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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.
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Details
1 Xiamen University, College of Materials, Xiamen, People’s Republic of China (GRID:grid.12955.3a) (ISNI:0000 0001 2264 7233)
2 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)