royal institute of technology stockholm, april 15 th 2014 af2903 road construction and maintenance...

Royal Institute of Technology Stockholm, April 15th 2014

AF2903 Road Construction and Maintenance

Placement of Hot Mix Asphalt

Dr. Alvaro Guarin

Highway and Railway EngineeringDepartment of Transportation Science

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Asphalt Production (Batch Plant)

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Asphalt Production (Continuous Plant)

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Asphalt Production

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Asphalt Production

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Asphalt Production

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No

Yes

Control segregation

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Tarping Loads

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Bottom Dump truck

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Live Bottom Truck

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End Dump Truck

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Materials Transfer Vehicle

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Materials Transfer Vehicle

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Self Propelled Paving Machine

THE BASIC PRINCIPLE HAS NOT CHANGED

MUCH

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Types of Pavers

Wheel type

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Types of Pavers

Track type

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Pavers (Key parts)

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Material Flow

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Paver Operation

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Operational Principles of the Screed

• Self-leveling concepts

• Screed response versus distance

• Forces acting on a screed

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Main Forces Acting on Screed • Speed of paver

• Head of material

• Angle of attack

• Other forces Pre-compaction Screed weight

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Head of Material (Screed)

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Types of Grade Reference

• Stringline

• Mobile reference

• Joint matching shoe

• Sonic sensor

• Laser guided controls

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Stringline

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Mobile Reference

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Joint Matching Shoe

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Sonic Sensor

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Laser guided controls

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Mixture Laydown Problems

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Centerline Segregation

Mixture Laydown Problems

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Questions?