KR101774509B1 - Mortar Composition for Repairing Concrete Structure, and Repairing Method of Concrete Structure using such Mortar Composition - Google Patents
Mortar Composition for Repairing Concrete Structure, and Repairing Method of Concrete Structure using such Mortar Composition Download PDFInfo
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- KR101774509B1 KR101774509B1 KR1020160153971A KR20160153971A KR101774509B1 KR 101774509 B1 KR101774509 B1 KR 101774509B1 KR 1020160153971 A KR1020160153971 A KR 1020160153971A KR 20160153971 A KR20160153971 A KR 20160153971A KR 101774509 B1 KR101774509 B1 KR 101774509B1
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- concrete structure
- parts
- mortar composition
- calcium oxide
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- 239000000203 mixture Substances 0.000 title claims abstract description 57
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 23
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical class [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000004927 clay Substances 0.000 claims abstract description 19
- 230000002378 acidificating effect Effects 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000011230 binding agent Substances 0.000 claims abstract description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 27
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 19
- 239000000292 calcium oxide Substances 0.000 claims description 18
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 8
- -1 phosphate modified calcium oxide Chemical class 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 230000008439 repair process Effects 0.000 abstract description 11
- 238000005336 cracking Methods 0.000 abstract description 3
- 230000036314 physical performance Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 14
- 230000006866 deterioration Effects 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 239000007864 aqueous solution Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000011433 polymer cement mortar Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000001354 calcination Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000001506 calcium phosphate Substances 0.000 description 3
- 229910000389 calcium phosphate Inorganic materials 0.000 description 3
- 235000011010 calcium phosphates Nutrition 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 2
- 229910052808 lithium carbonate Inorganic materials 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001404 mediated effect Effects 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007589 penetration resistance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions 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 hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use 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
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/10—Clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/008—Cement and like inorganic materials added as expanding or shrinkage compensating ingredients in mortar or concrete compositions, the expansion being the result of a recrystallisation
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/346—Materials exhibiting reduced plastic shrinkage cracking
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Architecture (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
본 발명은 시멘트계 결합재 100중량부에 대하여 각각 인산 개질 산화칼슘계 팽창재 3 ~ 8중량부, 산성백토 0.2 ~ 2.0중량부 및 잔골재 50~300중량부로 포함하는 조성을 가지고 있어서, 열악한 환경하에서도 휨강도, 압축강도, 부착강도 등의 기본 물리 성능을 만족하면서 균열 발생을 효과적으로 억제할 수 있는 우수한 균열 저항성을 가지는 콘크리트 구조물 보수용 균열제어형 모르타르 조성물과, 이를 이용한 콘크리트 구조물의 보수방법에 관한 것이다.The present invention has a composition comprising 3 to 8 parts by weight of phosphoric acid-modified calcium oxide based expanding agent, 0.2 to 2.0 parts by weight of acidic white clay and 50 to 300 parts by weight of fine aggregate, based on 100 parts by weight of cementitious binder, The present invention relates to a crack control type mortar composition for repairing concrete structures having excellent crack resistance that can effectively suppress cracking while satisfying basic physical performances such as strength, adhesion strength, etc., and a repair method of a concrete structure using the same.
Description
본 발명은 콘크리트 구조물에 발생한 균열, 열화 등의 손상을 보수하고 복구하는데 이용되는 모르타르 조성물 및 이를 이용하여 콘크리트 구조물을 보수하는 방법에 대한 것으로서, 구체적으로는 열악한 환경하에서도 휨강도, 압축강도, 부착강도 등의 기본 물리 성능을 만족하면서 균열 발생을 효과적으로 억제할 수 있는 우수한 균열 저항성을 가지는 콘크리트 구조물 보수용 균열제어형 모르타르 조성물과, 이를 이용한 콘크리트 구조물의 보수방법에 관한 것이다.The present invention relates to a mortar composition used for repairing and repairing damages such as cracks and deterioration occurring in concrete structures, and a method of repairing concrete structures using the mortar composition. More specifically, the present invention relates to a mortar composition, The present invention relates to a crack control type mortar composition for repairing a concrete structure having excellent crack resistance which can effectively suppress cracking while satisfying the basic physical performance of a concrete structure and a repair method of a concrete structure using the same.
콘크리트 구조물은 재료 및 배합, 시공, 구조 및 하중, 환경조건 등의 자연적 또는 인위적인 작용에 의해 여러 가지 형태의 균열이 발생한다. 이러한 콘크리트 구조물의 균열은 콘크리트 구조물의 성능 저하를 유발하는데, 이는 콘크리트 구조물을 설계사용년수까지 사용하지 못하게 만드는 원인으로 작용한다.Various types of cracks occur in concrete structures due to the natural or anthropogenic action of materials, formulations, construction, structure and load, and environmental conditions. Cracks in these concrete structures cause deterioration in the performance of the concrete structure, which causes the concrete structure to become unusable until the design life.
또한 재료 및 배합, 시공, 구조 및 하중과 같은 인위적인 작용을 배제하여도 외기 조건이나 환경에 따라 시간이 지남에 따라 콘크리트가 열화하여 그 성능이 저하된다. 따라서 콘크리트 구조물은 항상 지속적인 유지관리 행위가 필요하며, 특히 재료나 시공 및 구조 등의 문제가 자연 환경적 요인과 복합적으로 작용할 경우 콘크리트 구조물의 유지관리 수요는 더욱 증가한다. Also, even if artificial actions such as materials, formulations, construction, structure and load are excluded, concrete deteriorates with time and its performance deteriorates depending on the ambient conditions or the environment. Therefore, concrete structures always need to maintain maintenance activities. In particular, when the problems of materials, construction, and structure are mixed with natural environmental factors, the demand for maintenance of concrete structures increases more.
