ASTM D422-63 2007

ASTM D422-63 2007

ASTM D422-63 2007

ASTM D422-63 2007

Standard Test Method for Particle-Size Analysis of Soils
ASTM International / 15-Oct-2007 / 8 pages

1.1 This test method covers the quantitative determination of the distribution of particle sizes in soils. ASTM D422-63 2007, 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 (Note 1 and Note 2). Note 1Separation may be made on the No. 4 (4.75 µm), No. 40 (425 µm), or No. 200 (75 µm) sieve instead of the No. 10. For whatever sieve used, the size shall be indicated in the report.Note 2

Two types of dispersion devices are provided: (1) a high-speed mechanical stirrer, and (2) air dispersion. Extensive investigations indicate that air-dispersion devices produce a more positive dispersion of plastic soils below the 20-m size and appreciably less degradation on all sizes when used with sandy soils. Because of the definite advantages favoring air dispersion, its use is recommended. The results from the two types of devices differ in magnitude, depending upon soil type, leading to marked differences in particle size distribution, especially for sizes finer than 20 m.

Keywords: grain-size; hydrometer analysis; hygroscopic moisture; particle-size; sieve analysis; ICS Number Code 91.100.30 (Concrete and concrete products), ASTM D422-63 2007.

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