ASTM G57-20 用温纳四电极法测量土壤电阻率的标准试验方法.pdf

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards Guides and Remendations issued by the World Trade Organization Technical Barriers to Trade (TBT)Committee. Designation:G57-20 INTERNATIONAL Standard Test Method for Measurement of Soil Resistivity Using the Wenner Four- Electrode Method This standard is issued under the fixed designation G57:the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon (e)indicates an editorial change since the last revision or reapproval. 1.Scope 2.2 UNS Standards:3 1.1 This test method covers the equipment and procedures UNS Designation S30400 and S30403 for the measurement of soil resistivity both in situ and for UNS Designation S31600 and S31603 samples removed from the ground for use in assessment and 3.Terminology control of corrosion of buried structures. 3.1 Definitions: 1.2 The values stated in SI units are to be regarded as 3.1.I four-electrode soil box n-a non-conductive container standard.The values given in parentheses after SI units are of known internal dimensions with four electrodes for measur- provided for information only and are not considered standard. ing a substance's resistivity. Soil resistivity value...