What are the two different types of vibrations used in concrete work?

The two different types of vibrations used in concrete work are internal and external. Internal vibration involves the use of a vibrating tool, such as a poker or vibrator, that is inserted into the concrete. This method helps consolidate the concrete and eliminate air bubbles by forcing the particles to settle and align properly. It is essential for ensuring a dense and durable finished product.

External vibration, on the other hand, involves applying vibrations to the surface of the concrete forms or molds from the outside. This technique enhances the consolidation of the concrete mix without the need for direct contact with the material. External vibration is often used in precast applications or where access to the material is limited.

Understanding the distinction between these types of vibrations is crucial for achieving optimal results in concrete placement, ensuring proper compaction, and increasing the longevity and strength of the final structure.