KR101064558B1 - Cement composition for high fire resistance and ultra high strength ultra self-compacting concrete - Google Patents
Cement composition for high fire resistance and ultra high strength ultra self-compacting concrete Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- 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
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
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- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/44—Thickening, gelling or viscosity increasing agents
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- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/63—Flame-proofing agents
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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
- C04B2111/00103—Self-compacting mixtures
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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- 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
- C04B2111/343—Crack resistant materials
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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
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- 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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Abstract
본 발명은 고내화성 초고강도˙초유동 콘크리트용 시멘트 결합재의 조성물에 관한 것으로서, 특히 1㎥당 단위결합재량 550~1,240㎏/㎥; 단위배합수량 165~185㎏/㎥; 단위잔골재량 600~900㎏/㎥; 및 단위굵은골재량 400~700㎏/㎥;를 포함하여 조성물을 조성하되; 배합수-결합재비가 상기 조성물 중량 대비 15~30중량%, 잔골재가 상기 조성물 중량 대비 50~65중량%, 굵은골재가 상기 조성물 중량 대비 20중량%로 배합되며, 상기 결합재 대비 0.005~0.1중량%의 증점제를 더 혼입하여 배합하는 것을 특징으로 한다.The present invention relates to a composition of cement binders for high fire resistance ultra high strength super-flow concrete, in particular, the amount of unit binders per 550 ~ 1,240kg / ㎥; Unit compounding quantity of 165 to 185 kg / m 3; Unit fine aggregate 600 ~ 900㎏ / ㎥; And a unit coarse aggregate amount of 400 to 700 kg / m 3; Formulation water-binding material ratio of 15 to 30% by weight based on the weight of the composition, fine aggregate 50 to 65% by weight relative to the weight of the composition, coarse aggregate 20% by weight of the weight of the composition, 0.005 to 0.1% by weight of the binder It is characterized by further mixing and mixing the thickener.
상기와 같은 본 발명에 따르면 일반시멘트에 석회석 미분말을 적정비율로 혼합하여 제조된 결합재와, 유동성 및 재료분리 저항성을 확보하기 위한 규사 및 천연다당류로 수용성 폴리사카라이드(Polysaccharide) 계열의 증점제를 사용하고, 콘크리트의 균열 및 폭렬제어용섬유인 폴리프로필렌과 나일론을 일정량 혼입함으로써 슬럼프 플로 80cm 이상의 높은 유동성과 재료분리저항성, 그리고 3시간 내화성능을 확보할 수 있다.According to the present invention as described above using a water-soluble polysaccharide-based thickener as a binder prepared by mixing the fine limestone powder in a general cement in an appropriate ratio, and silica and natural polysaccharides to ensure fluidity and material separation resistance By mixing a certain amount of polypropylene and nylon, which are cracks and explosion control fibers of concrete, high fluidity and material separation resistance of more than 80cm of slump flow, and fire resistance of 3 hours can be secured.
시멘트, 콘크리트, 초고강도, 초유동, 고내화성, 폴리사카라이드 Cement, Concrete, Ultra High Strength, Ultra Flow, High Fire Resistance, Polysaccharide
Description
본 발명은 고내화성 초고강도˙초유동 콘크리트용 시멘트 결합재의 조성물에 관한 것으로서, 상세하게는 슬럼프 플로 80cm이상의 높은 유동성과 재료분리 저항성을 가지면서 60MPa이상의 압축강도와 내화성능을 동시에 확보하는 고내화성 초고강도˙초유동 콘크리트용 시멘트 결합재의 조성물에 관한 것이다.The present invention relates to a composition of a cemented binder for ultra-high strength super-high strength super-flow concrete, and more specifically, a high refractory candle that has a compressive strength of 60 MPa or more and fire resistance at the same time while having high flowability and material separation resistance of more than 80 cm of slump flow. It relates to a composition of cement binder for high strength super-flow concrete.
일반적으로 철근이 조밀하게 배근된 부재 또는 형상이 복잡하여 다짐하기 어려운 부재, 보통 콘크리트로는 타설이 곤란한 곳 등에 콘크리트를 타설할 경우 진동˙다짐작업 없이 거푸집내 및 철근주위를 치밀하게 채워줄 수 있는 고유동 콘크리트가 적용되고 있다.In general, the members are densely reinforcement or members that are difficult to compact due to the complicated shape.In general, when placing concrete in places where concrete is difficult to place, it is inherently unique to fill the formwork and reinforcement surroundings without vibration and compaction work. Copper concrete is being applied.
