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36 Vibrated Concrete: Concrete consolidated by vibration from an internal or external vibrator.  It requires very much less water for effective placing than does concrete compacted by punning, therefore it is much stronger.  The formwork, however, must also be stronger when the concrete is to be vibrated.  Concrete in hollow-tile floors is not vibrated. The formwork, however, must also be stronger when the concrete is to be vibrated.  Concrete in hollow-tile floors is not vibrated. The formwork, however, must also be stronger when the concrete is to be vibrated.  Concrete in hollow-tile floors is not vibrated.