콘크리트는 건축 토목 공사에서 광범위하게 사용되고 있지만 내구성이 부족하다는 점이 지속적으로 문제로 인식되고 있다. 내구성 문제 중의 하나로 부식, 탈락, 중성화, 강도저하 등의 콘크리트 열화(劣化)가 있는데, 콘크리트의 열화 원인 및 현상에 따라서는 다양한 물리 및 화학반응으로 인하여 콘크리트 열화가 빠르게 진행하기도 한다.Concrete is widely used in civil engineering work, but lack of durability is constantly being recognized as a problem. One of the problems of durability is the deterioration of concrete such as corrosion, dropout, neutralization and strength decrease. Depending on the cause and the phenomenon of the deterioration of the concrete, the deterioration of concrete due to various physical and chemical reactions may proceed rapidly.
콘크리트 구조물의 사용 연수를 증가시키기 위해서는 인위적인 결함을 최소화해야 하지만 자연환경에 의한 열화 요인에 적극적으로 대처할 필요가 있다. 콘크리트 구조물을 열화시키는 자연적인 요인은, 콘크리트 외부의 온도변화나 대기, 토양의 습기를 매개로 하는 이산화탄소, 염소 이온, 황산 이온, 산성 이온 등과 같은 "열화인자의 침투"이다. 이러한 열화인자의 침투로 인하여 콘크리트에 열화가 발생할 경우, 열화부위를 제거한 후 제거된 콘크리트 구조물의 단면을 복구하는 방법 즉, "콘크리트 구조물의 단면보수 공법"이 많이 이용된다. 콘크리트 구조물의 단면보수 공법에는 주로 "보수용 모르타르"가 이용되는데, 보수용 모르타르는 콘크리트 모체의 지속적인 열화를 방지하기 위하여 수분이나 유해 이온 등의 열화인자가 콘크리트 내부로 침투하는 것을 억제하는 것을 가장 중요한 기능 중의 하나로서 가지고 있어야 한다. In order to increase the service life of concrete structures, artificial defects must be minimized, but it is necessary to actively cope with deterioration factors caused by the natural environment. Natural factors that deteriorate concrete structures are "penetration of degradation factors" such as carbon dioxide, chlorine ions, sulfate ions, and acid ions mediated by temperature changes outside the concrete, the atmosphere, and soil moisture. In case of deterioration of concrete due to penetration of such deteriorating factor, a method of repairing the section of the removed concrete structure after removing the deteriorated part, that is, the "section repair method of concrete structure" is often used. Mainly, "repair mortar" is used for maintenance of concrete structure. In order to prevent continuous deterioration of concrete matrix, repair mortar is most important to prevent deterioration factors such as moisture and harmful ions from penetrating into concrete It should be one of the functions.
종래 기술로서 외부 이온과 쉽게 반응하는 수산화칼슘 생성물을 억제하도록 시멘트 사용량을 줄인 폴리머 시멘트 모르타르를 보수용으로 이용하는 방안이 제시되어 있다. 이러한 종래 기술의 일예가 대한민국 등록특허공보 제10-0846159호에 개시되어 있다. 그런데 이러한 폴리머 시멘트 모르타르의 경우, 내화학성이 향상되지만 중성화, 동결융해 등의 저하 등 문제점이 발생할 가능성이 크다. As a prior art, there has been proposed a method of using polymer cement mortar, which reduces the amount of cement used to repair the calcium hydroxide product, which easily reacts with external ions, for maintenance. One example of such a conventional technique is disclosed in Korean Patent Registration No. 10-0846159. However, in the case of such a polymer-cement mortar, the chemical resistance is improved but problems such as neutralization, freezing and thawing, etc. are likely to occur.
또다른 종래 기술로서 보수용 모르타르에 균열저감재를 혼입하여 사용함으로써 수축량을 저감하여 균열을 감소시키는 방안이 제시되고 있지만, 이러한 종래 기술의 경우 고온양생 환경이나 습도가 낮은 환경, 바람이 부는 환경 등의 열악한 환경에서는 표면에서의 수분이 급격하게 날아가면서 강도가 크게 저하되고 균열저항성이 낮아서 실질적으로는 균열저감재로서의 제기능을 발휘하지 못하는 문제점을 가지고 있다. As another conventional technique, there has been proposed a method of reducing cracks by reducing the amount of shrinkage by mixing a crack-reducing material into a repair mortar. However, in the case of such a conventional technique, a high temperature curing environment, a low humidity environment, There is a problem in that the moisture is suddenly blown on the surface and the strength is greatly lowered and the crack resistance is low so that the function as a crack reducing material can not be exhibited substantially.
본 발명은 콘크리트 구조물을 보수함에 있어서 종래의 모르타르 조성물에서의 균열 발생 등의 문제점을 해결하기 위하여 개발된 것으로서, 구체적으로 균열 발생이 발생하기 쉬운 습도가 낮은 환경에서 휨강도, 압축강도, 부착강도 등의 기본 물리 성능을 만족하면서 균열 저항성을 향상시킨 콘크리트 구조물 보수용 균열제어형 모르타르 조성물과, 이러한 모르타르 조성물을 이용하여 콘크리트 구조물을 보수하는 공법을 제공하는 것을 목적으로 한다. The present invention has been developed in order to solve problems such as occurrence of cracks in a conventional mortar composition in repairing a concrete structure. Specifically, the present invention relates to a method for repairing cracks in a mortar composition such as flexural strength, compressive strength, A crack control type mortar composition for repairing a concrete structure having improved crack resistance while satisfying basic physical performance and a method for repairing a concrete structure using such a mortar composition.
상기한 과제를 달성하기 위하여 본 발명에서는, 시멘트계 결합재, 인산 개질 산화칼슘계 팽창재, 산성백토 및 잔골재를 포함하는 콘크리트 구조물 보수용 모르타르 조성물로서, 시멘트계 결합재 100중량부에 대하여 각각 인산 개질 산화칼슘계 팽창재 3 ~ 8중량부, 산성백토 0.2 ~ 2.0중량부 및 잔골재 50~300중량부로 포함하는 것을 특징으로 하는 콘크리트 구조물 보수용 균열제어형 모르타르 조성물이 제공된다. In order to achieve the above object, the present invention provides a mortar composition for repairing a concrete structure comprising a cement based binder, a phosphoric acid modified calcium oxide based expandable material, an acidic white clay and a fine aggregate, wherein the phosphate modified calcium oxide based expandable material 3 to 8 parts by weight, acidic clay in an amount of 0.2 to 2.0 parts by weight, and fine aggregate in an amount of 50 to 300 parts by weight based on the total weight of the mortar composition.
