The different soils states are illustrated below. The plasticity Index (PI) is the numerical difference between the LL and PL that represents the range of moisture contents where the soil behaves plastically. The two most common Atterberg Limits are the liquid limit (LL) and plastic limit (PL), determined in accordance with ASTM D4318 “Standard Test Method for Liquid Limit, Plastic Limit, and Plasticity Index of Soils”. The tests performed in a geotechnical laboratory determine the moisture contents where a fine-grained silt or clay soil’s behavior changes between a solid and liquid state. ![]() In geotechnical engineering, the Atterberg Limits are simple and rapid tests utilized to classify fine-grained soils and to evaluate engineering properties, such as compressibility, permeability, shrink/swell, and shear strength of those soils. Click the following link to view the PDF of this paper: Atterberg Limits of Fine-Grained Soils
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