![]() ![]() A thread of soil is at its plastic limit when it is rolled to a diameter of 3 mm or begins to crumble. The plastic limit (PL) is the water content where soil starts to exhibit plastic behavior. The shrinkage limit is much less commonly used than the liquid limit and the plastic limit. The shrinkage limit (SL) is the water content where further loss of moisture will not result in any more volume reduction. In view of this, Arthur Casagrade and others suggested more practical definitions with special reference to the laboratory devices and methods developed for the purpose of the determination of the consistency limits. The definitions of the consistency limits proposed by Atterberg are not, by themselves, adequate for the determination of their numerical values in the laboratory, especially in view of the arbitrary nature of these definitions. The Atterberg limits can be used to distinguish between silt and clay, and it can distinguish between different types of silts and clays. Thus, the boundary between each state can be defined based on a change in the soil's behavior. In each state the consistency and behavior of a soil is different and thus so are its engineering properties. Depending on the water content of the soil, it may appear in four states: The Atterberg limits are a basic measure of the nature of a fine grained soil. ![]()
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