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Fly Ashes Used For Blended Portland Cement: Effect Of Grinding on Cement Quality

Published online by Cambridge University Press:  21 February 2011

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

Tests have been performed with Class F fly ashes used for the production of interground 20% fly ash cement. Unground and ground fly ashes were mixed with a reference high fineness Portland cement and tested for strength in mortar (ISO/CEN method). The fly ashes were also tested for chemical composition, bulk density and specific gravity, fineness (Blaine) and particle size distribution (laser method). There are considerable variations in the specific weights of the asdelivered fly ashes. It is shown that even a small amount of grinding increases the specific gravity significantly, and improves and homogenizes the particle size distributions, resulting in higher strength. The strength increase corresponds to the decrease in air void content.

Intergrinding of fly ash and clinker in large scale mills reduces the power consumption, giving the same 28-day strength as mixed fly ash cement with higher fineness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 136: Symposium O – Fly Ash and Coal Conversion By-Products V , 1988 , 175
Copyright
Copyright © Materials Research Society 1989

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References

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