KR920008773B1 - Process for the preparation of cement complex - Google Patents
Process for the preparation of cement complex Download PDFInfo
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- KR920008773B1 KR920008773B1 KR1019890017346A KR890017346A KR920008773B1 KR 920008773 B1 KR920008773 B1 KR 920008773B1 KR 1019890017346 A KR1019890017346 A KR 1019890017346A KR 890017346 A KR890017346 A KR 890017346A KR 920008773 B1 KR920008773 B1 KR 920008773B1
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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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
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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
- 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
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Abstract
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Description
제1도는 본 발명에 의하여 제조된 직접인장강도 및 변형을 측정용 공시체의 평면도 및 단면도.1 is a plan view and a cross-sectional view of a specimen for measuring the direct tensile strength and deformation produced by the present invention.
제2도는 본 발명에 의하여 제조된 동결융해저항성측정, 못박기 및 인발시험용 공시체의 평면도 및 단면도.2 is a plan view and a cross-sectional view of a specimen for freezing and thawing resistance measurement, nailing and drawing test prepared according to the present invention.
제3도는 본 발명에 공시체의 내충격성 시험장치 단면도.3 is a cross-sectional view of the impact resistance test apparatus of the present invention.
제4도는 본 발명에 공시체의 건조수축 및 크리프 시험장치 측면도.4 is a side view of the drying shrinkage and creep test apparatus of the present invention.
본 발명은 건재용 경량, 고강도이고 내구성, 수밀성이 우수하며, 내열, 내화성능이 우수하여 안전성이 높고 건조수축 및 크리-프에 의한 장기 변형이 거의 없으면서 못박기, 톱질, 대패질이 용이한 인공목재의 성능을 갖는 건재용 탄소섬유보강 시리카분말, 플라애이쉬 및 시리카흄 시멘트 복합체의 제조 방법에 관한 것이다.The present invention is lightweight, high strength, durable, watertight for building materials, has excellent heat and fire resistance, high safety, and is easy to nail, saw, and planer with almost no long-term deformation caused by dry shrinkage and creep. It relates to a method for producing a carbon fiber reinforced silica powder, fly ash and silica fume cement composite for building materials having a performance of.
종래의 탄소섬유강화 시멘트재의 제조방법으로는 연속한 장섬유상의 Pitch계 탄소섬유 토우를 일정한 길이로 절단하면서 압축공기 스프레이건의 노즐로부터 시멘트 슬러리와 함께 뿜어 붙여 성형하는 직접분사법과 단섬유상의 Pitch계 탄소섬유를 시멘트 슬러리와 함께 먼저 혼합한후 성형하는 프리믹스법, 탄소섬유 토우를 먼저 1방향 혹은 2방향으로 배치하거나 시-트상의 탄소섬유를 배치한 것에 시멘트 슬러리를 함침시켜 성형한 함침법, 그리고 탄소섬유를 초조하여 지상으로 한것을 시멘트 슬러리중에 성형하는 초조법 등이 알려지고 있다. 이들 방법중 직접분사법은 시멘트 모르터중에 단섬유 자신이 면상으로 뭉치면서 응집해 균일한 분산이 어려우므로 아직 실용화 되지 못하고 있고, 또한 가격이 매우 비싼 폴리아크릴 니트로를 원료로하는 탄소섬유(PAN 계)가 사용되고 있고, 석탄계 핏치 및 석유계 핏치, 석탄액화물 등을 원료로 하는 성능이 우수한 핏치계 탄소섬유는 거의 사용되지 않고 있다. 