Early-age characterisation of Portland cement by impedance spectroscopy

Alternating current impedance spectroscopy (ACIS) was used to assess the effect of different sand, anhydrite and water contents on electrochemical response Portland cement paste in early stages hydration. Potential factors that may affect measurements data interpretation are also discussed, such as complexity chemical composition cement, its physical properties hydration kinetics, technique limitations. The obtained were benchmarked against supporting techniques literature data, showing a strong relationship among rates determined by thermochemistry, setting time approaches, pore fluid chemistry, electrical conductivity observed behaviour. results demonstrate ACIS is sensitive for assessing hydration, enabling differentiation changes content, degree microstructural development during first 24 h after mixing.