English
عربىWhen you pour concrete, it’s common for tiny air bubbles to form. These can cause problems for the strength and durability of your work, so you need to use a concrete vibrator to remove them.
Depending on your project and the type of concrete you’re working with, you may need different types of equipment. These can include formwork vibrators, internal concrete vibrators and surface concrete vibrators.
External Vibrators
When working with precast concrete, you often attach formwork vibrators to the outside of your construction forms. These vibrators release pressurized air or electricity to vibrate air bubbles out of the concrete.
The type of concrete you’re working with can affect the effectiveness of your vibrators, so you should choose the right kind for your needs. Some types of concrete, like low-slump concrete, require more vibration to fully eliminate air bubbles.
Consolidation
Incorrect vibration practices can lead to voids, rock pockets and sand streaks in freshly placed concrete. They can also create problems like cold joints, which are formed when a new layer of concrete is poured over an older layer that has set up and hardened.
To minimize these issues, use internal vibrators by lowering them vertically into the concrete. Then, slowly withdraw the vibrator head at a rate of about one inch per second. This process will help to liquefy the mortar, reducing the friction between aggregate particles.
