Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of Limestone Powder on Hydration of C3A-CaSO4·2H2O System

C3A-CaSO4·2H2O 계의 수화반응에 미치는 석회석 미분말의 영향

  • Lee, Jong-Kyu (Green Ceramics Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Chu, Yong-Sik (Green Ceramics Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Song, Hun (Green Ceramics Division, Korea Institute of Ceramic Engineering & Technology)
  • 이종규 (한국세라믹기술원 그린세라믹본부) ;
  • 추용식 (한국세라믹기술원 그린세라믹본부) ;
  • 송훈 (한국세라믹기술원 그린세라믹본부)
  • Received : 2011.10.07
  • Accepted : 2011.11.25
  • Published : 2011.11.30
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Abstract

In this work, effects of limestone powder on hydration of $C_3A-CaSO_4{\cdot}2H_2O$ system was discussed based on the XRD Quantitative analysis, and the possibility of Delayed Ettringite Formation was also discussed. The early hydration of $C_3A$ was delayed by addition of $CaCO_3$ powder. The delay effect was enhanced by increasing of $CaCO_3$ content and finer powder of $CaCO_3$ addition. After consumption of $CaSO_4{\cdot}2H_2O$, the reaction of $CaCO_3$ is started. Delayed Ettringite Formation would take place because monosulfoaluminate is not stable in presence of $CaCO_3$. In order to prevent the delayed ettringite formation in $C_3A-CaSO_4{\cdot}2H_2O-CaCO_3$ system, the reduction of monosulfoaluminate formation is important. Therefore, by increasing the amount of $CaCO_3$ addition and finer $CaCO_3$ powder addition, the delayed ettringite formation can be prevented.

Keywords

References

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