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to fill the small voids between forms and concrete and to remove excessive air particles.
To eliminate the air trapped in the concrete while pouring and to achieve the max possible density of concrete when harden.
To consolidate and compact freshly placed concrete. For good bonding between the first layer and the next layer of fresh concrete. To eliminate air bubbles on the freshly poured concrete.
To get better compaction of concrete it is necessary to use vibrators during laying process of concrete. It helps in placing concrete between reinforcements, voids and remove excess air voids. By doing so we can ensure the maximum strength of the concrete. Excess use of vibrators should be avoided as it segregates aggregates and cement slurry and develops honeycombing in the concrete work.
In order to remove air voids from the concrete. So that in future while de-shuttering honeycombing cant take place.
there is air in the concrete by using vibrator we eliminate that air from concrete for good strength
The vibrations cause the mixture to liquefy, reducing the internal friction of the mix components of cement, aggregate, and water. This allows the mix to move around more easily in whatever form you are placing the concrete. ... The vibrations help to bring those air bubbles to the surface etc