UltraThin Whitetopping Project Selection Criteria

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Ultra-Thin Whitetopping Project Selection
Criteria

• Alan Sparkman
• Executive Director
• Tennessee Ready Mixed Concrete Association

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UTW Project Selection

• Warning!!!
• This topic is extremely technical and many people
  may find some of the content offensive due to the
  level of detail
• This presentation has been rated X-E for
  excessive engineering content

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UTW Project Selection

• The audience is asked to please refrain from
  flash photography and audible outbursts during
  the presentation

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Selection Criteria 1

• Carefully choose any pavement section
• where asphalt pavement is performing poorly

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Next Step

• Send UTW your poor, your tired, your huddled
  masses of motorists yearning for freedom from
  potholes, ruts, and constant repairs

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Thank You for Your Attention!

• Questions???

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Selection Criteria The Letterbox Expanded
Edition

• Intersections
• Bus lanes
• Turning lanes
• Stopping zones
• Especially ones that are not level

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Selection Criteria - Continued

• High-volume traffic areas
• Difficult and/or inconvenient to repair
• Heavy traffic (trucks)
• Difficult areas
• Very light traffic (GA airports)
• Concentrated wheel loads
• Short turning radius

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Other Selection Criteria

• Existing asphalt pavement condition
• Thickness of asphalt
• Foundation
• Traffic loops (protected)
• Rebuild or repair?

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More Selection Criteria

• Expected future traffic
• Current repair frequency
• Safety
• Ability to stop
• Skid resistance
• Lighting

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One final Criteria

• Environmental Impact
• Fuel savings
• Air Quality less idling traffic
• Cool Communities
• Stormwater runoff/retention
• Pervious Pavement

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Thank You for Your Attention!

• Questions???
• (Remember, no flash photography)

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UTW Construction Sequence

• (Please refer to previous presentation for any
  information important enough to remember about
  the speaker)

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UTW Construction Sequence

• Get in
• Get out
• Stay out!

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Construction Considerations

• Traffic flow determines sequence and method of
  placement
• Time available to perform paving and re-open
  pavement
• Place by hand or by paving machine
• Determine mix specifications and proportions

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Construction Considerations

• Traffic flow determines sequence and method of
  placement
• Shut down or maintain traffic?
• Restricted working times?
• Other constraints

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Construction Considerations

• Time available to perform paving and re-open
  pavement
• Hi-early concrete mix design

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Construction Considerations

• Place by hand or by paving machine
• Size of job especially length of lanes
• Adequate clearance (4 5 feet)
• Rideability specifications

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Construction Considerations

• Determine mix specifications and proportions
• Early strength requirements
• Slump (depends on placement method)
• Haul time from plant to jobsite
• Time of year
• Mix characteristics

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Construction Considerations

• Mix Characteristics
• Consistent slump (but not too dry)
• Fibers (3 lbs/cubic yard)
• Set time (have to place and finish)
• Admixtures
• Dosage rates
• Dosage order and timing
• Finishability

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Construction Considerations

• Finishability
• Sticky
• High air content
• High cement content
• Admixtures
• Bleeding
• Some combos may yield excessive bleed water
• Surface tearing

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Before you block traffic

• Realistic expectations
• Clear communication
• Both sides listen as well as talk
• Pre-job meeting
• Post-completion evaluation

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Construction Sequence

• Milling
• Install loops in remaining asphalt
• Place concrete
• Try to avoid floating
• Straightedge
• Texture or tine

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Sequence Continues

• Saw
• Cure
• Paint/mark
• Re-open

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What about joints?

• Some do
• Kentucky
• Some dont
• Tennessee

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Thank You for Your Attention!

• Questions???