또한 핏치계 단섬유만을 사용하여 시멘트 슬러리와 함께 혼합한후 성형하는 프리믹스법은 주로 고가인 고순도의 실리카 파우더를 사용하고, 특수 섬유분산용 믹서를 사용하여야 하므로 제조원가가 높은 단점을 가지고 있으며, 아울러 장기에 걸친 포조란 반응을 기대하기 어려운 단점을 갖고 있고, 함침 및 초조법은 실제 사용이 극히 제한되어 있어 거의 사용되지 않고 있다.Conventional methods for producing carbon fiber-reinforced cement materials include direct injection and short-fiber pitch carbon, which are formed by blowing a continuous long-fiber pitch-type carbon fiber tow into the cement slurry from a nozzle of a compressed air spray gun while cutting to a certain length. Premix method in which fibers are first mixed with cement slurry and then molded, impregnated by impregnating cement slurry with carbon fiber tow in one or two directions or sheet-shaped carbon fibers first, and carbon There is a known method of forming the cement into the ground slurry in the cement slurry. Among these methods, the direct injection method has not been put into practical use because it is difficult to uniformly disperse the single fiber itself in a cement mortar as agglomerates in a plane, and carbon fiber made from polyacryl nitro, which is very expensive, as a raw material (PAN type) Pitch-based carbon fibers having excellent performances based on coal pitch, petroleum pitch, and coal liquefaction are rarely used. In addition, the premix method, which is formed after mixing with cement slurry using only pitch-based short fibers, mainly uses expensive high-purity silica powder and a special fiber dispersion mixer, which has a disadvantage of high manufacturing cost. Pozo over has a disadvantage that is difficult to expect a reaction, and impregnation and wetting method is rarely used because the practical use is extremely limited.
본 발명의 목적은, 이와 같은 종래의 탄소섬유강화 시멘트재의 제조방법의 결점을 해결하고, 자원이 풍부한 시리카분말과 산업부산물을 이용한 건재용 경량·고강이면서 내구성 및 수밀성이 우수한 탄소섬유보강시멘트 복합체의 제조를 위한 것으로, 본 발명에 의해 생성되는 시리카분말과 플라이애쉬 및 시리카흄과 같은 저가의 산업부산물을 사용한 건재용 탄소섬유보강 시멘트 복합체는 경량, 고강도이고 장기 변형이 거의 없으며, 내구성·수밀성 내열 안정성이 탁월하고, 인공 목재로서의 성능을 보유함으로서 못박기, 톱질, 대패질이 용이하여, 건재용 비구조 및 구조재로서 활용할 수 있도록 개발한 것으로, 역학적·물리적 성능 및 내열 안정성능이 보통의 시멘트 콘크리트보다 월등한 경량·고강도의 탄소섬유 보강 시멘트 복합체의 제조방법에 관한 발명을 완성하였다.An object of the present invention is to solve the drawbacks of the conventional method for producing a carbon fiber reinforced cement material, and to provide a carbon fiber reinforced cement composite which is lightweight, high strength, durable and watertight for building materials using resource-rich silica powder and industrial by-products. For manufacturing, the carbon fiber reinforced cement composite for building materials using the silica powder produced by the present invention and inexpensive industrial by-products such as fly ash and silica fume is light in weight, high strength, hardly deforms in the long term, and is durable and water resistant. This excellent, artificial wood has the ability to be nailed, sawed, and planed by retaining its performance as an artificial wood, and has been developed to be used as a non-structural and structural material for building materials.The mechanical and physical performance and the heat resistance stability are superior to those of ordinary cement concrete. Method of manufacturing a lightweight, high strength carbon fiber reinforced cement composite The invention was completed.
이하, 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail.
