Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Review: Utilization of Coal Bottom Ash for Concrete and Mortar

총설: 콘크리트 및 모르타르를 위한 석탄 바텀애시의 활용

  • Kim, Hyeong-Ki (Department of Architectural Engineering, Chosun University)
  • 김형기 (조선대학교 건축공학과)
  • Received : 2020.08.13
  • Accepted : 2020.09.23
  • Published : 2020.09.30
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Abstract

The present review dealt with the state-of-art on utilization of coal bottom ash in cement-based concrete and mortar. Two types of bottom ashes generated from pulverized coal combustion and circulating fluidized-bed combustion systems have been considered. The production process, chemical and physical characteristics of both ashes, and the methodology of utilization in various cement composites are summarized. The effect of bottom ash on various properties of concrete, such as workability, strength, and durability, were reviewed from the literature. In addition, the environmental and economic aspects of utilizing bottom ash in concrete are analyzed to explore the perspectives of bottom ash utilization, and through this, the future of the utilization was considered. The effect of bottom ash on the performance of concrete and mortar was greatly depended on the condition, pretreatment, and processing of the ash. Additional processing such as crushing might contribute to stimulating the utilization in this field. In particular, if economic support is possible in terms of policy, utilization rate is expected to be improved.

본 총설에서는 석탄 바텀애시의 콘크리트 활용에 대한 최신의 전반적 내용을 다룬다. 최근 사용되는 두 종류의 화력발전시스템, 즉 미분탄연소와 순환유동층연소 보일러 각각으로부터 배출되는 바텀애시의 생산 과정과 물리적, 화학적 특성에 대해 분석하고, 활용 방법 및 활용을 위한 전처리 혹은 활용 대상 콘크리트의 종류에 대해 정리 하였다. 또한 바텀애시가 콘크리트의 여러 특성, 즉 유동성, 강도, 내구성에 미치는 영향에 대해 알아보았다. 그리고 바텀애시를 혼입한 콘크리트의 환경성 및 경제성에 대해 분석하였으며, 이를 통해 바텀애시의 콘크리트 내 활용의 미래를 고찰해 보았다. 바텀애시가 콘크리트 및 모르타르의 성능에 미치는 영향은 그 자체의 성능 외에도 전처리 및 가공 여부에 의해 크게 영향을 받는다. 따라서, 이 분야의 활용을 늘리기 위해서는 기술적 측면에서 분쇄 등의 약간의 물리적 가공이 필요하며, 이와 관련된 시방 및 기준의 정비가 요구된다는 것을 확인하였다. 특히 정책적 측면에서의 경제적 지원이 가능하다면 바텀애시 활용을 크게 확대할 수 있을 것으로 예상된다.

Keywords

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