AASHTO T 90-00 (2008)


Standard Method of Test for Determining the Plastic Limit and Plasticity Index of Soils
standard by American Association of State and Highway Transportation Officials, 2000

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The plastic limit of a soil is the lowest water content determined in accordance with this 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 following applies to all specified limits in this standard: For the purpose of determining conformance with these specifications, an observed value or a calculated value shall be rounded off to the nearest unit in the last right-hand place of figures used in expressing the limiting value, in accordance with ASTM E 29.

The Hand Rolling Method shall be the referee procedure.

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Product Code(s):
MA-T090-00-UL, MA-T090-00-UL
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