Electrical properties of cement paste obtained from impedance spectroscopy |
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Authors: | H C Kim S Y Kim S S Yoon |
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Affiliation: | (1) Physics Department, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong Yusong-gu, 305-701 Teajon, Korea;(2) Physics Department, Andong National University, 388, Songch'on-dong, Andong, 760-749 Kyungbuk, Korea |
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Abstract: | The impedance spectra of hydrating Portland cement paste showed a small part of a large depressed arc and a single depressed arc at low- and high-frequency regions, respectively. A new equivalent circuit was proposed for hydrating cement paste, which consists of a serial combination of a resistor and a constant phase element (CPE) with a resistor in parallel for the bulk effects, and a parallel combination of a resistor and a CPE for the electrode effects. The microstructural evolution in hydrating cement paste was associated with the changes in the resistances, capacitance and the critical relaxation time. |
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