• 제목/요약/키워드: granulated blast furnace slag

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고로슬래그 미분말을 혼입한 레디믹스트 숏크리트의 현장적용성에 관한 실험적 연구 (A Experimental Study on the Ready-mixed Shotcrete Using Granulated Blast Furnace Slag)

  • 최희섭;김동민;장필성;서신석
    • 한국지반공학회논문집
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    • 제25권6호
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    • pp.31-45
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    • 2009
  • 본 연구에서는 레디믹스트(Ready-mixed) 숏크리트 개발을 위해 숏크리트 혼화재로 산업부산물인 고로슬래그 미분말을 적용하였을 때, 이에 따른 현장적용성을 평가하고자 하였다. 우선, 고로슬래그 미분말의 강도발현 특성 및 환경적 불안정 요인을 파악하고자 SEM분석 및 중금속 용출시험을 수행한 후 다양한 실험변수들을 적용하여 실내실험과 현장실험을 수행하였다. SEM분석과 중금속용출 실험결과, 고로슬래그 미분말의 혼입으로 인해 솟크리트 조직의 치밀화 및 유해항목 미검출로 인한 환경적 안전성을 확인하였다. 실내실험과 현장실험결과, 고로슬래그 미분말은 일반 Plain 배합보다 강도증진 및 내구성 개선효과가 우수하게 나타났으며, 알칼리활성제 혼입을 통해 기존 고로슬래그 미분말의 수화반응의 지연으로 인한 초기강도발현의 문제점을 다소 효과적으로 개선시킬 수 있는 계기가 되었다고 판단된다. 또한 고로슬래그 미분말의 적정 혼입량은 30% 이내로 적용하는 것이 바람직하며, 경제성 측면에서도 실리카 흄 가격의 약 5% 정도의 수준으로 저렴하기 때문에 산업부산물인 고로슬래그 미분말의 경제적 재활용 및 분말형 레디믹스트 숏크리트 개발에도 적용이 충분히 가능할 것으로 판단된다.

고로슬래그미분말을 혼입한 수중불분리콘크리트의 특성에 관한 연구 (A Study on the Characteristics of Antiwashout Underwater Concrete Using Finely Ground Granulated Furnace Blast Slag)

  • 이상명;최홍윤;이환우;김명식
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
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    • pp.95-98
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    • 1999
  • Recently, the use of the underwater concrete constructions with the antiwashout underwater concrete is increasing. In this study, we investigate the properties of pH, suspended solids, slump flow, box test, air contents of fresh antiwashout underwater concrete and the Unit weight, compressive strength of hardened antiwashout underwater concrete which Ground Granulated Blast Furnace Slag contents 0%, 10%, 20%, 30%, 50%, 60% at 7days and 28days age which is produced and cured in the water and sea water. As a result, Ground Granulated Blast Furnace Slag contents 30% was excellent.

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고로슬래그 미분말을 사용한 고유동콘크리트의 내동해성에 관한 실험적 연구 (An Experimental Study on the Frost Resistance of High-Flowing Concrete Using Granulated Blast-Furnace Slag)

  • 김무한;권영진;강석표
    • 콘크리트학회논문집
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    • 제12권2호
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    • pp.43-51
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    • 2000
  • This study is to investigate for the frost resistance of high-flowing concrete using finely ground granulated blast-furnace slag with experimental parameters, such as type of binder, type of superplasticizer and method of curing. The resistance to freezing and thawing of high-flowing concrete by type of binder and superplasticizer is presented differently. Though the frost resistance of high-flowing concrete is satisfactory under standard condition, it is required that high-flowing concrete has entrained air like plain concrete. Because the critical spacing factor, being capacity of frost resistance, of high-flowing concrete is longer that of plain concrete, the frost resistance of high-flowing concrete, using finely ground granulated furnace blast slag, is superior to that of plain concrete.

고로슬래그 미분말 치환에 따른 알칼리-실리카 반응 팽창 저감효과 (The Effect of Ground Granulated Blast Furnace Slag Replacement on Alkali -Silica Reaction)

  • 김지현;전쌍순;엄장섭;진치섭
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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    • pp.431-434
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    • 2005
  • The effect of ground granulated blast furnace slag to prevent detrimental expansion due to alkali-silica reaction was investigated through the ASTM C 1260 method. This method is one of the most commonly used method because results can be obtained within 16 days. Reactive aggregate used is a metamorphic rock. The replacement ratios of portland cement by ground granulated blast furnace slag were 0, 15, 25, 35 and 55 percent, respectively. The results indicate that 35 percent replacement of portland cement by ground granulated blast furnace slag seems to be effective to reduce alkali-silica reaction expansion under this experimental conditions.

