ASTM D 422 - 63 (Reapproved 2007) Standard Test Method for Particle-Size Analysis of Soils

American Society for Testing and Materials (ASTM). Current edition approved Oct. 15, 2007. Published October 2007. 8 р. This test method covers the quantitative determination of the distribution of particle sizes in soils. The distribution of particle sizes larger than 75 μm (retained on the No. 200 sieve) is determined by sieving, while the distribution of particle sizes smaller than 75 μm is determined by a sedimentation process, using a hydrometer to secure the necessary data.