kg.

Water is used to make a liquid phase when used in an injector or applicator, and when the compounding amount is small, stability as a water dispersion product may not be maintained. The upper limit of the amount of water to be blended is not particularly limited, but it may be diluted depending on the application

Hereinafter, the present invention will be described in detail with reference to Examples.

Example

First step

25 kg of Portland cement, 25 kg of alumina cement, 5 kg of sodium carbonate, 3 kg of alum stone and 40 kg of a mixture mixed with 5 kg of silicic acid-based compound

And 60 wt% of silica sand (diameter 0.1 to 0.2 mm) were mixed to prepare a concrete powder,

70 kg of ethyltriethoxysilane as a silane, 80 kg of methyl methacrylate as an acrylic resin, 5 kg of sorbitan monolaurate as an emulsifier, and 1 kg of a calcium salt of naphthalenesulfonic acid as a dispersant were prepared,

40 kg of the concrete powder and 60 kg of the surface strengthening agent were stirred in a mixer for 30 minutes at 300 RPM with a stirrer to prepare a micro crack repair composition of the concrete structure,

Second Step

After the microcracks were cut into grooves having a shape of about 10 mm to 20 mm'V ', the residues and foreign substances were cleanly removed, and the microcracks were sealed with a microcracking repair composition of the concrete structure at the V-cutting site. (1 kg / 2 mm 2) was applied to the microcracked portion by using any one selected from the group consisting of water, water, diluted 1: 2 by weight and then poured and roller sprayer. It strengthened the surface of the crack (network crack) part and prevented the deterioration (chemical corrosion) and installed it to repair the micro crack (network crack) of the concrete structure.

The microcrack repairing composition of the concrete structure of the present invention manufactured as in the above embodiment is composed of 40% by weight of a concrete powder and 60% by weight of a surface strengthening agent,

The concrete powder was mixed with 40 kg of a mixture of 5 kg of a silicate compound, which is a compound selected from Portland cement, 25 kg, 25 kg of alumina cement, 5 kg of sodium carbonate, 3 kg of alum, sodium silicate, potassium silicate, lithium silicate and calcium silicate, (Diameter 0.1 to 0.2 mm) of 60% by weight,

The surface strengthening agent was prepared by mixing 70 kg of silane, 80 kg of an acrylic resin which is one of compounds selected from methyl acrylate, ethyl acrylate, isobutyl acrylate, methyl methacrylate, ethyl methacrylate and acrylonitrile, 5 kg of an emulsifier, As shown in FIG.

Experimental Example 1

As shown in Table 1 and Table 2, the concrete structure constructed with the micro crack repair composition of the concrete structure was tested by the Korea Research Institute of Chemical Technology.

Company name: Hanil Pienti Co., Ltd.

Address: 420-5, Sujeong-ri, Kunbuk-myeon, Okcheon-gun, Chungbuk

Test result Test Items unit Sample classification Results Test Methods Bond strength N / mm < 2 & 72  KS F 4916: 2004 Tensile strength (28 days) N / mm < 2 & 2.4  KS L 5104: 2006 Length change rate % 0.005  KS F 4916: 1999 Absorption rate % 4  KS F 4916: 2004 Impact resistance - clear  KS F 4716: 2001 My alkalinity - clear  KS L 1001: 2003

Formulation (kg)

Water: Cement: Sand: HP200

10%
w / c = 42%: 1: 3: C

10%

Certificate Number: TAS-011690 Received on: February 20, 2014

Key words: Kim Jae Ae test completion date: March 14, 2014

Company name: Hanil Pienti Co., Ltd.

Address: 420-5, Sujeong-ri, Kunbuk-myeon, Okcheon-gun, Chungbuk

Test result Test Items unit Sample classification Results Test Methods Condensation time (seconds) minute - 7  KS F 5108: 2007 Condensation time (Closing) minute - 10  KS F 5108: 2007 Compressive strength (2 hours) N / mm < 2 & - 16.6  KS F 4042: 2012 Compressive strength (4 hours) N / mm < 2 & - 18.9  KS F 4042: 2012 Compressive strength (24 hours) N / mm < 2 & - 22.2  KS F 4042: 2012 Compressive strength (3 days) N / mm < 2 & - 40.2  KS F 4042: 2012 Bond strength (3 days) N / mm < 2 & - 1.8  KS F 4042: 2012

According to the results of the experiment as described above, the present invention shows that the permeability, the water absorption property, the water permeability and the like pass the KS standard specification test standard.

Claims (4)

In a micro crack repair composition of a concrete structure,
40% by weight of a concrete powder and 60% by weight of a surface strengthening agent,
The concrete powder is Portland cement 25kg, alumina cement, 25kg, sodium carbonate 5kg, myeongbanseok 3kg, sodium silicate, potassium silicate, lithium silicate, any of the compounds of silicate-based a mixture of 40% by weight of silica mixed in the compound 5kg selected from the group consisting of calcium silicate, 60 % & Lt; / RTI >
The surface strengthening agent was prepared by mixing 70 kg of silane, 80 kg of an acrylic resin which is one of compounds selected from methyl acrylate, ethyl acrylate, isobutyl acrylate, methyl methacrylate, ethyl methacrylate and acrylonitrile, 5 kg of an emulsifier, Wherein the microcrack-repairing composition of claim 1,
[3] The method of claim 1, wherein the silane is selected from the group consisting of ethyltriethoxysilane, ethyltrimethoxysilane, ethyltri-n-propoxysilane, propyltriethoxysilane, propyltrimethylaminosilane, butyltriethoxysilane, Hexyltrimethoxysilane, isobutyltrimethoxysilane, isobutyltrimethoxysilane, isobutyltriethoxysilane, n-hexyltrimethoxysilane, 6-chlorotriethoxysilane, cyclohexyltriethoxysilane, benzyltriethoxy Silane, phenyltriethoxysilane, vinyltriethoxysilane, phenyltrimethoxysilane, octyltriethoxysilane, octylmethyldiisopropoxysilane, lauryltrimethoxysilane, 2-ethylhexyltrimethoxysilane, Decyltriethoxysilane, dodecyltribromosilane, tetradecyltrimethoxysilane, hexadecyltriethoxysilane, octadecyltriethoxysilane, dimer and trimer thereof, and oligomers thereof may be used in combination. To Wherein the fine crack repairing composition is a micro crack repairing composition.
delete A method of repairing and installing fine cracks in a concrete structure,
40 wt% of a mixture of 25 kg of Portland cement, 25 kg of alumina cement, 5 kg of sodium carbonate, 3 kg of alum, and 5 kg of a silicic acid compound was mixed with 60 wt% of silica sand to prepare a concrete powder,
70 kg of silane, 80 kg of acrylic resin, 5 kg of emulsifier and 1 kg of dispersant were prepared,
A composition of 40 wt% of the concrete powder, 60 wt% of the surface strengthening agent, and microcrack repairing agent was prepared,
The microcracked portion was cut into a groove having a shape of 10 mm to 20 mm and then the residue and foreign matter were cleanly removed and then the microcracking repair composition of the concrete structure was sealed with the V cut portion to form the microcrack repairing composition of the concrete structure (1 kg / 2 mm 2) was sprayed onto the cracked portion by any one of pouring, roller or spraying, and then dried after 1 hour to remove the surface of the microcracked portion Reinforcing and preventing deterioration of the concrete structure.