VIBRATION OF CONCRETE WHY IMPORTANAT?
Vibrating concrete is a must so that concrete can achieve its design properties
Vibrating concrete makes it more fluid and hence it flows into the corners of the formwork
Air-gaps in concrete are significantly reduced and results in a more consistent density of concrete both at top and bottom
However over-vibrating the concrete will result in segregation of aggregates.
One must be careful that vibrator does not disturb the rebar arrangements especially in areas where rebars are very dense.
For optimum compaction the frequency of the vibrator should be between 10,000 to 12,000 vibrations per minute.