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CUPGA - CTAA SMA in Québec

CUPGA - CTAA SMA in Québec. D. Perraton, M. Meunier and M. Paradis (MTQ) LUCREB / ÉTS November 2004. LUCREB. Laboratoire Universitaire - Chaussées Routes et Enrobés Bitumineux. Summarize. L U C R E B. 1. SMA history in Québec On going project : MTQ-LUCREB

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CUPGA - CTAA SMA in Québec

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  1. CUPGA - CTAA SMA in Québec D. Perraton, M. Meunier and M. Paradis (MTQ) LUCREB / ÉTSNovember 2004 LUCREB Laboratoire Universitaire - Chaussées Routes et Enrobés Bitumineux

  2. Summarize L U C R E B • 1. SMA history in Québec • On going project : MTQ-LUCREB • Phase I : Production investigation – Test road I • Mixes stability evaluation • In site compaction efficiency • Phase II : SMA used in thin overlay – Test road II • Reflective cracking in overlay • Conclusions Perraton, Meunier, Paradis

  3. History of SMA in Québec L U C R E B • First try of SMA mix in Québec have been donein 1990… first application in the North America • MÉDIFLEX used in overlay • During 5 years many test roads were done … The last project was 18 km long! • A major reform in the Asphalt mix formulationapproach in Québec, delay the implementationprocess of SMA • 2001 – 2004, MTQ, in collaboration with theLUCREB-ÉTS, start a project on SMA formulation Perraton, Meunier, Paradis

  4. On going project : MTQ – LUCREB L U C R E B • Targets : • Define SMA specification in accordance to the LCformulation approach a Define the Vbe a Define de NDesign a In site compaction measurement under paving operation • Evaluate SMA performance to preventreflective cracking in overlay a SMA application over a damage road structure Perraton, Meunier, Paradis

  5. Phase I : Production investigation – Test road I L U C R E B • Production stability of the SMA-mixes • Sampling on site • Site description • Characteristics SMA-mix • Compaction efficiency • Production stability of the SMA-mix • Laboratory investigation Perraton, Meunier, Paradis

  6. Phase I : Production investigation – Test road I - Laboratory investigation L U C R E B • RESULTS • SGC results • Coarse aggregate content • Filler content • Bitumen content Perraton, Meunier, Paradis

  7. Phase II : SMA used in thin overlay – Test road II L U C R E B • A test road have been done on the Highway 20, East direction (Québec area) • Characteristics SMA-mix • Site description • Reflective cracking results after 2 years Perraton, Meunier, Paradis

  8. 10mm GNM SMA 10mm GNM SMA Max Max Discontinuity 2,5 5mm On going project : MTQ – LUCREBConclusions L U C R E B • To formulate properly a 10mm NMAS SMA-mix,a discontinuity on the aggregate grading isrequired to avoid over dosage of filler • An optimal dosage of filler (passing 80 mm)must be target in the SMA-mix formulation Perraton, Meunier, Paradis

  9. On going project : MTQ – LUCREBConclusions L U C R E B • The dosage of raw materials must be well controlled on production within the followingwindows Perraton, Meunier, Paradis

  10. TIMING! On going project : MTQ – LUCREBConclusions L U C R E B • As far as we are concerned, the NDesign value(60 gyrations) is an appropriate target for in site thin layer application( layer : 30 to 50 mm) • Nevertheless, T°C of the mixfor paving operationmust be strongly respected • Also, the production process must be adapted: • Constant Feeding • More aggressive compaction process Perraton, Meunier, Paradis

  11. L U C R E B Thank you Perraton, Meunier, Paradis

  12. History of SMA in Québec Mix characteristics – Médiflex Formulation L U C R E B Perraton, Meunier, Paradis

  13. 0 -2,5 mm! Phase II : SMA used in thin overlay – Mix characteristics - Formulation L U C R E B Perraton, Meunier, Paradis

  14. Phase II : SMA used in thin overlay – Mix characteristics - Grading L U C R E B Perraton, Meunier, Paradis

  15. Phase II : SMA used in thin overlay – Mix characteristics – Rutting performance L U C R E B Perraton, Meunier, Paradis

  16. T1 Phase II : SMA used in thin overlay – Mix characteristics - TSRST L U C R E B Tg Perraton, Meunier, Paradis

  17. Phase II : SMA used in thin overlay –Mix characteristics – Complex modulus L U C R E B Perraton, Meunier, Paradis

  18. Phase II : SMA used in thin overlay – Test road site description L U C R E B • The test sections selected to evaluate theability of SMA-mix to delay the reflectivecracking in overlay was strongly damage • Test road section was splits into 15 sub-sections Perraton, Meunier, Paradis

  19. Phase II : SMA used in thin overlay – Test road site description L U C R E B • Pictures were taken for all sub-sectionsand the detail of the cracking network were drawnon a sheet to follow up the reflective crackingactivities Perraton, Meunier, Paradis

  20. In direction of the way Wheel Tracks Transverse Out ofWheel Tracks Phase II : SMA used in thin overlay – Reflective cracking after 1 and 2 years L U C R E B • To analyse SMA-performance, the cracking network of all sub-sections was quantifiedin accordance to 3 specific modes of crackingas define by MTQ Perraton, Meunier, Paradis

