Application of A.C. impedance techniques in studies of porous cementitious materials. (I): Influence of solid phase and pore solution on high frequency resistance

The influence of ionic concentration of pore solution and matrix porosity on high frequency resistance (HFR) of hydrated cement paste were carefully studied. A new relation between HFR and porosity has been derived and its validity demonstrated by a series of experiments. A better description of the intrinsic value and physical meaning of HFR is presented. A convenient means of characterizing microstructural development in hydrating cement or concrete systems is provided by the A.C. impedance technique.