![]() The Plasticity Index (PI) is the range of moisture contents where the silt or clay remains plastic (PI = LL – PL).įigure 1: Atterberg Limits of a Silt or Clay.The Liquid Limit (LL) is the maximum water content a silt or clay can have before becoming a liquid, i.e.The Plastic Limit (PL) is minimum water content at which a soil is considered to behave in a ‘plastic’ manner, i.e.It is not commonly used and so not discussed further. The Shrinkage Limit (SL) is the water content where further loss of moisture will not result in any more volume reduction.In addition, there is the commonly referred to ‘Plasticity Index’: The Atterberg Limits are: the shrinkage limit, plastic limit, and liquid limit. ![]() Atterberg limits are a basic measure of the critical water contents of fine-grained soils, such as silt and clay, as they transition from a solid to a liquid.Ītterberg Limits are an inexpensive and well documented way of predicting the engineering properties of silt and clay soils. ![]()
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