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A fine grained soil has liquid limit of 60 and plastic limit of 20 as per plasticity chart. According to IS classification, the soil is represented by which of the following letter symbols?

A fine grained soil has liquid limit of 60 and plastic limit of 20 as per plasticity chart. According to IS classification, the soil is represented by which of the following letter symbols? Correct Answer CH

Concept:

  • Plasticity index of soil, Ip = WL - Wp
  • Plasticity index of A-line, Ip = 0.73 ( WL - 20 )

Calculation:

Given,

liquid limit (  WL ) = 60%

plastic limit (Wp) = 20%

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Ip of soil = WL - Wp = 60 - 20 = 40%

Ip of A-line = 0.73 ( WL -20 ) = 0.73 ( 60 - 20 ) = 29.2%

Ip of soil > Ip of A-line, So it will lie above A-line

and also WL > 50%, so soil is CH

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