 Meanwhile, water is either being weighed or volumetrically metered and discharged through the same charging chute into the mixer truck.These ingredients are then mixed for a minimum of 70 to 100 revolutions during transportation to the jobsite.A "Wet mix" Concrete Plant, combines some or all of the above ingredients (including water) at a central location into a Concrete Mixer - that is, the concrete is mixed at a single point, and then simply agitated on the way to the jobsite to prevent setting (using agitors or ready mix trucks) or hauled to the jobsite in an open-bodied dump truck.