Physicochemical characterization of unconventional fly ashes

Ying Wang, B. Cansu Acarturk, Lisa Burris, R. Douglas Hooton, Christopher R. Shearer, Prannoy Suraneni

Research output: Contribution to journalArticlepeer-review


As the supply-demand disparity of virgin fly ash increases, there is an urgent need for utilization of unconventional fly ashes. This paper characterizes a set of 19 different fly ashes, including marginal, off-spec, landfilled, or beneficiated materials using extensive physicochemical powder characterization. The chemical composition, mineralogical composition, moisture content, loss on ignition, fineness, morphology, and specific gravity of the fly ashes were determined. Some fly ashes displayed unusual properties; however, many unconventional source fly ashes did not show properties substantially different from conventional fly ashes. Several interesting correlations in the measured properties were found for the fly ashes. The three measures of fineness or particle size correlated with each other. Loss on ignition values measured using a furnace and thermogravimetric analysis correlated but both temperature and atmosphere affected the measured values and the correlation. Electron microscopy provides important information regarding particle sizes, shapes, and potential contaminants for the unconventional fly ashes.

Original languageEnglish (US)
Article number123318
StatePublished - May 15 2022
Externally publishedYes


  • Chemical composition
  • Electron microscopy
  • Fineness
  • Fly ash
  • Off-spec

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry


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