When it comes to concrete vibrators there are two general types: external and internal. The latter are submersed in wet concrete while the former are clamped to formwork. In this post, we’ll discuss two internal vibrator choices, the flex shaft and the high cycle vibrator.
Flex shaft vibrators have three components: the power unit (electric or gas), the head (the eccentric weight) and the shaft (the transmission). Flex shaft are the most versatile, commonly used vibrators for most jobs. They are ideal for medium to high-slump concrete.
High-cycle vibrators are designed for use in low slump concrete when consistent power is needed to liquefy and move a stiffer mix around rebar. They are best suited for large concrete pours, footings and foundations.
Differences
Flex-shaft vibrators are by far the most common way to vibrate concrete; they are simple to use and highly portable. As the slump lowers and/or the depth of pour increases, vibration decreases. Whereas high-cycle vibrators incorporate the motor directly attached to the head, eliminating the power drops associated with flex-shaft vibrators. High-cycle vibrators are dependent on special generators that produce 180 hz at 220 volts.