Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Effects of Replacement Ratio and Fineness of GGBFS on the Hydration and Pozzolanic Reaction of High-Strength High-Volume GGBFS Blended Cement Pastes

고강도 고로슬래그 혼합 시멘트 페이스트의 수화 및 포졸란 반응에 미치는 고로슬래그 미분말의 치환률과 분말도의 영향

  • Jeong, Ji-Yong (High-speed Railroad Systems Research Center, Korea Railroad Research Institute) ;
  • Jang, Seung-Yup (High-speed Railroad Systems Research Center, Korea Railroad Research Institute) ;
  • Choi, Young-Cheol (High-tech Construction Materials Center, Korea Conformity Laboratories) ;
  • Jung, Sang-Hwa (High-tech Construction Materials Center, Korea Conformity Laboratories) ;
  • Kim, Sung-Il (High-speed Railroad Systems Research Center, Korea Railroad Research Institute)
  • 정지용 (한국철도기술연구원 고속철도연구본부) ;
  • 장승엽 (한국철도기술연구원 고속철도연구본부) ;
  • 최영철 (한국건설생활환경시험연구원 첨단건설재료센터) ;
  • 정상화 (한국건설생활환경시험연구원 첨단건설재료센터) ;
  • 김성일 (한국철도기술연구원 고속철도연구본부)
  • Received : 2014.08.12
  • Accepted : 2014.12.22
  • Published : 2015.04.30
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Abstract

This study investigated the fluidity, heat of hydration, setting time, strength development, and characteristics of hydration and pozzolanic reactions of high-strength high-volume ground granulated blast-furnace slag(GGBFS) blended cement pasts with the water-to-binder ratio of 20% by experiments, and analyzed the effects of the replacement ratio and fineness of GGBFS on the hydration and pozzolanic reaction. The results show that, in the high-strength mixtures with low water-to-binder ratio, the initial hydration is accelerated due to the "dilution effect" which means that the free water to react with cement increases by the replacement of cement by GGBFS, and thus, strengths at from 3 to 28 days were higher than those of plain mixtures with ordinary Portland cement only. Whereas it was found that the long term strength development is limited because the hydration reaction rates rapidly decreases with ages and the degree of pozzolanic reaction is lowered due to insufficient supply of calcium hydroxide according to large replacement of cement by GGBFS. Also, the GGBFS with higher fineness absorbs more free water, and thus it decreases the fluidity, the degree of hydration, and strength. These results are different with those of normal strength concrete, and therefore, should be verified for concrete mixtures. Also, to develop the high-strength concrete with high-volume of GGBFS, the future research to enhance the long-term strength development is needed.

본 연구는 물-결합재비 20%를 가지는 고강도 고함량 고로슬래그 혼합 시멘트 페이스트의 유동성, 수화열, 응결시간 그리고 강도 발현 특성, 수화 및 포졸란 반응 특성 등을 실험을 통해 관찰하고, 이를 통해 고로슬래그 미분말의 치환률과 분말도가 수화 및 포졸란 반응에 미치는 영향을 분석하였다. 연구 결과에 따르면 물-결합재비가 낮은 고강도 배합에서는 고로슬래그 미분말로 시멘트를 대체함으로써 시멘트와 결합하는 자유수가 상대적으로 증가하는 dilution effect에 의해 시멘트의 초기 수화가 촉진되어 재령 3일부터 28일까지의 초기 강도는 보통 포틀랜드 시멘트만을 사용한 배합보다 더 높게 나타났다. 반면, 재령이 증가하면서 수화반응속도가 급격히 낮아지고, 고로슬래그 미분말로 시멘트를 대량 치환함에 따라 수산화칼슘이 충분히 공급되지 못하므로 포졸란 반응도가 낮아져 장기강도의 발현이 억제되는 것으로 나타났다. 또한 고로슬래그의 분말도가 높으면 자유수를 더 많이 흡착함으로써 유동성이 저하되고 수화도가 낮아져 강도가 오히려 저하되는 것으로 나타났다. 이와 같은 결과는 보통 강도 콘크리트와는 다른 경향을 나타내는 것으로 향후 콘크리트 배합에 대해 추가 검증이 필요하며, 고로슬래그 미분말을 대량 혼합한 고강도 콘크리트의 개발을 위해서는 장기 강도의 발현율을 더 높일 수 있는 방안에 대한 연구가 필요하다.

Keywords

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