Generally, concrete compaction should be carried out with the use of a vibrator. Two vibrating devices must be used regardless of the concrete to be casts. Based on the fact that one vibrator, serves around 5 to 10 m³ of concrete per hour, we calculate the required number of devices. For instance, when casting 100 m³ of concrete in 6 hours time, we will need from 100/10/6=1.6 up to 100/5/6=3.2 vibrators, i.e. practically 3 vibrators are needed. When casting a small quantity of concrete e.g. 20 m³, in 4 hours, theoretically one vibrator is enough, however having a backup device is mandatory for security reasons. Nowadays, the best solution is to use light-weight electric vibrators that ensure both high production rates due to their ease of operation and a high vibration quality which is very important especially in visible concrete surfaces (off-form concrete, architectural concrete).
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