Figure 8-4.-Pugmillplant. The feeder may be charged by a clamshell orfront-end loader. Aggregate feeder units should havecontrols that can beset and secured to produce a uniformflow of aggregate to the cold elevator.For a uniform OUTPUT from the asphalt plant,INPUT must be accurately measured. The importanceof feeding the exact amounts of each size aggregate intothe dryer at the correct rate of flow cannot beoveremphasized.The following conditions ensure a uniform flow ofaggregate sizes:l Correct sizes of aggregate in stockpiles.l No intermixing of stockpiles.. Accurately calibrated, set, and secured feedergates.. Gates kept free of obstruction.l No excessive arching in the fine aggregates.Arching can be minimized by using rectangular (ratherthan square) openings above the feeders or placingFigure 8-5.-Aggregate storage and cold-feed system.8-3
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