WIT Press


Experimental Confirmation Of Some Aspects Of The Microstructural Model Of The Impedance Spectra Of Porous Materials

Price

Free (open access)

Paper DOI

10.2495/MC090331

Volume

64

Pages

11

Page Range

347 - 357

Published

2009

Size

402 kb

Author(s)

I. Sánchez, M. Cabeza, M. A. Climent & X. R. Nóvoa

Abstract

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.

Keywords

microstructure, impedance spectroscopy, conductivity, modelling