Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Hydration of Portland Cement Containing Blending Components by Impedance Spectroscopy

임피던스 측정에 의한 혼합재를 포함한 포틀랜드 시멘트의 수화

  • 송종택 (단국대학교 재료공학과) ;
  • 김훈상 (단국대학교 재료공학과) ;
  • 배승훈 (단국대학교 재료공학과)
  • Published : 2002.06.01
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Abstract

In this work, the hydration behaviour of portland cement pastes containing fly ash, blast-furnace slag and silica fume is investigated by Impedance Spectroscopy(IS). As fly ash or blast-furnace slag was added to portland cement, the values of R$_{t(s+1)}$ and R$_{t(s+1)}$ were decreased in the early hydration period. It showed that hydration of cement containing blending components was slower than it of the reference cement paste with the same W/C ratio. However, the cement paste containing silica fume had a large value of R$_{t(s+1)}$ and R$_{t(int)}$due to very rapid pozzolanic reactivity of silica fume in the hydration time. In OPC-fly ash system, a characteristic plateau region appeared between straight-line and semicircle. The plateau region continued to grow in range with the content of fly ash and the hydration time.

본 실험에서는 Impedance Spectroscopy(IS)를 이용하여 플라이 애쉬, 고로 슬래그, 실리카 퓸 등의 혼합재가 치환 첨가된 포틀랜드 시멘트의 수화거동을 검토하였다. 플라이 애쉬 및 고로 슬래그가 시멘트에 치환 첨가될 경우, 수화 초기 IS 의 전기적 변수, $R_{t(s+1)}$과 $R_{t(s+1)}$의 증가폭이 감소하였다. 이것은 동일한 W/C비에서 혼합재를 포함한 시멘트의 수화가 늦게 진행되고 있음을 보여준다. 그러나, 실리카 퓸의 경우 초기에 매우 빠른 포졸란 반응성으로 인하여 플라이 애쉬 및 고로 슬래그가 첨가된 경우에 비해 큰 폭의 $R_{t(s+1)}$ 및 $R_{t(s+1)}$ 변화를 확인 할 수 있었다. OPC-플라이 애쉬계의 경우 반원과 직선 영역 사이에서 특이 할만한 평할한 곡선 영역이 출현하였으며, 수화가 진행되고 플라이 애쉬의 치환첨가량이 증가할수록 그 영역이 증가하였다.

Keywords

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