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A Study of the Characteristics of the High-flowable Concrete according to the change of charge-time of superplasticize

유동화제 첨가시기에 따른 콘크리트의 특성에 관한 실험적 연구

  • 권춘안 (시립인천전문대학 건축공학과) ;
  • 전현규 (시립인천전문대학 건축공학과)
  • Published : 2003.03.01

Abstract

In order to analyze liquidity change according to increasing the charge of superplasticizer, we inputted charges by dividing into six steps, 0% through 1.25%; at the same time, to observe liquidity change according to the change of charge-time, we carried out the experiment applying 30-minute intervals, i.e. at beginning of mixing, 30, 60 and 90 minutes. The results are below. 1) According to increasing the charge of superplasticizer, the liquidity of concrete was enhanced, however, when inputted 1.25%, a little segregation was occurred, which allowed us to make a conclusion that concrete performance would be deteriorated due to this segregation. 2) When we inputted 1.25% of superplsticizer, steady liquidity features were shown regardless of the charge-time of concrete, which allowed us to make a conclusion that this input would be the best for liquidity performance considering only liquidity features. 3) After analyzing the dynamical features of liquid concrete, the result showed that there was not significant effect on revelation of compressive strength. We concluded form this result that there was no influence on the stripping-time of a mold form. 4) When we charge superplasticizer in concrete more than 1%, we, in advance, should clearly judge the concrete performance required during constructing in site, as it were, the compressive strength or liquidity etc.; furthermore, we had better decide a charge and input-time of superplasticizer to meet the required performance.

Keywords

References

  1. 건설교통부, 초유동 콘크리트의 개발 및 실용화 연구, 대우건설기술연구소, 1996. 10
  2. 대한토목학회, 유동화 콘크리트 시공지침(안).동해설, 대한토목학회, 1991. 10
  3. 선경건설 부설연구소, 고성능 콘크리트 실용화 기술개발, 선경건설 부설연구소, 1995. 12
  4. J.P.H.Frearson and D.D.Higgins, Effect of Test Procedures on the Assessment of Sulfate Resistance of Slag Cements, Fly Ash, Silica Fume, Slag, and National Pozzolans in Concrete, volume II, ACI, 1995
  5. M. D. Cohen and B. Mather, ACI Materials Jour., Vol. 88, No.1, 1991
  6. 名和豊春深谷泰文.鈴木淸孝.柳田克己, 高ヒライト系匕メソトを用いた 高流動.高强度コンクリートに關する硏究, コンクリートに工學年次論文報告集, Vol.15,No 1, 1993. 6
  7. 超流動コンクリート硏究委員會, 超流動コンクリート硏究委員會報告書(I), 日本コンクリート工學協會, 1993. 5