Humboldt H-3750.5F Relative Density Apparatus - Manual (Page 7)

or in terms of void ratio:
Where:
e
= the volume of voids divided by the volume of solid particle
e
max = void ratio in loosest state
e
min = void ratio in most compact state.
(
e
max
-
e
)
(
e
max
-
e
min)
x 100 Dd =
Relative Density Mold Set