탄소섬유보강 시리카분말-시멘트 복합체의 제조 : 비중 2.50∼2.65, 입경 5∼200㎛의 규사 분말과 인장 강도 7,500∼38,000kgf/㎠, 탄성계수 3.5∼25.0×105kg/㎠, 직경 6.5∼20㎛인 PAN계 탄소섬유 및 Pitch계 탄소섬유를 섬유길이 3∼20mm, 혼입율은 1.0∼5.0%용적비로 하고, 증점제로는 0.5∼1.5%(중량비)의 메칠셀루로즈를 사용하나 벤토나이트를 메칠셀루로즈의 2∼3배를 대신 사용할 수 있고, 소포제로는 활성소포제(Active deformer : 30%, 비중 1.0)를 사용한다.Preparation of Carbon Fiber Reinforced Silica Powder-Cement Composite: Silica Powder with Specific Gravity 2.50 ~ 2.65, Particle Size 5 ~ 200㎛, Tensile Strength 7,500 ~ 38,000kgf / ㎠, Elastic Modulus 3.5 ~ 25.0 × 10 5 kg / ㎠, Diameter 6.5 ~ 20 PAN-based carbon fibers and Pitch-based carbon fibers having a diameter of 3 to 20 mm and a mixing ratio of 1.0 to 5.0% by volume, and methyl cellulose of 0.5 to 1.5% (weight ratio) are used as the thickener, but bentonite is methylcellulose. 2 ~ 3 times of can be used instead, and antifoaming agent (Active deformer: 30%, specific gravity 1.0) is used.
본 발명품의 제조를 위한 PAN계 및 Pitch계 탄소섬유의 최적길이는 3∼6mm이나 용도에 따라 3∼20mm까지 사용할 수 있고 최적혼입량은 용적비로 1∼3%이나 감수제 및 증점제의 중량에 따라 5%까지 사용할 수 있다.The optimum length of the PAN and Pitch carbon fiber for the production of the present invention is 3 to 6 mm, but can be used up to 3 to 20 mm depending on the application. The optimum mixing amount is 1 to 3% by volume, but 5% by weight of the water reducing agent and thickener. Can be used until.
믹서는 섬유분산용 옴니믹서를 사용하면 좋으나, 섬유길이 3∼6mm, 혼입률 3% 미만이고, 감수재 3∼5%사용시는 보통의 시멘트·콘트리트 혼합용 믹서를 사용해도 섬유의 균등분산이 가능하다.The mixer may use an omni-mixer for fiber dispersion, but the fiber length is 3 to 6 mm and the mixing ratio is less than 3%. When using the 3 to 5% water-reducing material, it is possible to uniformly disperse the fibers even with a normal cement / concrete mixing mixer. .
이때 물·시멘트비는 강도 및 경량화 목표에 따라 20∼110%로 한다. 믹싱시간은, ① Dry bland : 2분(시멘트, 규사분말), ② Primary blend : 3∼4분(물,혼화제), ③ Secondary blend(탄소섬유 3분간 투입) : 2분간 믹싱하고 회전속도는 300∼400rpm으로 하여 6∼9분간 슬러리 상태로 혼합하여 유입성형하거나 프레스 성형한다.At this time, the water-cement ratio is 20 to 110% depending on the strength and the weight reduction goal. Mixing time: ① Dry bland: 2 minutes (cement, silica sand powder), ② Primary blend: 3 ~ 4 minutes (water, admixture), ③ Secondary blend (Carbon fiber for 3 minutes): Mix for 2 minutes and the rotation speed is 300 The mixture is in a slurry state at a temperature of ˜400 rpm for 6 to 9 minutes, followed by inflow molding or press molding.
양생방법은 오토클래브양생(180°±5℃ , 10기압, 3∼5시간)을 행함에 의하여 경량·고강도이고, 내구성 및 내열안정성이 높으면서 장기 변형이 거의 없는 탄소섬유 보강 시멘트 복합체를 제조할 수 있다. 이 양생은 용도에 따라 촉진 온수양생도 가능하나 상술 오토클래브 양생의 경우에 비하여 강도·내구성 및 안정성이 작다. 사용 시리카분말을 SiO290%이상의 고순도인 것으로 시리카분말의 혼입량 10∼70%(중량비)를 사용한다. 플라이애쉬와 혼용시는 시리카분말 함량 20∼40%(플라이애쉬+시멘트의 중량비)의 사용이 적당하다.The curing method is to produce a carbon fiber reinforced cement composite with autoclave curing (180 ° ± 5 ° C, 10 atm, 3 to 5 hours), light weight, high strength, high durability and heat stability, and almost no long-term deformation. Can be. This curing can be accelerated hot water curing depending on the application, but the strength, durability and stability are lower than those of the above-described autoclave curing. The silica powder used has a high purity of 90% or more of SiO 2 , and 10 to 70% (by weight) of the silica powder is used. When used in combination with fly ash, the use of Silica powder content of 20-40% (weight ratio of fly ash + cement) is appropriate.
