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Magnetic Properties of Low-Ca Fly Ash: A Rapid Tool for Fe-Assessment and a Survey for Potentially Hazardous Elements

Published online by Cambridge University Press:  15 February 2011

M.J. Dekkers  and
H.S. Pietersen
M.J. Dekkers
Affiliation:
Paleomagnetic Laboratory ‘Fort Hoofddijk’, Institute for Earth Sciences, University of Utrecht, Budapestlaan 17, 3584 CD Utrecht, The Netherlands
H.S. Pietersen
Affiliation:
Delft Technical University, Faculty of Civil Engineering, Department of Mechanics and Constructions, Section Materials Science, Stevinweg 1, P.O. Box 5048, 2628 CN Delft, The Netherlands
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Abstract

Between 20 and 50 per cent of the total iron in low-Ca fly ashes resides in low-substitution magnetite spinel with Curie temperatures in between 565 and 590°C. A TEM study reveals that the spinel consists of aggregates of closely spaced spherules of 10 – 30 nm in diameter, which is in complete agreement with rock magnetic determinations. The low-field magnetic susceptibility correlates extremely well with total iron and fairly well with specific heavy metals. Measurement of the magnetic susceptibility may serve as a rapid tool for the evaluation of the speciation of these heavy metals in fly ash.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 245: Symposium K – Advanced Cementitious Systems: Mechanisms and Properties , 1991 , 37
Copyright
Copyright © Materials Research Society 1992

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References

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