Field Estimated Relative Density Coarse Grained Soils

Question 1

Very loose

Answer 1

Relative density
Less than 15%
N-SPT less than 4

Question 2

Loose

Answer 2

Relative density: 15-35%
N-SPT 4-10

Question 3

Medium

Answer 3

Relative density: 35-65
N-SPT 10-30

Question 4

Dense

Answer 4

Relative density: 65-85
N-SPT 30-50

Question 5

Very dense

Answer 5

Relative density: higher than 85
N-SPT: higher than 50