HMA PLANT OPERATION

1
HMA PLANT OPERATION
2
Types Of Plants
BATCH
DRUM MIXER
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.

4
Batch planttypical layout
Asphalt Storage
Conveyor Belt
Aggregate Bins
Batch Tower
Dryer
Burner
Hot elevator
Storage Silo
5
Drum Mixer Planttypical layout
Asphalt Storage
Conveyor Belts
Aggregate Bins
Dryer
Storage Silo
Burner
6
Common Plant Operations

• Cold aggregate storage and feeding
• Dust control and collection
• Mix storage
• Weighing and handling

7
Common Plant Operations

• Cold aggregate storage and feeding
• Dust control and collection
• Mix storage
• Weighing and handling

8
Aggregate Stockpile
9
Stockpiling Operations
10
Cold Feed
BINS
Conveyor Belts
11
Common Plant Operations

• Cold aggregate storage and feeding
• Dust control and collection
• Mix storage
• Weighing and handling

12
Hma Mixing Plants Create Dust
13
Centrifugal Dust Collector
14
Baghouse Dust Collector
15
Collector Efficiency
74 micron
Cylone (80-90)
30 micron
Multicone (80-90)
10 micron
Wet collector (90-96)
5 micron
Baghouse
1 micron
16
Common Plant Operations

• Cold aggregate storage and feeding
• Dust control and collection
• Mix storage
• Weighing and handling

17
Storage Stucture Typical Layout
Conveyor
HOT MIX PLANT
Surge Bin
18
SURGE SILO
19
Common Plant Operations

• Cold aggregate storage and feeding
• Dust control and collection
• Mix storage
• Weighing and handling

20
Plants are computer controlled
21
TRUCK BEING LOADED FROM A DIRECTLY FROM A BATCH
PLANT
22
Truck Being Loaded From A Surge Silo
23
Truck Loading from a Surge Bin
24
BATCH PLANTtypical layout
Asphalt Storage
Conveyor Belt
Aggregate Bins
Batch Tower
Dryer
Burner
Hot elevator
Storage Silo
25
Batch Plant
Batch Tower
Pug Mill
26
Burner - Batch Plant
27
Schematic of a batch plant
28
Screen Deck
HOT BINS
29
Pug Mill
30
Drum Mixer Planttypical layout
Asphalt Storage
Conveyor Belts
Aggregate Bins
Dryer
Storage Silo
Burner
31
Drum Dryer Mixer
32
Temperature Profile in Drum Mixer
33
Dryer For Drum Dryer Mix Plant
34
Dryer For A Drum Mixer Plant
Aggregate Entry Point
35
Controls
36
Small Drum Mixer Plant
37
Sometimes Things Go Wrong
38
Questions - ?