This permits the mix to flood the hopper. Truck beds not elevated allow coarse aggregate to fall first, resulting in spotty segregation patterns. Once the paver is in motion, the hopper should maintain 25 percent or more of its capacity at all times. Running the hopper dry before recharging causes random or wing type segregation, which is difficult to distinguish from spotty segergation caused by loading improperly from the silos. Usually, each load can be identified, and spots will be to either side or in the center of the lane.
Late model paving machines permit the operator to dump the side wings.
Caution should be used in wing dumping, because dumping paver wings when the paver is less than 25 percent capacity without receiving a new load of material causes wing type segregation. Paver augers should be turning approximately 85 percent of the time. Adjustments to the paver flow gates may be required periodically to obtain this goal. Paver kickback augers must be maintained in good condition to auger mix under the center gear. A center lane crack is characteristic of worn kickback augers or inadequate auger operation.