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Liquid limit, plastic limit and plasticity index

AASHTO T 89 · T 90

Explained inAtterberg Limits

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Liquid limit, plastic limit and plasticity index

AASHTO T 89 · T 90

The liquid limit from a multipoint flow curve or one closure, the plastic limit, and PI.

Liquid limit (T 89)
Liquid limit trials
TrialBlows, NMoisture, %
1
2
3
4

Aim for closures from about 15 to 35 blows, spread on both sides of 25.

Plastic limit (T 90)
Plastic limit trials
TrialMoisture, %
1
2
3

Gives the liquidity index.

Specification

From your specification for the material, if it sets one.

From your specification for the material, if it sets one.

Example values. Moisture contents are percent of oven-dry mass.

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