Abstract
A Class F fly ash has been analyzed using synchrotron x-ray diffraction (XKD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) to determine the composition, phase distribution, particle size, and particle morphology. XRD showed the existence of mullite, quartz, Fe 2 O 3 (hematite or maghemite), and CaSO 4 (anhydrite), with the possibility of calcium hydroxide (CH), which was also confirmed using TGA. SEM and x-ray microanalysis indicate four particle types: 1) a mixed aluminosilicate (A-S) phase with variable amounts of calcium, iron, and magnesium; 2) quartz or glassy silica; 3) FeO, Fe 2 O 3 , or an MgO-FeO phase; and 4) Ca(OH) 2 mixed with CaSO 4 . A combination of image analysis and XRD was used to identify and quantify the phase fraction of the major components in the system, including aluminosilicate glass and silica. These were used to construct segmented microstructures suitable for use in multi-scale microstructural simulations. Microanaysis also suggests that the A-S glassy portion of the ash may actually be two separately identifiable glasses or at least bounded by the compositions AS 3 and A 2 S 3 .
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