KR101524771B1 - Concrete Additive Composition having High Early Strength - Google Patents
Concrete Additive Composition having High Early Strength Download PDFInfo
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- KR101524771B1 KR101524771B1 KR1020120154073A KR20120154073A KR101524771B1 KR 101524771 B1 KR101524771 B1 KR 101524771B1 KR 1020120154073 A KR1020120154073 A KR 1020120154073A KR 20120154073 A KR20120154073 A KR 20120154073A KR 101524771 B1 KR101524771 B1 KR 101524771B1
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- 239000000203 mixture Substances 0.000 title claims abstract description 20
- 239000000654 additive Substances 0.000 title 1
- 230000000996 additive effect Effects 0.000 title 1
- 239000004568 cement Substances 0.000 claims abstract description 44
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000010881 fly ash Substances 0.000 claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000002270 dispersing agent Substances 0.000 claims description 3
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Inorganic materials [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 3
- 235000019738 Limestone Nutrition 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 239000002518 antifoaming agent Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000010440 gypsum Substances 0.000 claims description 2
- 229910052602 gypsum Inorganic materials 0.000 claims description 2
- 239000006028 limestone Substances 0.000 claims description 2
- 235000010333 potassium nitrate Nutrition 0.000 claims description 2
- 239000004323 potassium nitrate Substances 0.000 claims description 2
- VGTPCRGMBIAPIM-UHFFFAOYSA-M sodium thiocyanate Chemical compound [Na+].[S-]C#N VGTPCRGMBIAPIM-UHFFFAOYSA-M 0.000 claims description 2
- 239000003381 stabilizer Substances 0.000 claims description 2
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims 1
- 229940044172 calcium formate Drugs 0.000 claims 1
- 235000019255 calcium formate Nutrition 0.000 claims 1
- 239000004281 calcium formate Substances 0.000 claims 1
- 238000011065 in-situ storage Methods 0.000 claims 1
- 239000007791 liquid phase Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 8
- 229910001341 Crude steel Inorganic materials 0.000 abstract description 5
- 230000000704 physical effect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 14
- 238000005259 measurement Methods 0.000 description 7
- 238000009833 condensation Methods 0.000 description 5
- 230000005494 condensation Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000000611 regression analysis Methods 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000009415 formwork Methods 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009430 construction management Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
- C04B28/146—Calcium sulfate hemi-hydrate with a specific crystal form alpha-hemihydrate
-
- 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
- C04B18/00—Use 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
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B18/00—Use 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
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
- C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/085—Acids or salts thereof containing nitrogen in the anion, e.g. nitrites
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/32—Aluminous cements
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/50—Defoamers, air detrainers
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/56—Opacifiers
- C04B2103/58—Shrinkage reducing agents
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00068—Mortar or concrete mixtures with an unusual water/cement ratio
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Combustion & Propulsion (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
본 발명은 시멘트의 물성변화 없이 거푸집의 탈형 강도를 발현하는 조강 콘크리트의 조성물에 관한 것으로서,
물-시멘트비(W/C)가 25 내지 40중량부인 거푸집 탈형 강도를 발현하는 현장 타설용 조강 콘크리트의 조성물로서, 상기 시멘트 대비 130 내지 220 중량부의 잔골재와; 상기 시멘트 대비 140 내지 240 중량부의 굵은골재; 상기 시멘트 대비 0.1 내지 15 중량부의 플라이애시; 상기 시멘트 대비 0.1 내지 15 중량부의 고로슬래그 미분말 및; 상기 시멘트 대비 1 내지 5중량부의 분말형 경화촉진제 또는 상기 시멘트 대비 0.5 내지 5중량부의 액상형 경화촉진제 중 적어도 어느 하나인 경화촉진제를 포함함으로써;
상기 콘크리트 조성물에 규정량의 경화촉진제를 더 포함함으로써, 상기 거푸집의 탈형기준인 12시간에 14MPa 이상을 만족하여 거푸집의 탈형기준을 규격화하여 토목건축사업에 이바지할 수 있도록 한 것이다. The present invention relates to a composition of crude steel concrete which exhibits the demolding strength of a form without changing the physical properties of cement,
And a water-cement ratio (W / C) of 25 to 40 parts by weight, wherein the fine aggregate is 130 to 220 parts by weight of the cement; 140 to 240 parts by weight of coarse aggregate relative to the cement; 0.1 to 15 parts by weight of fly ash relative to the above cement; 0.1 to 15 parts by weight of blast furnace slag fine powder relative to the cement; The curing accelerator being at least one of a powder type curing accelerator of 1 to 5 parts by weight of the cement or a liquid type curing accelerator of 0.5 to 5 parts by weight of the cement;
By further including a specified amount of a curing accelerator in the concrete composition, it satisfies 14 MPa or more in 12 hours as a demolding criterion of the dies, so that demolding standards of dies can be standardized and contributed to civil engineering construction business.
