Electrochemical Impedance Spectroscopy Study of the Compressive strength of Concrete

The compactness of cementitious materials is closely related to their mechanical properties and durability. In addition to compressive strength testing, electrochemical impedance spectroscopy (EIS) was applied to measure mortars with different cement contents. The relationships between the compressive strength and EIS results are also discussed. The results suggest that the compressive strength of the samples increased with the impedance and phase angle at low frequency. In particular, most of the compressive strength almost linearly increased with the phase angle when the frequency was lower than 10 Hz. Consequently, compared with the impedance values, the phase angle at low frequency is more suitable for assessing the compressive strength of concrete.