KR20190029112A - Crack repairing stick and manufacturing method thereof - Google Patents

Crack repairing stick and manufacturing method thereof Download PDF

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KR20190029112A
KR20190029112A KR1020170116251A KR20170116251A KR20190029112A KR 20190029112 A KR20190029112 A KR 20190029112A KR 1020170116251 A KR1020170116251 A KR 1020170116251A KR 20170116251 A KR20170116251 A KR 20170116251A KR 20190029112 A KR20190029112 A KR 20190029112A
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silica fume
stick
composition
water
crack
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KR1020170116251A
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Korean (ko)
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KR102051400B1 (en
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김락현
이창홍
이재록
배상규
김삼현
최성민
신상용
조규용
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주식회사 포스코건설
주식회사 케이알티
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Priority to KR1020170116251A priority Critical patent/KR102051400B1/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/16Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing anhydrite, e.g. Keene's cement
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00Producing shaped prefabricated articles from the material
    • B28B1/14Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/245Curing concrete articles
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02Granular materials, e.g. microballoons
    • C04B14/04Silica-rich materials; Silicates
    • C04B14/10Clay
    • C04B14/104Bentonite, e.g. montmorillonite
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04Waste materials; Refuse
    • C04B18/14Waste materials; Refuse from metallurgical processes
    • C04B18/141Slags
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04Waste materials; Refuse
    • C04B18/14Waste materials; Refuse from metallurgical processes
    • C04B18/146Silica fume
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/002Water
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/02Alcohols; Phenols; Ethers
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/4578Coating or impregnating of green ceramics or unset concrete
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0203Arrangements for filling cracks or cavities in building constructions
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/72Repairing or restoring existing buildings or building materials
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • Electrochemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The present invention provides a concrete surface crack repairing stick manufactured by a composition (A) containing: 47-56 wt% of cement; 15-23 wt% of slag; 2.5-4.5 wt% of anhydrous gypsum; 4-20 wt% of silica fume; 2.5-4.5 wt% of bentonite; 0.1-0.3 wt% of a powder type fluidizing agent; 8-10 wt% of water; and 3-5 wt% of alcohol. According to the silica fume of the present invention, a silica fume byproduct, which is fine particles generated in a process of manufacturing ferrosilicon, is made into grains by being compressed to have bulk specific gravity of 500-650 kg/m^3. Distribution level drops and strength is lowered if the fine particle silica fume generated in manufacturing ferrosilicon is used in the composition in an initial state (130-430 kg/m^3) thereof. The present invention compresses the fine particle silica fume with the bulk specific gravity of 500-650 kg/m^3 in order to increase compression strength, bending strength and adhesion strength of the composition and enhance distribution and mixing level when the composition is mixed. In addition, copper smelting slag is slag remaining after copper smelting and has an amorphous property like the silica fume. Therefore, the present invention induces a pozzolan reaction and enhances compression strength and bending strength of a composition for a surface crack repairing stick by mixing Al_2O_3-SiO_2-CaO based copper smelting slag with the composition.

Description

콘크리트 표면 균열 보수용 스틱 및 그 제조방법{CRACK REPAIRING STICK AND MANUFACTURING METHOD THEREOF}Technical Field [0001] The present invention relates to a concrete surface crack repairing stick and a manufacturing method thereof. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

본 발명은 건설분야에 관한 것으로서, 상세하게는 콘크리트 표면 균열 보수용 스틱 및 그 제조방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction field, and more particularly, to a concrete surface crack repairing stick and a manufacturing method thereof.

콘크리트 구조물은 수화반응에 의해 경화되는데, 수화반응시 증발되는 수분에 의해 표면에 균열이 발생한다.The concrete structure is hardened by hydration reaction, and cracks are generated on the surface by the water evaporated during hydration reaction.

이를 방지하기 위하여 콘크리트 구조물의 양생 동안 콘크리트 구조물에 증기를 쏘이거나 표면에 수분을 공급하고 있으나 미세균열은 여전히 발생하고 있다.In order to prevent this, the concrete structure is sprayed with steam or water is supplied to the surface during the curing of the concrete structure, but microcracks still occur.

0.2mm 이상의 균열은 구조적 결함을 유발하기 때문에 균열부를 보강하고 있지만 0.2mm 이하의 균열이 발생한 곳은 보수재(물+시멘트)를 표면에 발라 균열부를 마감하고 있다.Cracks of 0.2 mm or more cause structural defects, so cracks are reinforced, but cracks of 0.2 mm or less are generated by applying repair material (water + cement) to the surface to complete the cracks.

그러나 보수재를 이용하는 균열부의 마감처리는 보수재를 배합하는 작업자에 따라 보수재의 품질에 차이가 발생하고, 작업후 보수재가 탈락하거나 균열부에 충분히 침투하지 못하는 문제가 발생하고 있다.However, in the finishing treatment of the cracked portion using the repair material, there is a problem that the quality of the repair material varies depending on the operator who blends the repair material, and the repair material does not fall off or can not sufficiently penetrate into the cracked portion.

본 발명은 상기와 같은 문제를 해결하기 위해 고안된 것으로서, 작업자에 따른 보수재의 품질저하를 방지함은 물론 보수 작업후 보수재가 탈락하지 않는 콘크리트 표면 균열 보수용 스틱 및 그 제조방법을 제시한다.The present invention has been devised to solve the above problems, and it suggests a stick for repairing concrete surface cracks which does not deteriorate the quality of the repairing material according to the operator and does not fall off after the repairing work, and a manufacturing method thereof.