그러나 최근 들어 30층 이상의 초고층 건축물이 일반화되면서 주요 구조부재에 사용되는 콘크리트강도 또한 고강도화됨에 따라 기존 고유동 콘크리트에서의 유동성만으로는 변화하는 콘크리트의 요구성능을 만족하는데 한계가 있다.However, as the construction of high-rise buildings with 30 or more floors has become more common in recent years, the concrete strength used for the main structural members is also increased, so there is a limit to satisfying the required performance of concrete, which is changed only by the fluidity of the existing high flow concrete.
이와 함께 고강도화에 따른 단점으로 지적되고 있는 화재시의 폭렬현상으로 인한 부재의 단면결손 현상을 방지할 수 있는 세부적인 기술의 확보가 필연적으로 요구된다.In addition, it is inevitably required to secure a detailed technology that can prevent the cross-sectional defects of the member due to the explosion during fire, which is pointed out as a disadvantage due to the high strength.
기존 고유동 콘크리트의 재료분리에는 모르타르나 굵은 골재의 분리 이외에, 높은 유동성을 얻기 위해 고성능 AE 감수제를 다량 첨가함에 따라 콘크리트 표면에 페이스트상의 물이 떠오르는 분리가 있다. 이러한 분리현상은 펌프압송에 있어서도 막힘의 원인이 되고, 더욱이 타설한 콘크리트에 있어서도 굵은 골재와 모르타르와의 분리를 일으키는 원인이 되기도 한다.In addition to the separation of mortar or coarse aggregate, the material separation of existing high-flow concrete has a separation in which water in paste form on the concrete surface by adding a large amount of high performance AE water reducing agent to obtain high fluidity. This separation causes clogging even in pump pressure, and also causes separation of coarse aggregate and mortar even in poured concrete.
따라서 종래에는 재료분리저항성을 높이기 위한 방안으로 분리저감제(일명 증점제)를 사용하는 방법과, 분리저감제를 사용하지 않고, 분체구성(시멘트, 고로슬래그 미분말, 플라이애쉬 등의 각종 분체를 다량으로 사용)만으로 재료분리저항성을 확보하는 기술(국내특허등록 10-0686353호(명칭: 고내화성 초고강도 콘크리트 조성물), 국내특허등록 10-0686350호(명칭: 초고강도 콘크리트 조성물))이 개시되어 있으나, 이 또한 최대 슬럼프 플로가 70~75㎝ 수준으로써 더욱 더 높은 유동성을 발휘하는 데는 많은 어려움이 있다. 더욱이 고내화성을 달성하기 위해 사용하는 폴리론 섬유를 혼합할 경우 유동성이 급격히 불량해지기 때문에 고유동 콘크리트 고유의 성능을 발휘하지 못하는 문제가 있다.Therefore, conventionally, a method of using a separation reducing agent (also called a thickener) and a powder composition (cement, blast furnace slag fine powder, fly ash, etc.) in a large amount without using a separation reducing agent in order to increase the material separation resistance. Technology to secure the material separation resistance by using only (Korean Patent Registration No. 10-0686353 (name: high refractory ultra high strength concrete composition), domestic Patent Registration No. 10-0686350 (name: ultra high strength concrete composition)) In addition, the maximum slump flow is a level of 70 ~ 75 ㎝ there is a lot of difficulty in showing even higher fluidity. Moreover, when the polylon fibers used to achieve high fire resistance are mixed, there is a problem in that the high fluidity concrete inherent performance cannot be exhibited because the fluidity is rapidly deteriorated.
