PI: Erol Tutumluer RA: Phillip Donovan

1. Analysis of NAPTF Trafficking Dynamic Response Data For Pavement Deformation Behavior Center of Excellence for Airport Technology, CEAT Research Progress and FY07 Tasks – January 30, 2007 PI: Erol Tutumluer RA: Phillip Donovan

2. Introduction • NAPTF designed to investigate NGA/pavement system interaction • Previous analysis found disturbing trends -- Wander caused downward deformation to be offset by upward deformation (shuffling of system elements) • May need improvements in our aggregate lab testing and modeling for permanent deformation

3. Research Objectives • Detailed analysis of deformation trends • Goals • (1) Investigate deformation trends based on • load magnitudes and loading sequences (stress history and application effects) • trafficking speeds (load duration effects) • traffic directions (shear stress reversals) • gear spacing and gear/wheel interaction • wander positions and wander sequence effects • (2) Validate rutting models for unbound base and subbase

4. Work Plan Status • Task I: Acquire NAPTF trafficking response data for the CC1 and CC3 test sections • Most data have been obtained • Some data not compiled yet • No data at all from LFC MDD sensors • CC3 trench data • Most sensors have limited amount of sensor records • Example: MFC 777 path sensor 1537, 16,000 events recorded only events 2800-4000 have sensor records

5. Work Plan Status • Too much data in other cases • LFS sensor records 400+ data points • Cannot analyze in Excel (only 256 columns) • Only last 200 data points required • Access to NAPTF database during FAA meeting in April would be extremely helpful • Data download and verification of sensors

6. Work Plan Status • Task II: Analyze NAPTF Trafficking Response Data for Individual Gear/Wheel Passes • Analysis of MFC 777 path data showing: • Effect of wander positions and wander • Effect of traffic direction

7. Task II:Progress Made In 2006

8. Task II:Progress Made In 2006

9. Task II:Progress Made In 2006

10. Task II:Progress Made In 2006 4 4 3 3 2 2 -3 -3 -2 -2 -4 -1 -4 -1 1 1 0 0

11. 4 W-E 4 E-W 2 W-E 2 E-W -3 W-E -3 E-W 0 E-W 0 W-E Task II:Progress Made In 2006

12. Task II:Progress Made In 2006 2 -2 -3 4 -4,4 -1 3 3 2 -3 1 -2 0 -1 -4 1 16,000 events 0

13. Task II:Progress Made In 2006 -3,-2,2 4 4 3 -1 -4 1 3 0 2 -2 -3 -1 -4 4000 events 1 0

14. Task II:Progress Made In 2006 -3,-2,2 4 4 3 -1, -4 3 1 2 0 -2 -3 -4 -1 1 0

15. Work Plan Status • Task II: continued • Analysis of other sensors progressing • MFC - 747 • MFS – 747 (no 777 MDD data) • LFx – 777 and 747 • Individual layer residual and rebound response

16. Work Plan Status • Task III: Analyze NAPTF trafficking response data for pavement loading until failure • To be evaluated after rutting analysis • Task IV: Identify and evaluate deformation trends in the CC1 and CC3 test sections • Progressing with Task II • Task V: Develop and Validate Realistic Granular Base/Subbase Deformation Models • To be evaluated after Tasks II-IV

17. Future Research

18. Future Research Task II:Continue analysis of NAPTF trafficking response data for individual gear/wheel passes • Reduce data to actual sensor movement --Must subtract sensor readings from the exact same sensor reading of the anchors • Issue 1: matching the sensor records from the anchor to the other sensors • Issue 2: limited capabilities of Excel

19. NAPTF trafficking dynamic response Base/Subbase Contractive & Dilative Behavior

20. Future Research Task IV: Identify and evaluate deformation trends in the CC1 and CC3 test sections • Based on Task II results, identify and quantify the trends • Task III: Analyze NAPTF trafficking response data for pavement loading until failure • Based on Task IV results, analyze data for failure

21. Future Research Task V: Develop and Validate Realistic Granular Base/Subbase Deformation Models • Update Rutting model to include “normal” trafficking effects

22. Any Questions?