Computer simulation of impedance behaviour in hydrating Portland cement systems

Computer simulation is applied to reveal the microstructural influence on the impedance behaviour of a hydrating cement paste system. Changes in two major parameters, porosity and mean pore size, have been taken into account in constructing the impedance spectrum. Simulation results show that a decrease in porosity leads to a decrease in both high-frequency resistance R₁ and high-frequency arc diameter R₂. It has no effect on phase angle shift. A change in mean pore size has a more significant influence than a change in porosity on impedance behaviour, i.e. R₁ and R₂ of a hydrating cement paste system. It also affects the extent of phase-angle shift.