• 제목/요약/키워드: blast furnace

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고로슬래그 미분말 대체율에 따른 콘크리트의 공학적 특성에 관한 실험적 연구 (An Experimental Study on the Engineering Properties of Concrete According to the Replacement Ratio of Blast-Furnace Slag)

  • 송민섭;장재봉;김갑수;윤종기;김재환;김무한
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2003년도 학술.기술논문 발표회
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    • pp.5-8
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    • 2003
  • As a part of efforts to obtain high quality and economical efficiency of concrete, blast-furnace slag has been utilized by means of cement replacement. Therefore superior performance can be ensured, environmental pollution can be prevented and economical advantage can be obtained with utilization by cement replacement. But the studies on the blast-furnace slag are not systematic and reasonable. So, it was planed that basic data in regard to technique of manufacturing and economic improvement of concrete is showed with experimental comparison and investigation of engineering properties of concrete utilizing blast-furnace, industry by-product, as cement replacement in this study.

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고로슬래그 미분말 대체율에 따른 콘크리트의 공학적 특성에 관한 실험적 연구 (An Experimental Study on the Engineering Properties of Concrete According to the Replacement Ratio of Blast-Furnace Slag)

  • 송민섭;장재봉;김갑수;윤종기;김재환;김무한
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2003년도 학술.기술논문발표회
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    • pp.5-8
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    • 2003
  • As a part of efforts to obtain high quality and economical of efficiency of concrete, blast-furnace slag has been utilized by means of cement replacement. Therefore superior performance can be ensured, environmental pollution can be prevented and economical advantage can be obtained with utilization by cement replacement. But the studies on the blast-furnace slag are not systematic and reasonable. So, it was planed that basic data in regard to technique of manufacturing and economic improvement of concrete is showed with experimental comparison and investigation of engineering properties of concrete utilizing blast-furnace, industry by-product, as cement replacement in this study.

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이수석고가 고로슬래그 미분말 활용 무시멘트 모르타르의 기초물성에 미치는 영향 (Effect of Adding Gypsum in Blast-Furnace-Based Mortar's Fundamental Properties)

  • 여량량;김준호;박준희;황금광;백병훈;한천구
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2013년도 추계 학술논문 발표대회
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    • pp.137-138
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    • 2013
  • Nowadays, research about using recycled aggregate as alkali activator has been investigated. By the mechanism of Alkali activation, blast furnace slag's potential hydraulis property would be activated. Thee application of this technique is considered as fit for low strength concrete, so it's suitable in concrete secondary production such as bricks and blocks. Aside alkali activator, sulfate could also activate blast furnace slag's potential hydranlis property. In this research, gypsum(CaSO4·2H2O)has been added with blast furnace slag. Fundamental experiment such as flow and strength has been tested to evalnate effect of gypsum's activation property.

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전기분해 알칼리수를 배합수로 활용한 고로슬래그 혼입 콘크리트의 강도 특성 (Strength Property of Concrete Mixed Blast Furnace Slag Using Electrolysis Alkaline Aqueous as Mixed Water)

  • 정수미;김주성;박선규
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2023년도 봄 학술논문 발표대회
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    • pp.135-136
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    • 2023
  • In this study, a concrete was prepared using an alkaline aqueous solution produced by electrolyzing potassium carbonate in order to improve the low initial strength of concrete using blast furnace slag. In order to confirm the increase in initial strength, the compressive strength of specimens was measured on the age of 7, 28 days. As a result, the blast furnace slag concrete using the electrolysis alkaline aqueous solution as the mixed water show high strength more than the blast furnace slag concrete using the general mixed water.

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고로슬래그 콘크리트의 구조체 보정강도(mSn) 산정을 위한 고로슬래그 혼입 구조체 콘크리트의 적산온도법 적용에 관한 실험적 연구 (An Experimental Study on the Application of the Maturity Method of Ground Granulated Blast Furnace Slag(GGBFS) Concrete to Calculate the Concrete Strength Correction Value(mSn))

  • 김한솔;정민구;이한승
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2023년도 가을학술발표대회논문집
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    • pp.147-148
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    • 2023
  • Recently, as blast furnace slag concrete has become widely used, managing the strength of concrete has become important. mSn is a method of correcting the difference in strength between standard cured specimens and concrete exposed to changes in temperature. In this study, the predicted strength based on the maturity of the central and outer parts of the blast furnace slag concrete structure is compared with the actual strength measured through coring. As a result, the actual strength difference between the center and the outer part of the concrete mixed with blast furnace slag was larger than the predicted strength difference.

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Optimal Mixture Proportion for High Performance Concrete Incorporating Ground Granulated Blast furnace Slag

  • Choi Jae-Jin;Kim Eun-Kyum;Yoo Jung-Hoon
    • 콘크리트학회논문집
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    • 제17권3호
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    • pp.473-480
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    • 2005
  • In this study, a mix design for self compacting concrete was based on Okamura's method and concrete incorporated just a ground granulated blast furnace slag. Replacement ratio of slag is in the range of $20-80\%$ of cement matrix by volume. For the optimal self compactability in mixture incorporating ground granulated blast furnace slag, the paste and mortar tests were first completed. Then the slump flow, elapsed time of 500mm slump flow, V funnel time and filling height by U type box were conducted in concrete. The volume of coarse aggregate in self compacting concrete was in the range of $50-60\%$ to the solid volume percentage of coarse aggregate. Finally, the compressive and splitting tensile strengths were determined in the hardened self compacting concrete incorporating ground granulated blast furnace slag. From the test results, it is desirable for self compacting concrete that the replacement of ground granulated blast furnace slag is in the range of $40-60\%$ of cement matrix by volume and the volume of coarse aggregate to the solid volume percentage of coarse aggregate with a limit of $55\%$.

