ASTM D 6572 : 2013 : EDT 1
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test
Hardcopy , PDF
11-11-2014
English
01-11-2013
Important note : Users cannot be edited or removed once added to your Multi user PDF.| Committee |
D 18
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| DocumentType |
Test Method
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| Pages |
8
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| PublisherName |
American Society for Testing and Materials
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| Status |
Superseded
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| SupersededBy | |
| Supersedes |
1.1Two test methods are provided to give a qualitative indication of the natural dispersive characteristics of clayey soils: Method A and Method B.
1.1.1Method A—Procedure for Natural Soil Crumbs described in 10.2.
1.1.2Method B—Procedure for Remolded Soil Crumbs described in 10.3.
1.2The crumb test, while a good, quick indication of dispersive soil, should usually be run in conjunction with a pinhole test and a double hydrometer test, Test Methods D4647 and D4221, respectively.
1.3The crumb test has some limitations in its usefulness as an indicator of dispersive soil. A dispersive soil may sometimes give a non-dispersive reaction in the crumb test. Soils containing kaolinite with known field dispersion problems, have shown non-dispersive reactions in the crumb test (1).2 However, if the crumb test indicates dispersion, the soil is probably dispersive.
1.4These test methods are not applicable for soils with 12 % or less of the particles passing 0.005 mm and having a plasticity index less than or equal to 8, as determined by Test Method D4318.
1.5Oven-dried soil should not be used to prepare crumb test specimens, as irreversible changes could occur to the soil pore-water physicochemical properties responsible for dispersion (2).
1.6All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.
1.6.1The procedures used to specify how data are collected/recorded or calculated in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analytical methods for engineering design.
1.7Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.8This 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.
| ASTM D 4221 : 2018 | Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer |
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