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한국콘크리트학회|IJCSM 2022년 5월

논문명 Effect of Silica Fume on the Volume Expansion of Metakaolin-Based Geopolymer Considering the Silicon-to-Aluminum Molar Ratio
저자명 (Sungwoo Park) ; (Juan Yu) ; (Jae Eun Oh) ; (Sukhoon Pyo)
발행사 한국콘크리트학회
수록사항 IJCSM, Vol.16 No.3 (2022-05)
페이지 시작페이지(335) 총페이지(12)
ISSN 1976-0485
주제분류 재료 / 구조
주제어 ; volume expansion; metakaolin; geopolymer; silica fume; compressive strength
요약2 This paper investigates the effect of silica fume on the mechanical properties of metakaolin-based geopolymers with different silicon-to-aluminum molar (S/A) ratios. Geopolymer has been extensively studied as an alternative to traditional cementitious material because of its low CO2 emissions. Previous studies revealed that the application of silica fume can improve the compressive strength of geopolymer, however, the optimum dosages are different. To examine the reason for the different optimum dosages of silica fume, this study prepares geopolymer specimens of which variables are the S/A ratio and silica fume dosage, and conducts compressive strength and initial setting time tests. To examine whether the strength degradation is caused by the expansion due to the added silica fume in geopolymer, the volume and dynamic modulus are also measured. The results show that a part of silica fume dissolves and changes the S/A ratio of geopolymer, and that a part of silica fume remains in the geopolymer matrix. These combined effects of silica fume result in an irregular compressive strength trend, and, thus, an optimum dosage of silica fume can vary depending on the S/A ratio. Furthermore, the volume expansion of geopolymer with silica fume is observed, however, no sign of damage on the compressive strength is found.
소장처 한국콘크리트학회
언어 영어
DOI https://doi.org/10.1186/s40069-022-00510-2