Investigation of the hydration properties of cement with EDTA by alternative current impedance spectroscopy

Alternative current impedance spectroscopy (ACIS) is a promising non-destructive testing method to monitor long-term change and assess the durability of concrete. This study investigates influences Ethylene Diamine Tetraacetic Acid (EDTA) on hydration hardening cement by ACIS. It found that EDTA retards early-age but can facilitate later age reaction. Pastes with show comparable or higher compressive strength than Control at 28 d, especially when dosage 0.4%. Microstructural characterization results reveal working mechanism originating from its complexing effect free ions. The resistivity evolution pastes detected ACIS well reflect effects in different ages. Proportional relations are identified between other parameters, such as reaction degree, chemical shrinkage, strength. this indicate wider prospect monitoring microstructure macro-properties cementitious materials.