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Internal Concrete Vibrators come in various configurations. The most common types are flexible-shaft and motor-in-head models. The primary difference between these two types of internal concrete vibrators is the location of the power unit, which can be located inside or outside of the vibrating head. The flexible-shaft model is the most popular choice for the concrete industry due to its low price. Most flexible-shaft models are powered by an electric motor, though some are powered by a gasoline engine.
In order to make sure the concrete is thoroughly consolidated, the internal vibrator is placed at regular intervals through the entire concrete layer. The tip of the vibrator is inserted approximately six inches deep in the previous layer of concrete, which prevents the formation of cold joints. It is also important to ensure that the concrete is leveled and is free of air bubbles. Untrained operators frequently only vibrate the top layer of concrete, leaving the de-aeration phase incomplete, which can cause the surface to become uneven and blemished. For this reason, operators should have proper training regarding the stages of vibration and the signs that a concrete layer is properly consolidated.
After a concrete layer has been consolidated, the vibrator should be removed from the concrete. In addition, employees should monitor the surface appearance and sound of the concrete for any signs of settling. As the aggregate particles embed, large air bubbles should disappear and a thin layer of mortar will appear on the surface. As the concrete settles, the pitch of the internal vibrator will increase from the initial pitch to its final pitch, indicating that it has completed its task.
