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The Microstructure of National Bureau of Standards Reference Fly Ashes

Published online by Cambridge University Press:  21 February 2011

J. C. Qian ,
E. E. Lachowski  and
F. P. Glasser
J. C. Qian
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen, AB9 2UE, Scotland.
E. E. Lachowski
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen, AB9 2UE, Scotland.
F. P. Glasser
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen, AB9 2UE, Scotland.
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Abstract

A suite of three fly ashes, National Bureau of Standards* Standard Reference Materials (SRMs) 2689, 2690 and 2691, was studied by transmission electron microscopy and by analytical electron microscopy (aem): sample preparation techniques are described. The chemical compositions of the glassy phase, analyzed by aem, showed a wide dispersion of values although the mean composition of the glass remained close to that of the whole fly ash.

The microstructure of these materials is complex: besides crystalline inclusions, the aluminasilica glasses have undergone phase separation on a nanometer scale, and consist of two glassy phases. Since liquid-liquid phase separation has also been found in British fly ashes, it appears to be a characteristic feature of the glassy phase in Class F ashes and is also encountered in occasional Al-Si rich particles in Class C ashes. High iron content glass was found in fly ash SRM 2689, and its phase separation and crystallization were investigated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 136: Symposium O – Fly Ash and Coal Conversion By-Products V , 1988 , 77
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

1. Hemmings, R.T. and Berry, E.E., in Fly Ash and Coal Conversion By-Products: Characterization. Utilization and Disposal IV, edited by McCarthy, G.J., Glasser, F.P., Roy, D.M. and Hemmings, R.T., Mat. Res. Soc. Symp. Proc. Vol.113 (Materials Research Society, Pittsburgh, 1988), pp. 3–38.Google Scholar
2. Qian, J.C. and Glasser, F.P., Fly Ash and Coal Conversion By-Products: Characterization. Utilization and Disposal IV pp. 39–41.Google Scholar
3. Qian, J.C., Lachowski, E.E. and Glasser, F.P., Fly Ash and Coal Conversion By-Products: Characterization. Utilization and Disposal IV pp. 45–53.Google Scholar
4. Jantzen, C.M. and Herman, H., Jour. Amer. Ceram. Soc. 62, 212 (1979).CrossRefGoogle Scholar
5. Risbud, S.H. and Pask, J.A., Jour. Amer. Ceram. Soc. 61, 63 (1978).Google Scholar
6. U.S. National Bureau of Standards Certificate of Analysis; Standard Reference Materials 2689, 2690 and 2691 Coal Fly Ash (SRM 2689, 2690 and 2691) (1986).Google Scholar
7. McCarthy, G.J. and Johanson, D.M., X-ray Powder Diffraction Study of NBS Fly Ash Standard Reference Materials, Powder Diffraction, to be published.Google Scholar
8. Roedder, E., Amer. Mineralogist. 36, 282 (1951).Google Scholar
9. Roedder, E., Amer. J. Sci. Bowen Volume, 435 (1952).Google Scholar
10. Hemmings, R.T. and Berry, E.E.: op. cit. p. 36.Google Scholar