Volume 7, Issue 3, May 2018, Page: 106-114
Evaluation of Sample-Electrode Contact Impedance in Two-Point Measured AC Impedance Spectroscopy of Cement-Based Materials
Fuqiang He, School of Civil Engineering and Architecture, Xiamen University of Technology, Xiamen, China; Key Laboratory for Green Building Materials of Fujian Provincial Education Department, Xiamen, China; Key Laboratory of Fire Retardant Materials of Province Fujian, Xiamen, China
Ruipan Wang, College of Materials, Xiamen University, Xiamen, China
Runxiao Zhang, Department of Civil Engineering, University of Toronto, Toronto, Canada
Changping Chen, School of Civil Engineering and Architecture, Xiamen University of Technology, Xiamen, China; Key Laboratory for Green Building Materials of Fujian Provincial Education Department, Xiamen, China
Li Lin, School of Civil Engineering and Architecture, Xiamen University of Technology, Xiamen, China
Xiaopeng An, China Building Materials Academy, Beijing, China
Received: Mar. 11, 2018;       Accepted: Apr. 24, 2018;       Published: May 22, 2018
DOI: 10.11648/j.ijmsa.20180703.15      View  199      Downloads  8
Abstract
In this study, AC impedance spectroscopy measurements of cement paste with 0.5 W/C were collected and interpreted using different electrode-sample contact methods. The results indicated that when using a conductive glue contact (CG), two capacitive loops and an inclined line appeared within the frequency range of 100-0.1 Hz. An equivalent circuit, Rs (Cd1 (RctZw)) (Rd2Cd2), was proposed for contact impedance of the electrode-sample interface, and correction of error caused by the contact impedance of electrode-sample indicated that the contact impedance had almost no effect on the ACIS measurements of the cement paste with CG contact in the present curing conditions. When the samples were cured in a fog room, the CG and electrode pre-casting (EP) contact had similar interpreted parameters (Pcp). However, the demolded sample-electrode (DS) contact method and the drying environment used in the manufacture of the EP contact can significantly change Pcp. In this situation, both of CG and EP contact are reasonable for ACIS measurements of cement-based materials. EP contact cannot be used for samples cured in a drying environment, and DS contact cannot be recommended for ACIS measurements of cement-based materials.
Keywords
Electrode-Sample Contact Methods, Sample-Electrode Contact Impedance, AC Impedance, Cement-Based Materials
To cite this article
Fuqiang He, Ruipan Wang, Runxiao Zhang, Changping Chen, Li Lin, Xiaopeng An, Evaluation of Sample-Electrode Contact Impedance in Two-Point Measured AC Impedance Spectroscopy of Cement-Based Materials, International Journal of Materials Science and Applications. Vol. 7, No. 3, 2018, pp. 106-114. doi: 10.11648/j.ijmsa.20180703.15
Copyright
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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