Abstract
This report describes the compaction by internal vibrator for fresh concrete made with artificial lightweight aggregate.
The pressure caused to the vibrator was measured at random in concrete by means of the pressure gage embeded in concrete. The acceleration was calculated upon the measured value of the pressure.
Float of lightweight coarse aggregate occurred during the vibration within the range of about 20cm from the vibrator. This phenomena can be prevented by limiting the vibration at each point within ten seconds.
The effective zone for compaction corresponding to four times as much acceleration of gravity is about 30cm from the vibrator.