  21. Phase II : SMA used in thin overlay – Reflective cracking after 1 and 2 years L U C R E B • Cracks in longitudinal side of the road • Cracks in the wheel tracks • Cracks outside the wheel tracks • Cracks in the transversal side of the road Perraton, Meunier, Paradis

  22. 350,00 300,00 250,00 200,00 Cracking rate (mm/m²) 150,00 100,00 50,00 0,00 section Phase II : SMA used in thin overlay – Cracking - Transversale L U C R E B After 1 year Before Overlay After 2 years Perraton, Meunier, Paradis

  23. 350,00 300,00 250,00 Cracking rate (mm/m2) 200,00 150,00 100,00 50,00 0,00 section Phase II : SMA used in thin overlay – Cracking - In the wheel tracks L U C R E B After 1 year Before Overlay After 2 years Perraton, Meunier, Paradis

  24. 600,00 500,00 400,00 Cracking rate (mm/m²) 300,00 200,00 100,00 0,00 section Phase II : SMA used in thin overlay – Cracking – Outside the wheel tracks L U C R E B After 1 year Before Overlay After 2 years Perraton, Meunier, Paradis

  25. Transversale In wheeltrack Out wheeltrack Phase II : SMA used in thin overlay – Status L U C R E B Perraton, Meunier, Paradis

  26. Phase I : Production investigation – Mix characteristics - Formulation L U C R E B Perraton, Meunier, Paradis

  27. SPEC VMA i Phase I : Production investigation – Mix characteristics - Grading L U C R E B Aggregates 0-5 mm ? Aggregates 0-2,5 mm Discontinuity …Filler i to fill up voids! Perraton, Meunier, Paradis

  28. Phase I : Production investigation – Mix characteristics – Rutting performance L U C R E B Perraton, Meunier, Paradis

  29. PG70-28 PG58-28 Tg T1 Phase I : Production investigation – Mix characteristics - TSRST L U C R E B Perraton, Meunier, Paradis

  30. Phase I : Production investigation – Mix characteristics – Complex modulus L U C R E B Perraton, Meunier, Paradis

  31. Phase I : Production investigation – Test road site description L U C R E B Production investigation have been done ona new construction project Highway : High volume of trafic Test road length of 200 meters A production of 300 t of SMA-mix for the test road Perraton, Meunier, Paradis

  32. Phase I : Production investigation – SMA-mix Production : Sampling on site L U C R E B • On site sampling have been done at two differentplaces : • At the mixing plant • At the paving site – Directly in the paver Perraton, Meunier, Paradis

  33. Phase I : Production investigation – SMA-mix Production :Sampling at the mixing plant L U C R E B • In purpose to well characterize the SMA-mixperformance in laboratory, one specific batchwas produced at the mixing plant • 3 700 kg of asphalt 150 boxes were sampled Perraton, Meunier, Paradis

  34. Phase I : Production investigation – SMA-mix Production :Sampling at the paving site L U C R E B • For each unloading truck in the paver,a sample of 20 kg of material was taken • 15 trucks were sampled 50 boxes were sampled Perraton, Meunier, Paradis

  35. Phase I : Production investigation – SMA-mix Production : Lab Investigation L U C R E B • Samples taken directly in the paver,were used to quantify production stability • Each samples were submitted to a seriesof test …for each truck load • SGC test (compaction behavior of the mix) • Bitumen content (Ignition oven) • Filler content (Water wash seaving analysison the dried part of the ignition burn) • Coarse aggregate content (particles retained5 mm sieve) Perraton, Meunier, Paradis

  36. Upper Limit Lower Limit Phase I : Production investigation – SMA-mix Production : Coarse aggregate content L U C R E B Perraton, Meunier, Paradis

  37. Mean Value 7,0% Upper Limit +/- 1,25% Lower Limit Phase I : Production investigation – SMA-mix Production : SGC results L U C R E B Perraton, Meunier, Paradis

  38. Upper Limit Lower Limit Phase I : Production investigation –SMA-mix Production : Bitumen content L U C R E B Perraton, Meunier, Paradis

  39. OPTIMAL DOSAGE! Take care : To much …will increase voids ! Phase I : Production investigation – SMA-mix Production : Filler content L U C R E B Increasing the filler amount Air voids i Lab test results Indicate +/- 1% is acceptable workability improvement Perraton, Meunier, Paradis

  40. Upper Limit Lower Limit Phase I : Production investigation – SMA-mix Production : Filler content L U C R E B Perraton, Meunier, Paradis

  41. Phase I : Production investigation – Compaction efficiency L U C R E B • In purpose to validate the Ndesign– value,fixed at 60 N for the SGC-test,we follow up the compaction processunder paving operations • Just after the first pass of compaction, followingthe paving operation, a paint mark was done onthe surface • A first set of density measurements with anuclear density gauge was recorded • For each additional roller pass, the density of the mix was measured again Perraton, Meunier, Paradis

  42. Target Phase I : Production investigation – Compaction efficiency L U C R E B Localisation Perraton, Meunier, Paradis

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