Presented to: REDAC By: Navneet Garg, Ph.D. Date: March 15, 2016 Date: March 15, 2016 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update

2 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016 Construction Cycle at NAPTF

3 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016 CONSTRUCTION CYCLE – 7 (CC-7) PRIMARY OBJECTIVES –Develop Perpetual Pavements Design criterion for airport pavements. –Vertical strain threshold in the intermediate HMA layer to limit rutting. –Horizontal strain threshold in the HMA base layer to prevent bottom-up fatigue cracking. –Relationship between laboratory fatigue strain threshold and measured field HMA strains. –Study strain distribution in the HMA layer.

4 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016 Perpetual Pavement is “an asphalt pavement designed and built to last longer than 50 years without requiring major structural rehabilitation or reconstruction, and needing only periodic surface renewal in response to distresses confined to the top of the pavement.” [Perpetual Asphalt Pavements – A Synthesis, Asphalt Pavement Alliance] PERPETUAL PAVEMENT

5 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016 CONSTRUCTION CYCLE – 7 (CC-7) PRIMARY OBJECTIVES –Verify/Refine/Modify fatigue model based on the ratio of dissipated energy change (RDEC) –Overload (South Side Pavements) Determine allowable aircraft overload criteria for flexible pavement.

6 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016 PERPETUAL PAVEMENT

7 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016 CC7 – PERPETUAL PAVEMENTS

8 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016 Pavement Cross Sections

9 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016 Pavement Instrumentation H-Bar Strain Gages (ASG)H-Bar Strain Gages (ASG) Multiple Depth Deflectometers (MDD)Multiple Depth Deflectometers (MDD) Fiber Optic Strain PlatesFiber Optic Strain Plates

10 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016 Traffic Tests: Standard NAPTF wander pattern.Standard NAPTF wander pattern. 55 kips wheel load, 6-wheel gear.55 kips wheel load, 6-wheel gear. Pavement MonitoringPavement Monitoring –Straight Edge Rut Depth Measurements –Surface profiles –Crack maps

11 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016

12 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016

13 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016

14 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016

15 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016

16 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016

17 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, 2016 Summary: Severe cracking in LFC4-N, LFP5-N, & LFS6-N.Severe cracking in LFC4-N, LFP5-N, & LFS6-N. LFP-4N has comparatively less cracking/rutting compared to LFC-5N.LFP-4N has comparatively less cracking/rutting compared to LFC-5N. Minor cracking in LFP3-N, cracks extending from LFP4-N.Minor cracking in LFP3-N, cracks extending from LFP4-N. No cracks in LFP-1N and LFP-2N.No cracks in LFP-1N and LFP-2N. Traffic tests to continue in Spring’2016.Traffic tests to continue in Spring’2016.

18 Federal Aviation Administration Full-Scale Testing – Perpetual Pavement Update March 15, Thank you!