general issues an asphalt technology longitudinal joints
Post on 20-Dec-2015
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General Issues an Asphalt TechnologyLongitudinal Joints
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I – 81 Pennsylvania
April 2005
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I-84, New York
April 2005
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I – 84 Connecticut
April 2005
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Penna. Turnpike
MP 94 - 99
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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 bar or lose the work”
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This is the exception in Maryland, but
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Pave the first lane straight
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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
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Compacted Compacted MatMat
Uncompacted Uncompacted MatMat
Typical Overlap on Typical Overlap on Longitudinal JointsLongitudinal Joints
Thickness of Thickness of RolldownRolldown
25-35 mm25-35 mm
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Bump the joint
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Wedged Edge
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Longitudinal Joint Compaction
• Both drums on hot side first pass
• Force hot material against joint
Hot Mat
Cold Mat
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Longitudinal Joint
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Do We Need a Joint Density SpecificationDo We Need a Joint Density Specification
oror
Prescription Specification ?Prescription Specification ?