상술한 방법에 따라 제조된 탄소섬유보강 시리카분말-시멘트 복합체는 탄소섬유 혼입율 1∼3%(용적비), 물·시멘트비 30∼110%, 시리카분말의 혼입량(시멘트에 대한 중량비) 30∼70%의 경우 기건 비중은 0.8∼1.4정도로 된다.The carbon fiber-reinforced silica powder-cement composite prepared according to the above-mentioned method has a carbon fiber content of 1 to 3% (volume ratio), water and cement ratio of 30 to 110%, and a content of silica powder (weight to cement) of 30 to 70%. In this case, the specific gravity is about 0.8 to 1.4.
탄소섬유보강 시리카분말-시멘트 복합체의 강도 측정의 실시예로 물·시멘트비 20∼55%이고 시리카분말의 시멘트에 대한 중량비 10∼50%, 탄소섬유 혼입율 2∼5%(용적비), 고성능 감수제 2∼6%(중량비), 소포 제1%(중량비), 메칠셀루로즈 0.5∼1.5%(중량비)를 사용한 경우 압축정도는 210∼650kg/㎠, 인장강도 110∼150kg/㎠, 휨강도 140~320kg/㎠의 고강도를 얻을 수 있고, 인장변형율은 시멘트 매트릭스의 약 20∼40배(8000∼11,000×10-6)정도로 연성적 성질을 나타내고 30∼50배 정도의 휨인성을 나타낸다.Examples of the strength measurement of carbon fiber reinforced silica powder-cement composites include water and cement ratios of 20 to 55%, weight ratios of cements to cements of 10 to 50%, carbon fiber content of 2 to 5% (volume ratio), and high performance water reducing agents. When 6% (weight ratio), antifoam 1% (weight ratio), methyl cellulose 0.5-1.5% (weight ratio) were used, the degree of compression was 210-650kg / ㎠, tensile strength 110-150kg / ㎠, flexural strength 140-320kg / ㎠ The high strength can be obtained, and the tensile strain is about 20 to 40 times (8000 to 11,000 × 10 -6 ) of the cement matrix, and exhibits ductile properties, and exhibits flexural toughness of about 30 to 50 times.
또한, 동일조건의 탄소섬유보강 시리카분말-시멘트 복합체의 건조 수축은 오토클래브 양생시간 동안 거의 종료되어 재령 6개월에서 보통 시멘트 모르터의 1/5∼1/10정도로 작으면서 내크리프 특성은 보통 시멘트 모르터에 비하여 20∼40배로 우수하여 장기 변형이 거의 일어나지 않으며 Izod내충격 강도는 보통 시멘트 모르터의 10∼15배 정도로 내구성이 우수하다.In addition, the dry shrinkage of the carbon fiber-reinforced Silica powder-cement composite under the same conditions was almost terminated during the autoclave curing time, which was as small as 1/5 to 1/10 of the normal cement mortar at 6 months of age, while the creep resistance was usually cement. It is 20-40 times better than mortar and hardly deforms long term. Izod impact strength is 10 ~ 15 times higher than that of cement mortar.