Description
본 발명은 시멘트의 물성변화 없이 거푸집의 탈형 강도를 발현하는 조강 콘크리트에 관한 것으로, 특히 거푸집의 탈형기준인 12시간에 14MPa 이상을 만족하여 해체시기를 최대한도로 앞당길 수 있도록 한 거푸집 탈형 강도를 발현하는 현장 타설용 조강 콘크리트의 조성물에 관한 것이다.
The present invention relates to a crude steel concrete which exhibits the demolding strength of a mold without changing the physical properties of the cement. More particularly, the present invention relates to a method for producing a mold steel having a shape demolding strength that satisfies 14 MPa or more in 12 hours, The present invention relates to a composition for a cast-in-place concrete for on-site casting.
일반적으로, 건설 산업의 발전으로 콘크리트 구조물의 규모는 점점 대형화 및 초고층화되고, 이로 인해 최근 합리적이고 경제적인 공사 관리의 중요성이 부각되고 있으며, 특히 콘크리트의 조기강도 발현은 공사기간의 단축뿐만 아니라 거푸집의 경제적인 측면에서도 주요인이 되고 있다. Generally, as the construction industry has progressed, the size of concrete structures has become larger and larger, and the importance of the construction management has been emphasized recently. Especially, the early strength of concrete is not only shortened, Which is also an important aspect of the economy.
여기서, 콘크리트 표준 시방서에서 제시하고 있는 거푸집널의 해체시기는 수직부재(확대기초, 보, 기둥 등)의 경우 콘크리트 압축강도가 5MPa 이상이고, 수평부재(슬래브 및 보의 밑면, 아치 내면 등)는 설계기준강도의 2/3배 이상 또는 최소 14MPa 이상인 경우 해체하도록 규정하고 있다. Here, the demolition time of the formwork board proposed in the concrete standard specification is such that the compressive strength of the concrete is 5 MPa or more in the case of the vertical member (enlarged foundation, beam, column), and the horizontal member (the slab and the bottom face of the beam, Or more than 2/3 times the design strength or at least 14 MPa.
그런데, 콘크리트의 조기강도 발현 성능이 시방서에서 제시하는 기준에 만족하지 못할 경우, 거푸집 해체공사가 제한되므로 긴급을 요하는 공사 또는 한중 콘크리트 공사시의 공기지연이 불가피하며, 이로 인해 상기 구조물의 축조에 요구되는 작업공정을 달성할 수 없는 문제점이 있었다. However, if the performance of the early strength of concrete is not satisfied with the criteria set forth in the specification, it is inevitable that air delay is required at the time of urgent construction or in the case of concrete construction due to the restriction of formwork demolition, There is a problem that the required work process can not be achieved.
따라서, 국내에서도 조기강도 확보를 위한 연구를 통해 재령 초기에 수직부재에 대한 거푸집널의 탈형기준인 5MPa는 만족할 수 있는 방안들이 제시되고 있기는 하지만, 실제 공기단축에 필수요소인 수평부재의 해체기준인 14MPa에 대해 만족할만한 방안 및 연구가 미미한 실정이다. Therefore, in order to secure the early strength in Korea, it is suggested that the deformation standard of 5 MPa, which is the deformation standard of the vertical member in the early stage, is satisfactory in Korea. However, And 14MPa, respectively, are satisfactory.
더욱이, 조기강도의 발현을 위해 1종 보통 포틀랜드 시멘트를 사용하는 경우 단위 시멘트량을 증가시키고 감수율이 높은 혼화제를 사용하는데, 이로 인해 단위재료비의 상승을 유발하고 시멘트 증대에 따른 플로우 수치 변화 및 가사시간 저하 등의 부작용이 발생하는 문제점이 있다.
