Vujora Do not include large nonconductive bodies such as frozen soil, boulders, concrete foundations, etc. The current can be provided by either a cranked ac generator or a vibrator-equipped dc source. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. Current edition approved April 15, A superscript epsilon e indicates an editorial change since the last revision or reapproval. The multi-participant test program results indicate a repeatability Cv of 6. Where regular surveys are to be made at?
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Soil tests can be performed in many ways and for a number of reasons. In agricultural applications, a soil test may be useful for analyzing nutrients and moisture content. In environmental analysis, soil testing is used to detect hazardous material present in the ground. In geotechnical investigations, soil tests may involve cone penetrometer tests to examine certain soil properties. In laboratory settings, soil tests are performed to determine the plasticity index, hydraulic conductivity, particle size gradation, soil compaction, water content, and more.
In electrical engineering, soil tests are used to explore the conductivity of an area where a grounding grid is or will be installed, to protect expensive equipment. In corrosion engineering, soil tests are used to measure soil resistivity to avoid corrosion on a metal structure. Soil resistivity is dependent on the mineral grain composition, moisture content, moisture composition, and soil temperature.
Resistivity values in the ground may vary from less than 1 Ohm meter up to thousands of Ohmmeters. For example, saltwater is around 0. Soil tests using AGI resistivity meters can be performed in a lab or on site in situ , both with the use of an AGI soil test box.
The box is specially calibrated so that the measured resistivity value is given directly in Ohm centimeters with 1 Ohmmeter equal to Ohm centimeters. Because soil resistivity is dependent upon moisture content and temperature, the ASTM G57 standard recommends that soil tests are performed on site. If lab measurements are necessary, all proper precautions must be taken to ensure that the collected field sample is protected from evaporation, and that lab measurements are performed at the same temperature as the actual temperature at the sample site.
The standard describes how on-site field measurements should be taken using a resistivity meter like any of the AGI meters , four electrodes, and single conductor wires. Do you need to perform a soil resistivity test?
If you need to conduct a soil resistivity test, an automated electrical resistivity survey is an effective way to indicate resistivity value and gain additional pertinent information. Advanced Geosciences Inc. AGI is the leading developer and manufacturer of geophysical imaging systems. Ready to discuss your project?
How to perform the Wenner Four-Electrode Method (ASTM G57)