이러한 본 발명의 모르타르 조성물에 있어서, 인산 개질 산화칼슘계 팽창재는, 시멘트계 결합재 100중량부에 대하여 4 ~ 6중량부로 포함되며; 산성백토는 0.5 ~ 1.5중량부로 포함될 수 있다. In the mortar composition of the present invention, the phosphoric acid-modified calcium oxide-based expandable material is contained in an amount of 4 to 6 parts by weight based on 100 parts by weight of the cementitious binder; The acidic clay may be included in an amount of 0.5 to 1.5 parts by weight.
또한 본 발명의 모르타르 조성물에 있어서, 인산 개질 산화칼슘계 팽창재는, 섭씨 900 ~ 1,100도의 온도에서 산화칼슘 클링커를 소성하여 분쇄한 분말에, 인산수용액을 분무하면서 혼련하여 제조된 것일 수 있으며, 산성백토는 2,500∼4,000cm2/g의 비표면적을 가지는 것일 수 있다. In the mortar composition of the present invention, the phosphoric acid-modified calcium oxide-based expansion material may be one produced by firing a pulverized powder of calcium oxide clinker at a temperature of 900 to 1,100 degrees Celsius while spraying an aqueous phosphoric acid solution, May have a specific surface area of 2,500 to 4,000 cm 2 / g.
더 나아가 본 발명에서는 상기한 과제를 달성하기 위하여, 콘크리트 구조물을 보수하는 방법으로서, 콘크리트 구조물의 열화부를 제거하고; 열화부가 제거된 부분에 상기한 본 발명에 따른 모르타르 조성물을 충진하는 것을 특징으로 하는 콘크리트 구조물의 보수방법이 제공된다. Further, in order to accomplish the above object, the present invention provides a method of repairing a concrete structure, comprising: removing a deteriorated portion of a concrete structure; There is provided a method of repairing a concrete structure characterized by filling the mortar composition according to the present invention with a portion from which the deteriorated portion has been removed.
본 발명에 따른 보수방법에서 모르타르 조성물을 충진하기 전에, 콘크리트 구조물에서 열화부가 제거된 부분에 콘크리트 성능회복제 및 프라이머를 도포할 수도 있다.In the repair method according to the present invention, the concrete performance restorer and the primer may be applied to the portion where the deteriorated portion is removed from the concrete structure before filling the mortar composition.
본 발명에 따른 모르타르 조성물은 콘크리트 구조물의 열화된 부분에 보수용으로 사용하였을 때, 보수된 부분에서 건조수축을 효과적으로 저감시켜 건조수축에 의한 균열 발생 요인을 저감시켜 균열 발생에 따른 내구성 저하 현상을 방지하는 효과를 발휘한다. 특히 균열이 발생하기 쉬운 습도가 낮은 환경에서 이러한 유리한 효과가 더욱더 기대된다. The mortar composition according to the present invention effectively reduces the drying shrinkage in the repair part when the deteriorated part of the concrete structure is used for repairing, thereby reducing the occurrence of crack due to drying shrinkage and preventing the durability deterioration due to cracking . This advantageous effect is particularly expected in an environment where cracks tend to occur and humidity is low.
또한 본 발명에 따른 모르타르 조성물은 습도가 낮은 환경에서도 일정부분 수분을 공급하는 작용을 하여 지속적인 강도증진에도 큰 효과를 발휘하게 되는 장점을 가진다. In addition, the mortar composition according to the present invention has an advantage that it exerts a large effect on continuous strength enhancement since it acts to supply a certain amount of moisture even in a low humidity environment.
이하, 본 발명의 바람직한 실시예들을 상세히 설명한다. 본 발명을 설명함에 있어서, 본문에 개시되어 있는 본 발명의 실시예들은 단지 설명을 위한 목적으로 예시된 것으로서, 본 발명의 실시예들은 다양한 형태로 실시될 수 있으며 본문에 설명된 실시예들에 한정되는 것으로 해석되어서는 안 된다. 또한 본 발명은 다양한 변경을 가할 수 있고 여러 가지 형태를 가질 수 있는 바, 실시예들은 본 발명을 특정한 개시 형태로 한정하려는 것이 아니며, 본 발명의 사상 및 기술 범위에 포함되는 모든 변경, 균등물 내지 대체물을 포함하는 것으로 이해되어야 할 것이다. 특히, 본 명세서에서는 본 발명에 따른 콘크리트 구조물 보수용(補修用) 균열제어형(龜裂制御形) 모르타르 조성물을 "본 발명의 모르타르 조성물 또는 본 발명에 따른 모르타르 조성물"이라고 약칭한다. Hereinafter, preferred embodiments of the present invention will be described in detail. In describing the present invention, it is to be understood that the embodiments of the present invention disclosed herein are for illustrative purposes only and that embodiments of the present invention may be embodied in various forms and are not limited to the embodiments described herein Should not be construed as being. It is to be understood that the present invention is not limited to the particular forms disclosed, and that various changes, substitutions, and equivalents may be made therein without departing from the spirit and scope of the invention. Alternate < / RTI > Particularly, in the present specification, a crack control type mortar composition for repairing a concrete structure according to the present invention is abbreviated as "the mortar composition of the present invention or the mortar composition according to the present invention ".