In addition, when using one kind of ordinary Portland cement for the early strength development, the amount of unit cement is increased and the admixture having a high water retention rate is used. This causes an increase in the unit material cost, There is a problem that a side effect such as deterioration occurs.
이에, 본 발명은 상기한 바의 각종 문제점을 해결하기 위한 것으로서, 상기 거푸집의 탈형기준인 12시간에 14MPa 이상을 만족하여 해체시기를 최대한도로 앞당길 수 있도록 한 거푸집 탈형 강도를 발현하는 현장 타설용 조강 콘크리트의 조성물을 제공하는 데에 그 목적이 있다.
Accordingly, it is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for deformation of a die, which satisfies 14 MPa or more in 12 hours, The object of the present invention is to provide a composition of concrete.
상기한 목적을 달성하기 위한 본 발명은; 물-시멘트비(W/C)가 25 내지 40중량％인 거푸집 탈형 강도를 발현하는 현장 타설용 조강 콘크리트의 조성물로서, 상기 시멘트 100 중량부에 대하여 130∼220 중량부의 잔골재와; 상기 시멘트 100 중량부에 대하여 140∼240 중량부의 굵은골재; 상기 시멘트 100 중량부에 대하여 0.1∼15 중량부의 플라이애시; 상기 시멘트 100 중량부에 대하여 0.1∼15 중량부의 고로슬래그미분말 및; 상기 100 중량부에 대하여 1∼5 중량부의 분말형 경화촉진제 또는 상기 시멘트 100 중량부에 대하여 0.5∼5 중량부의 액상형 경화촉진제 중 적어도 어느 하나인 경화촉진제를 포함한다.
According to an aspect of the present invention, And a water-cement ratio (W / C) of 25 to 40% by weight, wherein the fine aggregate is composed of 130 to 220 parts by weight of fine aggregate based on 100 parts by weight of the cement; 140 to 240 parts by weight of coarse aggregate based on 100 parts by weight of the cement; 0.1 to 15 parts by weight of fly ash based on 100 parts by weight of the cement; 0.1 to 15 parts by weight of blast furnace slag fine powder per 100 parts by weight of the cement; 1 to 5 parts by weight of a powder type curing accelerator based on 100 parts by weight of the cement or 0.5 to 5 parts by weight of a liquid type curing accelerator based on 100 parts by weight of the cement.
이상과 같이 본 발명은 적어도 다음과 같은 효과를 포함한다. As described above, the present invention includes at least the following effects.
첫째, 상기 콘크리트 조성물에 규정량의 경화촉진제를 더 포함함으로써, 상기 거푸집의 탈형기준인 12시간에 14MPa 이상을 만족하여 거푸집의 탈형기준을 규격화하여 토목건축사업에 이바지할 수 있다.First, by including a specified amount of a curing accelerator in the concrete composition, it is possible to standardize the demoulding standard of the form by satisfying the requirement of 14 MPa or more in 12 hours, which is a demoulding standard of the mold, and contribute to civil engineering construction business.
둘째, 상기 콘크리트 조성물은 상기 거푸집의 조기해체시기를 최대한도로 앞당김으로써, 상기 콘크리트의 대량 타설 및 대형구조물의 축조가 가능하고 공사기간의 단축되어 건축비용이 절감된다.
Secondly, the concrete composition can maximize the early dismantling time of the formwork, thereby enabling massive casting of the concrete and construction of a large structure, and shortening the construction period, thereby reducing the construction cost.
도 1은 본 발명에 따른 슬럼프 플로 및 공기량 시험결과를 비교한 그래프,
도 2는 본 발명에 따른 응결 시험결과를 비교한 그래프,
도 3은 본 발명에 따른 회귀분석결과를 비교한 그래프,
도 4는 본 발명에 따른 압축강도 시험결과를 비교한 그래프이다.
1 is a graph comparing the results of slump flow and air amount test according to the present invention,
2 is a graph comparing the results of the condensation test according to the present invention,
FIG. 3 is a graph comparing the results of the regression analysis according to the present invention,
4 is a graph comparing compressive strength test results according to the present invention.
이하, 본 발명에 따른 실시 예를 설명하면 다음과 같다. Hereinafter, an embodiment according to the present invention will be described.
