How to Use an Internal Vibrator

  • Deposit concrete with a maximum lift thickness of about 20 inches. Make lifts level as possible and do not use the vibrator to move concrete horizontally.
  • Plunge the vibrator vertically into the concrete. Use a uniform spacing not to exceed about one and a half times the radius of influence over the entire placement area.
  • Let the vibrator sink by means of its own weight to the bottom of the lift and penetrate the previous lift about 6 inches.
  • Manipulate the vibrator with an up-and-down motion for 5 to15 seconds to knit the two layers together. Do not worry about over-vibrating the concrete; most concrete is under-vibrated.
  • Withdraw the vibrator gradually with a series of up-and-down motions so air bubbles are worked upward in front of the vibrator.
  • Rapidly extract the vibrator from the concrete when the head becomes partially exposed. If the vibrator hole does not close, partially and quickly reinsert the vibrator a short distance away from the hole.

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