ASTM D 6572 : 2012
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test
Hardcopy , PDF
11-11-2014
English
11-01-2012
1.1Two 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.
1.2These 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.
1.3The 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.
1.4Oven-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).
1.5The 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.
1.6All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.
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