Batch Plants - 1

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HMA Production
Senior/Graduate HMA Course
BATCH PLANTS
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What you will learn.

• How gradation is controlled in a batch plant
• How asphalt binder is controlled in a batch plant
• Operational principles for batch plants
• Using RAP recycle production with a batch plant

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N
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Role of Dryer in Plant Process

• Dry and Heat the Aggregate Materials
• Production Rate of Plant Determined
• by Dryer Capabilities

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Types of Dryers

• Counter-Flow Dryers Used for Batch plants
• Aggregate flows into the burner
• Parallel-Flow Dryers Used for Drum plants
• Aggregate flows away from the burner

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Counter-Flow Batch Plant Dryer
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The Modern Batch Plant Facility
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The Modern Batch Plant Facility
- gradation control at the hot bins
- asphalt binder control at the weigh bucket
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Screen Deck
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Screen Deck
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Hot Storage Bins
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Overflow Chutes
Screens
Hot bins
Overflow chutes
Weigh hopper
Pugmill
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Overflow chutes
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Overflow Chutes(why two chutes?)
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Hot Bin Indicators
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Hot Bin Gates
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Hot Bin Gates
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Aggregate Sampling at Hot Bin Gate
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Aggregate Weigh Hopper
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Aggregate Weigh Hopper
Asphalt Binder Weigh Bucket
Aggregate Weigh Hopper
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Weigh Hopper
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Asphalt Binder Weigh Bucket
Asphalt Binder Weigh Bucket
Aggregate Weigh Hopper
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Asphalt Binder Weigh Bucket (Suspended Inside on
Load Cells)
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Pugmill(dry mix cycle, wet mix cycle)
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Live Zone in Pugmill
Live zone
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Overfilling Underfilling Pugmills
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Inside of Pugmill
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Pre-Computerized, Electro-Mechanical Batch
Automation
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Computerized Batch and Silo Loadout Automation
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Screen from Computerized Batch Automation
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Table Top Computerized Batch Automation
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QUESTIONS?