상술한 고온·고압에서의 장시간 오토클래브 양생에도 팽창 균열이 거의 발생함이 없이 놓은 내열·내화 안정성과 수밀성을 보유한다. 상술한 실시예와 동일한 시멘트 매트릭스 조건에서 수밀성 파악을 위하여 아웃·푸트투수 시험방법에 준하여 3kg/㎠ 의 수압을 가하여 투수시험을 행한 경우 탄소섬유보강 시리카분말, 플라이애쉬, 시리카흄-시멘트 복합체의 투수량은 2g이하로 우수하고 흡수율 시험을 행한 경우 탄소섬유보강 시리카분말-시멘트 복합체의 수중침적 96시간의 흡수량은 보통의 시멘트 모르터의 약 1/4∼1/5정도로 현저히 나타나고 여기서 최적 탄소혼입율은 1∼3%(용적비), 섬유길이는 3∼6mm정도이다.The above-described autoclave curing at high temperature and high pressure for a long time maintains heat resistance, fire resistance stability and watertightness, which hardly cause expansion cracks. Permeability of carbon fiber-reinforced silica powder, fly ash, and silica fume-cement composite when permeability test was carried out by applying a water pressure of 3 kg / cm 2 in accordance with the out-foot permeability test method to determine watertightness under the same cement matrix conditions as in the above-described embodiment. Under 2 g of silver and the water absorption test was conducted, the absorption of 96 hours of water deposition of carbon fiber-reinforced silica powder-cement composite was remarkably about 1/4 to 1/5 of that of ordinary cement mortar. 3% (volume ratio) and fiber length are about 3-6 mm.
또한, 본 발명에서 제조된 탄소섬유보강 시리카분말-시멘트 복합체는 못을 용이하게 박을 수 있고, 못의 인발 저항은 목재와 같거나 그 이상이며, 목재와 같이 톱으로 절단하거나 대패질 등 가공이 용이한 인공 목재로서의 특징을 가지고 있다.In addition, the carbon fiber reinforced Silica powder-cement composite prepared in the present invention can be easily nailed, the pull-out resistance of the nail is equal to or more than wood, easy to process such as cutting with a saw or planer like wood It has the characteristics of an artificial wood.
물·시멘트비 50%, 시리카분말 50%(시멘트에 대한 중량비), Pitch계 탄소섬유 혼입율 2%, 섬유길이 3mm, 메칠셀루로즈 1.5%, 고성능감수제 1.0% 사용시 인공목재로서의 못인발 시험결과는 표 1에 나타낸 바와같다.50% of water and cement, 50% of silica powder (weight to cement), 2% of Pitch-based carbon fiber content, 2mm of fiber length, 1.5% of methyl cellulose, and 1.0% of high performance water reducing agent. As shown in
[표 1]TABLE 1
못 인발 시험결과Nail Pull Test Results
탄소섬유보강 플라이애쉬 및 시리카흄-시멘트 복합체의 제조 : 화력발전소의 부산물인 비중 2.10∼3.10, Blain비표면적 3,000∼4,000㎠/g, 입경 1∼100㎛, SiO2함량 45%이상인 유연탄 및 무연탄의 플라이애쉬와 훼로시리콘 제조시 부산되는 비중 2.10∼2.30, 비표면적 150,000∼250,000㎠/g, SiO2함량 70%이상, 입경 0.1∼0.4㎛의 시리카흄을 각각 사용하거나, 또는 혼합하여 사용하고, 보강재로는 앞에서 기술한 PAN계 및 Pitch계 탄소섬유를 길이 3∼20mm, 혼입량 1.0∼5.0%(용적비)로 하여 보통 포틀랜드 시멘트 또는 조강 포틀랜드 시멘트와 혼화제로써 고성능 감수제 및 증점제를 1∼5%(중량비), 또는 폴리머 분산제(Stylene Butadiene Rubber Latex 또는 Ethylene-Vinylacetate Emulsion)를 5∼10%(중량비)로 하여 슬러리 상태로 혼합하여 자연상태로 성형하거나, 압출형성 또는 초조법으로 성형한다. 