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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 detailThis presentation has been rated X-E for excessive engineering content. UTW Project Selection. The audience is asked to please refrain from flash ph
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1. Ultra-Thin Whitetopping Project Selection Criteria Alan Sparkman
Executive Director
Tennessee Ready Mixed Concrete Association
2. 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
3. UTW Project Selection
The audience is asked to please refrain from flash photography and audible outbursts during the presentation
4. Selection Criteria #1 Carefully choose any pavement section
where asphalt pavement is performing poorly
5. Next Step
Send UTW your poor, your tired, your huddled masses of motorists yearning for freedom from potholes, ruts, and constant repairs
6. Thank You for Your Attention! Questions???
7. Selection Criteria � The Letterbox Expanded Edition Intersections
Bus lanes
Turning lanes
Stopping zones
Especially ones that are not level
8. 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
9. Other Selection Criteria Existing asphalt pavement condition
Thickness of asphalt
Foundation
Traffic loops (protected)
Rebuild or repair?
10. More Selection Criteria Expected future traffic
Current repair frequency
Safety
Ability to stop
Skid resistance
Lighting
11. One final Criteria Environmental Impact
Fuel savings
Air Quality � less idling traffic
Cool Communities
Stormwater runoff/retention
Pervious Pavement
12. Thank You for Your Attention! Questions???
(Remember, no flash photography)
13. UTW Construction Sequence (Please refer to previous presentation for any information important enough to remember about the speaker)
14. UTW Construction Sequence Get in
Get out
Stay out!
15. 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
16. Construction Considerations Traffic flow determines sequence and method of placement
Shut down or maintain traffic?
Restricted working times?
Other constraints
17. Construction Considerations Time available to perform paving and re-open pavement
Hi-early concrete mix design
18. Construction Considerations Place by hand or by paving machine
Size of job especially length of lanes
Adequate clearance (4 � 5 feet)
Rideability specifications
19. 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
20. 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
21. Construction Considerations Finishability
Sticky
High air content
High cement content
Admixtures
Bleeding
Some combo�s may yield excessive bleed water
Surface tearing
22. Before you block traffic � Realistic expectations
Clear communication
Both sides listen as well as talk
Pre-job meeting
Post-completion evaluation
23. Construction Sequence Milling
Install loops in remaining asphalt
Place concrete
Try to avoid floating
Straightedge
Texture or tine
24. Sequence Continues Saw
Cure
Paint/mark
Re-open
25. What about joints? Some do �
Kentucky
Some don�t �
Tennessee
26. Thank You for Your Attention! Questions???