HMA joint construction
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Transcript of HMA joint construction
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Wednesday, April 23, 2014 San Diego, CA
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• Transverse Joint Construction Methods
• Longitudinal Joint Construction Methods
• Proper Joint Luting
JOINT CONSTRUCTION
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• Good joints are no mystery
• Training & practice
JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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Butt Joint
JOINT CONSTRUCTION
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JOINT CONSTRUCTION
Rolled Mat
Rolled Mat
New Mat
Paper
Papered Transverse Joint
Remove paper & ramp
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
Remove Tapered area
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• Center tow point • Set width • Set crown • Set extender
slope & height
• Use boards that allow for compaction rate
JOINT CONSTRUCTION
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JOINT CONSTRUCTION
A good rule of thumb is to raise the screed 20 percent more than the compacted thickness.
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JOINT CONSTRUCTION
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• First step is screed pre-‐heating
JOINT CONSTRUCTION
Fuel Pump Spraydown / Burner
Glow Plug / Fan Switches
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JOINT CONSTRUCTION
• Null screed
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JOINT CONSTRUCTION
• Introduce angle of attack
• Crank until resistance is felt
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JOINT CONSTRUCTION
• Fill auger chamber half full
• Conveyor manually
• Auger manually • Shovel if needed
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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• Check smoothness before the mat cools to ensure a good, smooth joint
JOINT CONSTRUCTION
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JOINT CONSTRUCTION
What Happened Here?
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Longitudinal Joints
JOINT CONSTRUCTION
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JOINT CONSTRUCTION
Staggered Paving Joints
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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Notch Wedge (Caltrans Spec’s)
JOINT CONSTRUCTION
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Notch Wedge Joint Maker
JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
Compacted Mat
Uncompacted Mat
Typical Overlap on Longitudinal Joints
Thickness of Rolldown
1 – 1½ inches
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JOINT CONSTRUCTION
Compacted Mat
Uncompacted Mat
Mix “Bumped Back” to Joint
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JOINT CONSTRUCTION
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• Why is this wrong?
JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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JOINT CONSTRUCTION
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Quality Joints are
No Accident!
JOINT CONSTRUCTION
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Questions??
JOINT CONSTRUCTION