Question

A soil has liquid limit = 35, plastic limit = 20, shrinkage limit = 10 and natural moisture content = 25%. What will be its liquidity Index, plasticity Index and shrinkage Index?

• A. 0.67, 15 and 25
• B. 0.33, 15 and 10
• C. 0.67, 25 and 15
• D. 0.33, 20 and 15

Answer 1

The correct option is B 0.33, 15 and 10

(b)
$PlasticityIndex,I_P=W_L-W_P$

= 35 - 20 = 15 %

$LiquidityIndex,I_L=\frac{W_N-W_P}{I_P}=\frac{25-20}{15}=0.33$

$ShrinkageIndex,I_S=W_P-W_S=20-10=10$