본 발명은 도 1 내지 4에 도시한 바와 같이, 물-시멘트비(W/C)가 25 내지 40중량％인 거푸집 탈형 강도를 발현하는 현장 타설용 조강 콘크리트의 조성물로서, 상기 시멘트 100 중량부에 대하여 130∼220 중량부의 잔골재와; 상기 시멘트 100 중량부에 대하여 140∼ 240 중량부의 굵은골재; 상기 시멘트 100 중량부에 대하여 0.1∼15 중량부의 플라이애시; 상기 시멘트 100 중량부에 대하여 0.1∼15 중량부의 고로슬래그미분말 및; 상기 100 중량부에 대하여 1∼5 중량부의 분말형 경화촉진제 또는 상기 시멘트 100 중량부에 대하여 0.5∼5 중량부의 액상형 경화촉진제 중 적어도 어느 하나인 경화촉진제를 포함한다.As shown in FIGS. 1 to 4, the present invention is a composition for a cast-in-place concrete which exhibits a form demolding strength with a water-cement ratio (W / C) of 25 to 40% by weight, 130 to 220 parts by weight of fine aggregate; 140 to 240 parts by weight of coarse aggregate based on 100 parts by weight of the cement; 0.1 to 15 parts by weight of fly ash based on 100 parts by weight of the cement; 0.1 to 15 parts by weight of blast furnace slag fine powder per 100 parts by weight of the cement; 1 to 5 parts by weight of a powder type curing accelerator based on 100 parts by weight of the cement or 0.5 to 5 parts by weight of a liquid type curing accelerator based on 100 parts by weight of the cement.
먼저, 본 발명을 구성함에 있어서, 상기 콘크리트의 조기강도를 확보하는 것도 중요하지만 콘크리트의 급결은 현장 타설에 있어서 작업성이 용이하지 못한 문제점이 발생할 수 있으므로 콘크리트의 재료의 양은 적정한 조성 관계를 갖도록 하는 것이 우선적으로 고려되어야 한다. First, in constructing the present invention, it is important to secure the early strength of the concrete. However, since the quickness of the concrete may cause difficulty in workability in casting the site, the amount of the material of the concrete may have a proper compositional relationship Should be considered as priority.
특히, 본 발명을 달성하기 위하여, 상기 콘크리트의 조성물 중 상기 물-시멘트비(W/C)는 25 내지 40중량％로 한정하였고, 상기 잔골재율[S/a = 잔골재/(굵은골재 + 잔골재)×100]은 46.5 내지 49.5중량％로 한정하였다. Particularly, in order to achieve the present invention, the water-cement ratio (W / C) of the composition of the concrete is limited to 25 to 40% by weight and the fine aggregate ratio [S / a = fine aggregate / (coarse aggregate + fine aggregate) 100] was limited to 46.5 to 49.5% by weight.
또한, 본 발명을 달성하기 위하여, 상기 시멘트 대비 0.1 내지 15 중량부의 플라이애시를 더 포함할 수도 있고, 상기 시멘트 대비 0.1 내지 15 중량부의 고로슬래그 미분말을 더 포함할 수도 있다. In order to accomplish the present invention, it may further comprise 0.1 to 15 parts by weight of fly ash relative to the cement, and may further comprise 0.1 to 15 parts by weight of blast furnace slag fine powder relative to the cement.
즉, 상기 콘크리트의 조성물을 중량비로 비교할 때, 상기 물(사용수)은 1당 150∼170kg, 상기 시멘트는 400∼600kg으로 한정하였고, 플라이애시는 0.1∼90kg으로, 고로슬래그 미분말은 0.1∼90kg으로 한정하였다. 또한 상기 잔골재는 770∼888 kg, 상기 굵은골재는 843∼968kg으로 한정하였다. That is, when the composition of the concrete is compared in terms of weight ratio, the water (used water) is limited to 150 to 170 kg, the cement to 400 to 600 kg, the fly ash to 0.1 to 90 kg, the blast furnace slag fine powder to 0.1 to 90 kg . The fine aggregate was limited to 770 to 888 kg, and the coarse aggregate was limited to 843 to 968 kg.
여기서, 상기 물-시멘트비가 25중량％ 미만인 경우 급결과 재료의 혼합이 어려운 단점이 있고, 상기 물-시멘트비가 40중량％ 이상인 경우 조기강도의 발현이 지체되는 단점이 있으므로, 상기 물-시멘트비를 25 내지 40중량％로 한정하였다.If the water-cement ratio is less than 25 wt%, mixing of the water-resultant material is difficult. If the water-cement ratio is more than 40 wt%, the early strength development is delayed. To 40% by weight.
