Test Method Title
Standard Test Method for Field Measurement of Soil Resistivity Using the Wenner Four Electrode Method
Reference Number
ASTM G57
Material
Field Soil
Test Property
Electrical Resistivity
Description of Test
Four metal electrodes are placed with equal separation in a straight line in the surface of soil to a depth not exceeding 5% of the minimum separation of the electrodes. A voltage is impressed between the outer electrodes causing current to flow and the voltage drop between the inner electrodes is measured using a sensitive voltmeter. The resulting resistivity measurement represents the average resistivity of a hemisphere of soil of a radius equal to the electrode separation.
Number of Test Specimens
2 - perpendicular to each other
Test Specimen Size
site specific
Keywords
corrosion, electrical resistivity