HMA PLANT OPERATION
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HMA PLANT
OPERATION
Types Of Plants
BATCH
DRUM MIXER
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.
NCAT
3
Batch plant
typical layout
Asphalt Storage
Conveyor Belt
Aggregate
Bins
Dryer
Burner
Hot
elevator
Batch
Tower
Storage
Silo
Drum Mixer Plant
typical layout
Asphalt Storage
Aggregate
Bins
Conveyor Belts
Dryer
Burner
Storage
Silo
Common Plant Operations
• Cold aggregate storage and
feeding
• Dust control and collection
• Mix storage
• Weighing and handling
NCAT
6
Common Plant Operations
• Cold aggregate storage and
feeding
• Dust control and collection
• Mix storage
• Weighing and handling
NCAT
7
Aggregate Stockpile
NCAT
8
Stockpiling Operations
NCAT
9
Cold Feed
BINS
Conveyor
Belts
NCAT
10
Common Plant Operations
• Cold aggregate storage and
feeding
• Dust control and collection
• Mix storage
• Weighing and handling
NCAT
11
Hma Mixing Plants Create
Dust
NCAT
12
Centrifugal Dust Collector
NCAT
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Baghouse Dust Collector
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14
Collector Efficiency
74 micron
30 micron
Cylone (80-90%)
Multicone (80-90%)
10 micron
5 micron
1 micron
Wet collector (90-96%)
Baghouse
NCAT
15
Common Plant Operations
• Cold aggregate storage and
feeding
• Dust control and collection
• Mix storage
• Weighing and handling
NCAT
16
Storage Stucture
Typical Layout
Conveyor
HOT
MIX
PLANT
Surge
Bin
NCAT
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SURGE
SILO
Common Plant Operations
• Cold aggregate storage and
feeding
• Dust control and collection
• Mix storage
• Weighing and handling
NCAT
19
Plants are computer
controlled
NCAT
20
TRUCK BEING
LOADED FROM
A DIRECTLY
FROM A BATCH
PLANT
Truck Being Loaded From A
Surge Silo
Truck
Loading
from a
Surge
Bin
NCAT
23
BATCH PLANT
typical layout
Asphalt Storage
Conveyor Belt
Aggregate
Bins
Dryer
Burner
Hot
elevator
Batch
Tower
Storage
Silo
Batch Plant
Batch Tower
Pug Mill
NCAT
25
