Concrete Vibrators

Concrete vibrator application

What is a vibrator?

Vibrators are the indispensable machine of the construction industry. Vibrators are devices that produce vibrations used during concrete pouring in order to place concrete into the mold without gaps.

What are the types of concrete vibrators?
Shoulder Type Vibrators
Handheld Electric Vibrators
High frequency Vibrators
Electric motor vibrators
Shoulder Type Gasoline Motor Vibrators

What is the importance of the vibrator in concrete casting? How should concrete be compacted?

  • During the mixing of concrete materials in ready-mixed concrete facilities and placing fresh concrete in place, some air is spontaneously (unintentionally) compressed into the concrete mixture.
  • İçerisinde bir miktar hapsolmuş hava boşluğu bulunduran taze beton, yerleştirildiği kalıbın içerisini tamamen doldurmamış ve yoğunluğu az olan bir beton durumundadır. Beton yerine yerleştirildikten hemen sonra ,bünyesinde yer alan hapsolmuş havanın mümkün olabildiği kadar dışarıya çıkartılması gerekmektedir. Taze betonun içerindeki hapsolmuş havanın dışarıya çıkartılması işlemine “betonun sıkıştırılması ” denilmektedir.
  • As a result of the development of concrete technology, the compression of ready-mixed concrete is done by mechanical methods. In determining the compression method to be applied, some factors such as workability of fresh concrete, form shapes and sizes, frequency and amount of reinforcement to be included in concrete should be taken into consideration.
  • In order to get rid of the air inside the fresh concrete placed in the mold in the ready-mixed concrete sector and to turn the concrete into a less hollow concrete state, the vibration process applied to the concrete is done with vibrating mechanical tools called vibrators.
  • Betonun vibrasyon yöntemiyle sıkıştırılması işlemindeki olaylar iki aşamalı olarak yer almaktadır.Birinci aşamada vibrasyon etkisi ile betondaki harç sıvılaşarak dibe doğru hareket etmekte ve ikinci aşamada betonun içerisindeki hapsolmuş hava dışarı çıkmaktadır. İkinci aşamadaki olay birinci aşamadaki olayla hemen hemen aynı anda yer almaktadır.
  • Taze betonun vibre edilmesindeki ana amaç, betonu kalıba yerleştirmektir. Taze betonu ne kadar vibre ederseniz edin tane çapına bağlı olarak bir miktar hava boşluğu mutlaka beton içerisinde kalacaktır. Hatta bazı özel durumlarda beton içerisinde, hava sürükleyici katkılar vasıtasıyla, ilave hava meydana getirilirki böyle bir betonun dahi vibrasyon yapılarak kalıba yerleştirilmesi gerekir.
  • During the vibration process, the concrete is given the force resulting from the vibrator's eccentric vibration. This force is distributed in the form of wave motion in concrete. In this way, the particles in the concrete repel each other and provide compression and settling in the mold. In case of excessive fluidity and excessive vibration of the concrete, the fine and coarse material is separated from each other and the homogeneity of the concrete is deteriorated. In such a case, the material that settles to the bottom is coarse material.
  • If the water-cement ratio is low, the effect of vibration on strength is very high, and in the case of 0.6 and above, it is almost negligible.

Benefits of Vibration Application :

  • Concrete placement becomes easier.
  • More dense and homogeneous concrete is obtained.
  • The adherence between concrete and reinforcement is better.
  • Higher strength concrete is obtained.
  • When the mold is removed, we get smoother edge lines in concrete.

What are the benefits of applying vibration to fresh concrete?

  • Since it is easy to place concrete, it provides economy.
  • A more dense and homogeneous concrete is obtained.
  • It ensures smooth formation of clear edges of the edges in the concrete, which is molded.
  • Higher strength concrete is obtained.
  • In reinforced concrete, better adherence is provided between concrete and reinforcement.
  • Higher durability is achieved.

What should be considered in vibrator application?

  • The depth of the concrete layer should not exceed the length of the plunger end of the vibrator to be used. Every concrete layer should be subjected to vibration.
  • The vibrator should be immersed in the fresh concrete perpendicularly (maximum 10 degrees inclined from the vertical axis.)
  • The plunger tip of the vibrator should be immersed to the full depth of the fresh concrete layer, even a few cm into the previous layer.
  • The distance between the points where the vibrator tip will be immersed is generally around 40 - 50 cm and 75 cm. should not exceed.
  • The plunger tip should not be kept close to the side surfaces of the concrete formwork.
  • The plunger tip should be immersed quickly in fresh concrete, it should not be kept in the concrete for too short or too long (normal time is 5 - 15 seconds).

Alıntıdır.

Share it!

Comments are closed.