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고로슬래그 미분말 콘크리트의 공극구조가 동결융해 저항성능에 미치는 영향 (Effects of Pore Structure of Ground Granulated Blast-Furnace Slag Concrete on Freezing-Thawing Resistance)

  • 이보경;김규용;김래환;신경수;이준
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2014년도 춘계 학술논문 발표대회
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    • pp.284-285
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    • 2014
  • In this study, effects of pore structure of ground granulated blast-furnace slag concrete on freezing-thawing resistance are reviewed. As a result, degradation of freezing-thawing resistance performance was occurred as replacement ratio of ground granulated blast-furnace slag increases under same specified concrete strength condition. It is considered that pore structure of internal binder affects freezing-thawing resistance performance.

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고로슬래그 미분말을 사용한 콘크리트의 동결융해 저항성에 대한 실험적 연구 (An Experimental Study on Freezing-Thawing Resistance of Concrete Using Ground Granulated Blast-Furnace Slag)

  • 남용혁;최세규;김동신;김생빈
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1996년도 가을 학술발표회 논문집
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    • pp.148-153
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    • 1996
  • Concrete with ground granulated blast-furnace slag can be affected by frost attack because the reaction of hydration is slow at the early age. In this study, therefore, the freezing and thawing test has been carried out to investigate the freezing and thawing resistance on concrete with ground granulated blast-furnace slag. The freezing and thawing test has been performed on concrete a blended cement, which was substituted by ground granulated blast-furnace slag with 4 kinds of ratio (non-admixture, 20%, 40% and 60%). And also tested on concrete added the AE agents to the concrete of same mix proportion to search the improvement effects about the resistance. As a result, the freezing and thawing resistance showed a tendency of reduction in proportion to the increase of the substitution ratio. For non-AE concrete, resistances of the freezing and thawing were very poor as the durability index indicated less than 5.8%. For AE concrte, resistance of the freezing and thawing were excellent as the durability index indicated more than 80.9%.

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고로슬래그미분말을 사용한 고유동콘크리트의 시공을 위한 내동해성의 평가 (A Study on the Evaluation of Frost Damage of High-Flowing Concrete using Blast-Furnace Slag)

  • 권영진
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2001년도 학술논문발표회
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    • pp.157-162
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    • 2001
  • Recently, lots of studies for high flowing concrete have been suggested under practical use that it is only a way to solve the confronted problem. However, most studies have been concentrated on the manufacture method and properties of fresh concrete, but there is few studies for the durability of hardened concrete, specially for the freezing and thawing. Therefore this study is to investigate for the resistance of high-flowing concrete using finely ground granulated furnace blast slag to frost with experimental parameters, such as binder, ratio of replacement of granulated furnace blast slag, superplasticizer, curing method and blain surface area of granulated furnace blast slag.

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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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고로슬래그 미분말 콘크리트의 현장적용을 통한 시공성 평가에 관한 연구 (A Study on the Evaluation of Workability from the Application in Construction site with Blast-Furnace Slag Concrete.)

  • 백빈;이규동;이성진
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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    • pp.40-43
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    • 2003
  • This study was performed to verify the effect of workability in construction site using by high strength concrete with granulated blast furnace slag. For the satisfaction of the target strength, the optimized mixing ratio was drawn from the replacement ratio of granulated blast furnace slag and fly-ash. Results from the experiment and the application showed the outstanding quality of concrete and the effects of cost-down.

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초미분말 서냉 슬래그를 혼화재로 사용한 콘크리트의 기초적 특성 (Basic Properties of Concrete with Ultrafine-Blaine Air Cooling Slag as Admixture)

  • 허재혁;정성욱;허재원;임남기
    • 한국건축시공학회지
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    • 제9권2호
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    • pp.77-83
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    • 2009
  • In this study, a test has been carried out to solve the problem with ground granulated blast-furnace slag, low early strength & lack of supply and to find out a way to use as concrete admixture of the ultrafine blaine air cooling slag which is all disposed as the by product of air cooling slag and its test was conducted to the replacement rate of ultrafine blaine air cooling slag & mixing condition of every concrete admixtures by type for the purpose of obtaining later a basic data for practical use of the cement that used ultrafine blaine air cooling slag by conducting comparative analysis. If ultrafine-blaine air cooling slag is used to the concrete following the results, a high efficiency water reducing agent won't be needed much for flow acquisition due to a high increase in flow, and the stripping time of concrete form will be shortened thanks to the acquisition of early strength, And though, it has the problems with long term strength which is similar or a little lower than the 3 types of ground granulated blast-furnace slag, it's still applicable as the substitute materials for 3 types of ground granulated blast-furnace slag at 10, 15% replacement rate of ultrafine-blaine air cooling slag, at which it shows higher activation index than 3 types of ground granulated blast-furnace slag.