상기 과제의 해결을 위하여, 본 발명의 콘크리트 표면 균열 보수용 스틱은 시멘트 47~56 중량%; 슬래그 15~23 중량%; 무수석고 2.5~4.5 중량%; 실리카퓸 4~20 중량%; 벤토나이트 2.5~4.5 중량%; 분말형 유동화제 0.1~0.3중량%; 물 8~10중량%; 알코올 3~5중량%;를 포함하는 조성물(A)로 제조된다.In order to solve the above problems, the concrete surface crack repairing stick of the present invention comprises 47 to 56% by weight of cement; 15 to 23% by weight of slag; 2.5 to 4.5 wt% of anhydrous gypsum; 4 to 20% by weight of silica fume; 2.5 to 4.5 wt% bentonite; 0.1 to 0.3% by weight of a powdery fluidizing agent; 8 to 10% by weight of water; And 3 to 5% by weight of an alcohol.

상기 슬래그는 동제련슬래그와 고로슬래그가 혼합된 것이 바람직하다.The slag is preferably a mixture of copper smelting slag and blast furnace slag.

상기 실리카퓸은 고순도 규소철(Fe-si)의 생산과정에서 발생하는 부산물을 집진하여 반압축 상태로 압축한 것으로서, 부피비중이 500~650kg/㎥인 것이 바람직하다.The silica fume is obtained by collecting by-products generated during the production of high-purity silicon iron (Fe-Si) and compressing it in a semi-compression state, and preferably has a volume specific gravity of 500 to 650 kg / m 3.

상기 실리카퓸은 비표면적이 13,000~17,000㎡/kg인 것이 바람직하다.The silica fume preferably has a specific surface area of 13,000 to 17,000 m 2 / kg.

상기 벤토나이트는 Al2O3계 또는 SiO2계 중 어느 하나인 것이 바람직하다.It is preferable that the bentonite is any one of Al 2 O 3 system and SiO 2 system.

본 발명의 일 실시 예에 따른 콘크리트 표면 균열 보수용 스틱(10) 제조방법은 상기 실리카퓸과 상기 물을 혼합하여 상기 실리카퓸을 슬러리화하는 실리카퓸슬러리화단계; 상기 시멘트, 상기 슬래그, 상기 무수석고, 상기 벤토나이트, 상기 분말형 유동화제, 상기 알코올, 상기 물을 슬러리화되어 있는 상기 실리카퓸과 혼합하여 상기 조성물(A)을 혼합하는 혼합단계; 상기 조성물(A)을 상기 콘크리트 표면 균열 보수용 스틱(10)의 제작용 몰드(1)에 투입하는 몰드투입단계; 초기 수화반응을 촉진함과 아울러, 상기 스틱(10) 내부의 수분을 증발시켜 완전 수화반응을 억제하도록 고온으로 상기 조성물(A)을 건조하는 고온경화단계; 상기 스틱(10) 내부의 잔여 수분을 완전히 경화시키기 위해 전자파를 이용하여 건조하는 전자파경화단계;를 포함한다.A method for manufacturing a concrete surface crack repairing stick (10) according to an embodiment of the present invention includes: a silica fume slurrying step of slurrying the silica fume by mixing the silica fume with the water; Mixing the composition (A) by mixing the cement, the slag, the anhydrous gypsum, the bentonite, the powdery fluidizing agent, the alcohol, and the water with the slurryed silica fume; A mold injecting step of injecting the composition (A) into a mold (1) for producing a concrete surface crack repairing concrete (10); A high temperature curing step of accelerating the initial hydration reaction and drying the composition (A) at a high temperature so as to evaporate water in the stick 10 to suppress the hydration reaction; And an electromagnetic wave curing step of drying using the electromagnetic wave to completely cure the residual moisture in the stick 10.

상기 고온경화단계는 상기 몰드(1)에 투입된 상기 조성물(A)을 100~110℃의 온도에서 2~3시간 동안 건조하는 것이 바람직하다.In the high-temperature curing step, the composition (A) charged into the mold (1) is preferably dried at a temperature of 100 to 110 ° C for 2 to 3 hours.

상기 전자파경화단계는 주파수가 2250~2650Mhz인 건조장치(2)에서 상기 고온경화단계 이후의 상기 조성물(A)을 건조하는 것이 바람직하다.Preferably, the electromagnetic wave curing step is to dry the composition (A) after the high temperature curing step in a drying apparatus (2) having a frequency of 2250 to 2650 MHz.

상기 전자파경화단계는 0.5~5분간 건조하는 것이 바람직하다.The electromagnetic wave curing step is preferably performed for 0.5 to 5 minutes.

상기 실리카퓸슬러리화단계는 상기 실리카퓸 중량의 2~3배인 상기 물을 먼저 혼합하는 것이 바람직하다.Preferably, the silica fume slurrying step is performed by mixing the water having a weight of 2 to 3 times the silica fume weight.