양생방법은 오토크래이브 양생(180±5℃ , 10기압, 3∼5시간)을 원칙으로 하나 필요에 따라 강도는 저하 하지만 증기양생 또는 온수 촉진양생도 가능하다.The by-product of the thermal power plant specific gravity less than 2.10~3.10, Blain surface area 3,000~4,000㎠ / g, particle size 1~100㎛, SiO 2 content of 45% of bituminous coal and anthracite: Preparation of a cement composite carbon-fiber-reinforced fly ash and silica fume Silica fume having a specific gravity of 2.10 to 2.30, specific surface area of 150,000 to 250,000 cm 2 / g, SiO 2 content of 70% or more, and particle size of 0.1 to 0.4 μm, or mixed by using fly ash and ferrocylicone, respectively, As the reinforcing material, the above-mentioned PAN-based and Pitch-based carbon fibers have a length of 3 to 20 mm and a mixing amount of 1.0 to 5.0% (volume ratio). ) Or a polymer dispersant (Stylene Butadiene Rubber Latex or Ethylene-Vinylacetate Emulsion) at 5 to 10% (by weight), mixed in a slurry state to be molded in a natural state, or molded by extrusion or annealing. The curing method is based on autoclave curing (180 ± 5 ℃, 10 atm, 3 ~ 5 hours), but the strength decreases if necessary but steam curing or hot water promoting curing is also possible.
보강재로 사용하는 PAN계 및 Pitch계 탄소섬유의 최적 혼입율은 2차 제품 제조시 1.0∼3.0%(용적비), 섬유길이 3∼6mm정도이고, 재료의 사용량은 플라이애쉬의 사용량 30∼50%(중량비), 시리카흄의 사용량 20∼40%(중량비), 중 메칠 셀루로즈는 0.5∼1.5%(중량비), 벤토나이트를 사용시는 메칠 셀룰로즈의 2∼3배를 사용하고, 물·시멘트비 30∼115% 정도로 하며, 기포제 사용시 혼합율은 0.1∼0.2%(플라이애쉬+시멘트의 용적비)정도를 사용하며, 2차 제품제조를 위한 적정 플로값 180±10정도가 요망된다.The optimum mixing ratio of PAN-based and Pitch-based carbon fibers used as reinforcing materials is 1.0-3.0% (volume ratio) and fiber length of 3-6 mm when manufacturing secondary products, and the amount of material used is 30-50% of fly ash (weight ratio). ), 20-40% (weight ratio) of silica fume, 0.5-1.5% (weight ratio) of methyl cellulose, and 2-3 times of methyl cellulose when bentonite is used, and water-cement ratio of about 30-115% When using foaming agent, the mixing ratio is about 0.1 ~ 0.2% (volume ratio of fly ash + cement), and about 180 ± 10 proper flow value for secondary product manufacturing is required.
실시예로, 플라이애쉬 : 시멘트=40 : 50(중량비), 시리카흄 30%(플라이애쉬와 시멘트에 대한 중량비), PAN계 및 Pitch계 탄소섬유 혼입율 1.0∼3.0%(용적비), 폴리머 분산제 5∼10%(SBR.중량비), 물·시멘트비 30∼90%로 한 경우 기건비중 1.1∼1.4, 압축강도 800∼1,500kg/㎠, 인장강도 100∼160kg/㎠, 휨강도 250∼350kg/㎠, 직접인장 변형율 5,000∼9,000×10-6정도이고, 휨인성은 보통 시멘트 매트릭스의 50∼80배인 경량·고강도이면서 내열성능이 우수한 탄소섬유보강 플라이애쉬, 시리카흄 시멘트 복합체를 제조할 수 있다.By way of example, fly ash: cement = 40: 50 (weight ratio), silica fume 30% (weight ratio with fly ash and cement), PAN- and pitch-based carbon fiber mixing ratio 1.0-3.0% (volume ratio), polymer dispersant 5- 10% (SBR.weight ratio), water and cement ratio of 30 to 90%, 1.1 to 1.4 weight ratio, 800 to 1500 kg / ㎠ compressive strength, 100 to 160 kg / ㎠ tensile strength, 250 to 350 kg / ㎠ flexural strength, direct tension Carbon fiber reinforced fly ash and Silica fume cement composites having a strain rate of 5,000 to 9,000 × 10 −6 and bending toughness of 50 to 80 times that of ordinary cement matrix and excellent heat resistance and excellent heat resistance can be prepared.
