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
$621,158
$450,000
$900,000
$1,200,000
$1,020,000
$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

11. 2000 Findings/Implementation

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 E1 Fill Cracks 100' Micro-Mill 100'
Overlay High Friction OGFSC E1
Fill Longitudinal Joint
Continue Traffic Experiment

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

22. I hope this was fascinating. LLAP
– (405)

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