본 발명의 일 실시 예에 따른 균열 보수용 스틱(10)을 이용한 콘크리트 표면 보수방법은 균열(101)이 발생한 콘크리트 구조물(100)의 표면 균열부(111)를 정리하는 표면정리단계; 상기 균열부(111)의 표면에 물을 분사하여 상기 균열(101)에 물을 침투시키는 물분사단계; 상기 균열 보수용 스틱(10)을 상기 균열부(111)에 문질러 상기 균열 보수용 스틱(10) 가루가 상기 균열(101)의 내부로 침투시키는 스틱처리단계; 표면처리장치(20)를 이용하여 상기 스틱(10) 가루가 침투된 상기 균열(101)의 표면을 정리하는 표면처리단계; 상기 균열(101) 내부에 침투된 상기 물과 상기 스틱(10) 가루가 상호 접촉하여 경화되는 경화단계;를 포함한다.The method of repairing a concrete surface using a crack repair stick 10 according to an embodiment of the present invention includes a surface cleaning step of arranging a surface crack part 111 of a concrete structure 100 in which a crack 101 is generated; A water spraying step of spraying water onto the surface of the crack part (111) to infiltrate water into the crack (101); A stick treating step of rubbing the crack repairing stick 10 against the cracking portion 111 to infiltrate the crack repairing stick 10 into the crack 101; A surface treatment step of arranging a surface of the crack (101) into which the stick (10) has penetrated using the surface treatment apparatus (20); And a curing step of curing the water penetrated into the cracks (101) and the powder of the stick (10) in contact with each other.

상기 표면처리장치(20)는 손가락에 끼워지는 골무 타입으로 형성된 것이 바람직하다.It is preferable that the surface treatment apparatus 20 is formed as a thimble type to be fitted on a finger.

본 발명인 콘크리트 표면 균열 보수용 스틱은 휴대성이 용이하고, 작업자의 능숙도에 상관 없이 동일한 보수가 가능하다.The concrete surface crack repairing stick of the present invention is easy to carry and can perform the same repair irrespective of the skill of the operator.

또한, 균열 보수용 스틱을 이용한 콘크리트 표면 보수공정이 용이하여, 작업성이 우수하고, 보수시간을 단축할 수 있다.Also, the concrete surface repairing process using the crack repair stick is easy, and the workability is excellent and the repairing time can be shortened.

도 1은 본 발명의 일 실시 예에 따른 균열 보수용 스틱(10) 사시도.
도 2는 본 발명의 일 실시 예에 따른 균열 보수용 스틱 제작용 몰드 평면도.
도 3은 균열이 발생한 콘크리트 구조물을 나타내는 사시도.
도 4는 본 발명의 일 실시 예에 따른 표면정리단계 공정도.
도 5는 본 발명의 일 실시 예에 따른 균열부에 물을 분사하는 것을 나타내는 도면.
도 6은 본 발명의 일 실시 예에 따른 물 분사단계 공정도.
도 7은 본 발명의 일 실시 예에 따른 스틱처리단계 공정도.
도 8은 본 발명의 일 실시 예에 따른 표면처리단계 공정도.
도 9는 본 발명의 일 실시 예에 따른 콘크리트 표면 보수공법에 의해 보수가 완료된 콘크리트 구조물을 나타내는 도면.
1 is a perspective view of a crack repairing stick 10 according to an embodiment of the present invention.
2 is a plan view of a mold for producing a stick for repairing cracks according to an embodiment of the present invention.
3 is a perspective view showing a concrete structure in which cracks have occurred.
4 is a process flow diagram of a surface cleanup step according to an embodiment of the present invention.
5 illustrates spraying water onto a crack according to an embodiment of the present invention.
6 is a process diagram of a water injection step according to an embodiment of the present invention.
7 is a process diagram of a stick processing step according to an embodiment of the present invention.
8 is a process flow diagram of a surface treatment step according to an embodiment of the present invention.
9 is a view showing a concrete structure that has been repaired by a concrete surface repair method according to an embodiment of the present invention.

본 발명에 따른 콘크리트 표면 균열 보수용 스틱 및 그 제조방법의 일 실시 예를 첨부도면을 참조하여 상세히 설명하기로 하며, 첨부 도면을 참조하여 설명함에 있어, 동일하거나 대응하는 구성 요소는 동일한 도면 번호를 부여하고 이에 대해 중복되는 설명은 생략하기로 한다.1 is a perspective view of a concrete surface crack repairing stick according to an embodiment of the present invention; FIG. 2 is a perspective view of a concrete surface crack repairing stick according to an embodiment of the present invention; And duplicate description thereof will be omitted.

또한, 이하 사용되는 제1, 제2 등과 같은 용어는 동일 또는 상응하는 구성 요소들을 구별하기 위한 식별 기호에 불과하며, 동일 또는 상응하는 구성 요소들이 제1, 제2 등의 용어에 의하여 한정되는 것은 아니다.It is also to be understood that the terms first, second, etc. used hereinafter are merely reference numerals for distinguishing between identical or corresponding components, and the same or corresponding components are defined by terms such as first, second, no.

또한, 결합이라 함은, 각 구성 요소 간의 접촉 관계에 있어, 각 구성 요소 간에 물리적으로 직접 접촉되는 경우만을 뜻하는 것이 아니라, 다른 구성이 각 구성 요소 사이에 개재되어, 그 다른 구성에 구성 요소가 각각 접촉되어 있는 경우까지 포괄하는 개념으로 사용하도록 한다.In addition, the term " coupled " is used not only in the case of direct physical contact between the respective constituent elements in the contact relation between the constituent elements, but also means that other constituent elements are interposed between the constituent elements, Use them as a concept to cover each contact.