콘크리트 구조물 보수용 균열제어형 모르타르 조성물 및 이를 이용한 보수방법Crack-controlled mortar composition for repairing concrete structures and repair method using the same
본 발명에 따른 모르타르 조성물은, 인산 개질 산화칼슘계 팽창재 및 산성 백토를 포함한다. 구체적으로 본 발명의 모르타르 조성물은, 시멘트계 결합재, 인산 개질 산화칼슘계 팽창재, 산성백토 및 잔골재를 포함하는데, 시멘트계 결합재 100중량부에 대하여, 각각 인산 개질 산화칼슘계 팽창재는 3~8중량부로, 산성 백토 0.2~2.0중량부로, 그리고 잔골재 50~300중량부로 포함한다. The mortar composition according to the present invention comprises a phosphate-modified calcium oxide-based expander and an acidic clay. Specifically, the mortar composition of the present invention comprises a cement based binder, a phosphoric acid modified calcium oxide based expandable material, an acidic white clay and a fine aggregate, wherein the phosphoric acid modified calcium oxide based expandable material is 3 to 8 parts by weight, 0.2 to 2.0 parts by weight of clay and 50 to 300 parts by weight of fine aggregate.
본 발명에서 인산 개질 산화칼슘계 팽창재는, 산화칼슘(CaO)계 팽창재를 개량한 것으로서, 특히, 섭씨 900 ~ 1,100도의 온도에서 산화칼슘 클링커를 소성하여 분쇄한 후 인산수용액으로 표면 처리한 것이다. 일반적으로 산화칼슘은 수화 반응에 의하여 수산화칼슘을 생성하면서 체적이 팽창하는 현상이 일어나므로, 시멘트 경화체가 구조적으로 안정화되는 시기에 팽창하여 수축을 저감하는 팽창재로서 주로 사용된다. 그러나 일반적으로 산화칼슘은 물과 급속히 반응하기 때문에 반응속도의 조절 없이는 팽창재로서 유용하게 사용할 수 없을 뿐만 아니라 시멘트계 모르타르나 콘크리트의 작업성 등에 악영향을 미치기 때문에 산화칼슘을 팽창재로 활용하기 위해서, 종래에는 산화칼슘을 섭씨 1,300도 이상의 온도에서 과소(dead-burn)하여 수화반응성을 지연시키는 방식을 이용하였다. 종래 기술에 의해 섭씨 1,300도 이상에서 과소한 산화칼슘계 팽창재는, 기존의 칼슘설포알루미네이트계(CSA계) 팽창재에 비하여 양생온도 및 습도에 의한 영향이 작다는 장점이 있으나, 초기 반응성을 완벽히 제어하는데는 한계가 있으며, 고난이도의 소성기술이 필요하기 때문에 비용이 비싸다는 단점을 가지고 있다. In the present invention, the phosphate-modified calcium oxide-based expandable material is an improvement of a calcium oxide (CaO) -based expanding material. Specifically, the calcium oxide clinker is calcined at a temperature of 900 to 1,100 degrees centigrade and then ground and then treated with an aqueous phosphoric acid solution. Generally, calcium oxide is used as an expanding material which shrinks and shrinks at a time when the cement hardened material is structurally stabilized, because a volume expansion occurs while generating calcium hydroxide by hydration reaction. However, since calcium oxide generally reacts rapidly with water, it can not be effectively used as an expansion agent without controlling the reaction rate, and adversely affects the workability of cement mortar or concrete. Therefore, in order to utilize calcium oxide as an expansion agent, Calcium was dead-burned at a temperature of 1,300 degrees Celsius or more to retard hydration reactivity. The calcium oxide-based expanding material which is over-heated at a temperature of 1,300 ° C. or more by the prior art has an advantage of being less affected by the curing temperature and humidity as compared with the existing calcium sulfoaluminate-based (CSA-based) expanding material, And there is a disadvantage in that it is expensive because of the need for sophisticated firing technology.
본 발명에서는 위와 같은 종래 기술의 문제점을 해결하기 위하여, 산화칼슘의 소성온도를 종래 기술보다 낮은 온도인 섭씨 900 ~ 1,100도의 범위에서, 더 바람직하게는 섭씨 1,050 ~ 1,100도의 범위로 하여 인산 개질 산화칼슘계 팽창재를 제조하였다. In the present invention, in order to solve the problems of the conventional art as described above, the calcination temperature of calcium oxide is set to be in the range of 900 to 1,100 deg. C, more preferably in the range of 1,050 to 1,100 deg. Based expander.
산화칼슘을 섭씨 900도 미만에서 소성 시에는 반응이 매우 급격히 일어나서 후속하는 공정인 인산수용액에 의한 표면처리로 반응시기를 제어하는데 어려움이 수반되는 문제가 발생한다. 따라서 본 발명의 인산 개질 산화칼슘계 팽창재를 제조함에 있어서, 산화칼슘의 소성 온도는 섭씨 900도 이상으로 한다. When the calcium oxide is calcined at a temperature of less than 900 deg. C, the reaction occurs very rapidly and there arises a problem that it is difficult to control the reaction time by surface treatment with a phosphoric acid aqueous solution as a subsequent process. Therefore, in producing the phosphate-modified calcium oxide based expandable material of the present invention, the calcination temperature of the calcium oxide is set to 900 DEG C or more.
본 발명에는 단순히 소성 과정만 거친 산화칼슘을 팽창재로 사용하는 것이 아니라, 위와 같이 소성 과정을 거친 산화칼슘을 인산수용액으로 표면처리하여 팽창재로 사용한다. In the present invention, calcium oxide subjected to a calcination process is surface-treated with an aqueous phosphoric acid solution and used as an expanding agent, rather than simply using calcined calcium oxide as an expanding agent.
구체적으로 인산의 퍼센트 농도가 50%이상인 인산수용액을, 소성 후 분쇄된 산화칼슘 분말에 무중력 믹서 등에서 분무하면서 혼련하는 공정을 수행함으로써, 소성 과정을 거친 산화칼슘을 인산수용액으로 표면처리한 <인산 개질 산화칼슘계 팽창재>를 얻을 수 있게 된다. Specifically, a step of spraying an aqueous phosphoric acid solution having a percent concentration of phosphoric acid of 50% or more to the pulverized calcium oxide powder after sintering by spraying it in a non-gravity mixer or the like is carried out, whereby calcium oxide subjected to the calcination process is subjected to surface treatment with a phosphoric acid aqueous solution A calcium oxide-based expansion material can be obtained.
