A vibrat0r is a tool used to accomplish this.
A vibrat0r is a concrete tool that generates stronger concrete by strenuously shaking the concrete right after it is poured to eliminate the air pockets or air bubbles. The vibrat0r forces the trapped air out of the mixture making the final product a level slab and more compact.
According to the given context where concrete is compacted in the form in order to eliminate trapped air and fill around the reinforcing steel and into all of the corners of the framework. The tool named vibrat0r can be used to serve the purpose.
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