고로슬래그 미분말을 사용한 콘크리트 2차 제품의 고강도화 메커니즘 (High Strengthening Mechanism by Blast Furnace Slag in Concrete Based Products)

  • 김진만;조성현;이대경
    • 청정기술
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    • 제7권2호
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    • pp.109-117
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    • 2001
  • 고로슬래그를 콘크리트의 결합재 또는 혼화재로의 사용은 활성화되어 있으나, 수량을 극히 제한적으로 사용하는 콘크리트 2차제품에 적용한 예는 극히 적다. 본 연구는 고로슬래그의 재활용 용도를 다양화하기 위한 것으로 시멘트의 일부를 고로슬래그로 대체하여 제조한 콘크리트 2차제품의 강도 증진 메커니즘을 분석한 것이다. 연구의 결과 압축강도 $400kgf/cm^2$ 이상의 고강도 스페이서를 개발시 고로슬래그의 사용은 매우 효과적인 혼화재료라는 것을 확인하였다. 고로슬래그의 사용에 의한 압축강도 증진의 주요 메커니즘은 콘크리트 2차제품의 전체 입도 분포가 보다 최밀입도에 가깝게 분포하는 최밀입도이론과 포졸란계 재료가 시멘트 수화물인 $Ca(OH)_2$와 상온에서 장기간에 걸쳐 일으키는 포졸란 반응인 것을 확인할 수 있었다.

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고로슬래그를 사용한 건식 및 습식 재생 잔골재 모르타르의 물리적 특성에 관한 연구 (A Study on the Physical Properties of Recycled Fine Aggregate (by Dry and Wet Type Production formula) Mortar Using Blast Furnace Slag)

  • 심종우;이세현;서치호
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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    • pp.501-504
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    • 2006
  • Recycled aggregate mortar contains plenty of calcium hydroxide to improve the strength of blast furnace slag, although the surface mortar made of recycled aggregate deteriorates adhesion to cement paste and blast furnace slag has a low initial strength. Therefore, this study assumes that the combination with both recycled aggregate and blast furnace slag will produce a better performance. The results of the experiment show that dry mortar made of recycled aggregate provides with higher strength than wet mortar does at the 3-day and 7-day age, while lower at the 28-day age. It indicates that a large amount of cement mortar made of dry recycled aggregate has deteriorated adhesion strength. The mixes with 30% and 50% of blast furnace slag and 50% and 75% of recycled aggregate provide with much better strength at the 7-day age, although they usually have latent hydraulic property at the 28-day age. It indicates that calcium hydroxide($Ca(OH){_2}$) in recycled aggregate has affected ground granulated blast furnace slag.

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고활성 고로슬래그 미분말 모르타르의 압축강도 발현 특성 및 콘크리트 2차 제품용 결합재 활용 가능성 검토 (Properties of Compressive Strength of Mortar Based on High-activated Blast Furnace Slag and Possibility of Concrete Secondary Products)

  • 임재현;김규용;구경모;김홍섭;윤민호;이보경
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2013년도 추계 학술논문 발표대회
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    • pp.66-67
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    • 2013
  • Replacing a large amount of ground granulated blast furnace slag is limited because early age strength is low due to latent hydraulic property despite excellence of long-term strength. This study aimed to examine produceableness of high-activated ground granulated blast furnace slag using slag by-product from steel process. As experimental variable, the properties of strength development were analyzed by setting fineness and replacement ratio of slag by-product, curing conditions, and W/B. The results of study showed that high-activated ground granulated blast furnace slag using slag by-product as an activator improve the compressive strength of mortar. It is expected to be used as binder for secondary product of concrete considering curing and mixing conditions because high-activated ground granulated blast furnace slag can be hydrated by itself.

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On the Improvement of the Combustibility of Waste Plastics used in Blast Furnace

  • Ban, Bong-Chan;Choi, Jin-Shik;Kim, Dong-Su
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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    • pp.751-754
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    • 2001
  • A possibility of using waste plastics as a source of secondary fuel in blast furnace has been of recent interest. The success of this process, however, will be critically dependent upon the optimization of operating systems. for instance, the supply of waste plastics must be reliable as well as economically attractive compared with conventional secondary fuels such as heavy oil, natural gas and pulverized coal. In this work, we put special importance on the improvement of the combustibility of waste plastics as a way to enhance energy efficiency in blast furnace. As experimental variables to approach this target, the effects of plastic particle size, blast temperature, and the level of oxygen enrichment were investigated using a custom-made blast model designed to simulate a real furnace. Lastly, the combustion efficiency of the mixture of waste plastics and pulverized coal was tested. The observations made from these experiments led us to the conclusion that with the increase of both blast temperature and the level of oxygen enrichment, and with the decrease of particle size, the combustibility of waste PE could be improved at a given distance from tuyere. Also it was found that the efficiency of coal combustion decreased with the addition of plastics; however, the combustion efficiency of mixture could be comparable at longer distance from tuyere.

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