본 발명은 상기와 같은 문제점을 해결하기 위한 것으로, 일반시멘트에 석회석 미분말을 혼합하여 제조된 결합재와, 유동성 및 재료분리 저항성을 확보하기 위 한 규사 및 천연다당류로 수용성 폴리사카라이드(Polysaccharide) 계열의 증점제를 사용하고, 아울러 폴리프로필렌과 나일론이 혼합된 폭렬제어용 섬유를 추가적으로 혼입하여 슬럼프 플로 80cm 이상의 높은 유동성과 재료분리저항성, 그리고 3시간 내화성능을 확보할 수 있도록 하는 고내화성 초고강도˙초유동 콘크리트용 시멘트 결합재의 조성물을 제공하는데 그 목적이 있다.The present invention is to solve the above problems, a binder prepared by mixing the fine limestone powder in the general cement, and silica and natural polysaccharides of water-soluble polysaccharide (Polysaccharide) series to secure fluidity and material separation resistance High refractory ultra-high strength super-flow concrete with thickening agent and additional mixing of polypropylene and nylon mixed explosive control fiber to ensure high fluidity, material separation resistance and 3 hour fire resistance over slump flow It is an object to provide a composition of cement binder for.
상기와 같은 목적을 달성하기 위한 본 발명의 특징은,Features of the present invention for achieving the above object,
1㎥당 단위결합재량 550~1,240㎏/㎥; 단위배합수량 165~185㎏/㎥; 단위잔골재량 600~900㎏/㎥; 및 단위굵은골재량 400~700㎏/㎥;를 포함하여 조성물을 조성하되; 배합수-결합재비가 상기 조성물 중량 대비 15~30중량%, 잔골재가 상기 조성물 중량 대비 50~65중량%, 굵은골재(입도 5~25㎜)가 상기 조성물 중량 대비 20중량%로 배합되며, 상기 결합재 대비 0.005~0.1중량%의 증점제를 더 혼입하여 배합하는 것을 특징으로 한다.Unit bonding amount of 550-1,240 kg / m 3 per m 3; Unit compounding quantity of 165 to 185 kg / m 3; Unit fine aggregate 600 ~ 900㎏ / ㎥; And a unit coarse aggregate amount of 400 to 700 kg / m 3; Formulation water-binding material ratio is 15 to 30% by weight based on the weight of the composition, fine aggregate is 50 to 65% by weight relative to the weight of the composition, coarse aggregate (particle size 5-25mm) is 20% by weight relative to the weight of the composition, the binder It is characterized by further mixing and mixing the thickener of 0.005 to 0.1% by weight.
여기에서, 상기 고내화성 초고강도˙초유동 콘크리트용 시멘트 결합재의 조성물은 전체 용적의 0.05~2.0부피%로 폭렬제어용 섬유를 더 혼입하여 배합한다.Herein, the composition of the cemented binder for ultra-high strength super high strength super-flow concrete is further mixed and blended with the fiber for controlling the explosion at 0.05 to 2.0% by volume of the total volume.
여기에서 또한, 상기 폭렬제어용 섬유는 폴리프로필렌 50부피%; 나일론 50부피%로 이루어진다.Here, the thermal control fiber is 50% by volume of polypropylene; It consists of 50% nylon by volume.
여기에서 또, 상기 결합재는 시멘트 30~89중량%; 석회석 미분말 10~50중량%; 및 실리카 흄(Silica Fume) 1~20중량%로 이루어지고, 상기 석회석 미분말은 분말도가 3,000~6,000 ㎠/g이다.Here, the binder is 30 to 89% by weight of cement; 10-50% by weight of limestone fine powder; And silica fume (Silica Fume) 1 to 20% by weight, the limestone fine powder has a powder degree of 3,000 ~ 6,000 cm 2 / g.
여기에서 또, 상기 잔골재는 조립율이 2.5~3.0인 일반모래(S1) 5~40부피%; 그 입도가 0.15~0.6㎜인 인조규사(S2) 20~85부피%; 및 그 입도가 0.01~0.3㎜인 인조규사(S3) 10~40부피%으로 이루어진다.Here, the fine aggregate is 5 to 40% by volume of general sand (S1) having an assembly rate of 2.5 to 3.0; 20 to 85% by volume of artificial silica sand (S2) having a particle size of 0.15 to 0.6 mm; And 10-40% by volume of artificial silica sand (S3) having a particle size of 0.01-0.3 mm.
여기에서 또, 상기 인조규사(S2)는 그 입도가 0.3~0.6㎜인 인조규사 60~95중량%; 그 입도가 0.15㎜~0.3㎜미만인 인조규사 5~40중량%로 이루어진다.Here, the artificial silica sand (S2) is 60 to 95% by weight of artificial silica sand having a particle size of 0.3 ~ 0.6 mm; It consists of 5-40 weight% of the artificial silica sand whose particle size is less than 0.15 mm-0.3 mm.
