Evaluation of microstructural changes in fresh cement paste using AC impedance spectroscopy vs. oscillation rheology and 1H NMR relaxometry

AC impedance spectroscopy (ACIS) is a promising technique for monitoring the microstructure evolution of fresh cement paste in real-time. This paper compared the change of bulk electric resistivity (ρbulk) obtained from ACIS with the developments of storage modulus (G′) and the mean transverse relaxation times (T2) of fresh Portland cement pastes within 5 h. It was found that the three different phases (Phase I, II, and III) on the...