ASTM D 421 - 85 (Reapproved 2007) Standard Practice for Dry Preparation of Soil Samples for Particle-Size Analysis and Determination of Soil Constants

American Society for Testing and Materials (ASTM). Current edition approved Sept. 1, 2007. Published September 2007. 2 p. This practice covers the dry preparation of soil samples as received from the field for particle-size analysis and the determination of the soil constants.
This practice can be used to prepare samples for particle-size and plasticity tests where it is desired to determine test values on air-dried samples, or where it is known that air drying does not have an effect on test results relative to samples prepared in accordance with Practice D2217.