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307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Ride Qualit...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
The Case fo...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Why Now?
• ...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Internation...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
The Key Dif...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
About 7’ Ab...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
The “Wheel ...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Longer Wave...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
What It Boi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
How Importa...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
How Can You...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Opportuniti...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Leveling Co...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Pre-paving ...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Leveling Co...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
More than o...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
What you pa...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
What you pa...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
What you pa...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Best Practi...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Reasonable ...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Reasonable ...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Reasonable ...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Reasonable ...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Reasonable ...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
Reasonable ...
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Reasonable ...
307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE
So…
Be care...
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So…
Pay att...
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So…
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Ride Quality: Smooth Sailing or Fasten Your Seat Belts?

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Presentation delivered by Mike Robinson at the 2015 CalAPA Fall Asphalt Pavement Conference Oct. 28-29 in Sacramento.

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Ride Quality: Smooth Sailing or Fasten Your Seat Belts?

  1. 1. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Ride Quality California Asphalt Pavement Association – Sacramento – October 28-29, 2015 Smooth Sailing or Fasten Your Seat Belts? Photo courtesy of Tom Massaro
  2. 2. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE The Case for Smoothness • Lower fuel consumption • Less pollution • Less vehicle wear and tear and damage • Less damage to freight • Less pavement damage from vehicle dynamics • Happier traveling public • More money for roads!!!
  3. 3. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Why Now? • Always have had some ride quality requirements – Buyer’s impression – Straightedge – Profilograph
  4. 4. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE International Roughness Index • Improved technology makes it possible • FHWA initiative – Increase pavement life – Decrease user costs – Improve public perception
  5. 5. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE The Key Differences • Measuring actual profile rather than looking for deviations over 12’ or 25’ • Simulating profile’s effect on vehicle response – Unsprung components – Suspension / vehicle / occupant response
  6. 6. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE About 7’ About 50’
  7. 7. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE The “Wheel Hop” End We Understand • Shorter wavelength roughness is easy – Rotomill can take it out – Paver can take it out – Straightedge can find it (usually) – Profilograph can find it – Diamond grinder can find it
  8. 8. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Longer Wavelength / Dynamics • Longer than the tools we use • Can’t “see” them – Have to rely on ProVAL software • Simulated vehicle dynamics affect the result
  9. 9. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE What It Boils Down To: The time, effort, and money spent to achieve a given level of final ride quality depends on: – The pre-construction ride quality for overlays – The number and types of opportunities for improvement – The practices employed at each opportunity It is no longer just a matter of grinding bumps after paving.
  10. 10. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE How Important is This Change? • Disputes & Claims in the millions • Claim amount exceeding the original contract amount • Grinding costs equivalent to adding an additional 0.10’ overlay over the entire project
  11. 11. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE How Can You Succeed? • Be aware of every opportunity for ride quality improvement • Know best practices • Implement best practices • Monitor your work – know what you can and cannot accomplish • Be concerned and willing to learn
  12. 12. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Opportunities for Improvement • Corrections applied to existing surface • Cold milling • Cold-In-Place Recycling • Intermediate lifts • Corrections applied to intermediate lifts • Final lift • Corrections applied to final lift
  13. 13. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Leveling Course
  14. 14. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Pre-paving Grind
  15. 15. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Leveling Course Followed by Grinding
  16. 16. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE More than one removal option
  17. 17. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE What you pave on matters
  18. 18. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE What you pave on matters
  19. 19. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE What you pave on matters
  20. 20. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices - General • CONSISTENCY IS KEY • Maintain constant speed – DO NOT STOP – Milling – CIR – Paving
  21. 21. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices - General • Balance operation – Mix production – Haul • To the paver, from the coldmill – Paver / Coldmill speed – Compaction of mix • Hot • Warm • Cold
  22. 22. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices - General • Use as long an averaging reference as possible – Sensors at each end of the cold mill – Ski – Mat referencer – Long-wheelbase grinder • Control cross-slope as well as profile
