MSCR Method, Testing & Analysis

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Background to Multiple Stress Creep Recovery for AASHTO TP-70 & ASTM M320

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MSCR Method, Testing & Analysis

  1. 1. Multiple Stress Creep Recovery A review of the technology, test set up and analysis. Presenter: John Casola, Asphalt Market & Products Manager
  2. 2. Outline <ul><li>Selected excerpts from the recent Binder ETG </li></ul><ul><ul><li>Paper by John D’Angelo & Raj Dongre’ providing background of the method. Discussion of the relationship to Rutting & Elastic Recovery </li></ul></ul><ul><li>Specifics of the testing procedure </li></ul><ul><ul><li>Multiple Stress Creep Recovery </li></ul></ul><ul><li>How to set up and perform the testing </li></ul><ul><ul><li>Understanding the test & results </li></ul></ul><ul><ul><ul><li>Creep and Creep Recovery </li></ul></ul></ul><ul><ul><ul><li>Analysis </li></ul></ul></ul>
  3. 3. Selected Excerpts from the Binder ETG
  4. 4. Overview of the premise: By: John D’Angelo & Raj Dongre’
  5. 7. Relationship <ul><li>Modulus </li></ul><ul><li>Stress </li></ul><ul><li>G = --------- </li></ul><ul><li>Strain </li></ul><ul><li>Compliance </li></ul><ul><li>Strain </li></ul><ul><li>J = --------- </li></ul><ul><li>Stress </li></ul>
  6. 20. Procedures are available for use from both ASTM & AASHTO
  7. 21. Testing Procedure
  8. 22. Multiple Stress Creep Recovery (MSCR) <ul><li>Applied Stress 100Pa for a 1 second Creep period </li></ul><ul><li>Remove the Stress for a 9 second Recovery period </li></ul><ul><li>Repeated for a total of 10 cycles </li></ul><ul><li>Applied Stress 3200Pa for a 1 second Creep period </li></ul><ul><li>Remove Stress for a 9 second Recovery period </li></ul><ul><li>Repeated for a total of 10 cycles </li></ul><ul><li>Goal it investigate differences in linear & non-linear performance of the binder. </li></ul>
  9. 23. Applied Stress Loading
  10. 24. Accumulated Strain from Repeated Loading
  11. 25. Accumulated Strain from Repeated Loading on a Modified Binder
  12. 26. Example of a Newtonian material Neat binder PG64-28 tested to MSCR at 64 o C Jnr 3200 Jnr 100
  13. 27. Example of a Visco-Elastic Binder Modified binder PG70-28 tested to MSCR at 70 o C 100Pa 3200Pa Jnr 3200 Jnr 100
  14. 28. Neat Binder; Max Strain ~60% PG 64-28 at 100Pa
  15. 29. Neat Binder; Max Strain ~2000% PG 64-28 at 3200Pa
  16. 30. Polymer Modified Binder; Max Strain ~30% PG 70-28 at 100Pa
  17. 31. Polymer Modified Binder; Max Strain +700% PG 70-28 at 3200Pa
  18. 32. Calculations
  19. 33. Reporting
  20. 34. Setting Up Malvern Software
  21. 35. Creep / Creep-Recovery Mode
  22. 36. Create Creep/Creep Recovery <ul><li>100Pa; 25mm plates </li></ul><ul><ul><li>Repeat 9 times </li></ul></ul><ul><ul><li>1 Sec Creep Time </li></ul></ul><ul><ul><li>Linear </li></ul></ul><ul><ul><li>10 Data points </li></ul></ul>
  23. 37. Creep Un-check Default sampling Set to 100 Set to 1 Click to Linear Set to 1 Set to 10 for every 0.1s
  24. 38. Recovery Un-check Default Sampling Click to Linear Set to 9 Set to 20 for every 0.45s Perform Recovery
  25. 39. Temperature
  26. 40. Temperature
  27. 41. Temperature Options Un-Check All
  28. 42. No of Repeats
  29. 43. Save the Parameter File as ‘100pa’
  30. 44. Create Creep/Creep Recovery <ul><li>3200Pa; 25mm plates </li></ul><ul><ul><li>Repeat 9 times </li></ul></ul><ul><ul><li>1 Sec Creep Time </li></ul></ul><ul><ul><li>Linear </li></ul></ul><ul><ul><li>10 Data points </li></ul></ul>
  31. 45. Change Creep Stress to 3200 Just change to 3200
  32. 46. Save the Parameter as 3200pa
  33. 47. Job Stream Icon for Test Sequencing
  34. 48. Add the saved Parameter Files to Script Give it the name MSCR
  35. 49. Run the Test
  36. 50. Or, Save Script to Add on User Page
  37. 51. Add to User Page
  38. 52. Or, link to another test for automated testing
  39. 53. In Conclusion <ul><li>Expect to see the specification released in the next 12 months. </li></ul><ul><li>For any questions, feel free to call or email me or the Malvern Help Desk for any assistance. </li></ul><ul><li>In the USA +1 508-480-0200 x 350 </li></ul>
  40. 54. Thank you for your interest & time! Contact information <ul><li>Presenter: </li></ul><ul><ul><li>John Casola (US based) </li></ul></ul><ul><ul><li>(+1) 973-740-1543 </li></ul></ul><ul><ul><li>[email_address] </li></ul></ul><ul><ul><li>US Helpdesk: (+1) 508 480 0200 </li></ul></ul><ul><li>Thank you for joining us!!! </li></ul><ul><ul><li>An audio recording of this presentation will be available on the Malvern website soon. Check back with us regularly for future relevant seminars! </li></ul></ul><ul><ul><li>www.malvernevents.com On-Demand Presentations </li></ul></ul>

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