Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Fluidity of Cement Paste with Air-Cooled Blast Furnace Slag

고로 서냉슬래그 혼합 시멘트 페이스트의 유동성

  • Lee, Seung-Heun (Department of Materials Engineering, Kunsan National University) ;
  • Park, Seol-Woo (Department of Materials Engineering, Kunsan National University) ;
  • Yoo, Dong-Woo (Department of Materials Engineering, Kunsan National University) ;
  • Kim, Dong-Hyun (Environmental Affairs Group, Environment & Energy Planning Department, POSCO)
  • 이승헌 (군산대학교 신소재공학과) ;
  • 박설우 (군산대학교 신소재공학과) ;
  • 유동우 (군산대학교 신소재공학과) ;
  • 김동현 (포스코 환경에너지기획실 부산물 자원그룹)
  • Received : 2014.08.16
  • Accepted : 2014.09.16
  • Published : 2014.11.30
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Abstract

Air-cooled slag showed grindability approximately twice as good as that of water-cooled slag. While the studied water-cooled slag was composed of glass as constituent mineral, the air-cooled slag was mainly composed of melilite. It is assumed that the sulfur in air-cooled slag is mainly in the form of CaS, which is oxidized into $CaS_2O_3$ when in contact with air. $CaS_2O_3$, then, is released mainly as $S_2O{_3}^{2-}$ion when in contact with water. However, the sulfur in water-cooled slag functioned as a constituent of the glass structure, so the$S_2O{_3}^{2-}$ ion was not released even when in contact with water. When no chemical admixture was added, the blended cement of air-cooled slag showed higher fluidity and retention effect than those of the blended cement of the water-cooled slag. It seems that these discrepancies are caused by the initial hydration inhibition effect of cement by the $S_2O{_3}^{2-}$ ion of air-cooled slag. When a superplasticizer is added, the air-cooled slag used more superplasticizer than did the blast furnace slag for the same flow because the air-cooled slag had higher specific surface area due to the presence of micro-pores. Meanwhile, the blended cement of the air-cooled slag showed a greater fluidity retention effect than that of the blended cement of the water-cooled slag. This may be a combined effect of the increased use of superplasticizer and the presence of released $S_2O{_3}^{2-}$ ion; however, further, more detailed studies will need to be conducted.

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References

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