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Effect of Silica Fume on the Volume Expansion of Metakaolin-Based Geopolymer Considering the Silicon-to-Aluminum Molar Ratio
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Type
Academic journal
Author
Sungwoo Park (Ulsan National Institute of Sciences and Technology) Juan Yu (Ulsan National Institute of Sciences and Technology) Jae Eun Oh (Ulsan National Institute of Sciences and Technology) Sukhoon Pyo (Ulsan National Institute of Sciences and Technology)
Journal
Korea Concrete Institute International Journal of Concrete Structures and Materials Vol.16 No.3 KCI Accredited Journals SCIE
Published
2022.5
Pages
335 - 346 (12page)

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Effect of Silica Fume on the Volume Expansion of Metakaolin-Based Geopolymer Considering the Silicon-to-Aluminum Molar Ratio
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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.
#volume expansion #metakaolin #geopolymer #silica fume #compressive strength

Contents

Abstract
1. Introduction
2. Experimental Details
3. Results
4. Discussions
5. Concluding Remarks
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