Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Early Hydration of Portland Cement-Blast furnace Slag System by Impedance Techniques

임피던스 측정법을 이용한 포틀랜드 시멘트 -고로 슬래그계의 초기수화

  • 송종택 (단국대학교 재료공학과) ;
  • 김훈상 (단국대학교 재료공학과) ;
  • 황인수 (단국대학교 재료공학과)
  • Published : 2002.01.01
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Abstract

Impedance Spectroscopy (IS) has been used to study microstructure and hydration mechanism of cement pastes. In this work, the early hydration behaviour of portland cement paste with different blame values and contents of blast-furnace slag was investigated by IS. As slag was added to portland cement, the values of $R_{t(s+1)}$ (the solid-liquid phase resistance) and $R_{t(int)}$ were decreased in the early hydration period. It showed that hydration of cement paste containing slag was slower than it of the reference cement paste. As the content of slag was increased, the values of $R_{t(s+1)}$ was decreased. Furthermore, the diameter of semicircle, $R_{t(int)}$ observed at 72 hours was decreased with the increment of slag content. However, the values of $R_{t(s+1)}$ and $R_{t(int)}$ were increased with blame value of slag from the early hydration period.

임피던스 측정법은 시멘트 페이스트의 수화 진행 시 미세구조의 연속적인 변화를 분석하는데 유용한 수단으로 이용되어 왔다. 본 실험에서는 고로슬래그의 첨가량과 분말도를 달리하여 보통 포틀랜드 시멘트에 첨가한 후 나타나는 페이스트의 초기 수화거동을 임피던스 측정법을 이용하여 관찰하였다. 고로 슬래그가 시멘트에 치환 첨가되면, 수화 초기에는 $R_{t (s+1)}$(고상과 액상에 의한 저항)과 $R_{t(int)}$의 증가폭이 감소하였다. 이것은 고로 슬래그를 포함한 시멘트의 수화가 초기재령에서는 늦게 진행되고 있음을 보여준다. 고로 슬래그의 첨가량이 증가할 수록 $R_{t(s+1)}$이 감소하였으며, 수화 72시간에 출현하는 반원의 직경, $R_{t(int)}$ 역시 고로 슬래그의 첨가량이 증가할 수록 감소하고 있다. 그러나, 첨가된 고로 슬래그의 분말도가 클수록 수화 초기부터 $R_{t(s+1)}$과 $R_{t(int)}$의 수치가 증가하였다.

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References

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