The segregation of the mix can occur at several locations during the mix production, hauling, and placing operation.
Segregation can occur as the mix is delivered from the asphalt plant to a surge silo.
It can take place as the mix is deposited into the haul truck from the silo. It can also occur when the mix is discharged from the truck to the paver hopper. The operation of the paver can enhance or reduce the amount of segregation that appears behind the screed. If the paver hopper is emptied of mix, if the slat conveyors are visible, and if the wings of the hopper are dumped after each truckload of mix, any course aggregate particles that have collected at the tailgate of the new truckload of mix will be deposited into the bottom of the hopper and then carried directly back to the empty auger chamber in front of the screed. This segregated material will appear behind the screed as soon as thepaver moves forward.