1. 1 Truck-Pavement Interaction Research Program Tire Study International Workshop on the Use of Widebase Tires October 25-26, 2007 FHWA TFHRC

2. Federal Highway Administration Truck Pavement Interaction 2 Phase IDynamic Effects Phase IIPressure/Footprint/ANN Phase IIIHot Weather Shear Phase IVAccelerated Loading TTA C.4 Tire/Pavement Effects

3. Federal Highway Administration Truck Pavement Interaction 3 3D Tire Pressure Tests “South African Vehicle-Road Surface Pressure Transducer Array (VRSPTA)”3D Tire Pressure Tests “South African Vehicle-Road Surface Pressure Transducer Array (VRSPTA)” 1D Tire Pressure Tests “Kistler MODULUS Quartz Sensor Array”1D Tire Pressure Tests “Kistler MODULUS Quartz Sensor Array” Artificial Neural Network model for bias and radial tires (ANN)Artificial Neural Network model for bias and radial tires (ANN) Phase II - Tire Pavement Interface Pressure Patterns (TPIPP) TTA C.4 (Cont.)

4. Federal Highway Administration Truck Pavement Interaction 4 3D Tire Pressure Print Tests TTA C.4 (Cont.) Phase II - TPIPP

5. Federal Highway Administration Truck Pavement Interaction 5 ANN Tire Model TTA C.4 (Cont.) Phase II - TPIPP

6. Federal Highway Administration Truck Pavement Interaction 6 3D VRSPTA Measurement TTA C.4 (Cont.) Phase II - TPIPP 3D ANN Model Prediction

7. Federal Highway Administration Truck Pavement Interaction 7 1D Tire Pressure Print Tests TTA C.4 (Cont.) Phase II - TPIPP

8. Federal Highway Administration Truck Pavement Interaction 8

9. Federal Highway Administration Truck Pavement Interaction 9 Phase III - Hot Weather Shear – LTPP SPS-8 Ohio Test Road Two Asphalt Concrete thicknessesTwo Asphalt Concrete thicknesses Unique instrumentation of embedded gages to measure vertical shear and temperature with depthUnique instrumentation of embedded gages to measure vertical shear and temperature with depth Three speeds, three tire inflation pressures, dual and wide-base tiresThree speeds, three tire inflation pressures, dual and wide-base tires FHWA Test Truck measures Road Profile and Dynamic Wheel ForcesFHWA Test Truck measures Road Profile and Dynamic Wheel Forces TTA C.4 (Cont.)

10. Federal Highway Administration Truck Pavement Interaction 10

11. Federal Highway Administration Truck Pavement Interaction 11 JPCP N WHOH! WHOH! WHOH! WHOH! AC 8” 4” Ohio SHRP LTPP SPS-1, 2 & 8

12. Federal Highway Administration Truck Pavement Interaction 12 Strain Gage Rosette Configuration on Square Holes

13. Federal Highway Administration Truck Pavement Interaction 13 Wide Base (G286 & MXDA) Dual (G159 & MXZA2) Test Series Speed (mph) Tire Inflation Pressure (psi) Test Series Speed (mph) Tire Inflation Pressure (psi) 157010570 22570112570 35570125570 45100135100 5251001425100 6551001555100 75120165120 8251201725120 9551201855120 Test Run Series

14. Federal Highway Administration Truck Pavement Interaction 14

15. Federal Highway Administration Truck Pavement Interaction 15

16. Federal Highway Administration Truck Pavement Interaction 16 Other Data and Tests… Weather StationWeather Station FWDFWD Surface Profile & Truck DynamicsSurface Profile & Truck Dynamics Material CharacterizationMaterial Characterization –Creep –Relaxation –Triangular Load

17. Federal Highway Administration Truck Pavement Interaction 17 TPI Tire Testing Status TTA C.4 (Cont.)

18. Federal Highway Administration Truck Pavement Interaction 18 Test Tires: TTA C.4 (Cont.) Phase IV - Accelerated Loading Goodyear DualG159A(295/75R22.5) Goodyear S.S. G286(425/65R22.5) Michelin Dual MXZA2(275/80R22.5) Michelin S.S.MXDA(495/45R22.5)* * Prototype

19. Federal Highway Administration Truck Pavement Interaction 19 Test Matrix TTA C.4 (Cont.) Phase IV - Accelerated Loading