인산수용액을 소성된 산화칼슘 분말에 분무하게 되면, 인산수용액이 소성된 산화칼슘의 표면에서 순간적으로 반응하여 인산칼슘(CaHPO4ㅇ xH2O, x=1.5 or 2.0 or 4.75)층을 생성하게 되는데, 상기 인산칼슘 반응층은 물과 교반하는 초기 시기에는 녹아나지 않으며, 응결 이후에 pH가 강알칼리 환경이 되면서 서서히 녹는 특성을 가지고 있으므로, 초기 작업성에 기여하고 경화하면서 팽창반응을 제어하는데 기여한다. When the phosphoric acid aqueous solution is sprayed onto the calcined calcium oxide powder, the phosphoric acid aqueous solution instantaneously reacts on the surface of the calcined calcium oxide to generate calcium phosphate (CaHPO 4 .xH 2 O, x = 1.5 or 2.0 or 4.75) layer , The calcium phosphate reaction layer does not dissolve in the initial stage of stirring with water and gradually melts as the pH becomes a strong alkaline environment after the condensation, contributing to the initial workability and contributing to controlling the expansion reaction while hardening.
본 발명에 따른 모르타르 조성물은, 위와 같은 과정에 의해 제조된 인산 개질 산화칼슘계 팽창재를, 시멘트계 결합재 100중량부에 대하여 인산 개질 산화칼슘계 팽창재 3 ~ 8중량부로 포함한다. 인산 개질 산화칼슘계 팽창재의 혼입량은 팽창량을 결정하는 데 있어서 중요하다. 만일 본 발명의 모르타르 조성물에서 인산 개질 산화칼슘계 팽창재가 3중량부 미만으로 포함되는 경우, 보수용 모르타르 조성물에서 요구하는 팽창재로서의 효과가 미미하고, 8중량부를 초과하는 경우, 과팽창에 의하여 팽창균열을 일으킬 수 있다. 따라서 본 발명의 모르타르 조성물에서, 인산 개질 산화칼슘계 팽창재는 시멘트계 결합재 100중량부에 대해 3 ~ 8중량부로 포함되며, 가장 바람직하게는 4 ~ 6중량부로 포함된다. The mortar composition according to the present invention comprises 3 to 8 parts by weight of a phosphoric acid-modified calcium oxide-based expandable material, which is prepared by the above-described process, with respect to 100 parts by weight of a cementitious binding material. The amount of phosphoric acid-modified calcium oxide-based expansion agent mixed is important in determining the swelling amount. If the mortar composition of the present invention contains less than 3 parts by weight of the phosphoric acid-modified calcium oxide based expanding agent, the effect as an expanding agent required in the repairing mortar composition is insignificant. When the amount exceeds 8 parts by weight, ≪ / RTI > Accordingly, in the mortar composition of the present invention, the phosphoric acid-modified calcium oxide based expandable material is included in 3 to 8 parts by weight, and most preferably 4 to 6 parts by weight, based on 100 parts by weight of the cementitious binder.
한편, 본 발명의 모르타르 조성물은, 인산개질 산화칼슘계 팽창재와 함께, 산성백토를 시멘트 결합재 100중량부에 대하여 0.2 ~ 2.0중량부로 포함한다. On the other hand, the mortar composition of the present invention comprises, in addition to the phosphoric acid-modified calcium oxide-based expansion agent, 0.2 to 2.0 parts by weight of acidic clay based on 100 parts by weight of the cement binder.
산성백토는 침상 광물을 포함하는 점토광물로서, 외관상 벤토나이트와 거의 흡사하지만 벤토나이트보다 흡착력이 강하여 산성을 띄고 있으며 일반적으로 마그네시아 함량이 높고, 타설 초기에 산성을 띄어 작업성이 확보가 가능하고 응결 후에는 수분을 다량 흡착하면서 시멘트 경화체 내부에 보습력을 극대화하여 지속적인 강도 발현에 기여함은 물론 인산개질 산화칼슘계 팽창재의 안정적인 팽창반응에 기여한다. 특히 산성백토는 양생 습도가 낮은 환경에서도 내부에서 수분을 흡착하면서 체적안정성을 확보하는데 기여한다. Acid clay is a clay mineral containing needle-shaped minerals. It is similar in appearance to bentonite but has stronger adsorption power than bentonite. It is acidic and generally has high content of magnesia and acidity at the beginning of casting to ensure workability. After coagulation It maximizes the moisture retention within the hardened cement body while absorbing a large amount of water, thereby contributing to the stable expansion of the phosphoric acid-modified calcium oxide-based expansion agent. In particular, acid clay contributes to securing volumetric stability while adsorbing moisture from inside even in a low humidity curing environment.
본 발명에 따른 모르타르 조성물에서, 산성백토는 시멘트계 결합재 100중량부에 대하여 0.2 ~ 2.0중량부로 포함된다. 만일 산성백토의 함유량이 0.2중량부 미만에서는 보습효과가 미미하다는 문제점이 있으며, 산성백토의 함유량이 2.0중량부를 초과하면 작업 초기에 물을 많이 흡수하여 작업성이 떨어지고 강도 발현에도 악영향을 미치는 문제가 있다. 본 발명에서 산성백토는 2,500∼4,000cm2/g의 비표면적을 가지는 것으로서 시멘트계 결합재 100중량부에 대하여 0.5 ~ 1.5중량부, 더 나아가 0.8 ~ 1.4중량부로 포함하는 것이 매우 우수한 보습효과를 발휘한다는 측면에서 바람직하다. In the mortar composition according to the present invention, the acidic clay is contained in an amount of 0.2 to 2.0 parts by weight based on 100 parts by weight of the cementitious binder. If the content of the acidic clay is less than 0.2 parts by weight, there is a problem that the moisturizing effect is insufficient. If the content of the acidic clay is more than 2.0 parts by weight, the water is absorbed in the early stage of the operation to deteriorate the workability and adversely affect the strength development have. In the present invention, the acidic clay has a specific surface area of 2,500 to 4,000 cm 2 / g and is contained in an amount of 0.5 to 1.5 parts by weight, more preferably 0.8 to 1.4 parts by weight, based on 100 parts by weight of the cementitious binder, .
