INTERPRETATION OF THE IMPEDANCE SPECTROSCOPY OF CEMENT PASTE VIA COMPUTER MODELING .2. DIELECTRIC RESPONSE

Dielectric properties of cement pastes are measured using impedance sp ectroscopy, and the effective dielectric constants of the low frequenc y bulk arcs are reported. The unusually high values thereby obtained, and their dependence on reaction time and water:cement ratio, are expl ained by the presence of microstructural features that serve to amplif y the dielectric constants of the individual material phases. The diel ectric properties of three-dimensional cement paste models and of simp le two-dimensional models of the hypothesized microstructural features are analysed. The model results provide insight into the proposed die lectric amplification mechanism in real cement paste.