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Classification of Coarse Grained Soil

The standard ...

Question

The standard plasticity chart to classify fine grained soils is shown in the given figure.

The area marked X represents

A

silt of low plasticity

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B

clay of high plasticity

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C

organic soil of medium plasticity

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D

clay of intermediate plasticity

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Solution

The correct option is D clay of intermediate plasticity
% LL (Liquid Limit) Plasticity
< 35 Low
35 - 50 Intermediate
> 50 High

Soils above A-line are clays and soils below A-line are silts and organic soils.
Equation of A-line is
$P I = 0.73 (w_{L} - 20)$

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