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Determination of chloride diffusivity in concrete by AC impedance spectroscopy
A new method of determination of the diffusion coefficient D of chloride in concrete has been proposed. It has been shown that the AC impedance technique is a powerful tool for the determination. For most simple electrochemical reactions, a Nyquist plot of AC impedance spectra are of the Randles type, which is characterized by a straight line of slope 1 in the low-frequency region. Impedance of diffusion known as Warburg impedance Zw can be obtained from the intersection of the straight line on the real axis. From the coefficient of Warburg impedance Zw, the diffusion coefficient can be calculated. For determination of the chloride diffusion coefficient, a special ideal nonpolarizable electrochemical reaction was chosen. The results are in good agreement with those reported in the literature. The advantage of the new method lies in its simplicity and reproducibility. Due to changes in microstructure, it was found that the diffusion coefficient of chloride in concrete changes with time in the hydration process.
Determination of chloride diffusivity in concrete by AC impedance spectroscopy
A new method of determination of the diffusion coefficient D of chloride in concrete has been proposed. It has been shown that the AC impedance technique is a powerful tool for the determination. For most simple electrochemical reactions, a Nyquist plot of AC impedance spectra are of the Randles type, which is characterized by a straight line of slope 1 in the low-frequency region. Impedance of diffusion known as Warburg impedance Zw can be obtained from the intersection of the straight line on the real axis. From the coefficient of Warburg impedance Zw, the diffusion coefficient can be calculated. For determination of the chloride diffusion coefficient, a special ideal nonpolarizable electrochemical reaction was chosen. The results are in good agreement with those reported in the literature. The advantage of the new method lies in its simplicity and reproducibility. Due to changes in microstructure, it was found that the diffusion coefficient of chloride in concrete changes with time in the hydration process.
Determination of chloride diffusivity in concrete by AC impedance spectroscopy
Shi, Meilun (author) / Chen, Zhiyuan (author) / Sun, J. (author)
Cement and Concrete Research ; 29 ; 1111-1115
1999
5 Seiten, 6 Quellen
Article (Journal)
English
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