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Construction of Longitudinal Joints. 2014 VDOT/VAA Regional Asphalt Seminars Ken Arthur Quality Control Manager Templeton Paving. Relationship between Density and Pavement Life. Low Density Permeability Segregation Poor adhesion at interface.

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construction of longitudinal joints

Construction of Longitudinal Joints

2014 VDOT/VAA Regional Asphalt Seminars

Ken Arthur

Quality Control Manager

Templeton Paving

relationship between density and pavement life
Relationship between Density and Pavement Life
  • Low Density
  • Permeability
  • Segregation
  • Poor adhesion at interface
you must plan for the longitudinal joint it cannot be an afterthought

“You must plan for the longitudinal joint, it cannot be an afterthought”..

Final Draft Report Best Practices for Constructing and Specifying HMA Longitudinal Joints Buncher and Rosenberger, Asphalt Institute 2012

longitudinal joint density
Longitudinal Joint Density
  • Layout of the Site
  • Tack Application
  • Paver Practices
  • Proper Depth
  • Proper Overlap
  • Handwork
  • Compaction
  • Quality Control
layout 1 st pull
Layout – 1st Pull
  • Mark a consistent, straight line for paver operator
  • Offset 6” from existing joint

New joint offset 6”

Existing joint

tacking the 1 st pull
Tacking the 1st Pull

2’ section along center line is tacked first

good paver practice
Good Paver Practice

Paver hopper remains open between dumps

Material should not be pushed more than 24” to end gate

paver practice 1 st pull
Paver Practice – 1st Pull
  • Vibratory screed ON
  • End gates set for neat butt joint
  • Augers within 24” of end gate
  • Consistent paver speed
  • Non-contact ski for grade control
compaction 1 st pull
Compaction – 1st Pull

Roll unconfined edges with a 6” overlap

We generally roll from centerline to outside edge, sealing off longitudinal joint first

compaction 1 st pull1
Compaction - 1st Pull

Beginning just inside of the unsupported edge can cause cracking late in the roller pattern from lateral mix movement

Edge of drum directly on edge of unsupported edge will typically cause lateral movement of mat

longitudinal joint density 2 nd pull
Longitudinal Joint Density2nd Pull
  • Proper tack application
  • Paving practices
  • Correct depth and overlap of material
  • Compaction
tacking the 2 nd pull
Tacking the 2nd Pull
  • Ensure joint is clean
  • Tack the vertical face of the joint with 0.20 gal/S.Y. prior to paving
  • Slight puddling at the base of vertical face is acceptable
paver practice 2 nd pull
Paver Practice - 2nd Pull
  • Consistent paver speed
  • Joint matcher for grade control
  • End gates down and augers within 24”
2 nd pull proper depth
2nd Pull – Proper Depth
  • D2 = D1 + 25%
  • D2 = Depth of 2nd Pull
  • D1 = Compacted Depth of 1st Pull

DON’T STARVE THE JOINT!

2 nd pull proper overlap
2nd Pull – Proper Overlap
  • We overlap the joint ½” – 1”
  • Do not trust the “toe test”
  • Handwork?
2 nd pull no handwork necessary
2nd Pull – No Handwork Necessary

“Bumping the joint..….BAD!”

2 nd pull compaction
2nd Pull - Compaction

A visible white line is assurance that you are not “starving” the longitudinal joint.

2 nd pull compaction2
2nd Pull - Compaction

2nd Pass will leave 6” – 36” depending on road width

3rd Pass pinches joint with sufficient material to achieve compaction

longitudinal joint density qc
Longitudinal Joint Density QC
  • Utilize the gauge beyond minimum requirements
  • Prioritize density
  • Have a plan for corrective action
common longitudinal joint density issues
Common Longitudinal Joint Density Issues
  • Starving the joint, or “bridging”
  • Excessive grade changes
  • Paver speed
      • Rollers unable to keep up with paving operation
      • Electronics affected by inconsistent speed
  • Communication between operators and technicians
longitudinal joint density summary
Longitudinal Joint Density Summary
  • Layout for straight lines and offset joints
  • Quality paving practice with the machine
  • Tack the clean joint location and vertical face
  • Proper depth and overlap
  • Compaction with joint density in mind
  • Diligent quality control
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