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عربىAn external concrete vibrator is a powerful compactor used to create a smooth surface on a freshly poured foundation. Its rugged structure and lightweight motor enable it to be easily maintained and repaired.
There are several different types of external vibrators available. They include normal, high frequency and oscillating vibrators. The application of these vibrators can vary according to the needs of the project.
High frequency vibrators can reduce the likelihood of rebar corrosion and cracking. This is because they induce microfractures in the fresh concrete layer. Also, the internal friction between the aggregate particles is reduced.
External vibrators are commonly found in large-scale surface molds for concrete compaction. These molds may contain up to 50 vibrators.
When deciding on an external concrete vibrator, you need to consider the size of the head. Larger heads have a larger radius of effect.
You also need to consider the speed of the vibrator. Typically, a withdrawal speed of 2.5-7.5 cm/s is sufficient.
For better results, you need to insert the vibrator in at least several locations. Depending on the size of the concrete form, you may need a single or two vibrators. However, it is best to space the vibrators at least six feet apart.
The vibration of the concrete will create air bubbles that will exit the slab surface. As the air bubbles rise, they will eventually dissolve. This is because a thin film of water will appear at the surface.
