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Presentation-9 Proposed Research at the High Temperature Pavement Test Facility (HTPTF)

Presentation-9 Proposed Research at the High Temperature Pavement Test Facility (HTPTF) . Proposed Change to ICAO Tire Pressure Categories. Aircraft Tire Pressure Trends. Proposed X Category Limit. Current X Category Limit. Tire Pressure, bar. Need for HTPTF.

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Presentation-9 Proposed Research at the High Temperature Pavement Test Facility (HTPTF)

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  1. Presentation-9Proposed Research at the High Temperature Pavement Test Facility (HTPTF)

  2. Proposed Change to ICAO Tire Pressure Categories

  3. Aircraft Tire Pressure Trends Proposed X Category Limit Current X Category Limit Tire Pressure, bar

  4. Need for HTPTF • To develop new specifications for P-401 (based on gyratory compactor) and other HMA related projects, R&D has relied mostly on laboratory testing. Full-scale tests are needed so that the performance prediction models for HMA from laboratory tests can be validated/calibrated to the in-situ pavements. HTPTF WILL PROVIDE THAT CAPABILITY.

  5. Pavement Material Characterization Ground Water Table, Freeze-Thaw

  6. Pavement Materials - 10-Year R&D Plan

  7. Pavement Material Characterization • Current Material Requirements • Gradations • Compaction (Moisture/Density) • Volumetrics, stability, flow • CBR (for Subgrades) • Inputs for Design Procedure (current state) • Only CBR (for subgrades) • Subgrade modulus computed as E = 1500*CBR • No other mechanical property of unbound materials is used. • Modulus is calculated internally as a function of layer thickness and subgrade CBR. • AC modulus fixed at 200-ksi.

  8. Pavement Material Characterization • FAA advisory circulars lack guidance on the use of sustainable, environmentally friendly, recycled, and newer materials such as SMA, WMA, RAS, etc. • Limited knowledge is available on the effect of high tire pressures and heavy gear loads on pavement material performance under full-scale loading.

  9. Pavement Material Characterization • The cost of using better quality material to improve pavement performance (life) cannot be justified using current guidance. • Advances in pavement material testing techniques and knowledge gained in material behavior and characterization over the years is not used in the FAA pavement thickness design procedure.

  10. Need to Consider Realistic Material Behavior Develop inputs for design procedure based on mechanical properties of materials (such as resilient modulus, shear strength, etc.) Pavement Material Characterization

  11. Site Layout

  12. HTPTF-CC1 Objectives: Study the effects of Tire Pressure on performance of HMA layer. Study the effect of polymer modified binder on HMA layer performance. Evaluate the performance of Warm Mix Asphalt under aircraft wheel load.

  13. MATERIAL P401 HMA P401 HMA P401 HMA WMA WMA WMA 254 psi 254 psi 254 psi 254 psi 254 psi 254 psi TIRE PRESSURE 214 psi 214 psi 214 psi 214 psi 214 psi 214 psi BINDER TYPE PG 64-22 PG 76-22 PG 76-22 PG 76-22 PG 64-22 PG 76-22

  14. Future Research • “Green” technologies such as Warm Mix Asphalt • Stone Matrix Asphalt • Recycled Asphalt Pavement • Polymer Modified Binders • Shear failure of HMA

  15. Future Research • Performance of HMA overlays on • Flexible Pavements • Rigid Pavements

  16. Future Research Use of Additives and Nanoparticles to Improve Performance of Airport Pavement Materials Evaluate the use of Additives and Nanoparticles for Improved Performance of Airport Pavement Materials Develop Standards/Specifications and Guidelines for Pavement Materials that have been modified with Nanoparticles and other Additives.

  17. LABORATORY CHARACTERIZATION

  18. FULL SCALE APT

  19. Airport Technology R&D Branchhttp://www.airporttech.tc.faa.gov

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