Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Physical Properties of Cement Using Slag as Raw Mix of Clinker

슬래그를 클링커 혼합원료로 사용한 시멘트의 물리적 특성

  • Young-Jun Lee (Korea Institute of Ceramic Engineering and Technology) ;
  • Do-young Kwon (Korea Institute of Ceramic Engineering and Technology) ;
  • Bilguun Mend (Korea Institute of Ceramic Engineering and Technology) ;
  • Yong-Sik Chu (Korea Institute of Ceramic Engineering and Technology)
  • 이영준 (한국세라믹기술원 탄소중립소재센터 ) ;
  • 권도영 (한국세라믹기술원 탄소중립소재센터 ) ;
  • ;
  • 추용식 (한국세라믹기술원 탄소중립소재센터 )
  • Received : 2024.04.26
  • Accepted : 2024.05.23
  • Published : 2024.06.30
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Abstract

The global cement industry emits approximately 2.9 billion tons of greenhouse gases, of which 1.74-1.89 billion tons are emitted from limestone, which is the main raw material for clinkers. Therefore, the feasibility of using slag, a non-carbonated CaO-based raw material, must be investigated, and the physical properties of cement must be considered. In this study, the mixing ratios of the raw mix and properties of cement were analyzed. The CaCO3 replacement ratio was limited when one type of slag was used; however, when the mixed slag was utilized, the CaCO3 replacement ratio increased by more than 12 %. The compressive strength of the slag-incorporated cement was lower than that of Ordinary Portland Cement (OPC). Therefore, the lime saturation factor (LSF) of the raw mix and fineness of the cement were increased to improve the compressive strength. The compressive strength of cement with improved fineness was similar to that of OPC for a CaCO3 replacement ratio of up to 6 %, and it decreased as the CaCO3 replacement ratio was increased to 9 %. When both fineness and LSF were increased, the compressive strength and flow value of the cement with a CaCO3 replacement ratio of 12 % were similar to that of OPC.

세계 시멘트 산업의 온실가스 배출량은 약 29억 톤이며, 이중 17.4~18.9억 톤이 시멘트 클링커의 주원료인 석회석으로부터 배출된다. 따라서 비탄산 CaO 원료인 슬래그류 사용이 연구되어야 하며, 이때 시멘트의 물리적 특성도 충분히 발현되어야 한다. 본 연구에서는 슬래그류 사용에 따른 혼합원료 배합 조건과 시멘트 물성을 분석하였다. 슬래그류 단독 사용 시 CaCO3 대체율은 한계를 갖으나, 혼합 슬래그 사용 시 CaCO3 대체율이 12 % 이상 증가하였다. 단독 슬래그 사용 시멘트의 압축강도는 OPC 대비 감소하였으며, 압축강도 증진을 위해 혼합원료의 LSF 및 시멘트 분말도를 상향시켰다. 분말도 상향 시멘트의 압축강도는 CaCO33 대체율 6 %까지 OPC와 유사하였으나, 9 % 이상에서는 소폭 하락하였다. 하지만 혼합 슬래그 사용 시멘트의 분말도와 LSF를 모두 상향 시, CaCO3 대체율 12 % 시멘트도 OPC와 유사한 압축강도가 발현되었다. 또한 CaCO3 대체율 12 % 시멘트의 플로우 값도 OPC와 유사하였다.

Keywords

Acknowledgement

이 연구는 2024년도 산업통상자원부 및 산업기술기획평가원(KEIT) 연구비 지원에 의한 연구임(RS-2022-00154993).

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