Temperature dependency of the dielectric properties of hydrated and ordinary Portland cement and their constituent phases at 2.45 GHz up to 1100 °C

This work focuses on microwave (MW)-dehydration and clinkering of hydrated cement paste, by studying the intrinsic MW–material interaction during heating to 1100 °C. The dielectric properties of C3S, C2S, C3A, C4AF, CSH, CH and ettringite were measured using the cavity perturbation method at 2.45 GHz, and their evolution was correlated to phase changes identified using (Q)XRD, TGA and DSC.