여기에서 또, 상기 인조규사(S3)는 그 입도가 0.15~0.3㎜인 인조규사 50~95중량%,그 입도가 0.01~0.15㎜미만인 인조규사 5~50중량%로 이루어진다.Here, the artificial silica (S3) is composed of 50 to 95% by weight of artificial silica sand having a particle size of 0.15 to 0.3 mm, and 5 to 50% by weight of artificial silica sand having a particle size of less than 0.01 to 0.15 mm.
여기에서 또, 상기 증점제는 천연다당류로 수용성 폴리사카라이드(Polysaccharide) 계열의 증점제이다.Here, the thickener is a natural polysaccharide and is a water soluble polysaccharide (Polysaccharide) thickener.
상기와 같이 이루어지는 본 발명인 고내화성 초고강도˙초유동 콘크리트용 시멘트 결합재의 조성물에 따르면, 고강도로 인한 부재단면의 슬림화, 장스팬화, 경량화 가능하여 교량 등에서는 상부공의 경량화, 장스팬화 등에 따라 기초공의 슬림화, 수량감소가 가능하고, 높은 유동성으로 인하여 종래에는 설계불가능으로 있던 구조형식도 선정 가능할 수 있다.According to the composition of the high-resistance ultra-high strength ˙ super-flow concrete cement binder composition of the present invention made as described above, in the bridge, etc., the foundation hole according to the light weight, long span, etc. It is possible to slim down, reduce the quantity, and select a structural type that was previously impossible to design due to high fluidity.
또한, 상기와 같이 이루어지는 본 발명인 고내화성 초고강도˙초유동 콘크리트용 시멘트 결합재의 조성물에 따르면, 콘크리트 작업원수 및 작업량의 저감하고, 부재단면의 슬림화에 따른 콘크리트량이 감소하며, 고강도화로 인한 거푸집 존치기간이 단축되고, 거푸집 작업이 감소하며, 슬럼프플로 80cm 이상의 높은 유동성에 따른 충진성이 향상되고, 건설현장 소음저감 및 작업환경을 개선할 수 있다.In addition, according to the composition of the high-resistance ultra-high strength ˙ super-flow concrete cement binder of the present invention made as described above, the number of concrete workers and the amount of work is reduced, the amount of concrete due to the slimming of the cross-section of the member is reduced, and the die survival time due to high strength It can shorten, reduce the formwork, improve the filling property due to the high fluidity of 80cm or more slump flow, and can improve the construction site noise reduction and working environment.
이하, 본 발명에 따른 고내화성 초고강도˙초유동 콘크리트용 시멘트 결합재의 조성물을 상세하게 설명하면 다음과 같다.Hereinafter, the composition of the cement binder for high fire resistance ultra high strength super-flow concrete according to the present invention will be described in detail.
하기에서 본 발명을 설명함에 있어, 관련된 공지 기능 또는 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명은 생략할 것이다. 그리고 후술되는 용어들은 본 발명에서의 기능을 고려하여 정의된 용어들로서 이는 사용자, 운용자의 의도 또는 관례 등에 따라 달라질 수 있다. 그러므로 그 정의는 본 명세서 전반에 걸친 내용을 토대로 내려져야 할 것이다.In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.
본 발명에 따른 고내화성 초고강도˙초유동 콘크리트용 시멘트 결합재의 조성물은 결합재에 유동성 및 재료분리 저항성을 확보하기 위한 적정량의 규사 및 천연다당류로 수용성 폴리사카라이드(Polysaccharide) 계열의 증점제를 소량 사용하고, 폴리프로필렌과 나일론이 혼합된 폭렬제어용 섬유를 일정량 혼입하는 데 특징이 있다.The composition of the cement binder for high refractory ultra high strength super-flow concrete according to the present invention uses a small amount of a water-soluble polysaccharide thickener as an appropriate amount of silica and natural polysaccharides to secure fluidity and resistance to material separation. In particular, it is characterized by mixing a certain amount of the fiber for the thermal control mixed with polypropylene and nylon.
구체적인 배합범위는 하기 표 1과 같다.Specific blending ranges are shown in Table 1 below.
