A concrete vibrator is used to remove air bubbles in newly poured concrete as it is settling when poured into a foundation or mold. If these air bubbles are not removed it will weaken the structure and not allow it to bond to the rebar inside the slab. When inserting a vibrator in concrete the settling concrete and will shake or vibrate out the the tiny air bubbles to create a stronger, long lasting pour. When vibrating in concrete there are 3 parts to them: a motor, shaft and head. These three components come in various sizes, lengths and horsepower dependent on the size of the pour. These machines also comes in different configurations like cordless concrete vibrator, electric, gas and backpack machines.
Improves surface appearance and minimize patch work
Slows down rust causing elements by creating a dense compaction
Allows the cement to bond to rebar to create maximum strength
Eliminates rock pockets and lift lines
Best Way To Vibrate Concrete
Allow the head to sink under its own weight vertically when inserting, forcing it may get it stuck in rebar
Hold the unit in place for 5 – 15 seconds then pull it up slowly, if it’s a large or deep pour the head should be held in place every 2 ft for about 15 seconds to avoid trapping any air
When pulling up from the concrete a slight up and down movement will close the hole formed by the head
When reaching the top of the pour remove head and shaft quickly to prevent air getting trapped in top layer
When removing head from concrete let it pass 3-6 inches from the previous layer to ensure a tight bond and preventing lift lines
Pours should not be more then 2 – 3 feet high so the air has a chance to escape
By using the methods above and the right vibrator the aggregate will consolidate and bond together to create a long-lasting slab. In the end a concrete vibrator will remove trapped air bubbles, create a strong bond and create less shrinkage cracks, less bleeding and segregation of the pour.