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Monitoring of Fluctuations in the Physical Properties of a Class C Fly Ash

Published online by Cambridge University Press:  25 February 2011

Scott Schlorholtz ,
Ken Bergeson  and
Turgut Demirel
Scott Schlorholtz
Affiliation:
Department of Civil Engineering, Iowa State University, Ames, IA, 50011
Ken Bergeson
Affiliation:
Department of Civil Engineering, Iowa State University, Ames, IA, 50011
Turgut Demirel
Affiliation:
Department of Civil Engineering, Iowa State University, Ames, IA, 50011
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Abstract

The “quality” of fly ash produced during 1985 at Ottumwa Generation Station, was evaluated by two different experimental programs. The first consisted of the physical tests specified in ASTM C 311; these results are applicable to the use of fly ash as an admixture to portland cement concrete. The second consisted of monitoring the changes in the physical properties of fly ash pastes; these results would be applicable to the use of fly ash as a grout or a soil base stabilization agent. The physical properties monitored during the testing program were compressive strength, volume stability and setting time. In general, the results obtained from the two testing programs were quite different. When using testing procedures defined by ASTM C 311 the fly ash appeared quite uniform, but results obtained from the fly ash pastes were quite erratic. It was found that compressive strengths of the pastes can vary by a factor of five in rather short periods of time.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 86: Symposium N – Fly Ash and Coal Conversion By-Products III , 1986 , 337
Copyright
Copyright © Materials Research Society 1987

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References

REFERENCES

1. Schlorholtz, S., Bergeson, K. and Demirel, T., “Variability and Trends in Iowa Fly Ashes,” this volume.Google Scholar
2. American Society for Testing and Materials, 1985 Annual Book of ASTM Standards, Vol.4.02 (ASTM, Philadelphia, Pa, 1985).Google Scholar
3. American Association of State Highway and Transportation Officials, Interim Specification and Methods of Sampling and Testing Adopted by the AASHTO Subcommittee on Materials, 1984, (AASHTO, Washington, D.C., 1984).Google Scholar