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Long-Life Pavements Concepts and Lab Testing

Long-Life Pavements Concepts and Lab Testing. Pre-bid Meeting Solano 80 04-4A0104 James M. Signore Oakland, CA 9/14/2012. Presentation Overview. Long Life Pavement (LLP) What it is? What are the benefits? Recent California Experience I-5 in Red Bluff and Weed What to Anticipate

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Long-Life Pavements Concepts and Lab Testing

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  1. Long-Life PavementsConcepts and Lab Testing Pre-bid Meeting Solano 80 04-4A0104 James M. Signore Oakland, CA 9/14/2012

  2. PresentationOverview • Long Life Pavement (LLP) • What it is? • What are the benefits? • Recent California Experience • I-5 in Red Bluff and Weed • What to Anticipate • Specimen Preparation & Lab Testing

  3. Long Life Pavement – What is it? Design Life 40+ years Bottom-Up Design and Construction Renewable Pavement Surface High Rutting and Cracking Resistance Smooth and Safe Driving Surface

  4. Long Life Pavement – What is it? Leads to Fatigue Cracking Repeated Bending Repeated Deformation Leads to Rutting HMA Base Subgrade

  5. Long Life Pavement What are the Benefits? Lower Life Cycle Cost Better Use of Resources Low Incremental Costs for Surface Renewal Lower User Delay Cost Fewer or Shorter Work Zone Periods for Future Maintenance

  6. Long Life Pavements in the US

  7. Structural Section – SOLANO 80 OGFC  HMA w/ 15% Max. RAP (PG 64-28PM)  HMA w/ 25% RAP (PG 64-10) Geosynthetic Interlayer Leveling Course Existing Pavement 2 Mix Designs!!!

  8. Project Considerations • Materials Selection & Testing • Structural Design • Specs • Construction

  9. Recent Projects • Weed I-5 D2 • Red Bluff I-5 D2

  10. Structural Section – Weed  HMA w/ 15% Max. RAP (PG 64-28PM) HMA w/ 25% RAP (PG 64-16)  SAMI* HMA w/ 25% RAP (PG 64-16) (leveling course) Existing Cracked & Seated PCC or HMA 2 Mix Designs!!! * Asphalt Rubber Seal Coat NTS

  11. Structural Section – Red Bluff OGFC  HMA w/ 15% Max. RAP (PG 64-28PM)  HMA w/ 25% RAP (PG 64-10)  HMA-Rich Bottom (PG 64-10) CTB-Existing 3 Mix Designs!!! AggSubbase & Subgrade NTS

  12. What to Anticipate Solano 80

  13. Mix Design based on “Mechanistic” Lab Testing • Hveem (CT 366) • Shear Testing (T-320) • Fatigue Testing (T-321) • Hamburg WT (T-324) • Mix must meet performance requirements in Special Provisions

  14. Modified (Mechanistic) Mix Design Process Establish target binder content with Hveem (CT 366) Performance Testing • Shear testing at target binder content ± X • Select design binder content based on shear test results • At design binder content Fatigue Hamburg Wheel Track (HWT)

  15. Modified Mix Design Flow Chart HVEEMMix Design for Target “OBCH” SHEAR Testing to determine “OBCS” 3 specimens prepared and tested at HBC + 3 more each @ +/- X Total of 9 specimens per mix (3 x 3BC) If Fail Testing SELECT OBC based on SHEAR test results FATIGUE Testing @ OBCS Flexural Fatigue – 20C, 2 levels of strain (bending) – 6 Total (6 x 1BC) Flexural Stiffness - 20C & 30C – 6 Total (6 x 1BC) Spare beams recommended – 14 Total if possible HWTD testing @ SOBC– 1 Test, 50C, 4 cores

  16. Modified Mix Design Materials and Time Time Per Mix 3 wks 6 wks 1 wk HVEEM to determine target BC SHEAR Cores are prepared first Testing performed to determine “OBCS” Requires 3 x 3BC Cores (6 in. diameter x 2 in. tall) Cores are prepared with Rolling Wheel Compaction (RW) OBC based on SHEAR test results FATIGUE Beams prepared after OBCS determined 6 Flexural Fatigue (2 in. tall x 2.5 in. wide x 15 in. long) 6 Flexural Stiffness (2 in. tall x 2.5 in. wide x 15 in. long) Beams are prepared with Rolling Wheel Compaction (RW) HWTD Testing Cores are 6 in. diameter x 2.5 in. tall 1 Test with 4 cores prepared with Superpave Gyratory (SGC)

  17. Quantity of Materials Per Mix Design

  18. SPECIMEN FABRICATIONShear & Fatigue • Caltrans LLP – AC2 “Sample Preparation Design and Testing for Long Life Hot Mix Asphalt Pavements” • AASHTO PP3-94 Rolling Wheel Compaction

  19. SPECIMEN FABRICATIONShear & Fatigue • Beams and Cores cut from HMA Ingot (Example)

  20. SPECIMEN FABRICATIONShear & Fatigue • Beams and Cores cut from HMA Ingot

  21. SPECIMEN FABRICATIONShear & Fatigue

  22. SPECIMEN FABRICATIONShear & Fatigue

  23. SPECIMEN FABRICATIONShear & Fatigue

  24. FATIGUE BEAMS

  25. FATIGUE BEAMS Protection of Beams in transit/shipping is essential – no bending or flexing of packaging

  26. SPECIMEN FABRICATIONHamburg • Superpave Gyratory Compactor

  27. SPECIMEN FABRICATIONHamburg • Hamburg Testing Fixture – cut ‘flat’ on cores

  28. LABORATORY TESTING • SHEAR TESTING • FATIGUE TESTING • HAMBURG TESTING

  29. SHEAR TESTING

  30. SHEAR TESTING

  31. SHEAR CORE – Post Test Note Shear or “Slope” of specimen

  32. SHEAR TESTING 5% PSS Permanent Shear Strain (PSS) “Rutting” Spec Minimum to pass Cycles

  33. FATIGUE TESTING

  34. FATIGUE TESTING Not to scale 50% FS (typical) Flexural Stiffness (FS) Spec Minimum to pass Cycles (millions)

  35. HAMBURG WHEEL TRACKING (Moisture Sensitivity)

  36. HAMBURG WHEEL TRACKING (Moisture Sensitivity) Theoretical Rut “Rut Resistant” Cycles

  37. HAMBURG WHEEL TRACKING (Moisture Sensitivity)

  38. SPECIFICATIONS and Testing Variability

  39. SPECIFICATIONS and Testing Variability Specifications for Shear and Fatigue are statistically based The specifications are based on the lowest 5 percentile expected from testing Comparable mixes should pass this specification 95 out of 100 times Limits are set low to accommodate large testing variability present in Shear and Fatigue Testing

  40. Stabilometer Variability Based on these numbers, the 5th percentile is about 80% of the average (mean)

  41. Questions?Acknowledgements:Rita Leahy, Professor Monismith, Caltrans Staff

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