Why compaction test on back filling is carried out?

The compaction test on back filling is carried out, in order to remove the air voids in the layers, to remove the water pore pressure, to get maximum capacity of load limit and to stabilize the layer in order to make the stability of carrying the load

To get the density required of the back filled materials to resist the load.

it will be remove from the soil profil ,,because we will not make the foundation on refill soil