An electric vibrator is a construction tool used to compact freshly poured concrete by removing trapped air and ensuring proper settlement of the mixture. It consists of an electric motor, a vibrating head (poker or needle), a flexible shaft, and a power cable or control unit. The motor generates high-frequency vibrations that are transmitted through the shaft to the vibrating head, which is inserted into wet concrete to improve density and strength.
In operation, the electric motor drives an eccentric rotating mass that produces rapid vibrations at the vibrating head. When inserted into concrete, these vibrations cause air bubbles to rise to the surface and allow cement particles to settle uniformly around reinforcement bars and formwork. This process reduces voids, increases concrete strength, and improves surface finish, making it essential in slab casting, column construction, and foundation works.
