Relative density (Dr) is an index that quantifies the degree of packing between the loosest and densest possible state of coarse-grained soils as determined by experiments such as ASTM D4253 and D4254.
The following equation can be used to determine the relative density of a soil or solid bulk cargo:
Description of Values
The relative density (Dr) correlates very well with the strength of coarse-grained soils - denser soils being stronger than looser soils. A description of sand based on relative density and porosity is given below.
|Relative Density, Dr (%)||Porosity, n (%)||Description|
|40-70||60-30||Medium Dense or Firm|
- Budhu, M. (2011). Soil mechanics and foundations, 3rd edition. New York: Wiley.