Can Concrete Be over Vibrated?

Yes, concrete can be over vibrated. If the vibrator is left in the concrete for too long, a thick film of water will be on the concrete layer and the cement will tend to sink. This results in a lower strength at the surface of the concrete.

What happens if concrete not vibrated?

Concrete which has not been vibrated is full of small air pockets (sometimes known as honeycombing) which results in a poor finish and weak structure.

What is over vibration of concrete?

For most of concrete mixes, over-vibration creates the problem of segregation in which the denser aggregates settle to the bottom while the lighter cement paste tends to move upwards. ... If concrete is placed in a single lift for road works, the resistance to abrasion is poor for the laitance surface of the carriageway.