Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Feasibility of Korean Rice Husk Ash as Admixture for High Strength Concrete: Particle Size Distribution, Chemical Composition and Absorption Capacity Depending on Calcination Temperature and Milling Process

고강도 콘크리트 혼화재로서 국산 왕겨재의 활용 가능성: 소성 온도와 분쇄공정 유무에 따른 입도, 성분 및 흡습 성능

  • Kwon, Yang-Hee (Department of Architecture and Architectural Engineering, Seoul National University) ;
  • Hong, Sung-Gul (Department of Architecture and Architectural Engineering, Seoul National University)
  • Received : 2017.03.09
  • Accepted : 2017.04.07
  • Published : 2017.04.30
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Abstract

This study examined the material properties of Korean rice husk ash (RHA) according to the manufacturing process, and evaluated the feasibility of its use as a new admixture for high strength concrete. For this purpose, its particle size distribution, chemical composition, and microstructure were analyzed under various parameters, such as calcination temperature ($400^{\circ}C$, $650^{\circ}C$, and $900^{\circ}C$) and the inclusion of a milling process. X-ray fluorescence analysis confirmed that the silicon oxide ($SiO_2$) content of RHA was improved to more than 92% with a calcination process at $650^{\circ}C$ or higher. In addition, microstructural analysis showed that the RHA calcined at $650^{\circ}C$ has a porous structure. Because of this, the absorption capacity of the RHA was improved. On the other hand, when the milling process was applied, the porous structure was destroyed; thus, the absorption capacity tended to decrease further. Based on the analysis results, it was concluded that RHA calcined at $650^{\circ}C$ can be used as an admixture for high strength concrete, which possesses functions of both a shrinkage reducing agent and a pozzolanic activator.

이 연구는 제조 공정에 따른 국산 왕겨재의 재료특성 변화를 조사하는 것과 고강도 콘크리트 혼화재로서의 활용 가능성을 검토하는 것을 목적으로 수행되었다. 이를 위해 왕겨재의 소성온도 ($400^{\circ}C$, $650^{\circ}C$ 그리고 $900^{\circ}C$) 및 분쇄 여부를 주요 변수로 두고 그것의 입도 분포, 구성 성분, 그리고 미세구조가 분석되었다. X-ray fluorescence (XRF)를 이용한 성분 분석 결과, $650^{\circ}C$ 이상의 고온소성 공정을 거칠 경우, 왕겨재의 산화규소($SiO_2$) 함량이 92% 이상으로 향상되는 것을 확인하였다. 또한, 주사 현미경 촬영을 통해 $650^{\circ}C$ 에서 소성된 왕겨가 다공성 구조인 것을 확인하였으며, 이 공정이 적용된 시편의 흡습성능이 모든 시편들 중 가장 우수하였다. 분쇄 공정 적용시 공극구조가 파괴되기 때문에 흡습능력은 더 감소하는 경향을 보였다. 반면, $900^{\circ}C$ 에서 소성된 시편은 공극구조가 발견되지 않았고, 흡수율 역시 가장 낮게 나타났다. 분석결과를 근거로, $650^{\circ}C$ 에서 소성된 왕겨재는 포졸란 반응 활성화제 뿐만 아니라 흡습성능에 의한 자기수축 저감제로서 고강도 콘크리트를 위한 혼화재로서 적합한 것으로 결론 내려진다.

Keywords

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