Longitudinal Joint Adhesive

Pavement Maintenance

Bureau of Technical ServicesPaulette Hanna, P.E, M.Eng.

• Joint Adhesive technique

• -Application of specialized

materials to the cold joint surface

• -Seals and protects the low density

area

• -Adheres and flexiblizes the joint

Low Density Zone

-Higher permeability, weaker area

-Increased oxidation/raveling

-Moisture freeze/thaw spalling

-Crack formation, spalling, widening

-Early deterioration

-Significant problem

Deteriorated Paving JointDeteriorated Paving Joint

-Raveling/Cracking-Raveling/Cracking

Requires maintenanceRequires maintenance

Shortened pavement lifeShortened pavement life

Cause Of Further Deterioration

Water Infiltration

Thermal Movement

Low Density

Further Deterioration

Discussion

• -Materials

• -Installation

• -Performance studies

• -Usage and acceptance

• -Costs

Adhesive Materials

-Hot-applied, highly polymer modified asphalts with improved high temperature stiffness

Installation

-Oil jacketed, hot applied melters

-Spray or squeegee apply to entire surface

-Approx. 1/8” thick band.

-Approx. ½” overlap on top, up to 2” on bottom

-Apply ahead of paver

-Keep traffic off of, repair any damaged areas

-Place and compact adjacent mat

Acceptance:

-Ohio Turnpike – 1998

-Michigan – 2001

-New Jersey – 1998

-Minnesota – 2002

-Indiana – 2002

-Kentucky – 2003

-New York – 2004

-Maryland – 2005

Costs

-Installed – approx. $.40/ft. or $2,000/mile

Benefits of Longitudinal Joint Adhesive

-Improved joint life

-Improved pavement life

-Delays future maintenance and related traffic delays and safety issues

What Does Longitudinal Joint Adhesive Do?

Seals and protects low density zone

Creates flexibility at the joint