The main objective of compaction of concrete is:

Compaction of concrete is the process adopted for expelling the entrapped air as far as possible from the concrete to achieve the highest possible density of the compacted mass.

• Compaction improves the fluidity of concrete and with the reduction of internal friction, packing of coarse aggregates take place
• Compaction leads to the densification of the concrete
• A well-compacted concrete is free of the loose pockets and air bubbles of entrapped air as they are eliminated during the compaction process
• The main purpose of compaction of concrete is to get a dense mass without voids, to get the concrete to surround all reinforcement and to fill all corners i.e. to provide intimate contact between the concrete and embedded materials