White topping highways for life

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White topping/highways for life
Leon Eckroth , Design
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White Topping /Highways for life

• Project Team
• Design
• Planning
• Devils Lake District
• Construction
• FHWA
• ND Ready Mix Concrete Products Association
• And many others

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White topping / highways for life

• Westbound portion of Hwy 2 from Rugby to Berwick.
• 8.25 miles in length.
• Project started out as a mine blend with
  widening.
• During the design phase upper management looked
  at a number of projects and this one was tagged
  for White Topping.
• Planning Division then applied for HFL funds.
• ND did receive 1 million to help fund this
  project.
• The winning bid for this project was 6.793
  million.

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highways for life Commitments

• Mill existing surface.
• Use the milled asphalt to widen and overlay the
  shoulders.
• Overlay the milled surface with concrete.
• Incorporate White Topping Specifications.
• Implement a full lane closure and route EB and WB
  traffic head to head.
• Use leave outs for cross traffic at all
  intersections throughout the project limits.

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Highways for life commitments

• Widen the median and outside shoulders.
• Upgrade safety features to meet current standards
  (lane widths and shoulder widths, turn lanes).
• Milling, paving, and installation of turn lanes
  should last approximately 9 weeks.
• Reduce speed to 60 mph in construction zone.
• Hold a public information meeting before
  construction begins.
• Develop news releases for newspapers and radio
  and TV during and after construction.
• Distribute surveys to nearby residents and
  businesses during and after construction.

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Highways for life commitments

• Have a goal of 4 on the Likert scale for the
  following 2 questions on the surveys.
• How satisfied are you with the approach used to
  construct the new facility in terms of minimizing
  disruption.
• How satisfied are you with the new facility
  compared to its previous condition.
• Have a goal of zero worker injury rates for this
  project and require the contractor to submit a
  plan identifying how this will be accomplished.
• Use an IRI specification for the PCC pavement.
• Create a traffic control plan with the use of
  precast concrete median barriers in the crossover
  areas. With flashing beacons raised pavement
  markers. Similar to the DOT standards D-704-43
  and 44.
• All HFL Commitments were met

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Designing the white topping

• Needed a concrete depth for a 20 year design life
  .
• 7 was determined to be used, remaining
  decisions were based on that 7.
• Bonded White Topping
• Traffic control was one of the first issues that
  had to be addressed.
• Cross traffic at intersections needed to be
  addressed.
• Design showed 7 Leave outs in the whole project.
  
• The contractor and the DL District reduced this
  number to 1 during the paving operation.
• What type of surfacing should be used in the
  areas of culvert replacement.
• First idea was full depth concrete of 9 with
  dowel bars and 15 spacing on the saw cuts.
• Final design called for 12 of aggregate base and
  3 of HBP then the 7 of White Topping (uniform
  section).

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Designing the white topping
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Designing the white topping

• First job of this type in the state.
• Met with representatives of the concrete pavement
  industry.
• Calls to the ND Ready Mix Concrete Products
  Association.
• Calls to Wisconsin, Minnesota, Michigan and
  Colorado.
• Materials made more calls during the process.

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Special provisions

• 6 special provisions used for this project.
• First three covered the basic PCC conditions.
• 1. Testing the strength of PCC using the
  maturity method .
• 2. PCC pavement well-graded aggregate.
• 3. Surface tolerance/grinding.
• Next three covered payment methods, joint
  cutting, lay down, etc.
• 4. PCC pavement longitudinal tining.
• 5. PCC pavement - uncontrolled cracking.
• 6. White Topping covered method of payment,
  milling, surface prep, placing and finishing.

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Method of payment

• 2 special pay items for the white topping
• Concrete Pavement White Topping by the CY
• Concrete Placement White Topping by the Square
  Yard

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White topping quantities

• Square yards of pavement (Included the placement,
  joint sawing)
• Concrete by the CY (Measured amount)
• Plans called for 7 of concrete.
• Additional 10 for irregularities in the profile
  and repairing the cross slope.

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joints

• Joints were required every 7 for transverse and
  longitudinal.
• The joint width was 1/8 and not sealed.
• 36,200 LF of joints per mile .
• Contractor used 4 to 5 saws to keep up with the
  lay down operation.
• Eliminate any uncontrolled cracking. 
• Total width of the concrete slab was 27 wide.
• Outside part of the slab was 14 with a joint cut
  at 7 from center.
• Inside part of the slab was 13 with a joint cut
  at 6.5 from center.

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Joint detail
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Construction issues

• Grade line control.
• Advised not to set a grade line in the plans. Do
  it in the field.
• Used a string line on this project.
• Field personnel would really like some guidance.
• Better guidance on the grade line should be
  included in future plans.
• May be more beneficial to cut the inside slab
  joint at 6 from center as it would put the joint
  more in the middle of the driving lane.

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Project numbers

• Contractor for this project was PCI (Progressive
  Contractors Inc.)
• Total cost 6.94 million to date.
• 1 million coming from HFL.
• Slightly higher than mine and blend even with the
  current oil costs.
• White topping portion of this project was
  completed in 8 days.
• 1.5 days delay due to rain.
• Total construction time was set at 90 days.
• Plan quantity was 28,311 CY.
• Actual field quantity was 28,248 CY.
• Plan quantity for placement was 130,500 SY.
• Total length of joints were 298,200 ft. 56.47
  miles

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• Any questions
• Leon Eckroth, Design
• Clayton Schumaker, Materials
• Greg Semenko, Devils Lake District
• Darrin Lindblom, Devils Lake District
• Jack Smith, Technical Services
• Dave Sethre, ND Ready Mix Concrete Products
  Association