Graphical Construction Glossary >> Concrete and Concreting. >> Concrete Vibration
Note! I almost said in the definition above that vibrators are used to remove entrained air, but of course some concrete products have air purposely entrained to make them lightweight so I'll use the terms gross voids and entrapped air pockets.
As a very rough rule of thumb it has been said that up to 20% of the material coming out of the back of a transit mixer is air, trapped in the concrete. We have to remove it and the way we do it is to apply vibration to it when it is placed in it's final position, while it is still in a liquid state.
Internal concrete vibration.Above is a petrol engined flexible shaft model that has an 1 1/4" diameter shaft. There are many makes and models of these but this type is very common on construction sites.
The use of these vibrators is very simple, but I will give a brief list of do's and don'ts
External concrete vibration. These come in a few different varieties.
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