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Concrete Compaction
Concrete Compaction is the process adopted for expelling the entrapped air from the concrete. In the process of mixing, transporting and placing of concrete air is likely to get entrapped in the concrete. The lower the workability, higher is the amount of air entrapped. In other words, stiff concrete mix has high percentage of entrapped air and, therefore, would need higher compacting efforts than high workable mixes.In order to achieve full compaction and maximum density, with reasonable compacting efforts available at site, it is necessary to use a mix with adequate workability. It is also of common knowledge that the mix should no t be to o wet fo r easy compaction which also reduces the strength of concrete. For maximum strength, driest possible concrete should be compacted 100 per cent. The overall economy demands 100 per cent compaction with a reasonable compacting efforts available in the field.
The following methods are adopted for compacting the concrete:- Hand Compaction
- Rodding
- Ramming
- Tamping
- Rodding
- Compaction by Vibration
- Internal vibrator (Needle vibrator)
- Formwork vibrator (External vibrator)
- Table vibrator
- Platform vibrator
- Surface vibrator (Screed vibrator)
- Vibratory Roller
- Compaction by Pressure and Jolting
- Compaction by Spinning.
- Hand Compaction
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