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ASTM International - ASTM D4221-99(2005)

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

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Organization: ASTM International
Publication Date: 1 June 2005
Status: inactive
Page Count: 3
significance And Use:

Dispersive clays are those which normally deflocculate when exposed to water of low-salt concentration, the opposite of aggregated clays that would remain flocculated in the same soil-water system... View More

scope:

1.1 This test method, when used in conjunction with a test performed by Test Method D 422 on a duplicate soil sample, provides an indication of the natural dispersive characteristics of clay soils ().

1.2 This test method is applicable only to soils with a plasticity index greater than 4 as determined in accordance with Test Method D 4318 and more than 12 % of the soil fraction finer than 5-m as determined in accordance with Test Method D 422 ().

1.3 This test method is similar to Test Method D 422, except that this method covers the determination of percent of soil particles smaller than 5-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-m determined by this method compared with the total amount of particles smaller than 5-m determined by Test Method D 422 is a measure of the dispersive characteristics of the soil.

1.5 This test method may not identify all dispersive clay soils. Pinholes (Test Method D 4647 and crumb tests, or both, ()or the analysis of pore water extract () may be performed to help verify dispersion.

This standard does not purport to address all of the safety concerns, if any, 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.

Document History

January 1, 2018
Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer
1.1 This test method provides an indication of the natural dispersive characteristics of clay soils by comparing the amount of particles finer than 2-μm as determined by this method compared to the...
July 1, 2017
Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer
1.1 This test method provides an indication of the natural dispersive characteristics of clay soils by comparing the amount of particles finer than 2-μm as determined by this method compared to the...
March 1, 2011
Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer
1.1 This test method, when used in conjunction with a test performed by Test Method D422 on a duplicate soil sample, provides an indication of the natural dispersive characteristics of clay soils...
ASTM D4221-99(2005)
June 1, 2005
Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer
Dispersive clays are those which normally deflocculate when exposed to water of low-salt concentration, the opposite of aggregated clays that would remain flocculated in the same soil-water system...
June 10, 1999
Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer
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)....
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