탄소섬유보강 플라이애쉬, 시리카흄 시멘트 복합체의 건조 수축은 상술한 오토클래이브 양생 기간 동안 거의 종료되고 재령 6개월에서 보통 시멘트 모르터의 1/5∼1/10 정도로, 내크리프 특성은 20∼40배로 우수하여 장기 변형이 거의 없고, 내동해성은 급속동결융해 저항성 시험결과, 300싸이클까지 질량 변화 및 상대 동탄성 계수의 저하가 거의없이 내동해성이 양호하며 Izod내충격 강도는 보통시멘트 모르터의 10∼15배 정도 높다.The dry shrinkage of the carbon fiber reinforced fly ash and silica fume cement composites was almost finished during the above-described autoclave curing period, and was about 1/5 to 1/10 of the cement mortar at 6 months of age, and the creep resistance was 20-40 times. It has excellent long-term deformation, freeze resistance, and results in rapid freeze-melting resistance test.The freeze resistance is good with almost no mass change and relative dynamic modulus of elasticity up to 300 cycles.Izod impact strength is 10-15 times higher than that of ordinary cement mortar. It is high enough.
또한 상술한 조건의 탄소섬유보강 플라이애쉬, 시리카흄-시멘트 복합체에 대한 아웃·푸트투수 시험방법에 의한 3kg/㎠의 수압을 가한 경우의 투수량은 2g이하이고, 수중 흡수율 시험결과 수중침적 재령의 증가에 수반하여 흡수율은 서서히 증가하나 보통 시멘트 모르터에 비하여는 현저한 흡수율 저하를 나타낸다.In addition, when the water pressure of 3kg / cm 2 was applied by the out-foot permeability test method for the carbon fiber reinforced fly ash and silica fume-cement composite under the above-mentioned conditions, the permeation amount was 2g or less, and the water absorption test result showed an increase in the submerged age. Accompanied by this, the absorption rate is gradually increased, but shows a significant decrease in absorption rate compared to the ordinary cement mortar.
또한, 탄소섬유보강 시리카흄-시멘트 복합체의 경우 고열(180±5℃에서 3∼5시간)에서의 파열 방지를 위해서는 상술한 폴리머 분산제를 사용함에 의하여 방지되고 스테인리스 스틸파우더 20∼50%(중량비)를 혼용함에 의해 압축강도, 2,500∼3,000kg/㎠의 초고강도이면서 내구성, 수밀성 및 내열·내화성능이 우수한 탄소섬유보강 시리카흄-시멘트 복합체를 제조할 수 있다. 따라서, 본 발명에서의 제조된 탄소섬유보강 시리카분말, 플라이애쉬 및 시리카흄-시멘트 복합체는 경량·고강도이고, 장기변형이 거의없고, 내구성, 수밀성, 내열안정성이 기존의 건재용 시멘트 복합체에 비하여 월등함을 특징으로 함이 본 발명의 내용이다.In addition, in the case of carbon fiber-reinforced Sirika fume-cement composites, it is prevented by using the above-described polymer dispersant to prevent rupture at high heat (3-5 hours at 180 ± 5 ° C.) and 20-50% of stainless steel powder (weight ratio). By mixing the carbon fiber reinforced Silica fume-cement composite with excellent compressive strength, ultra high strength of 2,500 ~ 3,000kg / ㎠ and excellent durability, water-tightness and heat and fire resistance. Therefore, the carbon fiber reinforced silica powder, fly ash and silica fume-cement composite prepared in the present invention are light weight and high strength, almost no long-term deformation, durability, water-tightness, and heat stability are superior to conventional cement composites for building materials. It is the content of the present invention that is characterized by.
