(a) Draw the flow curve and obtain the liquid limit. (b) What is the plasticity index of the soil?

A plastic limit test for a soil showed that moisture content was 18.0%. Data from a

liquid limit test were as follows:





What will be an ideal response?


(a) The liquid limit is defined as the moisture content after 25 blows of the

standardized testing equipment. From the following figure it can be seen that the

liquid limit is approximately 38.5%.



b) Determine the plasticity index using Equation 17.14.

PI = LL – PL

PI = 38.5 – 18.0

PI = 20.5

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