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HVS N12 test feedback RPF - 12 May 2005

HVS N12 test feedback RPF - 12 May 2005. N12 tests. Suite of tests on Emulsion treated material on Section 2, N12 (old S12 sections) Includes LTPP, laboratory, field, HVS Objectives: Collect current condition data (LTPP) Determine ultimate failure mechanism and traffic load

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HVS N12 test feedback RPF - 12 May 2005

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  1. HVS N12 test feedbackRPF - 12 May 2005

  2. N12 tests • Suite of tests on Emulsion treated material on Section 2, N12 (old S12 sections) • Includes LTPP, laboratory, field, HVS • Objectives: • Collect current condition data (LTPP) • Determine ultimate failure mechanism and traffic load • Calibrate SAMDM with long-term performance data

  3. Constructed in 1968 as CTB Premature failure Reconstructed in 1974 as ETB (1% res bitumen)

  4. Trafficking details • Final repetitions (29/4/2005) • 1 399 861 (22k 40 kN; 243k 80 kN; 1 134k 100 kN) • Initial traffic on sections • > 11.5 million E80s • Final HVS traffic (n=2; 4) • 8 MESA (70% of initial) • 48 MESA (420 % of initial) • Final total • 19.5 MESA (total of approximately 50 years) • 59.5 MESA (total of >> 50 years)

  5. Test Data • Permanent deformation • Very small • Elastic deflection • initial increase • small increasing trend • strong support (700 MPa) • Stiffness • Strong support • Others • surfacing lasted well

  6. Permanent Deformation (1) Water added Load increases

  7. Permanent Deformation (2) Load increases MDD failure after 950 000 reps due to water

  8. Permanent Deformation (3) Water added Load increases

  9. Elastic Deflection - RSD Load increases Water added

  10. Elastic Deflection – MDD Load increases MDD failure after 950 000 reps due to water

  11. Stiffness - Base

  12. Stiffness – Subbase (CTB) 1970 value = 1 650 MPa

  13. Stiffness – Upper subgrade (350 mm to 660 mm) 1970 value = 700 to 1 000 MPa

  14. Stiffness – Middle subgrade (660 mm to 900 mm) 1970 value = 700 to 900 MPa

  15. Stiffness – Lower subgrade(900 mm and deeper) 1970 value = 700 to 900 MPa

  16. Permeability CTB and BTB surfacings ETB surfacing and patch

  17. Permeability ETB Base

  18. Water phase • Water on surface caused stripping • Final phase of test with water added • Final condition – surfacing deteriorated • No failure in base

  19. Water phase

  20. Final condition

  21. Current conclusions • Good performance under a very high traffic load • Information will be used to calibrate the higher trafficked end of the SAMDM transfer functions for ETB pavements • No dramatic failures except when under high load wet test and mechanical damage • Potential benefits • Calibration data for ETB designs • Confirmation of deep structure / perpetual pavement concept

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