Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Hydraulic Reaction Analysis of C3A in Ordinary Portland Cement with Mineral Additions by Rietveld Method

리트벨트법에 의한 혼합재 첨가 보통 포틀랜드 시멘트 중 C3A 수화반응 해석

  • Lim, Young-Jin (Department of Minerals Science and Engineering, Kunsan University) ;
  • Lee, Seung-Heun (Department of Minerals Science and Engineering, Kunsan University) ;
  • Cho, Jae-Woo (Advanced Construction Materials Center, Korea Conformity Laboratories)
  • 임영진 (군산대학교 재료공학과) ;
  • 이승헌 (군산대학교 재료공학과) ;
  • 조재우 (한국건설생활환경시험연구원 첨단건설재료센터)
  • Received : 2014.02.10
  • Accepted : 2014.03.05
  • Published : 2014.03.31
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Abstract

Due to the revised Korean standard KS L 5201 for Ordinary Portland Cement (OPC), the use of mixed cement has grown from 5% to 10%. This study investigates the hydration behavior of $C_3A$, asit is a cement mixture that is more commonly used than granulated blast furnace slag or limestone alone. Paste samples were prepared with either granulated blast furnace slag or limestone alone. Each sample was compared with the widely used Rietveld method with a cement mixture containing blast furnace slag or limestone. The hydration behavior of $C_3A$ in each OPC sample was assessed and results were analyzed. Granulated blast furnace slag promotes a high initial level of ettringite, but as the days passed, it promotes an increase in monosulfate, leading to cracks and expansion due to the penetration of sulfates in the solution. However, when limestone is added to the mixture, a transformation of ettringite to monosulfate occurs in the presence of the $CaCO_3$ in the limestone. It is considered that this produces hemi-carbonate and mono-carbonate and thus maintains the ettringite level.

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References

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