그리고, 상기 잔골재율이 46.5중량부 미만인 경우 건조수축량 증가의 단점이 포함되고, 상기 잔골재율이 49.5중량부 이상인 경우 콘크리트 유동성 저하의 단점이 포함되어 상기 잔골재율을 46.5 내지 49.5중량부로 한정하였다.When the fine aggregate fraction is less than 46.5 parts by weight, the disadvantage of increase in the amount of drying shrinkage is included. When the fine aggregate fraction is more than 49.5 parts by weight, the fine aggregate fraction is limited to 46.5 to 49.5 parts by weight.
이때, 상기 콘크리트 조성물에 포함되는 상기 잔골재와 상기 굵은골재는 입도로 구분하였으며, 상기 잔골재의 경우 입도가 5mm 미만인 것을 의미하고 상기 굵은골재는 입도가 5mm이상인 것을 의미한다.At this time, the fine aggregate and the coarse aggregate contained in the concrete composition are classified into particle sizes, and the fine aggregate has a particle size of less than 5 mm, and the coarse aggregate has a particle size of 5 mm or more.
그리고, 상기 플라이애쉬와 상기 고로슬래그 미분말을 상기 시멘트 대비 적정한 함량으로 각각 또는 혼합하여 사용할 수도 있다. The fly ash and the blast furnace slag fine powder may be used individually or in combination as appropriate with respect to the cement.
또한, 상기 플라이애시의 경우 15중량부 이상인 경우 초기재령의 강도발현 지체와 콘크리트 유동성이 저하되는 문제가 발생할 수 있는 단점이 있어, 상기 플라이애시의 함량을 0.1 내지 15중량부로 한정하였다. In the case of the fly ash, if the amount of the fly ash is 15 parts by weight or more, there is a problem that the strength of the initial age and the fluidity of the concrete may be lowered. Therefore, the content of the fly ash is limited to 0.1 to 15 parts by weight.
또한, 상기 고로슬래그 미분말의 경우 15중량부 이상인 경우 조기강도 발현의 지체가 되는 단점이 있어, 상기 고로슬래그 미분말의 함량을 0.1 내지 15중량부로 한정하였다. In the case of the blast furnace slag fine powder, the blast furnace slag fineness is limited to 0.1 to 15 parts by weight when the blast furnace slag fineness is 15 parts by weight or more.
그리고, 상기 경화촉진제 중 상기 분말형 경화촉진제의 경우 시멘트 대비 1 내지 5중량부를 포함하였고, 상기 액상형 경화촉진제의 경우 시멘트 대비 0.5 내지 1.5중량부를 포함하였다.1 to 5 parts by weight of the curing accelerator relative to cement in the case of the powder type curing accelerator and 0.5 to 1.5 parts by weight of the cement in the case of the liquid type curing accelerator are included.
이때, 상기 분말형 경화촉진제와 상기 액상형 경화촉진제를 각각 사용할 수도 있고 혼합하여 사용함이 바람직하다.At this time, the powder type curing accelerator and the liquid type curing accelerator may be used individually or in combination.
이때, 상기 분말형 경화촉진제의 경우 1중량부 미만인 경우 조기강도의 발현이 지체되는 단점이 있고, 5중량부 이상인 경우 빠른 응결로 인한 현장 타설의 어려움이 발생할 수 있어, 상기 분말형 경화촉진제를 1 내지 5중량부로 한정하였다.If the amount of the powdery curing accelerator is less than 1 part by weight, the early strength development is delayed. If the amount of the powdery curing accelerator is more than 5 parts by weight, To 5 parts by weight.
또한, 상기 액상형 경화촉진제의 경우 0.5중량부 미만인 경우 콘크리트 혼합에 있어서 잘 안될 수 있는 단점이 있고, 1.5중량부 이상인 경우 콘크리트의 재료분리가 발생할 수 있는 단점이 있어, 상기 액상형 경화촉진제를 0.5~1.55중량부로 한정하였다.If the amount of the curing accelerator is less than 0.5 parts by weight, it may be difficult to mix the concrete. When the amount of the curing accelerator is more than 1.5 parts by weight, the material may be separated from the concrete. By weight.
