• 제목/요약/키워드: GGBFS

검색결과 128건 처리시간 0.022초

고로슬래그 미분말을 활용한 콘크리트포장 린콘크리트 보조기층 시험 적용 (Experimental Application of the Ground Granulated Blast-Furnace Slag to the Lean Concrete Subbase Course)

  • 류명찬;유태석;엄주용;김대영;손진군
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2000년도 가을 학술발표회 논문집(II)
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    • pp.1091-1094
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    • 2000
  • An experimental study is carried out to estimate the way of applying the granulated blast furnace slag[GBFS] to the lean concrete subbase of concrete pavement. According to the test results, this application seems promising. For this application, mixing percent of GBFS ranging from 30 to 45 is recommendable at this stage. Expected benefits using GGBFS in the field of concrete pavement include reduced shrinkage crack, reduced pavement thickness, and extended service life.

방호·방폭용 뿜칠형 고성능 섬유보강 시멘트 복합재료 개발을 위한 레올로지 특성 연구 (A Study on the Rheology Properties for Development of Sprayed High Performance Fiber Reinforced Cementitious Composites for Protection and Blast Resistant)

  • 최연왕;최병걸;박만석;성돈
    • 한국건설순환자원학회논문집
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    • 제2권3호
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    • pp.188-195
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    • 2014
  • 방호 방폭용 뿜칠형 고성능 섬유보강 시멘트 복합재료(HPFRCC) 개발을 위한 기초적인 연구의 일환으로 페이스트, 모르타르 및 HPFRCC 각 단계에서 구성재료의 레올로지 특성을 평가하였다. 페이스트 단계에서 레올로지 실험결과, GGBFs 및 FA의 경우 혼합률 증가에 따라 소섬정도 및 항복응력은 감소되는 것으로 나타났으며, SF의 경우 혼합률 10% 이후부터 소성점도 및 항복응력이 급격하게 증가되는 것으로 나타났다. 모르타르 단계에서 레올로지 실험결과, 잔골재의 종류 즉, 잔골재의 입형 및 입도는 소성점도 및 항복응력에 많은 영향을 미치는 것으로 나타났으며, Vs/Vm의 변화는 항복응력 보다 소성점도에 더 큰 영향을 미치는 것으로 나타났다. HPFRCC 단계에서 유동성 및 레올로지의 실험결과, 섬유 혼입 후 유동성 및 섬유분산성 개선에는 SP 보다 VA가 더 유효한 것으로 나타났다.

고로슬래그미분말을 혼입한 고유동콘크리트에서 골재조합이 콘크리트 유동성상에 미치는 영향에 관한 실험 연구 (The Effect of Combined Aggregates on Fluidity of the High Fluid Concrete Containing GGBFS)

  • 김재훈;윤상천;지남용
    • 한국건축시공학회지
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    • 제3권4호
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    • pp.79-86
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    • 2003
  • The purpose of study is to offer base data for high fluid concrete mix property, as grasp effect of aggregate to reach much more effect for producing high fluid concrete. For this study, there are three types of combined aggregates, river sand + river aggregate(type A), river sand + crusted aggregate(type B), washed sea sand + crushed aggregate(type C) and take a factor, water-contents, water-binder ratio and S/a. And so, we had following conclusion, resulting application-ability of high fluid mortar by K-slump tester to use a handy consistency measuring instrument. And so, we had following conclusion, resulting application-ability of high fluid concrete by K-slump tester to use a handy consistency measuring instrument. 1) In cafe of regular water binder ratio, high fluid concrete suffered much effect of combined aggregates and water binder ratio. Range of water binder ratio by combined aggregates is w/b 0.4 downward(type A and B), w/b 0.35 downward(type C). 2) Water contents to need for producing high fluid concrete is minimum 170kg/$\textrm{m}^3$ without regard to combined aggregates. 3) The effect of S/a on high fluid concrete by combined aggregates is approximately S/a 50% (type A and B), s/a 50-55% (type C). 4) Consistency measuring of high fluid concrete by K-slump tester is possible and first indication value, high fluid concrete can be produced, is 6~10.5cm.

모르타르 숏크리트의 역학성능 및 내구성능 평가 (Evaluation of Mechanical and Durability Performance of Mortar Shotcrete)

  • 박병선;장건영;최영철
    • 한국구조물진단유지관리공학회 논문집
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    • 제23권5호
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    • pp.68-74
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    • 2019
  • 본 연구에서는 부착성능 향상 모르타르 숏크리트의 역학적 특성 및 내구성능에 대한 실험적 연구를 수행하였다. 모르타르 숏크리트는 도로공사 표준시방서에서 제시하고 있는 숏크리트 배합에서 굵은 골재를 100% 잔골재로 치환한 배합을 이용하였다. 바인더로는 OPC와 GGBFS, 무수석고를 이용하였으며, 폴리머는 바인더의 각각 1, 2% 치환하여 사용하였다. 실험을 통해 폴리머를 사용하는 경우 압축강도가 감소하나 부착강도는 Plain 대비 50% 정도 향상되는 것을 확인하였다. 또한 폴리머 혼입 시 건조수축이 감소하고 탄산화 저항성도 향상되었다. 반면 초기 수화 반응에 의한 발열량은 감소하였는데, 이로 인해 초기 압축 강도가 감소한 것으로 판단된다.

