Question

Laboratory sieve analysis was carried out on a soil sample using a complete set of standard IS sieves. Out of 500 g of soil used in the test, 200g was retained on IS 600$\mu$ sieve, 250 g was retained on IS 500 $\mu$ sieve and the remaining 50 g was retained on IS 425 $\mu$ sieve.

The classification of the soil is

• A. SP
• B. SW
• C. GP
• D. GW

Answer 1

The correct option is A SP

Soil passing through 75 $\mu$ sieve = 0%

Less than 50% is passing through 75 $\mu$ sieve so soil is coarse grained soil (either sand or gravel)

More than 50% of coarser fraction is passing through 4.75 mm sieve, $\Rightarrow$ sand

$C_u<6\Rightarrow$ poorly graded

Hence, soil is classified as SP