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Factors Affecting the Ability of a Fly Ash to Contribute to the Sulfate Resistance of Fly Ash Concrete

Published online by Cambridge University Press:  21 February 2011

G. J. McCarthy ,
P. J. Tikalsky ,
R. L. Carrasquillo ,
O. E. Manz  and
A. Thedchanamoorthy
G. J. McCarthy
Affiliation:
Department of Chemistry, North Dakota State University, Fargo, ND 58105
P. J. Tikalsky
Affiliation:
Ferguson Structural Engineering Laboratory, University of Texas, Austin, Texas 78758
R. L. Carrasquillo
Affiliation:
Ferguson Structural Engineering Laboratory, University of Texas, Austin, Texas 78758
O. E. Manz
Affiliation:
Energy and Mineral Research Center, University of North Dakota, Grand Forks, ND 58202
A. Thedchanamoorthy
Affiliation:
Department of Chemistry, North Dakota State University, Fargo, ND 58105
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Abstract

The objective of this summary is to report on work in progress that is examining parameters, measurable through chemical and XRD analyses, that could indicate whether a fly ash will enhance, degrade or have no effect on the sulfate resistance of fly ash concrete.

Mehta [1–4] has discussed the factors that contribute to attack of sulfates on fly ash concrete. As noted in his review paper on this subject in the preceding volume in this series [1], the agents responsible for concrete expansion and cracking are alumina-bearing hydrates, such as calcium monosulfoaluminate and calcium aluminate hydrate, that are attacked by the sulfate ion to form ettringite, calcium trisulfoaluminate. Acidic type interactions between sulfate ions and calcium hydroxide also lead to strength and mass loss.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 136: Symposium O – Fly Ash and Coal Conversion By-Products V , 1988 , 273
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

1. Mehta, P. K, 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. 145–152.Google Scholar
2. Mehta, P.K., Concrete-Structure. Properties. and Materials. (Prentice Hall, Inc., 1986) pp. 137–145, 1986.Google Scholar
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6. Manz, O.E., McCarthy, G.J., Dockter, B.A., Johansen, D.M., Swanson, K.D. and Steinwand, S.J., paper presented at the ACI Katherine and Bryant Mather Conference on Concrete Durability, Atlanta, April 1987.Google Scholar
7. McCarthy, G.J. and Thedchanamoorthy, A., this volume.Google Scholar
8. Manz, O.E. and McCarthy, G.J., in Fly Ash. Silica Fume. Slag and Natural Pozzolans in Concrete, SP-91, edited by Malhotra, V.M. (American Concrete Institute, Detroit, 1986) pp. 347–366.Google Scholar
9. Day, R.L. and Ward, M.A., in Fly Ash and Coal Conversion By-Products. Characterization. Utilization and Disvosal 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. 153–161.Google Scholar
10. McCarthy, G.J., 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. 75–86 Google Scholar