본 발명의 모르타르 조성물에서, 잔골재는 시멘트계 결합재 100중량부에 대해 50 ∼ 300중량부로 포함된다. 위에서 설명한 특징을 가지는 인산개질 산화칼슘계 팽창재, 산성백토, 시멘트계 결합재 및 잔골재를 포함하는 본 발명의 모르타르 조성물에는, 필요에 따라서 모르타르 조성물의 물리적 특성 개선을 위하여 일반적으로 사용되는 고로슬래그 미분말, 플라이애시, 실리카흄, 메타카올린 등의 혼화재료 뿐만 아니라, 증점제, 지연제, 촉진제, 유동화제, 소포제 등의 화학첨가제, 재유화형 분말수지 등이 더 포함될 수도 있다. In the mortar composition of the present invention, the fine aggregate is contained in an amount of 50 to 300 parts by weight based on 100 parts by weight of the cement based binder. The mortar composition of the present invention comprising the phosphoric acid-modified calcium oxide-based expandable material, the acidic white clay, the cementitious binder and the fine aggregate having the above-described characteristics may contain, if necessary, fine powder of blast furnace slag, fly ash , Silica fume, and meta kaolin, as well as chemical additives such as thickening agents, retarders, accelerators, fluidizers, defoamers, and re-oiling powder resins.
위와 같은 본 발명의 모르타르 조성물은 강도, 체적안정성 등에서 우수한 성능을 발휘하기 때문에 콘크리트 구조물에 발생한 균열, 열화 등의 손상을 보수하고 복구하는데 매우 유리하게 이용할 수 있다. Since the mortar composition of the present invention exhibits excellent performance in terms of strength and volume stability, the mortar composition of the present invention can be advantageously used for repairing and repairing damages such as cracks and deterioration occurring in concrete structures.
본 발명에 따른 콘크리트 구조물의 보수방법에서는, 상기한 본 발명의 모르타르 조성물을 이용하는데, 구체적으로 콘크리트 구조물의 열화부를 제거한 후, 열화부가 제거된 부분에 본 발명의 모르타르 조성물을 충진하게 된다. 이와 같은 본 발명에 따른 보수방법에 의해, 모르타르 조성물을 충진하여 콘크리트 구조물을 복원하는 경우, 모르타르 조성물이 충진된 부분은 물론이고, 콘크리트 구조물의 모체 또한 내구성이 향상되는 효과가 발휘된다. 본 발명의 모르타르 조성물을 충진하기 전에, 콘크리트 구조물에서 열화부가 제거된 부분의 표면에 콘크리트 성능회복제 및 프라이머를 도포하는 것도 바람직하다. 이는 모르타르 조성물과 콘크리트 구조물 간의 부착성능을 향상시키고, 콘크리트 구조물의 모체 성능을 조속히 회복시키기 위함이다. 이 때, 콘크리트 성능회복제로는, 콘크리트의 알칼리 회복제를 사용할 수 있으며, 프라이머로는 아크릴계 프라이머 또는 EVA계 프라이머를 사용하는 것이 바람직하다. In the concrete structure repairing method according to the present invention, the mortar composition of the present invention is used. Specifically, after the deteriorated portion of the concrete structure is removed, the mortar composition of the present invention is filled in the portion where the deteriorated portion is removed. According to the repair method of the present invention, when the concrete structure is restored by filling the mortar composition, not only the portion filled with the mortar composition, but also the durability of the matrix of the concrete structure is improved. It is also preferable to apply the concrete performance remover and the primer to the surface of the portion where the deteriorated portion is removed from the concrete structure before filling the mortar composition of the present invention. This is to improve the adhesion performance between the mortar composition and the concrete structure and to quickly recover the matrix performance of the concrete structure. At this time, an alkali recovery agent for concrete may be used as the concrete performance recovery agent, and it is preferable to use an acrylic primer or an EVA-based primer as the primer.
본 발명의 실시예 및 비교예EXAMPLES OF THE INVENTION AND COMPARATIVE EXAMPLES
본 발명에 따른 모르타르 조성물의 실시예를 제조하고, 이와 대비되는 비교예를 제조하여, 그 성능을 비교하였다. Examples of the mortar composition according to the present invention were prepared, comparative examples were prepared, and the performance was compared.
본 발명에 따른 모르타르 조성물의 실시예를 제조함에 있어서, 인산 개질 산화칼슘계 팽창재는 공업용 탄산칼슘을 섭씨 1,050도에서 소성한 후, 대기 중에서 냉각시켜서 볼밀로 3,200 Blaine가 되도록 미분쇄한 다음 무중력믹서에 넣고 농도 60%의 인산수용액을 미분쇄된 분말에 분무하여 인산개질 산화칼슘계 팽창재를 제조하였다. 이때 인산수용액은, 미분쇄된 분말의 중량을 100중량부라고 하였을 때 1중량부가 되는 양으로 분무하였다. In the preparation of the mortar composition according to the present invention, the calcium phosphate expanded calcium carbonate material for industrial use is calcined at 1,050 degrees Celsius for industrial use, then cooled in air and finely pulverized to 3,200 Blaine by a ball mill, And a phosphoric acid aqueous solution having a concentration of 60% was sprayed on the pulverized powder to prepare a phosphoric acid-modified calcium oxide-based expandable material. At this time, the aqueous phosphoric acid solution was sprayed in an amount of 1 part by weight when the weight of the pulverized powder was 100 parts by weight.
본 발명에 따른 모르타르 조성물의 실시예를 제조함에 있어서, 산성백토는 비표면적이 3,300cm2/g이고 수용액에서의 pH가 5.5인 제품을 사용하였다. In the preparation of the mortar composition according to the present invention, the acidic clay has a specific surface area of 3,300 cm 2 / g and a pH of 5.5 in the aqueous solution.
