Effects of Nano-SiO2 on Setting Time and Compressive Strength of Alkaliactivated Metakaolin-based Geopolymer

Kang Gao1, Kae-Long Lin*, 2, DeYing Wang1, Hau-Shing Shiu2, Chao-Lung Hwang3, Ta-Wui Cheng4
1 Department of Environmental and Material Engineering, Yan-Tai University, China
2 Department of Environmental Engineering, National Ilan University, Ilan 26047,Taiwan
3 Department of Construction Engineering, National Taiwan University of Science and Technology, Taiwan
4 Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taiwan

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© 2013 Gao et al;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Environmental Engineering, National Ilan University, Ilan 26047,Taiwan; Tel: (886) 3-9357400; Ext 7579; Fax: (886) 3-9364277; E-mail:


This study presents a discussion on the effects of different solid-to-liquid (S/L) ratios (0.97 to 1.19) and nano- SiO2 (NS) percentages (0% to 3%) on some properties of metakaolin (MK)-based geopolymers. The setting time and compressive strength were investigated. Mercury intrusion porosimetry, fourier transform infrared spectroscopy, and scanning electron microscopy were used to determine the microstructure of the samples. The results show that a MKbased geopolymer sample added 1% NS with the S/L ratio of 1.03 exhibits more strength and less porosity. Applying NS to the geopolymer enhances compactness and increases strength. Therefore, nanotechnology can be used to improve geopolymers.

Keywords: Geopolymer, metakaolin, nano-SiO2.