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Relationships Between Permeability And Microstructural Characteristics Of Fly Ash Mortars

Published online by Cambridge University Press:  22 February 2011

Robert L. Day and
Ladislav Konecny
Robert L. Day
Affiliation:
Department of Civil Engineering, University of Calgary, Alberta, Canada, T2N IN4
Ladislav Konecny
Affiliation:
Ontario Hydro, 800 Kipling Avenue, Toronto, Ontario, Canada, M8Z 5S4.
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Abstract

The paper describes research to evaluate permeability and the microstructure of mortars containing fly ash as a partial replacement for cement. The replacement levels of cement by fly ash were 35 and 50% by volume and 50% by weight; effectiveness of mortars made with four types of fly ash at two water/cement ratios, 0.47 and 0.65, were assessed. Three types of permeability measurements were made: (a) water permeability, (b) oxygen permeability and (c) permeability to chloride ion by the 6-hour rapid permeability test. Measurements were performed at 7, 28 and 160 days age. Strength gain in the mortar mixes was also monitored. In an attempt to explain trends observed in permeability, the pore structures of oven-dried and solventexchanged specimens were examined by mercury porosimetry. Mortars manufactured with fly ash displayed superior engineering properties when compared to the control mortars. Significant correlations were found among measurements of permeability by water, oxygen and chloride ion. Relationships were also observed between permeability and some microstructural indicators, especially the volume of mercury intruded up to a pressure of 41 MPa (6000 psi).

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