시멘트계 결합재로는 KS L 5201 규격에 부합되는 1종 포틀랜드 시멘트를 사용하였다. 잔골재로는 인조규사를 이용하였는데, 전체 잔골재의 100중량부에 대해 5호 인조규사가 50중량부로 포함되고 6호 인조규사가 나머지 50중량부로 포함된 것을 사용하였다. 아울러 KS F 2563 규격에 부합되는 고로슬래그 미분말과, 분말 수지로서 재유화형 에틸렌초산비닐수지계의 분말수지를 사용하였다.As a cementitious binder, one type of Portland cement conforming to KS L 5201 was used. As the fine aggregate, artificial silica sand was used, in which 50 parts by weight of No. 5 synthetic silica sand was contained and 100 parts by weight of No. 6 synthetic silica sand was contained in an amount of 50 parts by weight based on 100 parts by weight of the total fine aggregate. In addition, a blast furnace slag fine powder conforming to the KS F 2563 standard and a re-melting type ethylene-vinyl acetate resin powder resin were used as the powdery resin.
첨가제로는, 멜라민계 유동화제, 실리콘계 소포제, 스타치계 증점제, 탄산리튬계 촉진제 및 주석산계 지연제의 혼합물을 사용하였는데, 첨가제 100중량%에 대해 멜라민계 유동화제 68.5중량%, 실리콘계 소포제3.0중량%, 스타치계 증점제1.5중량%, 탄산리튬계 촉진제13.5중량%, 및 주석산계 지연제13.5중량%로 이루어진 것을 사용하였다. 비교예의 조성물을 위해서는, 폴리머시멘트 모르타르 및 CaO계 팽창재를 사용하였다. 실시예와 비교예의 구체적인 조성은 아래의 표 1과 같다. As the additives, a mixture of a melamine-based fluidizing agent, a silicone-based defoaming agent, a starch-based thickening agent, a lithium carbonate-based promoter and a tin-based retarder was used. 1.5 weight% starch thickener, 13.5 weight% lithium carbonate accelerator, and 13.5 weight% tin-based retarder. For the compositions of the comparative examples, polymeric cement mortar and CaO-based expanding agent were used. Specific compositions of Examples and Comparative Examples are shown in Table 1 below.
실시예의 조성물 및 비교예의 조성물 각각을 1,000mm × 300mm × 15mm 의 크기를 가지는 시편으로서 규산칼슘판 위에서 미장하여 제작하고, 습도 양생하에서의 효과를 확인하기 위하여 실시예 및 비교예의 모든 시험체는 상대습도 60%, 온도 섭씨 20도의 항온항습실에서 양생하였다. Each of the compositions of the examples and comparative examples was prepared by plastering on a calcium silicate plate as a specimen having a size of 1,000 mm x 300 mm x 15 mm and all the specimens of the examples and comparative examples were subjected to a heat treatment at a relative humidity of 60% , And cured in a temperature and humidity chamber at a temperature of 20 ° C.
양생이 완료된 시험체에 대해, 균열 발생을 최대로 하기 위하여 상대습도 45%, 온도 섭씨 25도의 대류식 항온항습 챔버에서 28일간 양생한 후, 표면에 발생한 0.1mm이상의 균열 길이를 측정하였다. 비교예1에 해당하는 폴리머 시멘트 모르타르의 특성은 KS F 2476 폴리머 시멘트 모르타르의 시험방법 및 KS F 4042 콘크리트 구조물 보수용 폴리머 시멘트 모르타르의 시험방법으로 확인하였다. 위 표 1의 배합에 의해 제조된 본 발명의 실시예와, 이에 대비되는 비교예에 대해, 주요 물리적 성능으로서 휨강도, 압축강도, 부착강도 및 길이변화를 측정하였으며, 내구성능을 확인하기 위하여 염화물 침투저항성을 측정하였다. The cured samples were cured in a convection-type constant temperature and humidity chamber having a relative humidity of 45% and a temperature of 25 ° C for 28 days in order to maximize the occurrence of cracks. The properties of the polymer cement mortar corresponding to Comparative Example 1 were confirmed by the test method of KS F 2476 polymer cement mortar and the test method of polymer cement mortar for repairing KS F 4042 concrete structure. Bending strength, compressive strength, adhesion strength and length change were measured as major physical properties of the examples of the present invention prepared by the blending of the above Table 1 and comparative examples, and chloride penetration The resistance was measured.
다음의 표 2에는 실시예와 비교예에 대한 실험 측정 결과가 정리되어 있다. The following Table 2 summarizes the experimental measurement results for the Examples and Comparative Examples.
표 2와 같이, 본 발명의 실시예에 있어서, 초기 재령인 3일에서 압축강도, 휨강도 및 부착강도는 비교예와 유사하지만 내부 양생의 효과에 의하여 7일 및 28일의 장기재령에서는 압축강도, 휨강도 및 부착강도 모두 지속적으로 비교예에 비하여 우수한 것으로 확인되었으며, 길이변화 시험결과에서도 상대습도 40%에서는 비교예의 수축율이 본 발명의 실시예에 비하여 3배 이상 큰 것으로 확인되었다. 즉, 본 발명의 모르타르 조성물은, 우수한 압축강도, 휨강도 및 부착강도를 발휘하되 이러한 강도 발휘가 장기 재령에서도 지속적으로 이루어지고 있음을 알 수 있으며, 건조수축은 크게 작음을 확인할 수 있다. As shown in Table 2, the compressive strength, the flexural strength and the adhesive strength at the initial age of 3 days were similar to those of the comparative example, but at the early age of 7 days and 28 days, Both the bending strength and the bond strength were consistently superior to those of the comparative example. Also, in the result of the length change test, it was confirmed that the shrinkage ratio of the comparative example was three times greater than that of the embodiment of the present invention at the relative humidity of 40%. That is, the mortar composition of the present invention exhibits excellent compressive strength, bending strength and adhesion strength, but it can be seen that such strength is continuously exhibited even in the long-term age, and the drying shrinkage is largely small.
