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MODELS FOR PERMANENT DEFORMATION FOR BITUMINOUS BOUND MATERIALS IN FLEXIBLE PAVEMENTS Modelling

MODELS FOR PERMANENT DEFORMATION FOR BITUMINOUS BOUND MATERIALS IN FLEXIBLE PAVEMENTS Modelling. Test programme (Vienna-meeting) Specimens from LAVOC Models Modelling Calibration Data from test tracks Further Steps Discussion and Questions. OUTLINE. Test programme WP5. Open file:.

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MODELS FOR PERMANENT DEFORMATION FOR BITUMINOUS BOUND MATERIALS IN FLEXIBLE PAVEMENTS Modelling

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  1. MODELS FOR PERMANENT DEFORMATION FOR BITUMINOUS BOUND MATERIALS IN FLEXIBLE PAVEMENTS • Modelling SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  2. Test programme (Vienna-meeting) Specimens from LAVOC Models Modelling Calibration Data from test tracks Further Steps Discussion and Questions OUTLINE SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  3. Test programme WP5 Open file: SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  4. Specimens from LAVOC 45cm 80cm 40mm 2x90mm threads SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  5. Specimens from LAVOC: cutting scheme Problems: threads in corners lateral surfaces non-planar bonding between layers 1/1 1/2 6/1 2/1 2/2 3/1 6/2 3/2 1/1 2/1 5/1 5/2 Plate 1 Plate 2 Plate 3 Plate 5 Plate 6 LCPC (large size) ISTU (uniaxial and triaxial testing) DRI (small size, B in water) SHELL (NAT) TRL (cores, B in air) broken SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  6. MODELS for validation • SPDM • Francken (?) • Huet - Sayegh • Burger • Power Law • Generalized Maxwell • DBN (?) • rutting prediction model • material model • rheological models SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  7. Ea J0 Ep a, ka J1, m b, hb Power Law Huet – Sayegh model Burger model Generalized Maxwell model G1 G2 Gn G0  t1 t2 tn 1 E1 E2 2 RHEOLOGICAL MODELS SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  8. G1 G2 Gn K0 G0  t1 t2 tn MODELLING: Rheological models Stress tensor volumetric part deviatoric part rheological model rheological model Linear elastic model Generalized Maxwell model constitutive equations constitutive equations FE - code SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  9. CALIBRATION lab tests determination of test parameters data fitting determination of model parameters FE - code simulation of loaded structure wheel tracking test simulation SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  10. Determination of Test Parameters from Lab Tests • Hydrostatic tests: • axial pressure = confining pressure • - static • - dynamic (sinusoidal load) • Deviatoric tests: • confining pressure = 0 (uniaxial) • - static • - dynamic (sinusoidal load) • Determination of test parameters: E*,  SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  11. Determination of Model Parameters from Data Fitting • Lab tests • E* and  for various T and f example: data fitting for Huet-Sayegh model SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  12. Determination of Model Parameters from Data Fitting • Lab tests • E* and  for various T and f • Cole-Cole-Diagram for Huet – Sayegh model Model parameters: Ea, Ep, ka, hb • 20°C 10°C 0°C -10°C example: data fitting for Huet-Sayegh model SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  13. Data from test tracks • Lausanne, ALT at LAVOC • Test track Denmark • LCPC, Nantes test track, historical data • missing data SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  14. MATERIALS: data from Denmark Open file: SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  15. FURTHER STEPS SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  16. OPEN QUESTIONS • Test track data: list with required data will be sent to LCPC and DRI • Material Denmark: sample preparation ? • Francken model: determination of test parameters ? • DBN: 3D-version not published – time? • Viscosity data: • which type of test used? • SPDM-software: only for modified bitumen SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  17. Thank You for Your attention! P.S.: Where is our MONEY??? SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  18. Francken / Key equations p... plastic deformation 1... amplitude of vertical stress 3... lateral stress Ep... plastic deformation modulus N... number of load repetitions f... load frequency f()... coefficient, dependent on the void content E*... complex elastic modulus • Key equations: • E∞... purely elastic or „glassy“ modulus • R*... reduced modulus • T... temperature • VA... aggregate content [Vol %] • VB... binder content [Vol %] • F*... reduced shear modulus (binder) SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  19. Francken / Input parameters • Input parameters for the model: • Complex elastic modulus E* • Complex shear modulus G* of the binder • Aggregate content [vol. %] • Binder content [vol. %] Triaxial test DSR and vol. asphalt characteristics SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  20. SPDM / Key equations • Key equations: Smix,v Stiffness of the mix Sbit,v Viscous component of the stiffness of the bituminous binder b, q... Parameters, specific for a certain asphaltic mix, determined by creep tests 0... Bitumen viscosity at the average paving temperature Weq... ESALs tw... Wheel loading time (traffic speed) h... Rut depth k... Coefficient k=CmZ0, dynamic factor Cm= 1 by default Z0... Configuration factor 0... Contact stress of the standard wheel av,0...Average stress in the asphalt layer resulting from one standard wheel pass h... Thickness of the asphalt layer SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  21. SPDM / Input parameters • Input parameters for the model: • Traffic: axle loads, wheels per axle, axles per day and line, contact stress, rate of traffic growth per year, design period, loading time • Climate: MMAT (Mean Monthly Air Temperature in °C) • Material characteristics: penetration of the bitumen at 25°C, softening point of the bitumen, polymer modified bitumens: viscosities at two temperatures, mix composition (Vol.% bitumen, Vol.% aggregate), creep characteristics (parameters q and b) • Structure: total thickness of asphalt layers, thickness of sub-base, Poisson’s ratio of asphalt layers, of the sub-base and of the subgrade, modulus of elasticity of the sub-base and the subgrade SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  22. Uniaxial and Triaxial Tests • Creep tests • The applied axial load is constant, so that specimen failure does not result from sudden load pulses. Most of these tests are run in compression states of stress. • Repeated Load Tests • A block pulse waveform that is not symmetric is applied to the specimen. One load cycle contains a load period and a rest period. • Cyclic Load Tests • Axial symmetric load curves are applied to the test specimen. Tests can be run in tension-compression as well as in compression only. SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  23. Test Types / Uniaxial and Triaxial Tests creep repeated load cyclic load SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  24. MATERIALS: Data from ALT in Lausanne SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

  25. MATERIALS: ALT in Lausanne/ surface layer SAMARIS – Presentation Modelling– WP5 Meeting Wokingham, UK – 02/03/05

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