Bothered by air pockets on the surface of concrete pipes? here is solution

Yesterday, one of my friends Chandrakant told me he is upsetting by the air pockets (or more) on the surface of the concrete, like pictures below.

Adjust the vibrator to high frequencies like 6000rpm instead of 4000rpm, and low amplitude instead of high, let's see what happened.

You may try when your users are critical to the surface of pipes.

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