general issues an asphalt technology longitudinal jointsspave/old/technical... · industry must...

General Issues an Asphalt TechnologyLongitudinal Joints

I – 81 Pennsylvania

April 2005

I-84, New York

April 2005

I – 84 Connecticut

April 2005

Penna. Turnpike

MP 94 - 99

Industry MUST exercise more Industry MUST exercise more care in batching placing and care in batching placing and

compacting asphalt pavementscompacting asphalt pavements

The Port Authority of New York & New Jersey

“Raise the baror

lose the work”

This is the exception in Maryland, but

Pave the first lane straight

Compacting Unconfined Edges

• Unconfined edges may shove out

• First pass 6 - 12”from edge to develop lateral confinement

• Second pass slight overhang

• Compacted portion supports weight of drum

Compacted Compacted MatMat

Uncompacted Uncompacted MatMat

Typical Overlap on Typical Overlap on Longitudinal JointsLongitudinal Joints

Thickness of Thickness of RolldownRolldown

2525--35 mm35 mm

Bump the joint

Wedged Edge

Longitudinal Joint Compaction

• Both drums on hot side first pass

• Force hot material against joint

Hot Mat

Cold Mat

Longitudinal Joint

Do We Need a Joint Density SpecificationDo We Need a Joint Density Specification

oror

Prescription Specification ?Prescription Specification ?