Influence of portland cement replacement in high calcium fly ash geopolymer paste

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Keywords:
Geopolymer High calcium fly ash Portland cement Compressive strength Modulus of elasticity

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Tanakorn Phoo-ngernkham
Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand,40002.
Prinya Chindaprasirt
Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand,40002.
Vanchai Sata
Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand,40002.
Sakonwan Hanjitsuwan
Program of Civil Technology, Faculty of Industrial Technology, Lampang Rajabhat University, Lampang, Thailand,52100.

Abstract

This article presents the influence of ordinary Portland cement (OPC) replacement in high calcium
fly ash (FA) geopolymer paste. FA was used to replace OPC at the rate of 5, 10 and 15% by mass of binder.
Sodium silicate (Na2SiO3) and 10 molar sodium hydroxide (NaOH) solutions were used as the alkaline
solution in the reaction. The Na2SiO3/NaOH ratio of 2.0 and the liquid/binder (L/B) ratio of 0.60 were used in
all mixtures. The results of increase OPC replacement, the setting time and compressive strain capacity
decreased while the compressive strength and modulus of elasticity increased. The compressive strength
and modulus of elasticity at 28 days of geopolymer pastes with 15% OPC replacement were 36.7 MPa and
13,300 MPa, respectively.

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How to Cite
Phoo-ngernkham, T., Chindaprasirt, P., Sata, V., & Hanjitsuwan, S. (2014). Influence of portland cement replacement in high calcium fly ash geopolymer paste. Engineering and Applied Science Research, 41(1), 19–27. Retrieved from https://ph01.tci-thaijo.org/index.php/easr/article/view/21758
Issue
Vol. 41 No. 1 (2014)
Section
ORIGINAL RESEARCH

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