이하, 첨부도면을 참조하여 본 발명의 일 실시 예에 따른 콘크리트 표면 균열 보수용 스틱 및 그 제조방법에 관하여 상세히 설명한다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a concrete surface crack repairing stick and a manufacturing method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

본 발명의 콘크리트 표면 균열 보수용 스틱은 시멘트 47~56 중량%; 슬래그 15~23 중량%; 무수석고 2.5~4.5 중량%; 실리카퓸 4~20 중량%; 벤토나이트 2.5~4.5 중량%; 분말형 유동화제 0.1~0.3중량%; 물 8~10중량%; 알코올 3~5중량%;를 포함하는 조성물(A)로 제조된다.The concrete surface crack repairing stick of the present invention comprises 47 to 56% by weight of cement; 15 to 23% by weight of slag; 2.5 to 4.5 wt% of anhydrous gypsum; 4 to 20% by weight of silica fume; 2.5 to 4.5 wt% bentonite; 0.1 to 0.3% by weight of a powdery fluidizing agent; 8 to 10% by weight of water; And 3 to 5% by weight of an alcohol.

슬래그는 동제련슬래그와 고로슬래그가 혼합된 것이 바람직하다.The slag is preferably a mixture of copper smelting slag and blast furnace slag.

실리카퓸은 고순도 규소철(Fe-si)의 생산과정에서 발생하는 부산물을 집진하여 반압축 상태로 압축한 것으로서, 부피비중이 500~650kg/㎥인 것이 바람직하다.Silica fume is a product obtained by collecting by-products generated during the production of high purity silicon iron (Fe-Si) and compressing it in a semi-compression state, and preferably has a bulk specific gravity of 500 to 650 kg / m 3.

실리카퓸은 비표면적이 13,000~17,000㎡/kg인 것이 바람직하다.The silica fume preferably has a specific surface area of 13,000 to 17,000 m 2 / kg.

벤토나이트는 Al2O3계 또는 SiO2계 중 어느 하나인 것이 바람직하다.The bentonite is preferably one of Al 2 O 3 -based or SiO 2 -based.

이 경우, 본 발명의 실리카퓸은 규소철 생산과정에서 발생하는 미분의 실리카퓸 부산물을 500~650kg/㎥인 부피비중을 갖도록 압축하여 알갱이로 만들어진 것이다.In this case, the silica fume of the present invention is made of granules by compressing the silica fume by-product of the fine powder generated during the production of silicon iron to have a bulk specific gravity of 500 to 650 kg / m 3.

규소철 생산과정에서 발생한 실리카퓸 미분을 초기 상태(130~430kg/㎥) 그대로 조성물에 혼합하여 사용할 경우, 실리카퓸의 분산 정도가 떨어지고, 강도가 저하되는 문제가 발생한다.When the silica fume fine powder produced in the production of silicon iron is mixed with the composition as it is in the initial state (130 to 430 kg / m 3), the degree of dispersion of silica fume is lowered and the strength is lowered.

그러나 본 발명에서는 조성물의 압축강도, 휨강도 및 부착강도를 증진시키ㄱ기 위해 부피비중이 500~650kg/㎥의 범위를 갖는 실리카퓸 미분을 조성물에 혼합한다.However, in the present invention, a silica fume fine powder having a volume specific gravity of 500 to 650 kg / m < 3 > is mixed into the composition in order to improve the compressive strength, bending strength and adhesion strength of the composition.

또한, 동제련슬래그는 동을 제련하고 남은 슬래그로서, 실리카퓸과 같이 비정질의 특징을 가지고 있다.Moreover, the copper smelting slag is an amorphous material such as silica fume, which is the remaining slag after refining copper.

따라서, Al2O3-SiO2-CaO계인 동제련슬래그를 표면 균열 보수용 스틱 조성물에 혼합하여 포졸란 반응을 유도하고, 조성물의 압축강도와 휨강도를 향상시킨다.Therefore, a copper smelting slag, such as Al 2 O 3 -SiO 2 -CaO, is mixed with a surface crack repairing stick composition to induce a pozzolanic reaction to improve the compressive strength and flexural strength of the composition.

본 발명의 일 실시 예에 따른 콘크리트 표면 균열 보수용 스틱(10) 제조방법은 실리카퓸과 물을 혼합하여 실리카퓸을 슬러리화하는 실리카퓸슬러리화단계; 기 시멘트, 슬래그, 무수석고, 벤토나이트, 분말형 유동화제, 알코올, 물을 슬러리화되어 있는 실리카퓸과 혼합하여 조성물(A)을 혼합하는 혼합단계; 조성물(A)을 콘크리트 표면 균열 보수용 스틱(10)의 제작용 몰드(1)에 투입하는 몰드투입단계; 초기 수화반응을 촉진함과 아울러, 스틱(10) 내부의 수분을 증발시켜 완전 수화반응을 억제하도록 고온으로 조성물(A)을 건조하는 고온경화단계; 스틱(10) 내부의 잔여 수분을 완전히 경화시키기 위해 전자파를 이용하여 건조하는 전자파경화단계;를 포함한다.A method of manufacturing a concrete surface crack repairing stick (10) according to an embodiment of the present invention includes: a silica fume slurrying step of slurrying silica fume by mixing silica fume and water; Mixing the composition (A) by mixing the cement, slag, anhydrous gypsum, bentonite, powdery fluidizing agent, alcohol, and water with the slurryed silica fume; A mold injecting step of injecting the composition (A) into a mold (1) for making a concrete surface crack repairing stick (10); A high temperature curing step of accelerating the initial hydration reaction and drying the composition (A) at a high temperature so as to evaporate moisture inside the stick 10 to suppress the complete hydration reaction; And an electromagnetic wave hardening step of drying the residual moisture in the stick 10 using electromagnetic waves to completely cure the moisture.

