block 15 batch plants 13

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HMA Production

BATCH PLANTS

Senior/GraduateHMA Course

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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 – Aggregate flows toward the burner

• Parallel-Flow Dryers – 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

Overflowchutes

Hot bins

Screens

Weighhopper

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

AggregateWeighHopper

Asphalt BinderWeighBucket

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Weigh Hopper

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Asphalt Binder Weigh Bucket

AggregateWeighHopper

Asphalt BinderWeighBucket

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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

Livezone

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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?