NovaChip - PowerPoint PPT Presentation

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NovaChip

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  1. NovaChip

  2. What is NovaChip • Ultra-thin polymer modified asphalt surface treatment. • Combines open graded hot mix asphalt with emulsified asphalt polymer-modified membrane.

  3. Features & Benefits • Superior bond to the existing surface • Increases skid resistance, reduces noise • Ultra-thin application eliminates the need for utility adjustments. • Minimal traffic disruption, requires a single lane closure • Expected life cycle of up to ten years with crack sealing.

  4. Features & Benefits (cont..) • Does not affect overhead clearances on bridges, overpasses, signs, and other structures. • Reduces hydroplaning and reduces spray on wet roadways.

  5. Equipment • Specialized NovaChip paver • Rollers • Water truck

  6. Materials • Open graded hot mix asphalt • NovaBond, a polymer modified asphalt emulsion.

  7. History of NovaChip • 1988 - First trial in France • 1992 - Introduced in the United States • 1992-93 - Projects in TX, AL, PA, and NJ.

  8. Application Rates • Novabond(TM) emulsion membrane 0.13 - 0.25 gal/sy • Ultra-thin hot mix asphalt overlay • Minimum application rates: Type A - 45-55 lbs./sy Type B - 50-65 lbs./sy Type C - 55-70 lbs./sy • Total Thickness: 3/8 to 3/4” • Maximum recommended thickness: 1-1/4”

  9. Road Preparation for NovaChip • Pavement should be in reasonably good condition. • Pavement should be swept clean • Pavement should be dry before lay-down. • Crack seal all cracks ¼” wide or more • Repair all failed areas with full depth Patching. • Cover all utilities

  10. Applications for NovaChip • Asphalt pavements • Concrete pavements • Airports • Interstate highways • Turnpikes

  11. Total 9/16” Depth of Mix 3/8” Nominal Mix Size 3/16” NOVABOND depth NovaChip®: The Process PHASE 1 : during application (3/8” nominal size) The Novabond Emulsion “Wicks Up” Around the HMA Aggregates Surface of Mix 7.5-10 mm coating on mix Existing Pavement

  12. Skid resistance test - PA SR 422 Chester & Montgomery Counties NovaChip applied to existing PCC surface Aug. 93 before - Dec. 93 after

  13. NovaChip Paver

  14. Receiving hopper. 4 screw augers help stop segregation

  15. NovaBond is sprayed onto road surface inches in front of the hot mix

  16. Muhlenberg Township, PA

  17. Full depth patching & crack sealing before NovaChip

  18. Paving Of NovaChip

  19. Rolling in static mode to seat aggregate material

  20. Care is taken when rolling along curb lines

  21. NovaChip’s open gradation allows water to penetrate and disperse faster

  22. East Hanover Township, Lebanon County, Pennsylvania Old Rt 22 before NovaChip

  23. Only very bad sections had full depth removal & repair

  24. Tack coat applied before leveling course of HMA

  25. Loaded trucks wait their turn to go into the paver

  26. Hot mix asphalt leveling course placed on Rt 22

  27. Leveling course before compaction

  28. Steel drum roller compacting hot mix asphalt leveling

  29. Liquid NovaBond placed directly in front of NovaChip hot mix screed

  30. NovaChip Lay-down on Rt.22

  31. Open graded NovaChip placed on hot mix asphalt

  32. NovaChip open graded mix

  33. NovaChip laid down ¾ inch compacted

  34. Roller only ‘seats’ the aggregate in the NovaChip

  35. Hand work is sometimes necessary with NovaChip

  36. Center joint hardly noticeable

  37. Alatchua County, FL Project Constructed 1999

  38. Back of tamping screed

  39. NovaChip

  40. 5 Minutes after lay down loaded trucks cross pavement

  41. No material deterioration or displacement

  42. Traffic can be returned to the pavement quicker

  43. Orange County, Florida Rt 440

  44. Concrete two lane highway, pavement joints 2 inches wide.

  45. Expansion joints routed & filled with flexible hot mix asphalt.

  46. South lane NovaChip complete

  47. Traffic flow was uninterrupted

  48. Joint maker on NovaChip paver

  49. NovaChip pavement mat

  50. Evaporating steam from the NovaBond