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2015 Pavement Test Track Conference

2015 Pavement Test Track Conference. Oklahoma Report By Kenneth Ray Hobson, P.E. March 4, 2015 Auburn, AL. Outline. Review of Projects Findings/Implementation Future Work. Review of Projects - Costs. 2000 - $621,158 2003 - $450,000 2006 - $900,000 2009 - $1,200,000

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2015 Pavement Test Track Conference

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  1. 2015 Pavement Test Track Conference Oklahoma Report By Kenneth Ray Hobson, P.E. March 4, 2015 Auburn, AL

  2. Outline • Review of Projects • Findings/Implementation • Future Work

  3. Review of Projects - Costs • 2000 - $621,158 • 2003 - $450,000 • 2006 - $900,000 • 2009 - $1,200,000 • 2012 - $1,020,000 • 2015 - $1,020,000?

  4. Review of Projects - Research • 2000 • Compare Hveem Type B vs. ½" NMS Superpave • Compare Skid Resistance • 30% vs. 40% Insoluble Residue • TRZ vs. ARZ

  5. Review of Projects - Research • 2003 • Continue Traffic • Traffic to 20 MESALs Total • 2 Years More Aging

  6. Review Projects - Research • 2006 • Compare Perpetual Designs • On simulated Okla. Soil Base • SMA surface and RBL • 10" vs. 14" • N8 vs. N9

  7. Review Projects - Research • 2009 • Continue Traffic N9 (14") Perpetual • Mill/Replace 5.5" N8 (10") + 2 Fabrics to Retard Cracking • Group Experiment Participant

  8. Review Projects - Research • 2012 • Continue Traffic N9(14") Perpetual • Continue Traffic N8(10") HPM Rehabilitation • Preservation Group Experiment Participant • New OGFSC on E1 • Two NT Tack Coat Types and Rates

  9. 2000 Findings/Implementation • Superpave (S13) Performed Similar to Hveem (S12) • Higher Insoluble Residue = Better Skid Resistance • TRZ (S12) vs. ARZ (S13) Performed Similarly

  10. 2000 Findings/Implementation S12 S13

  11. 2000 Findings/Implementation S13 S12 S12 S13

  12. 2003 Findings/Implementation • Same As 2000 • Hveem and Superpave Performance Similar • APA Adopted by ODOT

  13. 2006 Findings/Implementation • N8's 10" design was not perpetual • Bottom-up cracking • N9's 14" design was perpetual • Designed and Built SH-152 near Airport

  14. 2009 Findings/Implementation • N8's fabrics retarded cracking for a bit • Significant failure at 3.4 MESALs • Geogrid repair failed at 3.6 MESALs • HPM design successful • RIL designed • 2012 HPM Design & Constructed I-40 Caddo Co. • PG 76E-28 (HPM) 1st MSCR Binder

  15. 2009 Findings/Implementation

  16. 2012 Findings/Implementation • N8 (10") repaired due to longitudinal joint • 16.4 MESALs with cracking at end • N9 (14") a bit more wheel path surface cracks • E1 OGFSC performed well • Use High Friction OGFSC on N9 2015

  17. 2012 Findings/Implementation • APA R2 = 0.70 • Hamburg R2 = 0.75 • Hamburg Adopted 2009

  18. 2012 Findings/Implementation N8 May 11, 2011

  19. 2012 Findings/Implementation E1 Tack Coats

  20. Future Work - 2015 • N9 • Fill Cracks 100' • Micro-Mill 100' • Overlay High Friction OGFSC • E1 • Fill Longitudinal Joint • Continue Traffic Experiment

  21. Future Work - 2015 • Sponsor 2nd Cycle of Traffic for Preservation Group Experiment • Sponsor New Cracking Group Experiment • The Undiscovered Country

  22. I hope this was fascinating. LLAP • khobson@odot.org – (405) 522-4986

  23. Acronyms • P.E. – Professional Engineer • AL – Alabama • TRZ – Through Restricted Zone • ARZ – Above Restricted Zone • MESALs – Million Equivalent Single Axle Loads • SMA – Stone Matrix Asphalt

  24. Acronyms • RBL – Rich Bottom Layer • RIL – Rich Intermediate Layer • HPM – High Polymer Mixture • OGFSC – Open Graded Friction Surface Course • NT – Non-Tracking or Nearly Trackless

  25. Acronyms • APA – Asphalt Pavement Analyzer • ODOT – Oklahoma Department of Transportation • MSCR – Multiple Stress Creep Recovery (AASHTO M 332) • NMS – Nominal Maximum Size • LLAP – Live Long and Prosper

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