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Atterberg limits

The liquid limit, plastic limit and plasticity index for soil. The water content where the soil behavior changes from the semi-liquid to the plastic state is the liquid limit and from the plastic to the semi-solid state is the plastic limit. Plasticity index is the numerical difference between liquid limit and plastic limit and is the range of water content within which the soil behaves as a plastic. For test method, see ASTM D4318.