SYMPOSIA PAPER Published: 23 March 2019
STP161320180250

Characterization of Fly Ashes by a Novel Method in the Scanning Electron Microscope

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In this paper, we show a new technique to characterize fly ashes using scanning electron microscopy (SEM). Chemical composition of millions of points is measured by SEM–energy dispersive X-ray spectroscopy and plotted in a ternary frequency plot. This new and straightforward way of displaying microscope data makes it easy to understand and assess the number, the approximate chemical composition, and the relative proportions of populations that constitute the fly ash. For quantitative characterization of the raw fly ash, these populations are grouped as predominantly silicate, calcium-silicate, aluminosilicate, and calcium-rich aluminosilicate. The same technique is then used to track these anhydrous fly ash fractions in blended cements during hydration and thus provide crucial information on the reactivity of different glasses in cementitious systems.

Author Information

Durdziński, Paweł, T.
HTC Global RnD, HeidelbergCement AG, Leimen, DE Laboratory of Construction Materials, Lausanne, CH
Dunant, Cyrille, F.
Laboratory of Construction Materials, Lausanne, CH
Haha, Ben, Mohsen
HTC Global RnD, HeidelbergCement AG, Leimen, DE
Scrivener, Karen, L.
Laboratory of Construction Materials, Lausanne, CH
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Details
Developed by Committee: C01
Pages: 55–64
DOI: 10.1520/STP161320180250
ISBN-EB: 978-0-8031-7672-0
ISBN-13: 978-0-8031-7671-3