실리카퓸슬러리화단계는 실리카퓸 중량의 2~3배인 물을 먼저 혼합하는 것이 바람직하다.In the silica fume slurrying step, it is preferable to first mix water having a weight of 2 to 3 times the weight of silica fume.

고온경화단계는 몰드(1)에 투입된 조성물(A)을 100~110℃의 온도에서 2~3시간 동안 건조하는 것이 바람직하다.In the high temperature curing step, the composition (A) charged into the mold (1) is preferably dried at a temperature of 100 to 110 DEG C for 2 to 3 hours.

이 경우, 본 발명은 몰드투입단계이후, 조성물(A)의 초기경화를 유도함과 아울러, 조성물 내부의 수분을 증발시키기 위해 100~110℃의 온도에서 2~3시간 동안 건조하는 고온경화단계를 실시한다.In this case, the present invention performs a high-temperature curing step of inducing initial curing of the composition (A) and then drying the composition at a temperature of 100 to 110 ° C for 2 to 3 hours to evaporate moisture inside the composition do.

이는 균열 보수용 스틱(10)으로 콘크리트 균열부를 보수할 때, 균열부에 도포되어 있는 수분과 스틱(10) 가루가 수화반응 하여 경화되도록 유도하기 위함이다.This is to induce water to be applied to the cracks and the stick 10 to hydrate and cure when repairing the concrete crack with the crack repairing stick 10.

즉, 고온으로 조성물(A) 내부에 존재하는 수분을 증발시켜 수화반응을 통하여 조성물(A)의 완전경화를 억제하고, 콘크리트 균열부에 스틱(10)이 가루로 투입될 때 미리 뿌려진 물과 반응하여 경화되도록 유도한 것이다.That is, it is possible to suppress the complete curing of the composition (A) through hydration reaction by evaporating the moisture present in the composition (A) at a high temperature, and to prevent the concrete from cracking when the stick (10) To induce curing.

전자파경화단계는 주파수 2250~2650Mhz인 건조장치(2)에서 고온경화단계 이후의 조성물(A)을 건조하는 것이 바람직하다.In the electromagnetic wave curing step, it is preferable to dry the composition (A) after the high temperature curing step in the drying apparatus (2) having a frequency of 2250 to 2650 MHz.

전자파경화단계는 0.5~5분간 건조하는 것이 바람직하다.The electromagnetic wave curing step is preferably carried out for 0.5 to 5 minutes.

이 경우, 전자파경화단계는 가열형으로 조성물(A)을 건조시키는 것이 아니라 전자파를 통해 조성물(A) 내부에 존재하는 수분을 완전히 건조하게 된다.In this case, the electromagnetic wave hardening step does not dry the composition (A) in the heating type, but completely dries the moisture present in the composition (A) through electromagnetic waves.

고온형의 가열장치를 사용할 경우, 표면부터 경화되기 때문에 내측에 존재하는 수분을 완전히 제거하지 못하게 된다.When a high-temperature type heating apparatus is used, since moisture is hardened from the surface, water present inside can not be completely removed.

그러나 본 발명은 전자파를 이용하여 표면이 경화된 조성물(A)의 내부를 완전히 경화하게 된다.However, the present invention completely cures the inside of the composition (A) whose surface is hardened by using electromagnetic waves.

본 발명의 일 실시 예에 따른 균열 보수용 스틱(10)을 이용한 콘크리트 표면 보수방법은 균열(101)이 발생한 콘크리트 구조물(100)의 표면 균열부(111)를 정리하는 표면정리단계; 균열부(111)의 표면에 물을 분사하여 균열(101)에 물을 침투시키는 물분사단계; 균열 보수용 스틱(10)을 균열부(111)에 문질러 균열 보수용 스틱(10) 가루가 균열(101)의 내부로 침투시키는 스틱처리단계; 표면처리장치(20)를 이용하여 스틱(10) 가루가 침투된 균열(101)의 표면을 정리하는 표면처리단계; 균열(101) 내부에 침투된 물과 스틱(10) 가루가 상호 접촉하여 경화되는 경화단계;를 포함한다.The method of repairing a concrete surface using a crack repair stick 10 according to an embodiment of the present invention includes a surface cleaning step of arranging a surface crack part 111 of a concrete structure 100 in which a crack 101 is generated; A water spraying step of spraying water on the surface of the cracks 111 to penetrate the water into the cracks 101; A stick treating step of rubbing the crack repairing stick 10 against the cracking portion 111 to infiltrate the crack repairing stick 10 into the crack 101; A surface treatment step of cleaning the surface of the crack (101) into which the stick (10) has been infiltrated using the surface treatment apparatus (20); And a curing step in which the water penetrated into the crack 101 and the stick 10 are cured by mutual contact.