  23. 23. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices - General • Reference as smooth a surface as possible – Existing surface – Previously-ground or placed lane
  24. 24. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Milling • Consistent maintenance – Blocks and teeth – Referencing equipment – Machine in general • May want fine or micro-milling, especially for single, thin overlays
  25. 25. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Leveling Course • Choose an appropriate mix • Make sure you have adequate time to compact – Thin lifts cool very quickly – Multicool recommended • Use pneumatic rollers – Steel drums will bridge
  26. 26. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – CIR • Verify existing conditions for consistency • Have a choice to make: – Constant depth • More consistent material • Little to no ride quality improvement – Variable depth – profile correction • Less consistent material • Can improve ride quality significantly Photo courtesy of Darren Coughlin
  27. 27. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – CIR • You can grind bumps on CIR – Make sure recompaction is good before grinding – May need to grind in cooler conditions (i.e. nights or mornings) – Focus on high spots, not dips – Choose tool and timing carefully • Some have reported raveling of ground surface when exposed to traffic for extended periods • Remember – CIR is not HMA Photo courtesy of Darren Coughlin
  28. 28. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving • Choose an appropriate mix • Control mix properties – Gradation – Binder content – Temperature – Segregation
  29. 29. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving • Balance production / haul / placement / compaction • Monitor time available to compact – Multicool – May need to adjust for changing conditions
  30. 30. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving • Minimize contact with the paver – Windrow paving – Material transfer device / vehicle
  31. 31. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving • Avoid thermal and mechanical segregation in the hopper – Either fold the wings after every load, or never fold them – Do not run the hopper below half full
  32. 32. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving • If end dumping – Do not back into the paver – let the paver pick up the truck – “Break” the load before releasing the end gate – Flood the hopper
  33. 33. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving Do not allow material to overflow
  34. 34. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving • Set flow gates to allow for balanced flow and steady flight chain operation – If paver is not centered on pass, adjust accordingly
  35. 35. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving • Use auger and tunnel extensions as necessary • Use material management / anti-segregation baffles / chain curtains / etc.
  36. 36. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving Maintain a constant (and proper) head of material ahead of the screed
  37. 37. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving • Create as straight a joint as possible – Stringline and guide – If you cut the longitudinal joint back, cut it in a straight line • Pave in constant widths as much as possible • If you have to adjust widths, do it slowly and adjust material flow
  38. 38. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving • Minimize raking • Do not walk on the mat
  39. 39. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving • Do not park the rollers on the mat • Reverse roller direction at an angle • Control roller speed, particularly on turns
  40. 40. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Best Practices – Paving • Use a straightedge on construction joints • Leave enough manpower and material to build the joint
  41. 41. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Reasonable Expectations • Ride quality after any given opportunity for improvement – Depends on the existing ride quality – Will generally be no better than about 60% of pre-operation ride quality • You results may vary – you need to know what you can accomplish.
  42. 42. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Reasonable Expectations • Leveling course – Generally less improvement than overlay – Can be improved with stringline / cuts & fills • Remember differential compaction – You can grind or mill leveling courses
  43. 43. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Reasonable Expectations • Cold-In-Place recycling – MRI of 80 to 90 inches per mile is possible • Assuming good paving practices • Assuming good recompaction Photo courtesy of Darren Coughlin
  44. 44. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Reasonable Expectations • Cold milling – About 60% of pre-milling ride quality is possible – Requires grade control and good reference – Requires grinding for ride, not production – May require fine or micro texture
  45. 45. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Reasonable Expectations • Bump grinding – Difficult to fix low spots – Deep grinds are slow, create more disposal, and may run afoul of specifications – Longer wheelbase can help
  46. 46. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Reasonable Expectations • Paving – About 60% of pre-paving ride quality is possible – Can be considerably less if pre-paving ride quality is high – Depends on paving practices used Reasonable Improvement from FHWA FP-03: – Single lift – 12-25 inches/mile improvement – Multiple lifts – 34-43 in/mi improvement New construction should yield 60-65 in/mi final MRI
  47. 47. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE Reasonable Expectations • ProVAL Smoothness Assurance Module – 2D simulation of a 3D situation – Assumes precise depth control of grinder – Grinder must be accurately input • Results for an 18’ wheelbase will not match the simulation for a 25’ wheelbase grinder – Does not account for grinder wear, ability to transition, tendency to ride out of cut, etc. – Accurate locations of grinds are essential – use GPS, not just the DMI – Dependant on who runs the grinding simulation
  48. 48. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE So… Be careful
  49. 49. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE So… Pay attention to details
  50. 50. 307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE307-213-0223 mike@mikerobinsonllc.com Mike Robinson, PE So… • Look at what you are paving on • Look at every opportunity to improve ride quality • Use best practices • Know what you can and cannot accomplish

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