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Sieve analysis on a dry soil sample of mass 1000 g showed that 980 g and 270 g of soil pass through 4.75 mm and 0.075 mm sieve, respectively. The liquid limit and plastic limits of the soil fraction passing through 425 m sieves are 40% and 18% respectively. The soil may be classified as
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- SC
- MI
- CI
- SM
Correct Option: A
Plasticity Index, PI = WC – Wp.
= 40 – 18 = 22%
∵ PI is > 17, soil is highly plastic i.e. clayey soil.
Since, 98% of soil pass through 4.75 mm sieve and 27% through .075 mm sieve, majority of soil lies between 0.075 and 4.75 mm i.e., sand.
∴ Soil is clayey sand (SC)
