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ASTM International - ASTM D6572-12

Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test

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Organization: ASTM International
Publication Date: 1 November 2012
Status: inactive
Page Count: 6
ICS Code (Physical properties of soils): 13.080.20
significance And Use:

5.1 The crumb test method provides a simple, quick method for field or laboratory identification of a dispersive clay soil. The internal erosion failures of a number of homogeneous earth dams,... View More

scope:

1.1 Two test methods are provided to give a qualitative indication of the natural dispersive characteristics of clayey soils. Method A is for natural soil clumps and method B for remolded soil.

1.2 These test methods are not applicable for soils with less than 12 % finer than 0.005 mm and with a plasticity index less than or equal to 8.

1.3 The crumb test method has some limitations in its usefulness as an indicator of dispersive clay. 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.

1.4 Oven-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).

1.5 The crumb test method, while a good quick indication of dispersive clay, should usually be run in conjunction with a pinhole test and a double hydrometer test, Test Methods D4647 and D4221, respectively.

Note 1-In some cases, the results of the pinhole, crumb, and double-hydrometer test methods may disagree. Crumb test methods are a better indicator of dispersive clays than of nondispersive clays (3).

1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.

1.6.1 The method used to specify how data are collected, calculated, or recorded in this standard is not directly related to the accuracy to which the data can be applied in design or other uses, or both. How one applies the results obtained using this standard is beyond its scope.

1.7 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.8 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

May 1, 2021
Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test
1.1 Two test methods are provided to give a qualitative indication of the natural dispersive characteristics of clayey soils: Method A and Method B. 1.1.1 Method A-Procedure for Natural Soil Crumbs...
March 1, 2020
Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test
1.1 Two test methods are provided to give a qualitative indication of the natural dispersive characteristics of clayey soils: Method A and Method B. 1.1.1 Method A—Procedure for Natural Soil Crumbs...
November 1, 2013
Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test
1.1 Two test methods are provided to give a qualitative indication of the natural dispersive characteristics of clayey soils:. Method A and Method B. 1.1.1 Method A—Procedure for Natural Soil Crumbs...
November 1, 2013
Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test
1.1 Two test methods are provided to give a qualitative indication of the natural dispersive characteristics of clayey soils: Method A and Method B. 1.1.1 Method A—Procedure for Natural Soil Crumbs...
November 1, 2013
Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test
1.1 Two test methods are provided to give a qualitative indication of the natural dispersive characteristics of clayey soils: Method A and Method B. 1.1.1 Method A—Procedure for Natural Soil Crumbs...
ASTM D6572-12
November 1, 2012
Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test
1.1 Two test methods are provided to give a qualitative indication of the natural dispersive characteristics of clayey soils. Method A is for natural soil clumps and method B for remolded soil....
November 1, 2006
Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test
The crumb test method provides a simple, quick method for field or laboratory identification of a dispersive clay soil. The internal erosion failures of a number of homogeneous earth dams, erosion...
June 10, 2000
Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test
1.1 These test methods provide a qualitative indication of the natural dispersive characteristics of clayey soils. 1.2 These test methods are not applicable for soils with less than 12 % fraction...
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