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 2012 - $1,020,000 2015 - $1,020,000?
Review of Projects - Research 2000 Compare Hveem Type B vs. ½" NMS Superpave Compare Skid Resistance 30% vs. 40% Insoluble Residue TRZ vs. ARZ
Review of Projects - Research 2003 Continue Traffic Traffic to 20 MESALs Total 2 Years More Aging
Review Projects - Research 2006 Compare Perpetual Designs On simulated Okla. Soil Base SMA surface and RBL 10" vs. 14" N8 vs. N9
Review Projects - Research 2009 Continue Traffic N9 (14") Perpetual Mill/Replace 5.5" N8 (10") + 2 Fabrics to Retard Cracking Group Experiment Participant
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
2000 Findings/Implementation Superpave (S13) Performed Similar to Hveem (S12) Higher Insoluble Residue = Better Skid Resistance TRZ (S12) vs. ARZ (S13) Performed Similarly
2000 Findings/Implementation
2000 Findings/Implementation
2003 Findings/Implementation Same As 2000 Hveem and Superpave Performance Similar APA Adopted by ODOT
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
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
2009 Findings/Implementation
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
2012 Findings/Implementation APA R2 = 0.70 Hamburg R2 = 0.75 Hamburg Adopted 2009
2012 Findings/Implementation N8 May 11, 2011
2012 Findings/Implementation E1 Tack Coats
Future Work - 2015 N9 E1 Fill Cracks 100' Micro-Mill 100' Overlay High Friction OGFSC E1 Fill Longitudinal Joint Continue Traffic Experiment
Future Work - 2015 Sponsor 2nd Cycle of Traffic for Preservation Group Experiment Sponsor New Cracking Group Experiment The Undiscovered Country
I hope this was fascinating. LLAP khobson@odot.org – (405) 522-4986
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
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
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