is the official designation for the Standard Test Methods for One-Dimensional Swell or Collapse of Soils . It was approved by the American Society for Testing and Materials (ASTM) in February 2021, superseding previous versions (D4546-14, D4546-08, etc.).
: Results are used to design foundations, pavements, and other structures to withstand soil volume changes. The Three Test Methods Astm D4546-21 Pdf
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