그리고, 상기 분말형 경화촉진제는, 질산칼륨 0.1 내지 95 중량% - 알루미나 시멘트 5 내지 10 중량% - a형 반수석고 0.1 내지 10 중량% - 티오시안산나트륨 0.1 내지 10 중량% - 칼슘 포메이트 1 내지 5 중량% - 석회석분말 0.1 내지 50 중량%을 포함함이 바람직하다.The powder type curing accelerator may include 0.1 to 95 wt% of potassium nitrate, 5 to 10 wt% of alumina cement, 0.1 to 10 wt% of a-type semi-gypsum, 0.1 to 10 wt% of sodium thiocyanate, 5% by weight - limestone powder: 0.1 to 50% by weight.
그리고, 상기 액상형 경화촉진제는, 분산제 70 내지 90 중량% - 유기조강제 1 내지 10 중량% - 소포제 0.1 내지 2 중량% - 무기조강제 1 내지 5 중량% - 수축저감제 0.1 내지 5 중량%을 포함함이 바람직하다.
The liquid curing accelerator includes 70 to 90% by weight of a dispersant, 1 to 10% by weight of an organic stabilizer, 0.1 to 2% by weight of an antifoaming agent, 1 to 5% by weight of an inorganic coercive agent, and 0.1 to 5% by weight of a shrinkage reducing agent. .
이하, 본 발명에 따른 실험결과는 다음과 같다. The results of the experiment according to the present invention are as follows.
먼저, 표 1에서와 같이, 콘크리트 단위수량을 160 kg/㎥으로 세팅한 상태에서 3종 조강포틀랜드 시멘트를 사용하여 그 양은 500 kg/㎥를 포함하였고, 특히 잔골재와 굵은골재를 각각 796kg 및 923kg 포함하였다.
First, as shown in Table 1, the amount of concrete unit was set at 160 kg / m 3, and the amount of 500 kg / m 3 of the three kinds of crude steel portland cement was used. Especially, fine aggregate and coarse aggregate were included 796 kg and 923 kg respectively Respectively.
(％)W / C
(%)
(％)S / a
(%)
여기서, W : 사용수, C : 3종 조강포틀랜드 시멘트, S : 잔골재, G : 굵은골재, AD : 분말형 경화촉진제, CS : 액상형 경화촉진제
C: coarse crude steel Portland cement, S: fine aggregate, G: coarse aggregate, AD: powder type curing accelerator, CS: liquid type curing accelerator
*공기량
*응결측정
*압축강도* Slump flow
* Amount of air
* Condensation measurement
* Compressive strength
*경화촉진제는 시멘트에 대비하여 첨가함
* Curing accelerator added to cement
또한, 표 2에서와 같이, 상기 경화촉진제의 경우 상기 시멘트 대비 각각 0, 1, 3, 5중량부를 포함하여, 슬럼프플로실험과 공기량측정실험과 응결측정실험과 압축강도측정실험을 각각 실시하였다.
Also, as shown in Table 2, the slurry flow test, the air content measurement test, the condensation measurement test, and the compressive strength measurement test were performed for the curing accelerator including 0, 1, 3, and 5 parts by weight, respectively.
구분
division
비고
Remarks
Air volume (%)
여기서, 표 3에 의하면, 상기 콘크리트 조성물에 상기 경화촉진제를 포함하는 경우 상기 슬럼프 플로우가 600±100mm를 유지하는 것을 알 수 있음은 물론 상기 공기량이 2.4%미만을 유지함을 알 수 있었다.According to Table 3, when the concrete composition contains the curing accelerator, it can be seen that the slump flow is maintained at 600 ± 100 mm and the air amount is maintained at less than 2.4%.
따라서, 상기 슬럼프 플로우 실험 및 공기량 시험결과, 상기 콘크리트 조성물에 상기 경화촉진제를 포함하는 경우 상기 Plain 대비 슬럼프플로우는 대부분 증가하였지만, 상기 촉진제 5 중량부를 첨가하였을 때는 감소하는 경향을 나타맴을 알 수 있었고, 이에 의해 상기 경화촉진제의 첨가량이 증가함에 있어 슬럼프 플로우는 증가하지만 촉진제 첨가량에 있어 어느 적정량 이상이 되면 슬럼프 플로 증가의 억제함을 알 수 있었다.As a result of the slump flow test and the air content test, when the curing accelerator was included in the concrete composition, the slump flow relative to the plain increased largely, but when 5 parts by weight of the accelerator was added, the slump flow tended to decrease As a result, it was found that the slump flow increased as the addition amount of the curing accelerator was increased, but the slump flow increase was inhibited when the amount of the accelerator was more than the proper amount.
