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Thermal Character of Geopolymers Synthesized from Class F Fly Ash Containing High Concentrations of Iron and α‐Quartz
Author(s) -
Rickard William D. A.,
Riessen Arie van,
Walls Philip
Publication year - 2010
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2008.02328.x
Subject(s) - materials science , fly ash , quartz , geopolymer , thermal expansion , iron oxide , oxide , thermal , chemical engineering , composite material , mineralogy , metallurgy , chemistry , physics , meteorology , engineering
This article reports the thermal characteristics of geopolymers prepared with a class F fly ash containing 15 wt% iron oxide and 20 wt%α‐quartz. The characterization techniques used included dilatometry, TGA, DTA, XRD, and SEM. Geopolymer specimens were prepared with nominal ratios of Si:Al=2.3 and Na:Al=0.85. Iron oxide in the fly ash precursor was found to play a critical role in the thermal expansion and morphology of geopolymers at temperatures >500°C. Volume changes of quartz on either side of the α–β phase transition cause only minor variations in thermal expansion.