Asphalt2
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Transcript of Asphalt2
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Asphalt Concrete Mix Design and Construction
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Hot Mix Asphalt Concrete (HMA)Mix Designs
• Objective:
–Develop an economical blend of aggregates and asphalt that meet design requirements
• Historical mix design methods
–Marshall
–Hveem
• New
–Superpave gyratory
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Requirements in Common
• Sufficient asphalt to ensure a durable pavement
• Sufficient stability under traffic loads
• Sufficient air voids
–Upper limit to prevent excessive environmental damage
–Lower limit to allow room for initial densification due to traffic
• Sufficient workability
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Place pre-heated aggregate in bowl and add hot asphalt
Mixing
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MixingPlace bowl on mixer and mix until
aggregate is well-coated
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Example of typical full-size compactors.
Compaction
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% binder
VMA
% binder
VFA
% binder
%Gmm at Nini
% binder
%Gmm at Nmax
% binder
DP
% binder
Va
Blend 3
Selection of Design Asphalt Binder Content
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HMA PLANT OPERATION
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Types Of Plants
BATCH DRUM MIXER
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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.
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Batch planttypical layout
Storage Silo
Batch TowerDryer
Conveyor BeltAggregate Bins
Burner
Asphalt Storage
Hot elevator
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Batch Plant
Batch Tower
Pug Mill
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Burner - Batch Plant
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Drum Mixer Planttypical layout
Storage Silo
Dryer
Conveyor BeltsAggregate Bins
Burner
Asphalt Storage
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Drum Dryer Mixer
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Temperature Profile in Drum Mixer
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Dryer For Drum Dryer Mix Plant
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Dryer For A Drum Mixer Plant
Aggregate Entry Point
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Small Drum Mixer Plant
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Plants are computer controlled
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HMA PLACEMENT
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To Be Covered
• Hauling
• Placement
• Compaction
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Different types of trucks are Used
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Self Propelled Paver
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Self Propelled Paving Machine
THE BASIC PRINCIPLE HAS NOT CHANGED
MUCH
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Self Propelled Paving Machine
HMA Flow
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COMPACTION
GOOD COMPACTION
LEADS TO GOOD
PERFORMANCE
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Reason For CompactionReason For Compaction
• To prevent further compactionTo prevent further compaction
• To provide shear strength or resistance to To provide shear strength or resistance to
ruttingrutting
• To ensure the mixture is waterproofTo ensure the mixture is waterproof
• To prevent excessive oxidation of the asphalt To prevent excessive oxidation of the asphalt
binderbinder
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Temperature is critical
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Vibratory Roller
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Pnuematic Roller
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Steel Wheeled Roller
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Extracting A Core
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Questions - ?