Thermal character of geopolymers synthesized from class f fly ash containing high concentrations of iron and α-quartz.

Rickard, WDA; van Riessen, A; Walls, P

Thermal character of geopolymers synthesized from class f fly ash containing high concentrations of iron and α-quartz.

Date

2010-01

Authors

Rickard, WDA

van Riessen, A

Walls, P

Publisher

Wiley-Blackwell

Abstract

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. © 2010, Wiley-Blackwell.

Keywords

Fly ash, Quartz, Iron oxides, Thermal expansion, Polymers, Morphology

Citation

Rickard, W. D. A., van Riessen, A., & Walls, P. (2010). Thermal character of geopolymers synthesized from class f fly ash containing high concentrations of iron and α-quartz. International Journal of Applied Ceramic Technology, 7(1), 81-88. doi:10.1111/j.1744-7402.2008.02328.x