또한, 상기 경화촉진제를 3중량부 정도 첨가하는 경우 공기량이 증가하는 경향을 보였고 상기 경화촉진제 5중량부를 첨가하였을 때는 약간 감소하는 경향을 나타내었지만, 차이가 크지 않은 것으로 보여 상기 경화촉진제가 공기량에 미치는 영향성은 크지 않음을 알 수 있었다.
In addition, when the curing accelerator was added in an amount of about 3 parts by weight, the air amount tended to increase, and when the curing accelerator was added in an amount of 5 parts by weight, the curing accelerator showed a slight decrease. However, The influence was not significant.
(분)Elapsed time
(minute)
(MPa)Measurement result
(MPa)
Remarks
Plain
Plain
혼화촉진제 혼입 콘크리트 -Ⅰ
Mixing accelerator-incorporated concrete-I
혼화촉진제 혼입 콘크리트 -Ⅱ
Mixing accelerator mixed concrete-II
혼화촉진제 혼입 콘크리트 -Ⅲ
Mixing Accelerator Containing Concrete-III
여기서, 표 4에 의하면, 관입저항에 의한 응결 측정결과 상기 경화촉진제의 첨가량이 증가함에 따라 상기 응결 시간이 확연하게 단축하는 것으로 나타났다.According to Table 4, as the concentration of the curing accelerator was increased as a result of measuring the penetration resistance, the curing time was significantly shortened.
따라서, 상기 응결측정결과 경화촉진제는 조강시멘트가 함유하고 있는 C3S의 수화반응을 촉진하여 콘크리트의 응결 시간을 단축한다는 점을 알 수 있었다.
As a result, it was found that the curing accelerator accelerates the hydration reaction of C3S contained in the crude steel cement to shorten the condensation time of the concrete.
division
a
b
여기서, 표 5에 의하면, 상기 콘크리트 조성물에 상기 경화촉진제를 포함하는 경우 상기 회귀분석결과 초결시간은 약 56분 내지 329분이내이고 종결시간이 약 103 내지 410분 이내로 유지함을 알 수 있었다. According to Table 5, when the curing accelerator is included in the concrete composition, it was found from the regression analysis that the curing time was within about 56 minutes to 329 minutes and the curing time was maintained within about 103 to 410 minutes.
따라서, 상기 회귀분석의 초결 및 종결시간의 실험결과, 상기 콘크리트 조성물의 경화촉진제를 5중량부 미만으로 첨가할 경우 약 300분 이상의 응결시간을 단축시킬 수 있었지만, 급결의 문제점이 발생할 수 있을 것으로 판단되어 적정량이 요구될 수 있음을 알 수 있었다.
Therefore, as a result of the results of the screening and closing time of the regression analysis, when the curing accelerator of the concrete composition was added in an amount of less than 5 parts by weight, the curing time of about 300 minutes or more could be shortened, And it can be found that a proper amount can be required.
division
여기서, 표 6에 의하면, 압축강도 측정 결과 경화 촉진제의 첨가함으로써 Plain을 제외한 모든 배합은 재령 12시간에 14MPa를 만족하는 결과를 나타내었음을 알 수 있으며, 특히 상기 경화촉진제가 3 내지 5중량부 첨가된 배합은 9시간에 14 MPa를 상회하는 결과를 나타내었다.
According to Table 6, as a result of the measurement of compressive strength, it was found that all of the blends excluding Plain had a result of satisfying 14 MPa at 12 hours of aging by adding a curing accelerator. In particular, the curing accelerator was added in an amount of 3 to 5 parts by weight The results showed that the blend ratio exceeded 14 MPa at 9 hours.
이상과 같이, 상기 콘크리트 조성물에 상기 경화촉진제를 사용하는 경우, 상기 시멘트를 구성하는 앨라이트의 수화 생성물인 C-S-H의 수화 결정물들이 대량으로 생성된 것을 확인할 수 있었으며, 상기 조강제 사용에 따른 시험체의 조기강도 발현은 앨라이트와 물이 수화반응을 하면서 생성되는 C-S-H의 생성을 촉진시키는 것을 알 수 있었다.
