14 - construction of asphalt pavements - memphis - construction of asphalt...asphalt plants batch...

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Construction of Asphalt Pavements

Selection of MaterialsPreparing Mix Design

Properly Storing AggregateProperly Drying AggregateAdding Binder and Mixing

Proper Thickness and CrownProper Density at Screen

Proper Size and Type of RollersProper Vibration Frequency

Proper Rolling Pattern

Timely DeliveryMatch Paver Speed

Topics

Production LaydownTransportation

2CIVL 4155/6155

Asphalt Plants

Batch Plant Drum Plant

3CIVL 4155/6155

Material Flow(Taken from The Asphalt Institute Manual ES‐1, Second Edition)

4CIVL 4155/6155

HeatingDrying

Cold Feed Bins

LiquidAsphaltCement

StockpiledAggregate

Material Stockpiles

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Covered Stockpiles

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Mix Production Costs

7CIVL 4155/6155

Batch Plant

8CIVL 4155/6155

Cold Elevator

Hot Elevator

Cold Feed Bins

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ColdElevator

Aggregate Dryer

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Dryer Cutaway

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Mixing Tower Cutaway(Taken from The Asphalt Institute Manual ES‐1, Second Edition)

HOT ELEVATOR

SCREEN DECK & HOT BINS

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Screen Deck & Hot Bins(Taken from The Asphalt Institute Manual ES‐1, Second Edition)

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Pugmill Mixer(Taken from The Asphalt Institute Manual ES‐1, Second Edition)

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Typical Mixing Cycle

1. Aggregate enters pugmill from weigh box

2. Asphalt cement enterspugmill from spraybar

3. Aggregate and asphaltcement are mixed

4. Finished mix dischargedthrough pugmill gate

5. Pugmill gate closes toreceive the next batch

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Storage

SLAT CONVEYOR

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Drum Plant

StorageSilo

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Batch Plant

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Drum Plant

StorageSilo

26CIVL 4155/6155

Parallel‐Flow Drum Plant(Taken from The U. S. Army Corps of Engineers Hot Mix Paving Handbook)

27CIVL 4155/6155

Counter‐Flow Drum Plant(Taken from The U. S. Army Corps of Engineers Hot Mix Paving Handbook)

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Double‐Drum Plant(Taken from The U. S. Army Corps of Engineers Hot Mix Paving Handbook)

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Double‐Drum Plant(Taken from The ASTEC Double‐Barrel Brochure)

CombustionZone Flights

ShoweringFlights

ConditioningFlights

Burner

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Double‐Drum Plant(Taken from The ASTEC Double‐Barrel Brochure)

RAP EntersHere

AC EntersHere

Final ProductExits Here

Burner

31CIVL 4155/6155

Portable Drum Plant

32CIVL 4155/6155

Hot Mix Asphalt Paving

Paving Train

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Asphalt Paver

Hopper Screed

Side Arm

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Asphalt Paver

Screed

Hopper

Side Arm

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Paving Machine

Source: PTC Pavement Guide Interactive

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Paving Machine

Source: PTC Pavement Guide Interactive

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Paving Train

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Material Transfer Device

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Asphalt Compaction

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Asphalt Compaction

ScreedBreakdown RollerIntermediate Roller

Finish RollerTraffic

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Asphalt Compaction

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Asphalt Compaction

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Asphalt Compaction

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