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Title: Alteration in the microstructure of fly ash geopolymer upon exposure to elevated temperatures
Authors: Omar A., Abdulkareem
Mohd Mustafa Al-Bakri, Abdullah
Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.
Khairul Nizar, Ismail, Assoc. Prof. Dr.
???metadata.dc.contributor.url???: eng.omar83@yahoo.com
Keywords: Elevated temperatures;Geopolymer;SEM;Strength loss;Thermal shrinkage
Issue Date: 2013
Publisher: Trans Tech Publications
Citation: Advanced Materials Research, vol. 795, 2013, pages 201-205
Abstract: This paper represents the mechanical and microstructure changes in geopolymeric material synthesized by the alkali activation of locally source fly ash at high temperatures of 400, 600 and 800 °C. The high compressive strength of geopolymer cured at 70 °C underwent thermal shrinkage and substantial strength losing at temperatures of 400, 600 °C caused by the high dehydration of the structural water. Exposure to temperature of 800 °C, the geopolymer lost its strength due to extremely densification and expansion processes of the high unreacted silicate phase in the structure. The SEM results showed that the high activator content generated large quantities of unreacted silicate crystals at high temperatures which sintered at range of temperatures of 700-800 °C causing system failure.
Description: Link to publisher's homepage at http://www.ttp.net/
URI: http://www.scientific.net/AMR.795.201
ISBN: 978-303785811-0
ISSN: 1022-6680
Appears in Collections:Mohd Mustafa Al Bakri Abdullah,Assoc. Prof. Dr.
School of Environmental Engineering (Articles)
Kamarudin Hussin, Brig. Jen. Datuk Prof. Dr.
School of Materials Engineering (Articles)

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