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.
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