Difficult to make a choice for your new Vibrating Needle? We wrote this Vibrating Needle special buying guide to help you, with the TOP10 of the best sales of the moment, tests, opinions… As in all our buying guides, we have done our best to help you choose the best Vibrating Needle!
Our selection of vibrating needle
Vibrating needle buying guide
In the construction industry, the vibration of the concrete while it is still liquid is an essential step in order to evacuate the air bubbles that formed during preparation and thus improve its quality.To do this, we use a special tool that depends on several factors including the volume of concrete to vibrate and the type of surface to work.Our comparison focused on one tool in particular:the vibrating needle.Convenient and easy to use, this device can be the answer to your worries when preparing concrete.You still need to have the right tool in your hands.Here's what you need to know to make the best choice for a vibrating needle.We've sorted out the tested and approved information to help you make sure you don't go wrong with your purchase.
An overview on vibrated concrete
To make concrete, several materials are mixed: cement, gravel, sand, additives and of course water. During this mixing, which is generally done in the open air, a certain amount of air accumulates in the preparation. This can lead after formwork to an irregular appearance of the concrete or even to cracks.
In principle, all formwork structures must have a homogeneous appearance, in particular the reinforced concrete of the lintels and chains. The vibration of the concrete reduces the air gap that rises to the surface of the preparation. This is called clamping concrete. This task also helps reduce cracks after drying. Finally, it makes it possible to fill all the interstices and other possible voids to give a smooth and homogeneous surface.
To remedy this likely damage, the concrete should be treated while the mixture is still liquid. This is where the vibrating needle comes in. The concrete vibrates in a very short time at the rate of 5 seconds to one minute. The limits must not be exceeded at the risk of leading to an agglomeration of the aggregates at a single point or more concretely of creating a hole in the mixture. The vibration is stopped as soon as the needle stops making the same noise, the mixture is no longer packed and no more air bubbles rise to the surface. What about the vibrating needle?
The vibrating needle in a few words
In general, the vibrating needle is sealed in nature, cylindrical in shape with a conical or hemispherical end. An eccentric weight is located inside the cylinder and acts as a vibrator by rotating rapidly on itself.
Each vibrating needle has a different diameter. It varies between 25 and 100mm or even more. For medium-sized projects with less than 10m3 of concrete, the vibrating needle of 25 to 60mm in diameter is recommended. If you plan a larger volume of concrete, take a larger diameter.
Another important parameter of this tool is the action diameter. Since you have to vibrate all the prepared concrete, you have to do a little calculation to know the correct action diameter. To do this, you must take into account the space between the needle insertion points and the thickness of the veil to be treated.
The characteristics for choosing a vibrating needle
You should know that the vibrating needle comes in two main categories: the pneumatic vibrating needle and the electric vibrating needle. The pneumatic model uses an air compressor from which the vibration emanates. This type of vibrating needle is mainly used in large construction sites at a rate of around 20,000 vibrations per minute, while the electric vibrating needle uses a connection to an electric motor to operate.
Concretely, the choice of a vibrating needle must be based on the following criteria: the voltage of the device at a rate of approximately 220V, a sufficient length between the motor and the needle in the case of an electric model, i.e. between 2 and 6m, a needle diameter at the right size depending on the size of the project, the average vibration per minute which is generally indicated on the device, the output per m3 / hour in order to assess the speed of the work and of course the action diameter. The latter must be adapted to the volume of the mass to be vibrated. Briefly, a needle of 50mm in diameter corresponds to 50cm in diameter of action.
Now that you know more about the vibrating needle with our comparison, you will no longer take the risk of leaving your concrete with air bubbles capable of reducing the quality during drying. Cracks and other damage will then be avoided. Plus, you have all the cards in hand to make the best choice of a vibrating needle. Whether pneumatic or electric, it will give you the quality of concrete you are looking for - provided you use it wisely. Remember not to exceed the vibration time limit.
Dernière mise à jour : 2021-04-10 02:35:22