POFA 혼입률에 따른 시멘트 모르타르의 초기 물성에 관한 실험적 연구 (An Experimental Study on the Initial Physical Properties of Cement Mortar with POFA)

  • 위광우;이한승
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2015년도 추계 학술논문 발표대회
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    • pp.122-123
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    • 2015
  • Demands for the replacement materials of cement have been increasing due to social problems such as CO2 reduction and exhaustion of resource. Recently industrial by-products, for example GGBFS and fly ash, have been used as an admixture. However Studies on POFA have been insufficient. POFA, which is used in this study, was obtained from burning of palm oil shell and husk from a southern part of Malaysia. In this study, early compressive strength and porosity of cement mortar with POFA are measured, and appropriate fraction of POFA is 10%. In terms of porosity, POFA is used as a filer in mortar. Later, activity index of POFA and long-term experiments are needed.

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고로슬래그 시멘트의 초기강도 발현에 있어서 수산화칼슘의 영향 (An Effect of $Ca(OH)_2$ on Development of an Early Age Strength of GGBFS Cement)

  • 이제방;김재신;소승영;소양섭
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1999년도 봄 학술발표회 논문집(I)
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    • pp.64-69
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    • 1999
  • Slags are by-products of the metallurgical industry. The most important slag from the standpoint of the quantity used as building material is iron blastfurnace slag. Slags are either crystalline stable solid used as aggregates or glassy material used as hydraulic binder. Slag cements are low heat of hydration cements. Slags react more slowly with than portland cement but they can be activated chemically. Activatiors can be either alkaline activators such as soda, lime, sodium carbonate, sodium silicate or sulphate activators such as calcium sulphate or phosphogypsum. So, in this study slaked lime was used as an activator that the compressive strength of this modified cement(M1 type) is high range in early age. And initial setting time of M1 type cement was shorter than conventional cements.

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바이오매스 플라이애시를 활용한 무시멘트 경화체의 특성 (Properties of Non-cement Matrix Using Biomass Fly Ash)

  • 김대연;이상수
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2020년도 봄 학술논문 발표대회
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    • pp.185-186
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    • 2020
  • This study In order to reduce the amount of cement that generates a large amount of carbon dioxide and attempts to find a recycling method to solve environmental problems by using biomass fly ash. Experiments were conducted according to replacement ratio of biomass fly ash based on GGBFS, The test items are flowability, air content, unit volume weight, water absorption, flexural strength and compressive strength. As a result of the experiment, as increased replacement ratio of biomass fly ash, the flowability and air content was increased. As increased replacement ratio, the density was decreased and water absorption was increased. The compressive strength tended to decrease as increased replacement ratio. The flexural strength tended to increased as increased replacement ratio.

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응결시간과 겉보기 활성화 에너지를 이용한 고로슬래그 콘크리트의 압축강도 예측에 관한 연구 (Prediction of Compressive Strength Using Setting Time and Apparent Activation Energy of Blast Furnace Slag Concrete)

  • 김한솔;양현민;이한승
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2021년도 가을 학술논문 발표대회
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    • pp.101-102
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    • 2021
  • The compressive strength of concrete is greatly affected by the temperature inside the concrete at the initial age immediately after pouring. The apparent activation energy of cement and the setting time of concrete are major factors influencing the development of compressive strength of concrete. This study measured the apparent activation energy and setting time according to the change in W/B for each mixing rate of Ground Granulated Blast-Furnace Slag (GGBFS). And after calculating the compressive strength prediction model, the accuracy of the prediction model was evaluated by comparing the predicted compressive strength and the compressive strength.

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CBS-dust 치환에 따른 고로슬래그 다량치환 시멘트 벽돌 품질에 미치는 영향 (Effect of CBS-dust replacement rate on the Qualities of High Volume GGBFS Cement Bricks)

  • 한준희;한수환;김수호;윤치환;한민철;한천구
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2021년도 가을 학술논문 발표대회
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    • pp.105-106
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    • 2021
  • This study examines the performance of CBS-Dust for the utilization of cement bricks as alkali stimulants for furnace slag replacement binders. It converts the CBS-Dust substitution rate and the excess slag substitution rate. According to the analysis, when replacing CBS-Dust with 65~70 % of BS substitution rate and 7.5~10 % of CBS-Dust, it shows excellent performance as an alkali stimulant of BS' potential hydrophobic reaction, and it is expected to be effective for secondary products of BS replaced in large quantities.

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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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