As described above, when the curing accelerator was used in the concrete composition, it was confirmed that a large amount of hydrated crystals of CSH, which is a hydration product of alite constituting the cement, was generated in large quantities. It was found that the expression of early strength promotes the production of CSH produced by hydration of allyl and water.
Claims (1)
상기 시멘트 100 중량부에 대하여 130∼220 중량부의 잔골재와;
상기 시멘트 100 중량부에 대하여 140∼240 중량부의 굵은골재;
상기 시멘트 100 중량부에 대하여 0.1∼15 중량부의 플라이애시;
상기 시멘트 100 중량부에 대하여 0.1∼15 중량부의 고로슬래그미분말 및;
상기 시멘트 100 중량부에 대하여 1∼5 중량부의 분말형 경화촉진제 또는 상기 시멘트 100 중량부에 대하여 0.5∼5 중량부의 액상형 경화촉진제 중 적어도 어느 하나인 경화촉진제를 포함하며,
상기 분말형 경화촉진제는,
질산칼륨 16 내지 93 중량% - 알루미나 시멘트 5 내지 10 중량% - a형 반수석고 0.1 내지 10 중량% - 티오시안산나트륨 0.1 내지 10 중량% - 칼슘 포메이트 1 내지 5 중량% - 석회석분말 0.1 내지 50 중량%를 포함하고,
상기 액상형 경화촉진제는,
분산제 79 내지 90 중량% - 유기조강제 1 내지 10 중량% - 소포제 0.1 내지 2 중량% - 무기조강제 1 내지 5 중량% - 수축저감제 0.1 내지 5 중량%을 포함하는 것을 특징으로 하는 거푸집 탈형 강도를 발현하는 현장 타설용 조강 콘크리트의 조성물. The present invention relates to a composition for a cast-in-place concrete which exhibits a form demolding strength with a water-cement ratio (W / C) of 25 to 40 wt%
130 to 220 parts by weight of fine aggregate based on 100 parts by weight of the cement;
140 to 240 parts by weight of coarse aggregate based on 100 parts by weight of the cement;
0.1 to 15 parts by weight of fly ash based on 100 parts by weight of the cement;
0.1 to 15 parts by weight of blast furnace slag fine powder per 100 parts by weight of the cement;
A curing accelerator which is at least one of a powder type curing accelerator of 1 to 5 parts by weight based on 100 parts by weight of the cement or a liquid type curing accelerator of 0.5 to 5 parts by weight based on 100 parts by weight of the cement,
The powder-type curing accelerator is a powder-
Potassium nitrate 16 to 93 wt% alumina cement 5 to 10 wt% a-type semi-gypsum 0.1 to 10 wt% sodium thiocyanate 0.1 to 10 wt% calcium formate 1 to 5 wt% limestone powder 0.1 to 50 wt% % By weight,
The liquid-phase curing accelerator may include,
Characterized in that the dispersing agent comprises from 79 to 90% by weight of a dispersing agent, from 1 to 10% by weight of an organic stabilizer, from 0.1 to 2% by weight of an antifoaming agent, from 1 to 5% by weight of an inorganic coercive agent, Compositions of Premixed Concrete for In - situ Application.
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| KR20190069867A (en) | 2017-12-12 | 2019-06-20 | 주식회사 삼표산업 | Ultra early strength binder and Ultra early strength concrete using the same |
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| KR0145101B1 (en) * | 1995-12-22 | 1998-07-15 | 유성용 | Method of manufacturing high flowing cement |
| KR100311988B1 (en) * | 1999-09-17 | 2001-10-17 | 최익순 | Water permeable concrete |
| KR100725030B1 (en) * | 2006-02-16 | 2007-06-07 | 주식회사 인트켐 | Concrete Liquid Admixture and Concrete Composition for Initial Strength |
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| KR0145101B1 (en) * | 1995-12-22 | 1998-07-15 | 유성용 | Method of manufacturing high flowing cement |
| KR100311988B1 (en) * | 1999-09-17 | 2001-10-17 | 최익순 | Water permeable concrete |
| KR100725030B1 (en) * | 2006-02-16 | 2007-06-07 | 주식회사 인트켐 | Concrete Liquid Admixture and Concrete Composition for Initial Strength |
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