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Effect of Alkali and Water Content on Setting Time and Strength of Fly Ash Based Geopolymer

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Abstract:

The current work presents the effect of alkali concentration and water content on fly ash based geopolymer material. In this paper geopolymer material was prepared where Si/Al ratio (1.85: 1) is fixed and solid to water ratio (S/W) and NaOH concentration (4M, 8M, 12M) were varied. All samples were tested to establish the roles of water and alkali on the setting time and strength. At low solid to water ratio, (S/W= 3:1), the water quantity is high and the hardening of gel phase take more time. However, as water content is reduced from S/W 3:1 to 4:1 ratio, the setting point decreased significantly and only small change in setting time is observed when S/W shifted from 4:1 to 5:1. Sample prepared with 8M of NaOH showed the highest compressive strength. In this regards, Fourier transform infrared spectroscopy (FTIR) results support this observation where broad band (asymmetric strectching band) become sharper and shift towards lower wavenumber (1082.36 cm-1 to 985.16 cm-1). This finding shows that, to obtain required processing time at desired mechanical strength (20-30 Mpa) for a specific application of geopolymer, the suitable amount of water must be established.

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Periodical:

Applied Mechanics and Materials (Volume 699)

Pages:

93-98

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.699.93

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Online since:

November 2014

Authors:

Afshan Asif*, Zakaria Man, Khairun Azizi Azizli, Rashidah Mohammed Hamidi

Keywords:

Compressive Strength, Fly Ash (FA), Geopolymer, Setting Time, Solid to Water Ratio

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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