(1) 결합재(1) binder
시멘트와 석회석 미분말과, 실리카 흄을 일정 비율로 혼합하고, 결합재의 단위량은 1㎥당 550~1,240㎏/㎥ 확보되도록 하여 고내화성 및 초고강도 발현에 문제없도록 한다.Cement, limestone fine powder, and silica fume are mixed at a predetermined ratio, and the unit amount of the binder is secured at 550-1,240 kg / m 3 per m 3 so that high fire resistance and ultra high strength can be avoided.
본 발명에서는 시멘트의 고내화성 및 조기 강도 발현의 목적으로 석회석 미분말을 채택하고, 이미 초고강도 발현에 유용한 효과가 있는 것으로 알려진 실리카흄을 채택하고 있다.In the present invention, the limestone fine powder is adopted for the purpose of expressing high fire resistance and early strength of cement, and silica fume, which is known to have a useful effect in the development of ultra high strength, is adopted.
또한, 석회석 미분말은 탄산칼슘(CaCO3) 함량이 80~95중량%이고, 분말도가 3,000~6,000c㎡/g인 석회석 분말을 지칭한다. 이러한 석회석 미분말은 건식 시멘트 제조 공정 중 소성로(kiln)에 석회석 분말을 투입하는 과정에서 발생하는 분말을 포집함으로써 얻을 수 있다.In addition, the limestone fine powder refers to a limestone powder having a calcium carbonate (CaCO 3 ) content of 80 to 95% by weight and a powder degree of 3,000 to 6,000 cm 2 / g. The limestone fine powder can be obtained by collecting the powder generated in the process of injecting the limestone powder into the kiln during the dry cement manufacturing process.
결합재의 혼합비율은 하기 표 2와 같은 비율로 설정하도록 하며, 이는 콘크리트의 유동성과 강도를 고려하여 설정된 것이다.The mixing ratio of the binder is set to the ratio shown in Table 2 below, which is set in consideration of the flowability and strength of the concrete.
(2) 배합수(2) compounding water
유해물질을 포함하지 않은 물(지하수, 수도수 등)로 일반 콘크리트와 동일한 배합수이다. 본 발명에서는 초고강도 발현을 위해 통상 콘크리트 배합에서와는 달리 1㎥당 165~185㎏/㎥의 낮은 범위에서 결정되는데, 이는 유동성을 크게 저하시키기 않으면서 수화열 저감을 고려한 것이다.Water that does not contain harmful substances (ground water, tap water, etc.) is the same mixing water as general concrete. In the present invention, in order to express ultra high strength, it is determined in a low range of 165 ~ 185kg / ㎥ per 1㎥ unlike the concrete mixing, which is to consider the reduction of heat of hydration without significantly reducing the fluidity.
(3) 잔골재(3) fine aggregate
모래(S1)와 인조규사(S2, S3)의 혼합으로 이루어지는 데, 혼합비율은 하기 표 3과 같은 비율로 설정한다.It consists of a mixture of sand (S1) and artificial silica sand (S2, S3), the mixing ratio is set to the ratio shown in Table 3 below.
한편, 인조규사(S2)는 그 입도가 0.3~0.6㎜인 인조규사 60~95중량%, 0.15㎜~0.3㎜미만인 인조규사 5~40중량%로 이루어진다.On the other hand, artificial silica (S2) is composed of 60 to 95% by weight of artificial silica sand having a particle size of 0.3 ~ 0.6mm, 5 to 40% by weight of artificial silica sand less than 0.15mm to 0.3mm.
그리고, 인조규사(S3)는 그 입도가 0.15~0.3㎜인 인조규사 50~95중량%, 0.01~0.15㎜미만인 인조규사 5~30중량%로 이루어진다.In addition, the artificial silica (S3) is made of 50 to 95% by weight of artificial silica sand having a particle size of 0.15 to 0.3 mm, 5 to 30% by weight of artificial silica sand of less than 0.01 to 0.15 mm.
(4) 굵은골재(4) coarse aggregate
통상 콘크리트에 사용되는 굵은골재(자갈)로, 그 입도가 5~25mm인 단위굵은골재량은 1㎥당 400~700㎏/㎥ 범위에서 선택하도록 한다.Coarse aggregate (gravel) is usually used for concrete, the unit coarse aggregate with a particle size of 5 ~ 25mm is to be selected in the range of 400 ~ 700㎏ / ㎥ per 1㎥.
