| Test | Standard | Category |
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| Test | Standard | Category |
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In 1911, Atterberg introduced the concept of soil consistency depending on water content.
Water content corresponding to “conventional” passage between different states is defined as Atterberg Limits which vary from one type of clay to another. Thus a clayish soil may appear in one of four states: Solid, Semi-solid, Plastic and Liquid.
Atterberg Limits have been defined and particular procedures created that use specific test equipment such as the Casagrande and Cone Penetrometer Methods.
