Direction: Laboratory sieve analysis was carried out on a soil sample using a complete set of standard IS sieves. Out of 500g of soil used in the test, 200g was retained on IS 600μ sieve, 250g was retained on IS 500μ sieve and the remaining 50g was retained on IS 425μ sieve.
-
The coefficient of uniformity of the soil is
-
- 0.9
- 1.0
- 1.1
- 1.2
Correct Option: D
Uniformity coeff,
| Cu = | D10 |
D60 means diameter of soil such that 60% of soil is finer than this size and similar for D10 also.
% of soil passing through IS 600 μ sieve
| = | = × 100 = 60% | 500 |
∴ 600 μ is D60.
% of soil passing through IS 500µ sieve
| = | = × 100 = 10% | 500 |
∴ 500 μ is D10.
| ∴ Cu = | = | = | = 1.2 | |||
| D10 | 500 μ | 5 |
