Question

A fine grained soil has liquid limit of 60 and plastic limit of 20. As per the plasticity chart, according to IS classification, the soil is represents by the letter symbols

• A. CL
• B. Cl
• C. CH
• D. CL-ML

Answer 1

The correct option is C CH

Liquid limit = 60%

Plastic limit = 20%

Plasticity index,

$I_p=60-20=40$

Equation of A line,

$I_{p_c}=0.73(w_L-20)$

= 0.73 (60-20) = 29.2

$I_p>I_{p_c}$

So, point lies above A line $\Rightarrow$ clay

$w_L>50$

$\Rightarrow Highcompressibility$

$\therefore SoilisrepresentedbyCH$