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ASTM D4221-99

Historical Revision

Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer

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1.1 This test method, when used in conjunction with a test performed by Method D422 on a duplicate soil sample, provides an indication of the natural dispersive characteristics of clay soils (1).

1.2 This test method is applicable only to soils with a plasticity index greater than 4 as determined in accordance with Method D4318 and more than 12% of the soil fraction finer than 5-[mu]m as determined in accordance with Method D422 (2).

1.3 This test method is similar to Method D422, except that this method covers the determination of percent of soil particles smaller than 5-[mu]m in diameter in a soil-water suspension without mechanical agitation and to which no dispersing agent has been added.

1.4 The amount of particles smaller than 5-[mu]m determined by this method compared with the total amount of particles smaller than 5-[mu]m determined by Method D422 is a measure of the dispersive characteristics of the soil.

1.5 This test method may not identify all dispersive clay soils.

1.6 This standard does not purport to address the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


SDO ASTM: ASTM International
Document Number D4221
Publication Date June 10, 1999
Language en - English
Page Count 3
Revision Level 99
Supercedes
Committee D18.06
Publish Date Document Id Type View
Jan. 1, 2018 D4221-18 Revision
July 1, 2017 D4221-17 Revision
March 1, 2011 D4221-11 Revision
June 10, 1999 D4221-99 Revision
June 1, 2005 D4221-99R05 Reaffirmation