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Fly Ash Cement: Production Methods, Materials Properties and Energy Savings

Published online by Cambridge University Press:  25 February 2011

Erik Stoltenberg-Hansson*
Affiliation:
Norcem Cement A/S, N-3950 Brevik, Norway
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Abstract

A standard system for grinding of Portland clinker to cement and the different principles for producing fly ash cement is described. The quality is influenced by the grinding system selected. The preferred system for intergrinding of fly ash and clinker involves introduction of fly ash into the finishing compartment of the mill. Efforts made to relate cement quality to specifications are described. Much attention is put on the physical characteristics of the fly ash: bulk weight, specific weight, particle distribution, particle shape, degree of agglomeration and colour. Surface areas and pozzolanic activity matter, but the air void content, which is much affected by grinding, is more important. This observation is based on testing of fly ashes and fly ash cements from production and laboratory grindings. The testing includes compressive strength, specific gravity, laser granulometry and SEM. The results have led to the introduction of new analytical and control procedures. A review of fly ash quality factors of most importance for cement producers is given. The energy balance in the production of blended fly ash cement involves savings from reduced consumption of clinker, and expenditure on transport, handling of fly ash and extra grinding of clinker and fly ash; net savings may be considerable.

Type
Articles
Copyright
Copyright © Materials Research Society 1986

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References

1. Stoltenberg-Hansson, E. and Soepler, B., Zement-Kalk-Gips, 35, 625633 (1982).Google Scholar
2. Heilesen, S.N., in Proceedings 20th International Rock Products Cement Seminar, December 1984, p. 68.Google Scholar
3. Soltenberg-Hansson, E., Rock Products, 4, 87 (1985).Google Scholar
4. Stoltenberg-Hansson, E., Zement-Kalk-Gips, 38, 609 (1985).Google Scholar
5. Jensen, S.A., in Fly Ash and Coal Conversion By-Products - Characterization. Utilization and Disposal II,” edited by McCarthy, G.J., Glasser, F.P. and Roy, D.M. (Materials Research Society, Pittsburgh, 1986) (this volume).Google Scholar
6. Richartz, W., Zement-Kalk-Gips, 37, 6271 (1984).Google Scholar
7. Osbaeck, B., Cem. Concr. Res., 15, 5364 (1985).Google Scholar
8. Meland, I., (unpublished work for Norcem Cement A/S).Google Scholar
9. Norwegian and Standard/Norsk Standard, NS 3098. Portland cements. Specifications of properties, sampling and delivery. Norges Standardiseringsforbund. May 1983.Google Scholar
10. Norwegian Standard/Norsk Standard, NS 3049. Norges Standardiseringsforbund, January 1970.Google Scholar