표면처리장치(20)는 손가락에 끼워지는 골무 타입으로 형성된 것이 바람직하다.It is preferable that the surface treatment apparatus 20 is formed as a thimble type to be fitted on a finger.

이 경우, 본 발명은 콘크리트 균열부(111)에 물을 분사하고, 균열 보수용 스틱(10)을 균열부(111)에 문질러 균열 보수용 스틱(10) 가루를 균열(101) 내부로 침투 시킨다.In this case, according to the present invention, water is sprayed to the concrete cracking section 111, the crack repairing stick 10 is rubbed to the cracking section 111 to infiltrate the crack repairing stick 10 into the crack 101 .

균열(101) 내부로 침투된 균열 보수용 스틱(10) 가루는 균열부(111)에 분사된 물과 반응하여 경화된다. The crack repairing stick 10 powder penetrated into the crack 101 reacts with the water sprayed to the cracking portion 111 and hardens.

아래 표 1은 조성물(A)의 성능검증을 위한 실시예와 비교예의 배합비를 나타낸 것이다.Table 1 below shows the blending ratios of Examples and Comparative Examples for verifying the performance of the composition (A).

시멘트
(중량%)
cement
(weight%)
슬래그
(중량%)
Slag
(weight%)
무수석고
(중량%)
Anhydrous plaster
(weight%)
실리카퓸
(중량%)
Silica fume
(weight%)
벤토
나이트
(중량%)
Bento
Night
(weight%)
유동화제
(중량%)
Fluidizing agent
(weight%)

(중량%)
water
(weight%)
알코올
(중량%)
Alcohol
(weight%)
실시예Example 51.551.5 20.620.6 3.23.2 88 3.33.3 0.20.2 9.49.4 3.83.8 비교예Comparative Example 59.559.5 20.620.6 3.23.2 -- 3.33.3 0.20.2 9.49.4 3.83.8

아래 표 2는 KS F 4042 기준에 의한 보수용 모르타르의 압축강도 시험에 대한 비교예와 실시예의 결과이다.Table 2 below shows the results of the comparative examples and the examples of the compressive strength test of the repair mortar according to the KS F 4042 standard.

KS F 4042 기준Based on KS F 4042 실시예Example 비교예Comparative Example 압축강도(MPa)Compressive strength (MPa) 20 이상20 or more 29.829.8 21.621.6

아래 표 3은 KS F 4042 기준에 의한 보수용 모르타르의 휨강도 시험에 대한 비교예와 실시예의 결과이다.Table 3 below shows the results of the comparative examples and the examples of the bending strength test of the repair mortar according to KS F 4042 standard.

KS F 4042 기준Based on KS F 4042 실시예Example 비교예Comparative Example 휨 강도(MPa)Flexural Strength (MPa) 6 이상6 or more 7.97.9 6.36.3

아래 표 4는 KS F 4042 기준에 의한 보수용 모르타르의 부착강도 시험에 대한 비교예와 실시예의 결과이다.Table 4 below shows the results of the comparative examples and the examples of the adhesion strength test of the repair mortar according to the KS F 4042 standard.

KS F 4042 기준Based on KS F 4042 실시예Example 비교예Comparative Example 부착강도
(MPa)
Bond strength
(MPa)
표준조건Standard condition 1 이상1 or more 1.71.7 1.51.5
온냉반복Repeat warm-cold 1 이상1 or more 1.51.5 1.31.3

아래 표 5는 KS F 4042 기준에 의한 보수용 모르타르의 내알칼리성 시험에 대한 비교예와 실시예의 결과이다.Table 5 below shows the results of the comparative examples and the examples of the alkali resistance test of the repair mortar according to the KS F 4042 standard.

KS F 4042 기준Based on KS F 4042 실시예Example 비교예Comparative Example 내알칼리성(MPa)Alkali resistance (MPa) 20 이상20 or more 4242 3636

아래 표 6은 KS F 4042 기준에 의한 보수용 모르타르의 투수량 시험에 대한 비교예와 실시예의 결과이다.Table 6 below shows the results of the comparative examples and the examples of the water permeability test of the repair mortar according to the KS F 4042 standard.

KS F 4042 기준Based on KS F 4042 실시예Example 비교예Comparative Example 투수량(g)Permeability (g) 20 이하20 or less 2.22.2 3.43.4

아래 표 7은 KS F 4042 기준에 의한 보수용 모르타르의 물 흡수계수 시험에 대한 비교예와 실시예의 결과이다.Table 7 below shows the results of the comparative examples and the examples of the water absorption coefficient test of the repair mortar according to KS F 4042 standard.

KS F 4042 기준Based on KS F 4042 실시예Example 비교예Comparative Example 물흡수계수Water absorption coefficient 0.5 이하0.5 or less 0.050.05 0.060.06

아래 표 8은 KS F 4042 기준에 의한 보수용 모르타르의 습기투과성 시험에 대한 비교예와 실시예의 결과이다.Table 8 below shows the results of the comparative examples and the examples of the moisture permeability test of the repair mortar according to the KS F 4042 standard.

