AASHTO T 90-22 ✓ Most Recent

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

standard by American Association of State Highway and Transportation Officials , 2022

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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.

Two procedures for rolling out soil samples are provided in this method: the Hand Rolling Method and the Plastic Limit Device Method. The Hand Rolling Method shall be used as the referee procedure.

This test method is often conducted in conjunction with AASHTO T 89, which is used to determine the liquid limit of soils.

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Document History

  1. AASHTO T 90-22

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    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)


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

    • Historical Version

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Product Details

Published:

2022

Number of Pages:

7

File Size:

1 file , 850 KB

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