Delphi Municipal Airport ** Open House July 23, 2008 - - PowerPoint PPT Presentation

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Delphi Municipal Airport ** Open House July 23, 2008 - - PowerPoint PPT Presentation

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Delphi Municipal Airport ** Open House July 23, 2008 Rehabilitation Timing Restoration Resurfacing Structural/Functional Condition Reconstruction Min. Acceptable Rating Age or Traffic Optimize Cost Performance Consider Concrete

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Delphi Municipal Airport ** Open House

July 23, 2008

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  • Min. Acceptable Rating

Resurfacing Reconstruction Restoration

Rehabilitation Timing

Structural/Functional Condition Age or Traffic

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Optimize

Cost Performance

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Consider

Concrete Overlays

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Indiana Overlays

  • I – 69 North of SR 18 – 11”

1986

  • I – 65 North of SR 114 – 10.5”

1994

  • 1 – 94 West of SR 39 – 13”

1998

  • I – 70 at US 27 – Richmond – 12”

2000

  • Harding Street – Indianapolis – 6”

1985

  • 121st Street – Fishers – 9”

1992

  • Allisonville Rd – N. of 96th – 7”

1999

  • Rudisill Blvd. Inter. – Fort Wayne – 6”

2006

  • Bremen Highway – St. Joseph Co. – 4”

2007

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Madison, IN Airport Apron

3 ½ “ Concrete overlay over existing HMA Joints sawed at 4’ x 4’ spacing

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Madison, IN Airport Apron

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Unbonded Overlay Concrete over Concrete

. . .. . .. . . . . . . . . . .

  • Consists of thick concrete layer (125 mm or

greater) on top of an existing concrete.

  • Uses a “separation interlayer” to separate new
  • verlay and existing concrete.
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Unbonded Overlays

Separation Interlayer:

Overlay Old Pavement “Key” Overlay Old Pavement Smooth Slip Plane Thick Interlayer (> 50 mm)

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UNBONDED CONCRETE

Advantages

OVERLAYS

  • Can Place on Pavement in Bad Condition.
  • Less Pre-Overlay Repair Needed

Than Other Overlay Designs.

  • No Future Reflective Cracking.
  • Avoid Reconstruction Problems.
  • Can Construction Rapidly
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Unbonded Overlays

  • Very Good
  • Can be expected to perform for 20+ years.

– Most failures are due to the use of inadequate separation layers.

Performance

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Concrete Overlay of Asphalt Whitetopping

  • Consists of thick concrete layer (100 mm or greater)
  • n top of an existing asphalt pavement.
  • Behaves as a new pavement on a strong base.
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Whitetopping History

  • Modern usage began in Iowa in 1960’s

where heavy loads from farm trucks created a need for a durable pavement.

  • Performance was excellent
  • Over 1000 miles of whitetopped roads

since the 1960’s

  • Now used for Interstates, highways,

airports, intersections and parking lots

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Typical Whitetopping Thickness

  • Depends on expected traffic load.

– City streets, county roads, and small airports

  • 100 to 175 mm (4 to 7 in.)

– Primary roads and interstate highways

  • 175 to 280 mm (7 to 11 in.)

– Large airports

  • 200 to 460 mm (8 to 18 in.)
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Whitetopping - Advantages

Construction

  • Can place on pavement in

bad condition.

– Little or no pre-overlay repair needed.

  • Avoid reconstruction

problems.

– Minimal rain delays. – Maintain traffic on existing surface.

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Whitetopping - Advantages

  • Improved structural

capacity.

  • Maintains high level of

serviceability.

  • Low maintenance.
  • No seasonal weakening

(spring breakup).

  • Concrete slabs bridge

problems asphalt cannot.

  • Light reflective, safe

riding surface.

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Whitetopping Construction

  • Critical issue is uniform support
  • Subgrade / base failures need repair
  • Need to evaluate drainage ( esp. Inlays)
  • Address surface distortions

– Direct application – Profile milling – Leveling course

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Good reference for Concrete Overlays

www.pavement.com www.cptechcenter.org

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CONCRETE OVERLAYS

Payment

NOTE: Divided payment is the most equitable and economic.

Cubic Yard Square Yard

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REHABILITATION OF RUNWAY “18 – 36”

Delphi Municipal Airport

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Design – Concrete Overlay

  • 5” Plain Concrete Pavement placed over

existing asphalt runway

  • Transverse joints spaced @ 12’-0”
  • Longitudinal joints spaced @ 10’-0”
  • All joints – sawed, beveled and sealed
  • Outside longitudinal joint and the 3

transverse joints at north and south ends of runway – tied with ½” deformed bars spaced 3’- 0 c-c As constructed – concrete overlay averaged 5.75”

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Project Bid Tabs – Base: FDR w/ HMA Overaly

$912,999.85

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Project Bid Tabs – Alternate: Concrete Overlay

$715,935.58

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Surface Preparation

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Securing Tie Bars @ Longitudinal Joint

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Placement

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Finishing

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Curing

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Sawing

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Notice crack & broom finish

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Protection of Flexural Beam samples

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Questions?

Indiana Chapter - American Concrete Pavement Association One North Capitol Avenue, Suite 480 Indianapolis, IN 46204 Office: (317) 634-8989 Fax: (317) 634-8988 mbyers@pavement.com plong@pavement.com www.indianaconcretepavement.com

INDIANA CHAPTER