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FAA Pavement R&D Program Update

FAA Pavement R&D Program Update. Acknowledgments. Staff @ NAPTF Satish Agrawal Gordon Hayhoe Robert “Murphy” Flynn Albert Larkin Navneet Garg David Brill Don Barbagallo. Consultants Roy McQueen Dick Ahlvin. Support Contractor – SRA Chuck Teubert Edward Guo May Dong Izydor Kawa

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FAA Pavement R&D Program Update

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  1. FAA Pavement R&D Program Update

  2. Acknowledgments • Staff @ NAPTF • Satish Agrawal • Gordon Hayhoe • Robert “Murphy” Flynn • Albert Larkin • Navneet Garg • David Brill • Don Barbagallo • Consultants • Roy McQueen • Dick Ahlvin • Support Contractor – SRA • Chuck Teubert • Edward Guo • May Dong • Izydor Kawa • Lia Ricalde • Injun Song • Quing Wang • Qingge Jia

  3. Outline • Introduction • FAARFIELD 1.3 – Pavement Design • ProFAA- Roughness Software • FEAFAA – Finite Element Analysis • PAVEAIR – New Web-Based Airport PMS • Flexible Pavement Full-Scale Tests (CC5) • Airfield Superpave Specifications • ASR Full Scale Testing Plan • Airport Technology Transfer Conference 2010

  4. Federal Aviation Administration Airport Technology R&D Program • Research conducted at the FAA William J. Hughes Technical Center, Atlantic City, NJ, USA. • Sponsor: FAA Office of Airport Safety and Standards (AAS100), Washington, DC. • Provide support for development of FAA pavement standards (Advisory Circulars). • http://www.airporttech.tc.faa.gov/

  5. New York Philadelphia Washington FAA Technical CenterAtlantic City, New Jersey Location of FAA Technical Center * Outline map of USA used by permission of the University of Texas Libraries, The University of Texas at Austin.

  6. National Airport Pavement Test Facility (NAPTF) FACTS: • Fully enclosed facility for accelerated traffic testing of airport pavements. • Full-scale pavement structures and landing gear loads with programmed wander. • Opened in 1999. • Total construction contract was $21M. • $14M from FAA • $7M from Boeing Co. under FAA/Boeing CRDA.

  7. NAPTF Construction Cycle (CC)

  8. Federal Aviation Administration Rigid and Flexible Iterative Elastic Layered Design Computer program for desktop PCs. Program preserves the “look and feel” of LEDFAA 1.3. Major changes are internal. Incorporates advanced structural models: 3-D finite element analysis for rigid pavements and overlays. NIKE3D (3D finite element analysis) INGRID (3D mesh generation) Layered elastic analysis (LEAF) for flexible pavements and overlays. FAARFIELD – What is it FAARFIELD

  9. FAARFIELD 1.3 • Computer program for desktop PCs. • Program preserves the “look and feel” of LEDFAA 1.3. • Major changes are internal. • Main program drives three subprograms: • LEAF (layered elastic analysis) • NIKE3D (3D finite element analysis) • INGRID (3D mesh generation)

  10. FAARFIELD 1.3Key Differences from LEDFAA 1.3 • Rigid Pavements/Overlays • Slab edge stresses are now computed directly using 3D-FEM. • Completely revised rigid pavement failure model. • Rewrote and improved rigid overlay design procedures. • Flexible Pavements/Overlays • Automatic base thickness design. • Supports HMA overlay design on rubblized PCC base. • General • Upgrade to MS Visual Basic.NET programming environment. • Aircraft library updated. • Improved runtime guidance based on AC 150/5320-6E. • New function allows user to export design data to XML. • Improved formatting for Notes. • All user options collected on one “Options” screen. • Improved Pass-to-Coverage ratio computation routine.

  11. FAARFIELD 1.3Additional Changes in Version 1.3 • Pavement thickness is now computed for constant tire contact area. • Changing the airplane gross weight causes the tire pressure to be adjusted to maintain the contact area. • External aircraft library in XML format. • Displays CDF values graphically. • Enhanced Airplane Data window now displays gear coordinates. • Support for PCC over rubblized base.

  12. FAARFIELD Workshops • FY08 Workshops: • London, UK (Nov. 1, 2007) • Allen, TX (Nov. 16, 2007) • Lima, Peru (Nov. 13, 2007) • Phoenix, AZ (TSW, April 21, 2008) • FY09 Workshops: • Singapore (Oct. 10, 2008) • Bellevue, WA (ASCE/ T&DI Pavement Conf. Oct 14, 2008) • Mexico City, Mexico (Oct. 30, 2008) • Amsterdam, Netherlands (CROW, May 12, 2009) • Champaign, IL (BCR2A, June 29, 2009) • Additional workshops to be announced.

  13. Profile Federal Aviation Administration ProFAA is the FAA’s computer program for computing pavement elevation profile roughness indexes. Straight Edge Boeing Bump International Roughness Index (IRI) California Profilograph (PI) RMS Bandpass Aircraft Simulation ProFAA – What Is It? ProFAA

  14. ProFAA - Pavement Roughness • Develop & Establish Standards for Measuring and Reporting Pavement Roughness • Determine Ride Quality within Cockpit and Cabin • PROFAA Workshops • 1st one - Phoenix, AZ (TSW, April 21, 2008) • Additional workshops to be announced • Assist in the Development of New Advisory Circular • Draft AC 150-5380-9 “Guidelines and Procedures for Measuring Airfield Pavement Roughness” • Issued July 28, 2008

  15. FEAFAA 1.1 Upgrades • Non-uniform mesh replaced by a uniform 3D mesh for PCC slabs. • This recognizes the need to obtain accurate responses at distances from the wheels, and allows moving wheel loads to be modeled more easily. • The uniform mesh size can be varied by the user within an appropriate range. • Gear can now be positioned arbitrarily with respect to the slab edges. • Slab self-weight is now included by default. • The maximum number of equilibrium iterations permitted before the stiffness matrix is reformed was increased. • The subroutine for setting penalty scale factors for sliding surfaces was changed. • Maintains correct contact surface shape (“gap”). • Improves the model accuracy in cases where slab/base separation occurs. • Airplane library was updated to agree with COMFAA & FAARFIELD. • New utility (NIKEPlot) allows interface with commercial post processing software (e.g. TecPlot).