본 발명을 위하여 이용한 시험방법은, 압축강도는 KSL 5105(시멘트 모르터 압축강도 시험방법), 인장강도는 KSL 5104(시멘트 모르터의 인장강도 시험방법), 휨강도 및 비중시험방법은(JIS R 5201 시멘트의 물리시험방법), 동결융해시험은(ASTM C 666-2 수중 급속 동결융해 시험방법), 건조 수축 시험은 KSF 2424(모르터 및 콘크리트의 길이변화 시험방법), 크리-프 시험은(ASTM C 39-72콘크리트의 크리프 시험방법)에 준하여 시험을 행하였다.Test method used for the present invention, the compressive strength is KSL 5105 (cement mortar compressive strength test method), tensile strength is KSL 5104 (cement mortar test method), flexural strength and specific gravity test method (JIS R 5201 of cement Physical test method), freeze thaw test (ASTM C 666-2 rapid freeze thaw test method), dry shrinkage test KSF 2424 (test method for the change of the length of mortar and concrete), creep test (ASTM C 39- 72 concrete creep test method).
이와 같은 본 발명에서의 탄소섬유보강 시리카분말, 플라이애쉬, 시리카흄-시멘트 복합체는 평균입경이 5∼200㎛의 시리카분말, 1∼100㎛의 플라이애쉬, 0.1∼0.4㎛의 시리카흄을 각각 또는 병용하여 사용하고, 탄소섬유 혼입율 1.0∼5.0%, 섬유길이 3∼20mm, 물·시멘트비 20∼110%로 하여 혼합하여 유입성형 또는 압출성형하고 오토클래이브 양생에 의하여 경량·고강도이면서, 내구성, 수밀성 및 내열안정성이 높은 건재용 제품을 만들수 있는 효과가 있으며, 응용가능한 2차 제품 예로는 케텐윌, 내, 외장판넬, 프리악세스 후로아, 방음 및 전파흡수벽 고강도흄관 및 파이프, 계단 및 영구형틀, 제전성판넬 및 파이프, 면상발열판넬, 측구 및 닥트, 경량칸막이벽, 수조 및 해양구조물 등에 응용이 가능한 이점이 있다.Such carbon fiber-reinforced silica powder, fly ash, and silica fume-cement composites according to the present invention each have a silica particle having an average particle diameter of 5 to 200 µm, a fly ash of 1 to 100 µm, and a silica silica of 0.1 to 0.4 µm, respectively. Used in combination and mixed with 1.0 to 5.0% carbon fiber content, 3 to 20 mm fiber length and 20 to 110% water / cement ratio, mixed by inflow molding or extrusion molding. Lightweight, high strength, durability and watertightness by autoclave curing Secondary products include ketenwill, interior, exterior panels, pre-access flows, high-strength fume pipes and pipes, stairs and permanent frames, There is an advantage that can be applied to antistatic panels and pipes, planar heating panels, side openings and ducts, lightweight partition walls, tanks and offshore structures.
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| KR101144488B1 (en) * | 2004-12-22 | 2012-05-11 | 재단법인 포항산업과학연구원 | Carbon based refractory composition |
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| KR100476498B1 (en) * | 1995-08-25 | 2005-07-07 | 제임스 하디 인터내셔널 파이낸스 비.브이. | Cement formulation |
| KR101144488B1 (en) * | 2004-12-22 | 2012-05-11 | 재단법인 포항산업과학연구원 | Carbon based refractory composition |
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