Figure 8-13.—Batch asphalt plant hatching unit aggregate weigh-hopper.Bulk or bag filler systems areequally adaptable for continuous-flowasphalt plants. Final metering of thefiller to the mix is accomplished througha variable speed vane, a screw feeder, ora belt feeder, depending on the materialto be handled and the capacity required.In each case, the mineral filler feed isinterlocked with the aggregate and asphaltfeed to ensure constant accuracy.When an excess of filler isencountered in the raw aggregate feed, abypass system can be used to receive thefines collected by the dust collector. Therequired amount of fines is then fed backto the mix, and any surplus amounts arediverted to a storage bin for disposal orother use.BATCH ASPHALT PLANTThe batch asphalt plant is shown infigure 8-1. The cold aggregate storage andfeed system, dryer, and dust collector areboth similar in operations for both thebatch and continuous-flow type of asphaltplant. A distinguishing feature of thebatch plant is the batching unit shown infigure 8-13. Here the dried hot aggregate8-12
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