Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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A Effect of Chemical Composition and Replacement Ratio of Limestone Admixture on Initial Cement Characteristics

석회석 혼합재의 화학성분과 치환량이 시멘트 초기 물성에 미치는 영향

  • 서동균 (아세아시멘트 탄소중립연구실) ;
  • 김규용 (충남대학교 건축공학과) ;
  • 최재원 (아세아시멘트 탄소중립연구실) ;
  • 김경석 (아세아시멘트 탄소중립연구실) ;
  • 우지완 (아세아시멘트 탄소중립연구실)
  • Received : 2023.11.06
  • Accepted : 2023.11.21
  • Published : 2023.12.30
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Abstract

Utilizing admixture, which is one of the raw material replacement method in the cement industry, is expected to be easily and quickly put to practical use as it is relatively more accessible than other methods. Among cement admixtures, limestone powder is reported to be able to improve cement performance through nucleation effects, chemical effects, and filler effects, so it is a material expected to be suitable as a cement admixture. Meanwhile, as high-quality limestone is depleted around the world, the use of limestone with clay or high magnesia (MgO) content is becoming increasingly inevitable. Therefore, in this study, we attempted to evaluate the suitability of limestone cement as a admixture by measuring the basic properties of limestone cement mixed with limestone of different qualities commonly used in Korea. As a result, the effect of alite reaction promotion was confirmed regardless of the chemical composition of the limestone binder. However, the dilution effect depending on the substitution amount was greater than the chemical composition. It is believed that normal-grade limestone can be used as a mixture as long as the limestone content in cement is within 15 % in this scope of study. In the future, we plan to evaluate the impact of the chemical composition of the limestone mixture through additional experiments depending on the chemical composition of cement.

시멘트 산업의 원료대체 기술의 하나인 혼합재 활용 기술은 다른 기술에 비해 접근성이 상대적으로 좋아 쉽고 빠르게 실적용이 가능할 것으로 기대된다. 시멘트 혼합재 중 석회석 분말은 핵형성효과, 화학적효과, 충전효과를 통해 시멘트 성능을 향상시킬 수 있다고 보고하고 있어 시멘트 혼합재로써 적합성이 기대되는 재료이다. 한편, 전 세계적으로 양질의 석회석이 고갈되면서 점토질 또는 마그네시아(MgO) 함량이 높은 석회석의 사용이 점차 불가피해지는 상황이다. 따라서 본 연구에서는 국내에서 흔히 사용되는 서로 다른 품질의 석회석을 혼합한 석회석 시멘트의 기초 물성을 측정하여 혼합재로서의 적합성을 평가하고자 하였다. 결과적으로 석회석 혼합재 화학성분과 상관없이 알라이트 반응촉진 효과를 확인할 수 있었다. 하지만 화학성분보다 치환량에 따른 희석효과가 크게 나타났다. 본 연구범위 내에서 석회석의 함량이 15 % 이내의 범위에서 중품위의 석회석도 혼합재로 사용할 수 있을 것으로 판단된다. 추후 시멘트 화학성분에 따른 추가적인 실험을 통하여 석회석 혼합재의 화학성분이 미치는 영향을 평가할 예정이다,

Keywords

Acknowledgement

본 연구는 2023년도 산업통상자원부 및 한국산업기술기획평가원(KEIT)의 연구비 지원에 의해 수행되었습니다.(과제번호 : 20018330)

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