KS F 4042 기준Based on KS F 4042 실시예Example 비교예Comparative Example 습기 투과 저항성Moisture permeation resistance 2m 이하2m or less 1.41.4 1.51.5

아래 표 9는 KS F 4042 기준에 의한 보수용 모르타르의 염화물 이온 침투 저항성 시험에 대한 비교예와 실시예의 결과이다.Table 9 below shows the results of comparative examples and examples of chloride ion penetration resistance test of repair mortar according to KS F 4042 standard.

KS F 4042 기준Based on KS F 4042 실시예Example 비교예Comparative Example 염화물 이온 침투
저항성
Chloride ion penetration
Resistance
1000 이하1000 or less 649649 768768

아래 표 10은 KS F 4042 기준에 의한 보수용 모르타르의 길이 변화율 시험에 대한 비교예와 실시예의 결과이다.Table 10 below shows the results of the comparative example and the example of the length change rate test of the repair mortar according to KS F 4042 standard.

KS F 4042 기준Based on KS F 4042 실시예Example 비교예Comparative Example 길이 변화율Length change rate ±0.15 이내Within ± 0.15 -0.058-0.058 -0.0602-0.0602

아래 표 11은 KS F 4042 기준에 의한 보수용 모르타르의 중성화 저항성 시험에 대한 비교예와 실시예의 결과이다.Table 11 below shows the results of the comparative examples and the examples of the neutralization resistance test of the repair mortar according to the KS F 4042 standard.

KS F 4042 기준Based on KS F 4042 실시예Example 비교예Comparative Example 중성화 저항성Neutralization resistance 2mm 이하2 mm or less 1.51.5 1.61.6

표 1 내지 표 11과 같이 본 발명의 실시예가 비교예 보다 모든 항목의 시험에서 성능이 우수한 것으로 확인되었다.As shown in Tables 1 to 11, the examples of the present invention were found to have superior performance in the tests of all items than the comparative examples.

A : 조성물 1 : 몰드
2 : 건조장치 10 : 스틱
20 : 처리장치 100 : 콘크리트 구조물
101 : 균열 111 : 균열부
A: Composition 1: Mold
2: drying device 10: stick
20: processing apparatus 100: concrete structure
101: Crack 111: Crack part

Claims (12)

