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Pore Structure Development in Portland Cement/Fly Ash Blends

Published online by Cambridge University Press:  25 February 2011

David J. Cook ,
Huu T. Cao  and
Everett P. Coan
David J. Cook
Affiliation:
National Building Technology Centre, Chatswood, NSW 2067, Australia.
Huu T. Cao
Affiliation:
National Building Technology Centre, Chatswood, NSW 2067, Australia.
Everett P. Coan
Affiliation:
University of New South Wales, Kensington, NSW 2033, Australia.
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Abstract

Pore structure development in portland cement/fly ash blends was investigated using mercury porosimetry and methanol exchange techniques. The progress of hydration was monitored using compressive strength tests. The specimens were made using four water-cement ratios and were hydrated over a one-year period in lime-saturated water. Mercury porosimetry results indicated that the blended cement pastes generally had higher total porosity than plain cement pastes. The major contribution to this increase in porosity was in the form of smaller pore sizes. With reactive fly ash at 20% replacement, the pore structure of mature paste consists mainly of pores nominally smaller than 0.05 μm in diameter. Diffusion parameters obtained from the methanol exchange results were found to be inversely related to the volume of large pores (nominally >0.05 μm) and also to the volume of small pores (nominally <0.05 μm). The effects of the physical and chemical properties of cements and fly ashes on pore structure development are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 86: Symposium N – Fly Ash and Coal Conversion By-Products III , 1986 , 209
Copyright
Copyright © Materials Research Society 1987

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References

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