Experimental Confirmation Of Some Aspects Of The Microstructural Model Of The Impedance Spectra Of Porous Materials
Free (open access)
347 - 357
I. Sánchez, M. Cabeza, M. A. Climent & X. R. Nóvoa
The use of impedance spectroscopy, IS, has become a useful technique for the microstructural characterisation of cement pastes and mortars. The main advantage is that it is non destructive, but in the other hand the interpretation of the results obtained is not straightforward. A model has been proposed that gives microstructural interpretation of the electrical parameters obtainable from the impedance data. Here is presented a validation of that model, using a model material, which allows controlled changes in the electrolyte conductivity to be monitored by IS. The conductivity of pore solution cannot be controlled in cementitious materials, which makes very difficult to differentiate between changes of pore structure and changes in conductivity. The results presented here show good agreement between predictions of the model, and experimental results. Keywords: microstructure, impedance spectroscopy, conductivity, modelling.
microstructure, impedance spectroscopy, conductivity, modelling