Journal
MATERIALS & DESIGN
Volume 55, Issue -, Pages 58-65Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2013.09.049
Keywords
Geopolymer; Nano-SiO2; Nano-Al2O3; Compressive strength; Flexural strength; Shear bond strength
Categories
Funding
- Higher Education Research Promotion
- National Research University Project of Thailand, Office of the Higher Education Commission, through the Advanced Functional Materials Cluster of Khon Kaen University
- Thailand Research Fund (TRF) under the TRF [RTA5480004]
- TRF
- Khon Kaen University under the TRF-Royal Golden Jubilee Ph.D. program [PHD/0340/2552]
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This article presents the effect of adding nano-SiO2 and nano-Al2O3 on the properties of high calcium fly ash geopolymer pastes. Nano-particles were added to fly ash at the dosages of 0%, 1%, 2%, and 3% by weight. The sodium hydroxide concentration of 10 molars, sodium silicate to sodium hydroxide weight ratio of 2.0, the alkaline liquid/binder ratio of 0.60 and curing at ambient temperature of 23 degrees C were used in all mixtures. The results showed that the use of nano-SiO2 as additive to fly ash results in the decrease of the setting time, while the addition of nano-Al2O3 results in only a slight reduction in setting time. Adding 1-2% nano-particles could improve compressive strength, flexural strength, and elastic modulus of pastes due to the formation of additional calcium silicate hydrate (CSH) or calcium aluminosilicate hydrate (CASH) and sodium aluminosilicate hydrate (NASH) or geopolymer gel in geopolymer matrix. In addition, the additions of both nano-SiO2 and nano-Al2O3 enhances the shear bond strength between concrete substrate and geopolymer. (C) 2013 Elsevier Ltd. All rights reserved.
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