시멘트 47~56 중량%;
슬래그 15~23 중량%;
무수석고 2.5~4.5 중량%;
실리카퓸 4~20 중량%;
벤토나이트 2.5~4.5 중량%;
분말형 유동화제 0.1~0.3중량%;
물 8~10중량%;
알코올 3~5중량%;를 포함하는 조성물(A)로 제조된 콘크리트 표면 균열 보수용 스틱.
47 to 56% by weight of cement;
15 to 23% by weight of slag;
2.5 to 4.5 wt% of anhydrous gypsum;
4 to 20% by weight of silica fume;
2.5 to 4.5 wt% bentonite;
0.1 to 0.3% by weight of a powdery fluidizing agent;
8 to 10% by weight of water;
3 to 5% by weight of an alcohol; and (C) a concrete surface crack repairing stick made of the composition (A).
제1항에 있어서,
상기 슬래그는 동제련슬래그와 고로슬래그가 혼합된 것을 특징으로 하는 표면균열 보수용 스틱.
The method according to claim 1,
Wherein the slag is a mixture of copper smelting slag and blast furnace slag.
제1항에 있어서,
상기 실리카퓸은 고순도 규소철(Fe-si)의 생산과정에서 발생하는 부산물을 집진하여 반압축 상태로 압축한 것으로서, 부피비중이 500~650kg/㎥인 것을 특징으로 하는 콘크리트 표면 균열 보수용 스틱.
The method according to claim 1,
Wherein the silica fume has a volume specific gravity of 500 to 650 kg / m < 3 >, which is obtained by collecting byproducts generated during the production of high purity silicon iron (Fe-Si) and compressing it in a semi-compression state.
제3항에 있어서,
상기 실리카퓸은 비표면적이 13,000~17,000㎡/kg인 것을 특징으로 하는 콘크리트 표면 균열 보수용 스틱.
The method of claim 3,
Wherein the silica fume has a specific surface area of 13,000 to 17,000 m 2 / kg.
제1항에 있어서,
상기 벤토나이트는 Al2O3계 또는 SiO2계 중 어느 하나인 것을 특징으로 하는콘크리트 표면 균열 보수용 스틱.
The method according to claim 1,
Wherein the bentonite is one of Al 2 O 3 -based or SiO 2 -based concrete.
제1항 내지 제5항 중 어느 한 항의 콘크리트 표면 균열 보수용 스틱(10) 제조방법으로서,
상기 실리카퓸과 상기 물을 혼합하여 상기 실리카퓸을 슬러리화하는 실리카퓸슬러리화단계;
상기 시멘트, 상기 슬래그, 상기 무수석고, 상기 벤토나이트, 상기 분말형 유동화제, 상기 알코올, 상기 물을 슬러리화되어 있는 상기 실리카퓸과 혼합하여 상기 조성물(A)을 혼합하는 혼합단계;
상기 조성물(A)을 상기 콘크리트 표면 균열 보수용 스틱(10)의 제작용 몰드(1)에 투입하는 몰드투입단계;
초기 수화반응을 촉진함과 아울러, 상기 스틱(10) 내부의 수분을 증발시켜 완전 수화반응을 억제하도록 고온으로 상기 조성물(A)을 건조하는 고온경화단계;
상기 스틱(10) 내부의 잔여 수분을 완전히 경화시키기 위해 전자파를 이용하여 건조하는 전자파경화단계;를 포함하는 것을 특징으로 하는 균열 보수용 스틱 제조방법.
A method of manufacturing a concrete surface crack repairing stick (10) according to any one of claims 1 to 5,
A silica fume slurrying step of mixing the silica fume and the water to slurry the silica fume;
Mixing the composition (A) by mixing the cement, the slag, the anhydrous gypsum, the bentonite, the powdery fluidizing agent, the alcohol, and the water with the silica fume slurried;
A mold injecting step of injecting the composition (A) into a mold (1) for producing a concrete surface crack repairing concrete (10);
A high temperature curing step of accelerating the initial hydration reaction and drying the composition (A) at a high temperature so as to evaporate water in the stick 10 to suppress the hydration reaction;
And an electromagnetic wave curing step of drying using the electromagnetic wave to completely cure the residual moisture in the stick (10).
제6항에 있어서,
상기 고온경화단계는
상기 몰드(1)에 투입된 상기 조성물(A)을 100~110℃의 온도에서 2~3시간 동안 건조하는 것을 특징으로 하는 균열 보수용 스틱 제조방법.
The method according to claim 6,
The high temperature curing step
Wherein the composition (A) charged into the mold (1) is dried at a temperature of 100 to 110 ° C for 2 to 3 hours.
제6항에 있어서,
상기 전자파경화단계는
주파수가 2250~2650Mhz인 건조장치(2)에서 상기 고온경화단계 이후의 상기 조성물(A)을 건조하는 것을 특징으로 하는 균열 보수용 스틱 제조방법.
The method according to claim 6,
The electromagnetic wave hardening step
Wherein the composition (A) after the high temperature curing step is dried in a drying apparatus (2) having a frequency of 2250 to 2650 MHz.
제8항에 있어서,
상기 전자파경화단계는 0.5~5분간 건조하는 것을 특징으로 하는 균열 보수용 스틱 제조방법.
9. The method of claim 8,
Wherein the electromagnetic wave hardening step is performed for 0.5 to 5 minutes.
제6항에 있어서,
상기 실리카퓸슬러리화단계는
상기 실리카퓸 중량의 2~3배인 상기 물을 먼저 혼합하는 것을 특징으로 하는 균열 보수용 스틱 제조방법.
The method according to claim 6,
The silica fume slurrying step
Wherein the water having a weight of 2 to 3 times the weight of the silica fume is mixed first.
제6항의 제조방법으로 제작된 균열 보수용 스틱(10)을 이용한 콘크리트 표면 보수방법으로서,
균열(101)이 발생한 콘크리트 구조물(100)의 표면 균열부(111)를 정리하는 표면정리단계;
상기 균열부(111)의 표면에 물을 분사하여 상기 균열(101)에 물을 침투시키는 물분사단계;
상기 균열 보수용 스틱(10)을 상기 균열부(111)에 문질러 상기 균열 보수용 스틱(10) 가루가 상기 균열(101)의 내부로 침투시키는 스틱처리단계;
표면처리장치(20)를 이용하여 상기 스틱(10) 가루가 침투된 상기 균열(101)의 표면을 정리하는 표면처리단계;
상기 균열(101) 내부에 침투된 상기 물과 상기 스틱(10) 가루가 상호 접촉하여 경화되는 경화단계;를 포함하는 것을 특징으로 하는 콘크리트 표면 보수방법.
A concrete surface repair method using a crack repair stick (10) manufactured by the manufacturing method of claim 6,
A surface cleaning step of arranging the surface cracks 111 of the concrete structure 100 in which the cracks 101 are generated;
A water spraying step of spraying water onto the surface of the crack part (111) to infiltrate water into the crack (101);
A stick treating step of rubbing the crack repairing stick 10 against the cracking portion 111 to infiltrate the crack repairing stick 10 into the crack 101;
A surface treatment step of arranging a surface of the crack (101) into which the stick (10) has penetrated using the surface treatment apparatus (20);
And a curing step of curing the water permeated into the cracks (101) and the powder of the stick (10) in contact with each other.
제11항에 있어서,
상기 표면처리장치(20)는 손가락에 끼워지는 골무 타입으로 형성된 것을 특징으로 하는 콘크리트 표면 보수방법.
12. The method of claim 11,
Wherein the surface treatment apparatus (20) is formed as a thimble type to be fitted on a finger.
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KR102416220B1 (en) * 2021-02-01 2022-07-05 경기대학교 산학협력단 Preparing method of pill for healing concrete crack using cemetitious inorganic material
KR102416222B1 (en) * 2021-06-21 2022-07-06 경기대학교 산학협력단 High-absorbable fiber based pill for healing concrete crack having function of controlling crack width and preparing method the same

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KR102416221B1 (en) * 2021-02-01 2022-07-05 경기대학교 산학협력단 Preparing method of pill for healing concrete crack using bacterial material
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KR102416222B1 (en) * 2021-06-21 2022-07-06 경기대학교 산학협력단 High-absorbable fiber based pill for healing concrete crack having function of controlling crack width and preparing method the same

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