또한 염화물 이온 침투저항성 시험결과에서도 본 발명의 실시예는 비교예에 비하여 염화물 이온의 침투 저항성이 큰 것으로 확인되었다. Also, as a result of the chloride ion penetration resistance test, it was confirmed that the embodiment of the present invention has a greater chloride ion penetration resistance than the comparative example.
특히 균열의 육안관찰 시험결과에서도 수축에 의한 균열 발생에 있어서도, 본 발명의 실시예가 비교예에 비하여 균열이 현저하게 적게 발생됨을 확인할 수 있었다. In particular, it was confirmed from the visual observation test results of the cracks that the cracks due to the shrinkage occurred in the examples of the present invention, as compared with the comparative examples.
이와 같은 본 발명에 따른 모르타르 조성물의 유리한 특성은, 본 발명의 모르타르 조성물을 콘크리트 구조물의 열화된 부분에 보수용으로 사용하였을 때, 보수된 부분에서 건조수축을 효과적으로 저감시켜 건조수축에 의한 균열 발생 요인을 저감시켜 균열 발생에 따른 내구성 저하 현상을 방지하는 효과를 발휘한다. 특히 균열이 발생하기 쉬운 습도가 낮은 환경에서 이러한 유리한 효과가 더욱더 기대된다. The advantageous properties of the mortar composition according to the present invention are that when the mortar composition of the present invention is used for repairing the deteriorated portion of the concrete structure, the drying shrinkage is effectively reduced in the repaired portion, So that the effect of preventing the durability deterioration due to the occurrence of cracks can be prevented. This advantageous effect is particularly expected in an environment where cracks tend to occur and humidity is low.
또한 본 발명에 따른 모르타르 조성물은 습도가 낮은 환경에서도 일정부분 수분을 공급하는 작용을 하여 지속적인 강도증진에도 큰 효과를 발휘하게 되는 장점을 가진다. In addition, the mortar composition according to the present invention has an advantage that it exerts a large effect on continuous strength enhancement since it acts to supply a certain amount of moisture even in a low humidity environment.
Claims (6)
시멘트계 결합재 100중량부에 대하여 각각 인산 개질 산화칼슘계 팽창재 4-6중량부, 산성백토 0.5-1.5중량부, 및 잔골재 50~300중량부로 포함하며;
인산 개질 산화칼슘계 팽창재는, 섭씨 900 ~ 1,100도의 온도에서 산화칼슘 클링커를 소성하여 분쇄한 분말에, 인산수용액을 분무하면서 혼련하여 제조된 것이고;
산성백토는 2,500∼4,000cm2/g의 비표면적을 가지는 것임을 특징으로 하는 콘크리트 구조물 보수용 균열제어형 모르타르 조성물.
Cement based binder, phosphate modified calcium oxide based expanding material, acidic clay and fine aggregate,
4 to 6 parts by weight of a phosphoric acid-modified calcium oxide-based expanding agent, 0.5 to 1.5 parts by weight of an acidic white clay, and 50 to 300 parts by weight of fine aggregate, based on 100 parts by weight of the cementitious binder;
The phosphoric acid-modified calcium oxide-based expansion material is produced by spraying an aqueous phosphoric acid solution on a powder obtained by firing a calcium oxide clinker at a temperature of 900 to 1,100 degrees Celsius;
Wherein the acidic clay has a specific surface area of from 2,500 to 4,000 cm 2 / g.
콘크리트 구조물의 열화부를 제거하고;
열화부가 제거된 부분에 청구항 1에 따른 모르타르 조성물을 충진하는 것을 특징으로 하는 콘크리트 구조물의 보수방법.
As a method of repairing a concrete structure,
Removing the deteriorated portion of the concrete structure;
Wherein the mortar composition according to claim 1 is filled in a part where the deteriorated part is removed.
콘크리트 구조물의 열화부를 제거한 후, 모르타르 조성물을 충진하기 전에, 콘크리트 구조물에서 열화부가 제거된 부분의 표면에 콘크리트 성능회복제 및 프라이머를 도포하는 것을 특징으로 하는 콘크리트 구조물의 보수방법. 6. The method of claim 5,
A method for repairing a concrete structure, comprising the steps of: removing a deteriorated portion of a concrete structure and applying a concrete performance restorer and a primer to a surface of a portion of the concrete structure where the deteriorated portion is removed before filling the mortar composition.
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| KR102248403B1 (en) | 2020-10-14 | 2021-05-10 | 주식회사 제이에스기술 | Mortar composition having emhanced crack control performance and repairing and reinforcing method of concrete structure using the same |
| KR102477406B1 (en) | 2022-06-02 | 2022-12-15 | 대영이엔지씨 주식회사 | Durability-enhanced type mortar composition and repairing method for concrete of road facilities using the same |
| KR102477414B1 (en) | 2022-06-08 | 2022-12-15 | 김준현 | Multi-functional mortar composition and method for repairing and reinforcing concrete and steel structure using the same and inorganic coating agent for protecting surface |
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| JP5888887B2 (en) * | 2011-07-01 | 2016-03-22 | 国立大学法人 東京大学 | Repair material for cracks with water leakage in concrete structures, and repair method for the cracks using the repair material |
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| KR102248403B1 (en) | 2020-10-14 | 2021-05-10 | 주식회사 제이에스기술 | Mortar composition having emhanced crack control performance and repairing and reinforcing method of concrete structure using the same |
| KR102477406B1 (en) | 2022-06-02 | 2022-12-15 | 대영이엔지씨 주식회사 | Durability-enhanced type mortar composition and repairing method for concrete of road facilities using the same |
| KR102477414B1 (en) | 2022-06-08 | 2022-12-15 | 김준현 | Multi-functional mortar composition and method for repairing and reinforcing concrete and steel structure using the same and inorganic coating agent for protecting surface |
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