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Effects of Fly Ash and Superplasticizers on the Rheology of Cement Slurries

Published online by Cambridge University Press:  25 February 2011

Elizabeth L. White ,
Maria Lenkei ,
Della M. Roy  and
Ferenc D. Tamas
Elizabeth L. White
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
Maria Lenkei
Affiliation:
Central Research and Design Institute for Silicate Industry, H-1034 Budapest, Bécsi Út 126, Hungary
Della M. Roy
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
Ferenc D. Tamas
Affiliation:
Department of Silicate Chemistry, Veszprém University, H-8201 Veszprém, P.O.B. 158, Hungary
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Abstract

Cementitious slurries composed of an oil well cement, a high calcium fly ash, a low calcium fly ash, and three commercially available superplasticizers (two different sulfonated naphthalene formaldehyde condensates and a sulfonated melamine formaldehyde condensate)were mixed to contrast the two fly ashes and to determine the effectiveness of each of the superplasticizing agents. Most commercial superplasticizers and cements are relatively expansive; therefore a partial substitution by fly ash and other by-products represents a substantial savings in both quantity of chemical admixture required and energy consumption for the manufacture of cement. In the cement/fly ash mixtures of 100/0, 90/10, 60/40, 40/60, and 10/90, with both high calcium fly ash and low calcium fly ash, the mixture containing the low calcium fly ash was consistently less workable. The rheological properties of the high vs. low calcium fly ash mixtures were controlled by the differences in fly ash particle size and the presence of irregular large particles, rather than by the differences in chemistry between the two. The low calcium fly ash was the coarser material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 43: Symposium M – Fly Ash and Coal Conversion By-Products I , 1984 , 95
Copyright
Copyright © Materials Research Society 1985

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References

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