HMA joint construction

1,056 views
593 views

Published on

Presentation on best practices for asphalt pavement joint construction delivered at the CalAPA San Diego Technical Committee meeting April 23, 2014.

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,056
On SlideShare
0
From Embeds
0
Number of Embeds
6
Actions
Shares
0
Downloads
232
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

HMA joint construction

  1. 1. Wednesday, April 23, 2014 San Diego, CA
  2. 2. •  Transverse  Joint  Construction   Methods   •  Longitudinal  Joint  Construction   Methods   •  Proper  Joint  Luting     JOINT  CONSTRUCTION  
  3. 3. •  Good  joints   are  no   mystery   •  Training  &   practice   JOINT  CONSTRUCTION  
  4. 4. JOINT  CONSTRUCTION  
  5. 5. JOINT  CONSTRUCTION  
  6. 6. Butt  Joint   JOINT  CONSTRUCTION  
  7. 7. JOINT  CONSTRUCTION   Rolled  Mat   Rolled  Mat   New  Mat   Paper   Papered  Transverse  Joint   Remove     paper     &  ramp  
  8. 8. JOINT  CONSTRUCTION  
  9. 9. JOINT  CONSTRUCTION  
  10. 10. JOINT  CONSTRUCTION  
  11. 11. JOINT  CONSTRUCTION  
  12. 12. JOINT  CONSTRUCTION  
  13. 13. JOINT  CONSTRUCTION  
  14. 14. JOINT  CONSTRUCTION   Remove Tapered area
  15. 15. •  Center  tow  point     •  Set  width   •  Set  crown     •  Set  extender   slope     &  height   •  Use  boards  that   allow  for   compaction  rate   JOINT  CONSTRUCTION  
  16. 16. JOINT  CONSTRUCTION   A  good  rule  of  thumb  is  to  raise  the  screed  20   percent  more  than  the  compacted  thickness.  
  17. 17. JOINT  CONSTRUCTION  
  18. 18. •  First  step  is  screed  pre-­‐heating   JOINT  CONSTRUCTION   Fuel  Pump     Spraydown  /   Burner   Glow  Plug  /   Fan  Switches  
  19. 19. JOINT  CONSTRUCTION   •  Null  screed  
  20. 20. JOINT  CONSTRUCTION   •  Introduce   angle     of  attack   •  Crank  until   resistance  is   felt  
  21. 21. JOINT  CONSTRUCTION   •  Fill  auger   chamber  half  full   •  Conveyor   manually   •  Auger  manually   •  Shovel    if  needed  
  22. 22. JOINT  CONSTRUCTION  
  23. 23. JOINT  CONSTRUCTION  
  24. 24. JOINT  CONSTRUCTION  
  25. 25. JOINT  CONSTRUCTION  
  26. 26. JOINT  CONSTRUCTION  
  27. 27. JOINT  CONSTRUCTION  
  28. 28. •  Check  smoothness   before  the  mat   cools  to  ensure  a   good,  smooth  joint   JOINT  CONSTRUCTION  
  29. 29. JOINT  CONSTRUCTION   What Happened Here?
  30. 30. Longitudinal   Joints   JOINT  CONSTRUCTION  
  31. 31. JOINT  CONSTRUCTION   Staggered  Paving  Joints  
  32. 32. JOINT  CONSTRUCTION  
  33. 33. JOINT  CONSTRUCTION  
  34. 34. Notch  Wedge  (Caltrans  Spec’s)   JOINT  CONSTRUCTION  
  35. 35. Notch  Wedge  Joint  Maker   JOINT  CONSTRUCTION  
  36. 36. JOINT  CONSTRUCTION  
  37. 37. JOINT  CONSTRUCTION  
  38. 38. JOINT  CONSTRUCTION  
  39. 39. JOINT  CONSTRUCTION  
  40. 40. JOINT  CONSTRUCTION  
  41. 41. JOINT  CONSTRUCTION  
  42. 42. JOINT  CONSTRUCTION   Compacted Mat Uncompact ed Mat Typical Overlap on Longitudinal Joints Thickness of Rolldown 1 – 1½ inches
  43. 43. JOINT  CONSTRUCTION   Compacted   Mat   Uncompacted   Mat   Mix  “Bumped  Back”  to  Joint  
  44. 44. JOINT  CONSTRUCTION  
  45. 45. •  Why  is  this   wrong?   JOINT  CONSTRUCTION  
  46. 46. JOINT  CONSTRUCTION  
  47. 47. JOINT  CONSTRUCTION  
  48. 48. Quality   Joints  are   No   Accident!   JOINT  CONSTRUCTION  
  49. 49. Questions??   JOINT  CONSTRUCTION  

×