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Characterization of Fly Ash Reactivity by Isothermal Conduction Calorimetry

Published online by Cambridge University Press:  21 February 2011

David J. Cook ,
H. Trinh Cao  and
Daksh Baweja
David J. Cook
Affiliation:
National Building Technology Centre, P.O. Box 30, Chatswood, N.S.W., 2067
H. Trinh Cao
Affiliation:
National Building Technology Centre, P.O. Box 30, Chatswood, N.S.W., 2067
Daksh Baweja
Affiliation:
National Building Technology Centre, P.O. Box 30, Chatswood, N.S.W., 2067
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Summary

The reactivity of fly ash is generally difficult to determine because neither a single physical nor chemical property nor any combination of these can be used characterize a particular sample completely. A direct reflection of this is the range of pozzolanicity tests proposed by standards worldwide and the applicability and relevance of such tests is currently being debated.

In many countries, codes of practice and standards relating to fly ashes are currently under review. Some work has been carried out in countries including Australia, United Kingdom, and the United States on commercial fly ashes with a view to possible classification and implementation into standards [1-2]. It is generally recognized that current standards on fly ash do have some inadequacies with regard to performance prediction when included in concrete. Fineness requirements for fly ash for use in structural concrete (BS3892: Part 1) in the United Kingdom are currently being debated [2] with many workers suggesting that it would be possible to produce durable concrete with ashes which would not comply with the requirements of the standard [3].

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 113: Symposium Q – Fly Ash and Coal Conversion By-Products IV , 1987 , 129
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

1. Roper, H., Baweja, D. and Kirkby, G.A., in Second International Conference on Ash Technologv and Marketing (Central Electricity Generating Board, London, U.K., 1984) pp. 59–65.Google Scholar
2. Cabrera, J.G., Hopkins, C.J., Wooley, G.R., Lee, R.E., Shaw, J., Plowman, C. and Fox, H., in Second International Conference on the use of Fly Ash. Silica Fume. Slag and Natural Pozzolans in Concrete (CANMET/ACI, SP 91–5, Madrid Spain, 1986) pp. 115–144.Google Scholar
3. Dhir, R.K., in Concrete Technology and Design-Volume 3-Cement Replacement Materials (Swamy, R.N., Editor, Surrey University Press, U.K., 1986) pp. 197–255.Google Scholar
4. Helmuth, R., Fly Ash in Cement and Concrete, Portland Cement Association, 1987, Chapter 8, pp. 101–124.Google Scholar