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3 Types of Concrete Vibrator

A Man Holding A Concrete Vibrator
Many DIY-inspired homeowners opt to complete concrete installation projects themselves. This can be a great way to get a new patio, sidewalk, or driveway at a fraction of the cost of hiring a contractor. But you must be sure to educate yourself on all aspects of concrete installation - otherwise, you may end up with less than stellar results.

One of the most important aspects of concrete installation - as well as one of the most overlooked - involves vibrating the freshly poured concrete. This process eliminates potentially problematic air pockets. If you would like to learn more about the process of concrete vibration, read on. This article will introduce you to three of the most common types of concrete vibrator.

1. Immersion Vibrator

Immersion vibrators - also known as internal vibrators - constitute the most widely utilized type of concrete vibrator. A vibrating steel tip connects to an electric motor by means of a flexible and sturdy hose.

As its name would imply, an immersion vibrator is designed to work below the surface of the concrete. The narrow diameter of this hose allows the vibrator to be inserted into relatively tight spaces, such as the gaps between rebar and other reinforcing agents.

The motor powers the rotation of an eccentric weight located in the tip of the vibrator. The high-speed rotation of this weight causes the tip to vibrate. Most immersion vibrators possess a vibration rating between 12,000 and 17,000 vibrations per minute, or VPN for short.

As the weight rotates, the resulting vibrations allow air to escape from air pockets trapped in the concrete. For best results, the vibrator should be inserted in as close to a vertical position as possible. Also be careful not to withdraw the vibrator too quickly. This will cause void spaces to form, essentially negating the benefit of the vibration.

2. External Formwork Vibrator

Immersion vibrators represent the most effective choice when dealing with wide and relatively shallow expanses of concrete. This may include the installation of such things as floors and driveways. When building thinner, more vertical sections of concrete -for instance, the walls of a building - immersion vibration won't always be the best choice.

Here, the immersion wand simply may not be long enough to penetrate all the way to the bottom of the concrete. In this case, a more appropriate choice is using external formwork vibrators. These vibrators attach directly to the outside of the forms. Contractors install multiple vibrators to ensure thorough vibration at all depths.

3. Surface Vibrator

These large vibrators, also referred to as jumpers, sit on top of the wet concrete slab. It sends its vibrations down into the concrete as workers carefully pull it across the surface. Surface vibrators struggle when it comes to eliminating air pockets from concrete slabs more than six inches deep.

But for thinner slabs, surface vibrators offer potent results. Using an immersion vibrator on thin slabs can be problematic because the tip of the vibrator may not be able to penetrate deep enough into the concrete. Not only does a surface vibrator excel at reducing air pockets, but it also doubles as a bull float. This leaves the surface of the concrete especially smooth and even.

Surface vibrators are also a great choice when installing concrete with a low slump value. Low slump concrete contains less water for each part of cement. This makes the concrete stiffer and harder to work with. It also makes it harder to finish with traditional vibrators. Surface vibrators, however, can achieve excellent and even results.

Vibration plays a key role in a successful concrete project. For more information about renting the right kind of concrete vibrator for your next project, please don't hesitate to call our team of rental experts at Rex Rental Inc.

Give us a call at 954-584-1800.


Rex Rental Inc.
1921 S State Road 7
Davie, FL 33317

Phone: 954-584-1800
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