ASTM D2487-17 Standard Practice for Classification of Soils for Engineering Purposes （Unified Soil Classification System）.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:D2487-171 INTERNATIONAL Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)1 This standard is issued under the fixed designation D2487: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 (s)indicates an editorial change since the last revision or reapproval. This standand has been approved for use by agencies of the U.S.Department of Defense. s NOTE-Footnote L in Table 1 was editorially corrected in April 2020. 1.Scope* is the Airfield Classification System developed by A.Casa- 1.I This practice describes a system for classifying mineral grande in the early 1940s.2 It became known as the Unified and organo-mineral soils for engineering purposes based on Soil Classification System when several U.S.Government laboratory determination of particle-size characteristics liquid Agencies adopted a modified version of the Airfield System in limit and plasticity index and shall be used when precise 1952. classification is required. 1.6 This standard does not purport to address all of the safety concerns if any associated with its use.It is the NoTE 1-Use of this standard will result in a single classification group symbol and group name except when a soil contains 5 to 12 fines or responsibility of the user of this standard to establish appro- when the plot of the liquid limit and plasticity index values falls into the priate safety health and environmental practices and deter- crosshatched area of the plasticity chart.In these...