  16. FEAFAA 1.10 Screen Shots Airplane Selection Pavement Structure Joint Modeling 3D Mesh Generation

  17. FEAFAA 1.10 Plots 3D-FEM Mesh Showing 6-Wheel Gear Occupying 4 Slabs Contours of Stress in x-Direction (Top of Slab)

  18. PAVEAIR-Web-Based Airport PMS • Background • A joint initiative between the FAA and the National Association of State Aviation Officials (NASAO) to develop a system for sharing information to optimize the expenditure of funds. • An Internet (Web) based system was deemed to be the best option considering the mature status of web-based applications. • The FAA also has a need for system-wide dissemination and analysis of the performance of FAA sponsored pavement projects. • A collection of airport pavement design and evaluation computer programs has also been developed and a dedicated PMS software application would tie these programs together.

  19. PAVEAIR • Program Requirements • Web-based application that provides a system for easy dissemination of information for airport pavement construction, maintenance, and management. • Data for multiple airports available on a single server connected to the web • Suitable for installation and use on: • Single PC • Private network • Intranet or Internet. • The FAA to host a server installed at the WJHTC to be a repository for civil airport projects funded under the Airport Improvement Program (AIP). • Make the complete application available for free download: • As a set of installation files. • Full source code. • Documentation for installation and operation.

  20. PAVEAIR Architecture Workstations Server DENJFKDCA… Disk Drive(s)

  21. PAVEAIR System Databases Import Databases User Databases Database Architecture

  22. PAVEAIR Current Status– Subject to Testing and Reviews • Prototype User Interface and master page template completed. • Database structure defined and implemented. • Micro PAVER import completed. • Logon and profile modules completed. • Inventory and Work modules completed. • Now working on the PCI module. • Tentative first deployment – January, 2010.

  23. PAVEAIR

  24. PAVEAIR • Possible Implementations • By the FAA for AIP projects. • By FAA regions for small airports. • By state DOT’s for GA airports (NASAO interest). • By consulting and engineering services companies for private or customer only access. • Will continue support and development after initial deployment; for example include functions to comply with existing FAA GIS Standards.

  25. BAKFAA Strength Evaluation FAARFIELD Thickness Design PAVEAIR Web-Based PMS ProFAA Roughness Condition Evaluation COMFAA PCN Load Rating Integration of FAA Software

  26. Flexible Pavement Full-Scale TestsConstruction Cycle 5 • Purpose • Multiple-gear interaction on low-strength subgrade. • Performance of different quality subbase materials. • History • Construction Completed: July 14, 2008 • Started Loading: August 14, 2008 • Increased wheel load from 50k to 58k: October 7, 2008 • Cold Weather Shut Down: November 12, 2008 • Passes to Date: 12,276

  27. CC5 Full-Scale Test Plan & Profile CURRENTLY BEING TESTED CL Landing Gear Proximity Tests Subbase Quality Tests

  28. Construction Cycle 5 Improved Subbase Improved Subbase 10-Wheel 6-Wheel 6-Wheel 10-Wheel

  29. Airfield Superpave Specifications • Purpose • Establish Ndesign for P- 401, Plant Mix Bituminous Pavement. • Revise P-401 Specifications using the Superpave Gyratory Compactor. • Run verification testing on a variety of well performing HMA mixes. • In parallel with and complimentary to an FAA sponsored study being performed by ERDC at WES.

  30. Airfield Superpave Specifications • Testing Plan • Phase 1 • Testing “Well Performing Mixes” • 8 “well performing mixes” were identified • Keeping same air voids as Marshal JMF • Phase 2 (Future Tests) • Evaluate effects of variations in binder content on mix performance • Rut resistance • Fatigue resistance • Other performance related properties • SRA International, Inc. • Subcontractors • Advanced Asphalt Technology • Soiltek • Roy D. McQueen & Associates

  31. Airfield Superpave Specifications • Well performing Mixes

  32. Airfield Superpave Specifications Ndesign Summary

  33. Airfield Superpave Specifications

  34. 15’-0” TYP W/C =0.55 Air Entrainment = 0% Fly Ash = 0% Thickness = 12” W/C =0.55 Air Entrainment = 4.0% Fly Ash = 0% Thickness = 12” W/C =0.55 Air Entrainment = 0.0% Fly Ash = 30% Thickness = 12” 15’-0” TYP ASR Full Scale Testing CONTROL • 3 Slabs 15’ x 15’ 12” thick • Indoor and outdoor • Aggregates – NC Argillite •High Alkali cement Type I • 30% fly ash •High W/C ratio (0.55) • Deicer – Potassium Acetate

  35. ASR Full Scale Testing • Monitoring Plan • Physical Expansion • Dynamic Modulus of Elasticity (DME) • Petrographic Examination every 6 months • Sulfate Concentrations • Mortar Bar Tests • Visual Inspection

  36. Airport Technology Transfer Conference 2010 Location: Atlantic City, NJ Date: April 2010

  37. QUESTIONS CONTACT: JEFFREY.GAGNON@FAA.GOV WEBSITE: WWW.AIRPORTTECH.TC.FAA.GOV

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