A.C. impedance spectroscopy (II): Microstructural characterization of hydrating cement-silica fume systems

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Abstract

The influence of silica fume on impedance behaviour of hydrating cement has been carefully investigated. The results demonstrate that impedance measurement is very sensitive to changes in hydration kinetics and microstructure development due to the presence of silica fume. A modified equivalent circuit containing a frequency dependent resistance element is proposed to model hydration of these microporous systems. A.C. impedance spectroscopy is demonstrated to be a useful tool for studying factors that influence pore structure in cement systems containing finely divided silica.

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