crew vibrating mixture on thetable
Photograph: Kristine Larsen
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Vibrate the Mixture

The crew starts filling the form with concrete. The work is done on a vibration table, a platform that floats on shock absorbers. Vibrating the mixture for about five minutes gets rid of air bubbles that form during the mixing and spreading, and is the key to creating solid, crack-resistant countertops. Workers have about half an hour to spread the mixture after it's poured into the form before it begins to set.
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