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Evaluation of electrode-sample contact impedance under different curing humidity conditions during measurement of AC impedance of cement-based materials

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 measur...

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Autores principales: Wang, Ruipan, He, Fuqiang, Chen, Changping, Dai, Lizong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7577987/
https://www.ncbi.nlm.nih.gov/pubmed/33087818
http://dx.doi.org/10.1038/s41598-020-74925-w
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author Wang, Ruipan
He, Fuqiang
Chen, Changping
Dai, Lizong
author_facet Wang, Ruipan
He, Fuqiang
Chen, Changping
Dai, Lizong
author_sort Wang, Ruipan
collection PubMed
description 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.
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spelling pubmed-75779872020-10-23 Evaluation of electrode-sample contact impedance under different curing humidity conditions during measurement of AC impedance of cement-based materials Wang, Ruipan He, Fuqiang Chen, Changping Dai, Lizong Sci Rep Article 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. Nature Publishing Group UK 2020-10-21 /pmc/articles/PMC7577987/ /pubmed/33087818 http://dx.doi.org/10.1038/s41598-020-74925-w Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Wang, Ruipan
He, Fuqiang
Chen, Changping
Dai, Lizong
Evaluation of electrode-sample contact impedance under different curing humidity conditions during measurement of AC impedance of cement-based materials
title Evaluation of electrode-sample contact impedance under different curing humidity conditions during measurement of AC impedance of cement-based materials
title_full Evaluation of electrode-sample contact impedance under different curing humidity conditions during measurement of AC impedance of cement-based materials
title_fullStr Evaluation of electrode-sample contact impedance under different curing humidity conditions during measurement of AC impedance of cement-based materials
title_full_unstemmed Evaluation of electrode-sample contact impedance under different curing humidity conditions during measurement of AC impedance of cement-based materials
title_short Evaluation of electrode-sample contact impedance under different curing humidity conditions during measurement of AC impedance of cement-based materials
title_sort evaluation of electrode-sample contact impedance under different curing humidity conditions during measurement of ac impedance of cement-based materials
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7577987/
https://www.ncbi.nlm.nih.gov/pubmed/33087818
http://dx.doi.org/10.1038/s41598-020-74925-w
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