Title:
Electrode Configurations for Resistivity Measurements on Concrete
Author(s):
W. John McCarter, Gerry Starrs, Siva Kandasami, Rod Jones, and Malcolm Chrisp
Publication:
Materials Journal
Volume:
106
Issue:
3
Appears on pages(s):
258-264
Keywords:
electrical resistivity; electrodes; frequency; impedance.
DOI:
10.14359/56550
Date:
5/1/2009
Abstract:
In this study, two- and four-electrode arrangements were used to evaluate the electrical resistance (hence resistivity) of saturated concrete specimens using both embedded rod-electrodes, external plate-electrodes, and combinations thereof. Measurements were obtained mainly at a fixed frequency of 1 kHz. It is shown that the two-electrode external plate measurement system gave higher resistivity values than the four-electrode system; however, studying the electrical response in terms of complex impedance, over the frequency range 1 to 10 MHz, revealed that the sponge-contacting system used in the two-electrode method introduced a spurious resistance attributed to the sponge-sample interface.