서천화력발전소 매립 석탄재로부터 제조한 다양한 조성비의 지오폴리머와 그 특성의 평가 |
이수정, 주형태1, 전철민2, 강남희, 조성백 |
한국지질자원연구원 광물자원연구본부 1한국해양과학기술원 해양방위센터 2한국지질자원연구원 지구환경연구본부 |
Developing and Assessing Geopolymers from Seochun Pond Ash with a Range of Compositional Ratios |
Sujeong Lee, Hyeong-Tae Jou1, Chul-Min Chon2, Nam-Hee Kang, Sung-Baek Cho |
Mineral Resources Research Division, Korea Institue of Geoscience and Mineral Resources 1Maritime Security Center, Korea Institute of Ocean Science & Technology 2Geologic Environment Division, Korea Institue of Geoscience and Mineral Resources |
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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. |
Key words:
Geopolymer, Pond ash, Compositional ratios, Compressive strength |
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