Abstract
An a.c. impedance model for the hydrating cement system and the dependence of impedance parameters on pore structure and ionic concentration of the pore solution have been reported by the authors. The model ascribed the origin of high frequency arcs in impedance spectra to solid-liquid interface phenomena in the system. It is argued that the electrical properties of the bulk phases, such as unhydrated cement, C-S-H, CH and pore liquid, make relatively lesser contributions to the origin of the arc. Impedance measurements of samples made from portland cement, pure C-S-H, pore solution, saturated calcium hydroxide solution and tap water, respectively, were conducted to test the argument
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