What is concrete Vibrator ?
The vibrator is a mechanical device which is used to compact the freshly placed concrete by vibration.
The vibrations cause the mixture to liquefy, reducing the internal friction of the mix components of cement, aggregate, and water.
vibration of concrete is important to achieve consolidation of the concrete mix which often results in a homogeneous concrete.
The vibrations and liquefaction remove air bubbles from concrete.
- There are lots of air bubbles in the freshly placed concrete, which result in decrease the density of concrete.
- So strength of structure decreases and leads to failure of member or structure.
- The vibrations help to bring those air bubbles to the surface where they escape.
Different types of Vibrators
(used in civil work or construction industries)
(i) Needle (Immersion) Vibrators
(ii) External or Shutter Vibrators
(iii) Surface or Plate Vibrators
(iv) Vibrating Table
(i) Needle (Immersion) Vibrators
The needle vibrator consists of a steel tube, known as a poker, with one end being closed and rounded. There is an eccentric vibrating element inside it. The poker is connected to an electric motor (or a diesel motor) through a flex tube.
PRICE OF NEEDLE VIBRATOR:
Price may vary from company to company and the quality if vibrator. But The range of vibrator is varies from INR 700 to 5000 Rupees in INDIA.
External or Shutter Vibrators
These are external vibrator which are placed on shuttering/Formwork.
These vibrator are not so economical because efficiency of vibrator is low as compare to other.
Efficiency is low because these are not directly immersed into concrete. It is placed on outer part of shuttering.
Surface or Plate Vibrators
Surface or plate vibrator is used on plane flooring surface compaction of concrete.
The vibrator is used on the floor concrete and cement concrete road.
Here in the road making, floater is used for compaction and smoothness of the road surface.
Vibrating Table
This is a simple set of vibrator build within table to compact on table.
The material made on table is short in size and used on different location.
Mainly this used in a laboratory or factory.
Most commonly the heavy blocks, paver blocks and other similar material is made by this compaction.
Paver blocks are very low in volume so needle and surface vibrator is not so useful.
The concrete cubes used for testing of compression strength of concrete is also vibrated on vibrating table.
CONCLUSION:
The major use of vibrator is to compact the green concrete to achieve maximum density which is directly proportional to the strength of concrete.
Most common vibrator is needle, because less price and easy handling and used everywhere needed.
Second most common vibrator is plate, this is needed where needle vibrator does not work.
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CEMENT SAND QUANTITY IN BRICKWORK
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