Determining the Plastic Limit and Plasticity Index of Soil - Soil Properties: Testing, Measurement, and Evaluation - page 97

Soils Testing Laboratory
Plastic Limit Determination
and Plasticity Index

Sample No. 15 Project No. SR 2828

Boring No. B-21 Location Newell, N.C.

Depth of Sample 3 ft

Description of Soil Reddish brown silty clay

Tested by John Doe Date 1/26/08

Determination No.: 1 2

Can no.

A-4 A-5

Mass of can moist soil, M cws (g)

20.47 21.27

Mass of can dry soil, M cs (g)

18.93 19.57

Mass of can, M c (g)

11.56 11.68

Mass of water, M w (g)

1.54 1.70

Mass of dry soil, M s (g)

7.37 7.89

Moisture content, w(%)

20.9 21.5

Plastic limit (%)

21.2

Liquid limit = 46.4 %

Plastic limit = 21.2 %

Plasticity Index = liquid limit - plastic limit = 25.2 %

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