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Chapter: Civil - Construction Techniques, Equipment And Practices - Concrete Technology

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Compaction of concrete

Compaction of concrete is the process adopted for expelling the entrapped air from the concrete

 

Compaction of concrete

 

Compaction of concrete is the process adopted for expelling the entrapped air from the concrete

 

Method for compacting concrete

Hand compaction

 

Compaction by vibrator

Compaction by pressure and jolting

Compaction by spinning

 

Poking the concrete with about 2m long 16 mm dia rod to poke the concrete reinforcement

 

Ramming

 

Should be done with care Permitted in unreinforced foundation concrete in ground floor construction

 

Tamping

The thickness of conc should be comparatively less. Consist of beating the op surface

 

bywooden cross beam The section of wooden beam is about 10x10 cm

 

1 Compaction by vibrators

 

We can place the concrete economically when compared to hand compaction

 

The use of vibrators may be essential for the production of good concrete Type

 

of vibrators

 

Internal vibrator

 

Formwork vibrator

 

Table vibrator

 

Platform vibrator

 

Surface vibrator

 

Vibratory rollers

 

Compaction by pressure and jolting

 

This is one of the effective method of compacting dry concrete. Often used for compacting hollow block ,cavity blocks concrete blocks.The stiff concrete is vibrated pressed and also given jolts. With the combined action of the three the stiff conc gets compacted to an dense form to give good strength and volume

 

Compaction by spinning

 

This is one of the recent method of the compacting concrete. This is adopted for fabrication of concrete pipes. The plastic concrete when at every high speed get well compacted by centrifugal force. Potential products such as spun pipes are compacted by spinning process

 

Vibratory rollers

 

One of the recent methods of compacting very lean or dry concrete. The concrete compacted by rollers can be called as roller concrete.


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