1. Longitudinal Joint Adhesive Pavement Maintenance Bureau of Technical Services Paulette Hanna, P.E, M.Eng.

2. Joint Adhesive technique -Application of specialized materials to the cold joint surface -Seals and protects the low density area -Adheres and flexiblizes the joint

3. Low Density Zone -Higher permeability, weaker area -Increased oxidation/raveling -Moisture freeze/thaw spalling -Crack formation, spalling, widening -Early deterioration -Significant problem

4. Deteriorated Paving Joint -Raveling/Cracking Requires maintenance Shortened pavement life

5. Cause Of Further Deterioration Water Infiltration Thermal Movement Low Density Further Deterioration

7. Discussion -Materials -Installation -Performance studies -Usage and acceptance -Costs

17. Adhesive Materials -Hot-applied, highly polymer modified asphalts with improved high temperature stiffness

18. 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

19. Acceptance: -Ohio Turnpike – 1998 -Michigan – 2001 -New Jersey – 1998 -Minnesota – 2002 -Indiana – 2002 -Kentucky – 2003 -New York – 2004 -Maryland – 2005

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

21. Benefits of Longitudinal Joint Adhesive -Improved joint life -Improved pavement life -Delays future maintenance and related traffic delays and safety issues

22. What Does Longitudinal Joint Adhesive Do? Seals and protects low density zone Creates flexibility at the joint