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Effect of the Interfacial Transition Zone on the Conductivity of Portland Cement Mortars



J D. Shane, T Mason, D A. Jennings, Edward Garboczi, Dale P. Bentz


The electrical conductivity of portland cement mortars was determined experimentally as a function of the volume fraction of sand and degree of hydration. The results were analyzed using theoretical models that represent the mortars as three-phase, interactive composites. The three phases are the matrix paste, the aggregate, and the thin interfacial transition zone between the two. The microstructure and properties of the conductive phases (the transition zone and matrix paste) were determined by a micrometer-scale microstructural model, and were used in conjunction with random-walk algorithms and differential effective-medium theory to determine the overall mortar conductivities. The presence of the transition zone was not found to significantly affect the global electrical conductivity of the mortar. However, there were significant differences in conductivity between the transition zone and matrix pastes when examined on a local level. These differences were found to vary with hydration and were most significant when the degree of hydration was between 0.5 and 0.8.
Journal of the American Ceramic Society
No. 5


Building Technology, electrical conductivity, interfacial transition zone, mortar


Shane, J. , Mason, T. , Jennings, D. , Garboczi, E. and Bentz, D. (2000), Effect of the Interfacial Transition Zone on the Conductivity of Portland Cement Mortars, Journal of the American Ceramic Society, [online], (Accessed April 24, 2024)
Created April 30, 2000, Updated October 12, 2021