(5) 배합수-결합재비(W/B)(5) Formulation Water-Binder Ratio (W / B)
설계강도 60MPa 초고강도 및 초유동성 콘크리트 발현을 위하여 15~30중량%를 사용한다.Design strength 60MPa 15 ~ 30% by weight is used to develop super high strength and super flow concrete.
(6) 잔골재율(S/a)(6) Fine aggregate fraction (S / a)
전체 골재(잔골재+굵은골재)의 체적에 대한 잔골재의 체적비로서 콘크리트의 유동성을 결정하는 수치이며, 잔골재의 조립율을 고려하여 50~65부피% 수준에서 설정하도록 한다.The volume ratio of fine aggregates to the volume of total aggregates (grain aggregates + coarse aggregates) is a numerical value that determines the fluidity of concrete, and should be set at 50 ~ 65% by volume considering the assembly rate of fine aggregates.
(7) 증점제 : 수용성 폴리사카라이드(Polysaccharide) 계열의 증점제(7) Thickener: Water-soluble polysaccharide thickener
본 발명에서 증점제는 굳지 않은 콘크리트의 재료분리저항성을 증가시킬 목적으로 소성점도나 항복치 등의 필요한 레올로지 특성을 부여하기 위하여 사용된다. 본 발명에서 사용하는 증점제는 균체에 알칼리게네스(Alcaligenes) ATTC31555를 사용하는 천연다당류계 증점제, 즉 천연다당류로 수용성 폴리사카라이드(Polysaccharide) 계열의 증점제로써 소량의 첨가량으로 재료분리저항성 및 유동성을 크게 향상시킬 뿐만 아니라 온도 및 단위수량 변화에 의한 슬럼프 플로의 경시변화가 작아 우수한 자기충전성을 부여하는 효과가 있다. 적정 사용량은 결합재중 시멘트 중량 대비 0.005~0.1중량%가 바람직하다.In the present invention, the thickener is used to impart necessary rheological properties such as plastic viscosity and yield value for the purpose of increasing the material separation resistance of the unconsolidated concrete. The thickener used in the present invention is a natural polysaccharide thickener using alkali genus (Alcaligenes) ATTC31555, that is, a water-soluble polysaccharide thickener as a natural polysaccharide. Not only does it improve, but the change in slump flow due to the change in temperature and unit water amount is small, thereby providing an excellent self-chargeability. The appropriate amount of use is preferably 0.005 to 0.1% by weight based on the weight of cement in the binder.
(8) 폭열제어용 섬유 : 폴리프로필렌(PP) 섬유+나일론 섬유(8) Thermal control fibers: polypropylene (PP) fibers + nylon fibers
경화후 치밀한 구조로 완성되는 초고강도 콘크리트의 폭열을 제어하기 위해 본 발명에서는 폭열제어용 섬유를 혼입하고 있는데, 폭열제어용 섬유는 콘크리트 강도의 손해를 주지 않는 범위 내에서 그 양을 설정해야 할 것이며 구체적으로는 조성물의 전체용적에 대하여 0.05~2.0부피%가 바람직하다.In order to control the thermal expansion of ultra-high-strength concrete that is completed in a compact structure after curing, the thermal control fiber is mixed in the present invention, and the thermal control fiber should be set in an amount within a range that does not damage the concrete strength. Is preferably 0.05 to 2.0% by volume based on the total volume of the composition.
본 발명은 다양하게 변형될 수 있고 여러 가지 형태를 취할 수 있으며 상기 발명의 상세한 설명에서는 그에 따른 특별한 실시 예에 대해서만 기술하였다. 하지만 본 발명은 상세한 설명에서 언급되는 특별한 형태로 한정되는 것이 아닌 것으로 이해되어야 하며, 오히려 첨부된 청구범위에 의해 정의되는 본 발명의 정신과 범위내에 있는 모든 변형물과 균등물 및 대체물을 포함하는 것으로 이해되어야 한다.As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.
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| KR101356380B1 (en) * | 2012-02-22 | 2014-02-05 | 주식회사 포스코건설 | CFT Concrete Composition For Fire Resisting Capacity |
| KR101626860B1 (en) * | 2015-01-14 | 2016-06-02 | 금오공과대학교 산학협력단 | High Strength concreat with hybrid fiber |
| CN109369116B (en) * | 2018-12-19 | 2021-08-13 | 广东工业大学 | Self-compacting concrete and preparation method thereof |
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