HMA PLANT OPERATION

Types Of Plants

BATCH DRUM MIXER

NCAT 3

Basic Purpose Of HMA Plants

To produce a quality hot asphalt mixture that contains the desired proportions of asphalt and aggregate and meets all specifications.

Batch planttypical layout

Storage Silo

Batch TowerDryer

Conveyor BeltAggregate Bins

Burner

Asphalt Storage

Hot elevator

Drum Mixer Planttypical layout

Storage Silo

Dryer

Conveyor BeltsAggregate Bins

Burner

Asphalt Storage

NCAT 6

Common Plant Operations

• Cold aggregate storage and feeding

• Dust control and collection• Mix storage• Weighing and handling

NCAT 7

Common Plant Operations

• Cold aggregate storage and feeding

• Dust control and collection• Mix storage• Weighing and handling

NCAT 8

Aggregate Stockpile

NCAT 9

Stockpiling Operations

NCAT 10

Cold Feed BINS

Conveyor Belts

NCAT 11

Common Plant Operations

• Cold aggregate storage and feeding

• Dust control and collection• Mix storage• Weighing and handling

NCAT 12

Hma Mixing Plants Create Dust

NCAT 13

Centrifugal Dust Collector

NCAT 14

Baghouse Dust Collector

NCAT 15

Collector Efficiency

74 micron

30 micron

10 micron

5 micron

1 micron

Cylone (80-90%)

Multicone (80-90%)

Wet collector (90-96%)

Baghouse

NCAT 16

Common Plant Operations

• Cold aggregate storage and feeding

• Dust control and collection• Mix storage• Weighing and handling

NCAT 17

Storage Stucture Typical Layout

HOT MIX

PLANTSurge

Bin

Conveyor

SURGE SILO

NCAT 19

Common Plant Operations

• Cold aggregate storage and feeding

• Dust control and collection• Mix storage• Weighing and handling

NCAT 20

Plants are computer controlled

TRUCK BEING LOADED FROM

A DIRECTLY FROM A BATCH

PLANT

Truck Being Loaded From A Surge Silo

NCAT 23

Truck Loading from a Surge Bin

BATCH PLANTtypical layout

Storage Silo

Batch TowerDryer

Conveyor BeltAggregate Bins

Burner

Asphalt Storage

Hot elevator

NCAT 25

Batch PlantBatch Tower

Pug Mill

NCAT 26

Burner - Batch Plant

NCAT 27

Schematic of a batch plant

NCAT 28

Screen Deck

HOT BINS

NCAT 29

Pug Mill

Drum Mixer Planttypical layout

Storage Silo

Dryer

Conveyor BeltsAggregate Bins

Burner

Asphalt Storage

Drum Dryer Mixer

NCAT 32

Temperature Profile in Drum Mixer

Dryer For Drum Dryer Mix Plant

Dryer For A Drum Mixer Plant

Aggregate Entry Point

NCAT 35

Controls

Small Drum Mixer Plant

Sometimes Things Go Wrong

NCAT 38

Questions - ?