Abstract

In this study, a simple method was proposed to calculate electrode-sample contact impedance in the cases of two-point and four-point measurements. The results indicated that when using the saturated calcium hydroxide solution (SCH) as conductive medium, the contact impedance in the four-point measurement is negligible for the impedance range of cement-based materials. The SCH can be used as a reference for correction of the contact impedance. A reasonable combination of curing humidity and different conductive media is recommended for the two-point measurement, which is suitable for testing the ACIS of cement-based materials. In a case of contact impedance not being precisely known, it is highly recommended that a four-point measurement with two different ratios of the length of the sample and the center spacing of the voltage electrodes (L/a) should be conducted to evaluate the effect of the contact impedance following the procedure proposed in this study.

Details

Title
Evaluation of electrode-sample contact impedance under different curing humidity conditions during measurement of AC impedance of cement-based materials
Author
Wang Ruipan 1 ; He, Fuqiang 2 ; Chen, Changping 2 ; Dai Lizong 1 

 Xiamen University, College of Materials, Xiamen, People’s Republic of China (GRID:grid.12955.3a) (ISNI:0000 0001 2264 7233) 
 Xiamen University of Technology, School of Civil Engineering and Architecture, Xiamen, People’s Republic of China (GRID:grid.449836.4) (ISNI:0000 0004 0644 5924) 
Publication year
2020
Publication date
2020
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2471501369
Copyright
© The Author(s) 2020. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.