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Standard test methods for liquid limit, plastic limit and plasticity index of soils

Liquid limit

Plastic limit

Select material Check hint 1 and 2

Prepare sample.

Dry method

Prepare sample

Wet method

Method A. Multipoint. Cehck hint 3

Plot the relationship between the water content, Wn, and the corresponding number of drops, N,

Take the water content corresponding to the intersection of the line with the 25-drop

Method B

One-point

Measure ater content for a trial. Check hint 4

Calculate liquid limti with eq 1 and 2

Measure ater content for two trials

Calculate plastic limit with eq 3

Calculate plastic index using eq 4