Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Developing and Assessing Geopolymers from Seochun Pond Ash with a Range of Compositional Ratios

서천화력발전소 매립 석탄재로부터 제조한 다양한 조성비의 지오폴리머와 그 특성의 평가

  • Lee, Sujeong (Mineral Resources Research Division, Korea Institue of Geoscience and Mineral Resources) ;
  • Jou, Hyeong-Tae (Maritime Security Center, Korea Institute of Ocean Science & Technology) ;
  • Chon, Chul-Min (Geologic Environment Division, Korea Institue of Geoscience and Mineral Resources) ;
  • Kang, Nam-Hee (Mineral Resources Research Division, Korea Institue of Geoscience and Mineral Resources) ;
  • Cho, Sung-Baek (Mineral Resources Research Division, Korea Institue of Geoscience and Mineral Resources)
  • 이수정 (한국지질자원연구원 광물자원연구본부) ;
  • 주형태 (한국해양과학기술원 해양방위센터) ;
  • 전철민 (한국지질자원연구원 지구환경연구본부) ;
  • 강남희 (한국지질자원연구원 광물자원연구본부) ;
  • 조성백 (한국지질자원연구원 광물자원연구본부)
  • Received : 2013.01.29
  • Accepted : 2013.03.13
  • Published : 2013.03.31
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Abstract

Pond ash produced from Seochun Power Station was quantitatively characterized to manufacture geopolymers with a range of Si/Al compositional ratios. Mix consistency was kept nearly constant for comparing the compressive strengths of geopolymers. The amorphous composition of coal ash was determined using XRF and quantitative X-ray diffraction. Different mix compositions were used in order to achieve Si/Al ratios of 2.0, 2.5 and 3.0 in the geopolymer binder. Geopolymers synthesized from coal ash with a Si/Al ratio of 3.0 exhibited the highest compressive strength in this study. It was found that geopolymers activated with aluminate produced different microstructure from that of geopolymers activated with silicate. High silica in alkali activators produced the fine-grained microstructure of geopolymer gel. It was also found that high compressive strength was related to low porosity and a dense, connected microstructure. The outcome of the reported experiment indicates that quantitative formulation method made it possible to choose suitable activators for achieving targeted compositions of geopolymers and to avoid efflorescence.

Keywords

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