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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 afterthought”..

  • Layout of the Site

  • Tack Application

  • Paver Practices

  • Proper Depth

  • Proper Overlap

  • Handwork

  • Compaction

  • Quality Control


Layout 1 st pull
Layout – 1 afterthought”..st 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 1 afterthought”..st Pull

2’ section along center line is tacked first


Good paver practice
Good Paver Practice afterthought”..

Paver hopper remains open between dumps

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


Paver practice 1 st pull
Paver Practice – 1 afterthought”..st 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


Definitions
Definitions afterthought”..


Compaction 1 st pull
Compaction – 1 afterthought”..st 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 - 1 afterthought”..st 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 Density afterthought”..2nd Pull

  • Proper tack application

  • Paving practices

  • Correct depth and overlap of material

  • Compaction


Tacking the 2 nd pull
Tacking the 2 afterthought”..nd 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


Tacking the vertical face
Tacking the Vertical Face afterthought”..


Paver practice 2 nd pull
Paver Practice - 2 afterthought”..nd Pull

  • Consistent paver speed

  • Joint matcher for grade control

  • End gates down and augers within 24”


2 nd pull proper depth
2 afterthought”..nd 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
2 afterthought”..nd Pull – Proper Overlap

  • We overlap the joint ½” – 1”

  • Do not trust the “toe test”

  • Handwork?


2 nd pull no handwork necessary
2 afterthought”..nd Pull – No Handwork Necessary

“Bumping the joint..….BAD!”


2 nd pull compaction
2 afterthought”..nd Pull - Compaction

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


2 nd pull compaction1
2 afterthought”..nd Pull - Compaction


2 nd pull compaction2
2 afterthought”..nd 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 afterthought”..

  • Utilize the gauge beyond minimum requirements

  • Prioritize density

  • Have a plan for corrective action


Common longitudinal joint density issues
Common Longitudinal Joint Density Issues afterthought”..

  • 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 afterthought”..

    • 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


    Questions
    Questions? afterthought”..