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ASTM D 6572 Document Information:
Title
Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test
ASTM International
Publication Date:
Nov 1, 2006
Scope:
These test methods provide a qualitative indication of the natural dispersive characteristics of clayey soils.
These test methods are not applicable for soils with less than 12 % fraction finer than 0.005 mm and with a plasticity index less than or equal to 8.
The crumb test method has some limitations in its usefulness as an indicator of dispersive clay. A dispersive soil may sometimes give a nondispersive reaction in the crumb test. Soils containing kaolinite with known field dispersion problems have shown nondispersive reactions in the crumb test (1)2. However, if the crumb test indicates dispersion, the soil is probably dispersive.
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).
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 D 4647 and D 4221, 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).
The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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.
2 The boldface numbers in parentheses refer to the list of references at the end of this standard.
Keywords:
- dispersive clays
- dispersibility
- crumb test method
- erosion
- dispersion
- colloidal erodability
- clay (dispersive)
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