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Characterization of Permanent deformation

Characterization of Permanent deformation. Mondher Neifar, Hervé Di Benedetto, Berthe Dongmo. NABin Conferense - 26. october 2004. Berthe-Julienne DONGMO-ENGELAND. …. 1980. 1960. 1950. 1990. 1970. The problem is solved. Apparition of rutting. Rutting reappears.

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Characterization of Permanent deformation

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  1. Characterization of Permanent deformation Mondher Neifar, Hervé Di Benedetto, Berthe Dongmo NABin Conferense - 26. october 2004 . Berthe-Julienne DONGMO-ENGELAND

  2. … 1980 1960 1950 1990 1970 The problem is solved Apparition of rutting Rutting reappears Rutting in France: milestones • Evolution in the production of bitumen • Evolution of axle loads configuration

  3. 15 to 50 cm Arase de terrassement Couches de surface Plate –forme support de chaussée Accotement Roulement Liaison Base Couches d’assise Fondation Couche de forme 1m Partie supérieure des terrassements Sol support Origins of rutting in bituminous roads Bituminous layers Unbound layers

  4. Aim • Homogeneous test • rheological model • Measure both “large” (10-2) permanent deformation and “small” (10-6) cyclic deformation • complex modulus

  5. Test developed Triaxial test on bituminous mixes h=12cm d=8cm

  6. Test developed Triaxial test on bituminous mixes • High resolution • A mechanical system to move axial targets • Temperature regulation

  7. Stress path history

  8. s s max t Type of loading Cycles & rest periods

  9. 1 Possible to obtain Complex modulus Experimental Great strain evolution Cycle N & N+1 0<t<2p/fr

  10. s s max t Cyclic loading periods Rest periods Experimental Stress Time (s) Compression and tension type tests T = 25°C; smax = 0,4 Mpa; f = 1Hz

  11. Strain-number of cycles 0.3% Cumulated number of cycles Experimental T = 25°C; smax = 0,4 Mpa; f = 1Hz T = 25°C - f = 1 Hz smax = 0,4 MPa

  12. s s max t Phase I Phase III Phase II Small strain measured Experimental General curve for continuous loading T = 35°C; smax = 0,4 Mpa; f = 1Hz Information in the linear domain (LVE)

  13. Tests • 0/14 Bituminous mixes • 35/50 bitumen at 6.8 ppc

  14. Results

  15. Stress Time (s) VEL or classical VP laws not adapted Experimental Influence of frequency T = 25°C smax = 0,4 MPa

  16. Experimental Tests in compression

  17. Phase 3 enorm = 58.59N0.1951 Frequency Temperature Stress level Experimental Cyclic compression tests Type : e = f(N) e0 deperm= f(sjmax)

  18. Traction Compression Volume variation Compression Tension

  19. Complex modulus evolution f = 1Hz smax = 0,4 MPa

  20. Conclusion • New test • Permanent deformation • Small cycle properties • Results for compression and extension tests • Classical laws not adapted • Cyclic effect • Suitable developments • Prediction

  21. THANK YOU

  22. Modelling

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