Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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A Study on the Phase Change and Microstructure Change According to the Sintering Temperature of Cement Clinker Applied with Coal Ash

석탄재를 적용한 시멘트 클링커의 소성온도에 따른 상변화 및 미세구조 변화 고찰

  • Yoo, Dong-Woo (Department of Materials Science & Engieering, Kunsan National University) ;
  • Im, Young-Jin (Construction Materials R&D Corporation) ;
  • Choi, Sang-Min (Department of Materials Science & Engieering, Kunsan National University) ;
  • Lee, Chang-Hyun (Manufacturing Technology, Sampyo Cement)
  • 유동우 (군산대학교 신소재공학과) ;
  • 임영진 (건설소재 알앤디(주)) ;
  • 최상민 (군산대학교 신소재공학과) ;
  • 이창현 ((주)삼표시멘트 생산기술)
  • Received : 2021.10.28
  • Accepted : 2021.11.09
  • Published : 2021.12.30
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Abstract

In this study, cement clinker using a pure sample and clinker using 7% coal ash were sintered at a temperature of 1050~1500℃. Changes in the content of cement minerals and changes in microstructure by sintering temperature were reviewed. The application of coal ash as a raw material for cement clinker was applicable as a source of Al2O3 and SiO2. At a sintering temperature of 1350℃ or higher, the cement clinker applied with coal ash showed the same level of mineral content as compared to the cement clinker applied with pure raw material. The microstructure also showed a similar state, confirming that coal ash can be used as a raw material for cement. In XRD-Reitveld analysis, a maximum amount of Belite was produced at 1250℃. The conversion from Belite to Alite was observed from 1350℃. From 1350℃, the interstitial phase and the mineral phase presumed to be alite were distinguished. It was clearly distinguished from 1400℃. As the sintering temperature increased, the shape and boundary of the crystal phase became clear, and the size of the crystal phase was also increased.

본 연구에서는 순수시료를 사용한 시멘트 클링커와 석탄재를 7% 적용한 클링커를 1050~1500℃의 온도로 소성하여 소성온도별 시멘트 광물의 함량 변화와 미세구조의 변화를 검토하였다. 시멘트 클링커의 원료로서 석탄재의 적용은 알루미나 및 규산질의 공급원으로 적용이 가능하였으며, 석탄재를 적용한 시멘트 클링커는 1350℃ 이상의 소성온도에서 순수원료를 적용한 시멘트 클링커와 동등 수준의 광물량을 나타내었고, 미세구조 또한 유사한 상태를 나타내어 시멘트 원료로서 석탄재의 활용이 가능함을 확인하였다. XRD-Reitveld 분석에서 1250℃에서 Belite의 최대량이 생성되어 1350℃에서부터 Belite에서 Alite로의 전환이 나타났다. 1350℃에서부터 간극상과 Alite로 추정되는 광물상이 구분되며, 1400℃에서부터 명확하게 구분되었다. 소성온도가 증가함에 따라 결정상의 형상과 경계가 명확해지며, 결정상의 크기도 증가되는 것이 나타났다.

Keywords

Acknowledgement

본 연구는 2020년도 산업통상자원부 및 산업기술평가원(KEIT)의 연구비 지원으로 수행되었습니다. 이에 감사드립니다.

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