Abstract
Dense bodies were formed by cold compaction of Portland cement, with and without silica fume additions, followed by autoclaving at temperatures up to 240°C. Samples were analyzed to determine crystalline phases and pore structures in the cementitious matrix, and their electrical properties (resistivity and complex permittivity) measured. The adsorption of moisture was monitored as a function of relative humidity and correlated to changes in electrical properties. These changes can be explained in terms of the formation of conducting paths as water is adsorbed into the connected pore system.
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