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Full Description

The plastic limit of a soil is the lowest water content determined in accordance with the following procedure at which the soil remains plastic. The plasticity index of a soil is the range in water content, expressed as a percentage of the mass of the oven-dried soil, within which the material is in a plastic state. It is the numerical difference between the liquid limit and plastic limit of the soil.

The Hand Rolling Method shall be the referee procedure.

 

Document History

  1. AASHTO T 90-22


    Standard Method of Test for Determining the Plastic Limit and Plasticity Index of Soils

    • Most Recent
  2. AASHTO T 90-20


    Standard Method of Test for Determining the Plastic Limit and Plasticity Index of Soils

    • Historical Version
  3. AASHTO T 90-16


    Standard Method of Test for Determining the Plastic Limit and Plasticity Index of Soils

    • Historical Version
  4. AASHTO T 90-15


    Standard Method of Test for Determining the Plastic Limit and Plasticity Index of Soils

    • Historical Version
  5. AASHTO T 90-14


    Standard Method of Test for Determining the Plastic Limit and Plasticity Index of Soils

    • Historical Version
  6. AASHTO T 90-00 (2008)

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    Standard Method of Test for Determining the Plastic Limit and Plasticity Index of Soils

    • Historical Version