Setting Time, Strength, and Bond of High-Calcium Fly Ash Geopolymer Concrete
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 7
Abstract
In this paper, setting time, strength and bond of high-calcium fly ash geopolymer concrete were investigated. The high-calcium fly ash was from Mae Moh power plant in northern Thailand. Both sodium silicate solution and sodium hydroxide solution were used as alkali activators in every mix. Sodium hydroxide solution with 10 M, 15 M, and 20 M concentrations, sodium silicate to sodium hydroxide ratios of 1.0 and 2.0, alkaline liquid to fly ash ratio of 0.5 and two curing regimes viz., heat curing at for 24 h and room temperature curing at were used. The results indicated that fresh geopolymer concrete had short setting time of 28–58 min due to the presence of high calcium content of fly ash. In general, strengths and modulus of elasticity increased with the increase in NaOH concentration. For compressive strength, the optimum content was around 12% of fly ash. The high-strength geopolymer concrete with 28-day compressive strength of 54.4 MPa was obtained for mix with 15M NaOH. The modulii of elasticity of geopolymer concrete were related to the compressive strengths and comparable to those of portland cement concrete. The tensile splitting strength and bond strength were also related to the compressive strength and the values were higher than those of portland cement concrete. In particular, the bond strengths were significantly higher than those given by the current design code.
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Acknowledgments
This work was financially supported by the Thailand Research Fund (TRF) under the TRF Senior Research Scholar, Grant No. RTA5480004. It was also supported by the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission, through the Advanced Functional Materials Cluster of Khon Kaen University AFM-2554-Ph.D. 54402.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 7 • July 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 6, 2014
Accepted: Jul 1, 2014
Published online: Aug 19, 2014
Discussion open until: Jan 19, 2015
Published in print: Jul 1, 2015
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