AASHTO T90 – Standard Method of Test for Determining the Plastic Limit and Plasticity Index of Soils
The plastic limit of a soil is the lowest moisture content at which the soil remains plastic. The plasticity index of a soil is the range in moisture content, expressed as a percentage of the mass of the oven-dried soil, within which the material is in a plastic state. The plasticity index is calculated as the numerical difference between the liquid limit and plastic limit of the soil.
plastic limit; plasticity index; soil
AASHTO T90 Accredited Laboratory
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