Airport Pavement Management Tom Freeman, Program Manager ... · Airport Pavement Management Tom...
Transcript of Airport Pavement Management Tom Freeman, Program Manager ... · Airport Pavement Management Tom...
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Airport Pavement Management
Tom Freeman, Program Manager,
Pavement Management Texas A&M Transportation Institute
Phone: 979-845-9923
E-Mail [email protected]
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AGE
$ 0.70
$ 3.50
$ 6.15
$14.0
40 % Time
70 % Time
90 % Time
PMS Concepts
Fog $0.40 Micro $2.00 Mill and Ove $6.00 Recon AC $24.50 PCC $55.00
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Example of a RunwaySection Designation.
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Inspection Procedures • Inspect Primary Pavements
– FAA Condition Survey – 20% Inspection Rate
• 2 Runways • Taxiways • Aprons
• Document Conditions and Distresses With Digital Photos
• “Plain English” Report of Conditions
• Videotape Runway Ends, Pavement, and Tours
Put all data on CD
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Step 1. Inspect sample units to determine type, quantity and severity level of pavement distresses.
Low SeverityLongitudinal Cracks
Medium SeverityAlligator Cracks
Step 4. Adjust Total Deduct Value.
Step 5. Compute Pavement Condition Index, PCI=100-CDV, for each sample unit inspected.
Step 6. Determine Pavement Condition Rating
Total Deduct Value0 100 200
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What Did We Find?
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Center AC Pavements
15.0 20.0 25.0 30.0
Age
Basic
General
Transport
Other
ACCEN
2.75 Points/Yr
Family Curve for Center AC Pavements
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ements
20.0 25.0 30.0
Basic
General
Transport
AACCEN
3.23 Points/Yr
Family Curve for Center AAC Pavements
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Three Major Distresses
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Three Major Distresses • Edge Cracking and Encroachment
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Three Major Distresses • Edge Cracking and Encroachment • Weathering and Raveling
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Three Major Distresses • Edge Cracking and Encroachment • Weathering and Raveling • Block Cracking
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Edge Happens !!
• Moisture Changes Along Edge of Pavement – Less Water Under Pavement – More Water Along Edge
• Soil Shrinks and Swells
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Edge Happens !!
• Moisture Changes Along Edge of Pavement – Less Water Under Pavement – More Water Along Edge
• Soil Shrinks and Swells • Differential Temperature • Fix By Crack Sealing (Kill Weeds) • May Be Able To Address In Design - Wider
Bases
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Encroachment • Weeds and Grasses Along Edge of
Pavement • Causes Cracking Along Edge, FOD,
Weathering of Pavement • Reduces Width of Pavement
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Encroachment • Weeds and Grasses Along Edge of
Pavement • Causes Cracking Along Edge, FOD,
Weathering of Pavement • Reduces Width of Pavement
• Fix With Mowing, Herbicide, Grading,
Millings, Wider Bases
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Low Severity Block Cracking - Low Weathering
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Medium Block Cracking, Medium Raveling
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What Causes This?
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What Causes This?
• Lack of Traffic • Sun/Ultraviolet and Oxygen Remove
Volatiles (Maltenes) • Pavement Gets Brittle • Daily and Annual Temperature Cycling
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What Causes This?
• Lack of Traffic • Sun/Ultraviolet and Oxygen Remove
Volatiles (Maltenes) • Pavement Gets Brittle • Daily and Annual Temperature Cycling
• Asphalt Worn Away, Aggregate Gets Loose • Hello FOD, Goodbye Paint
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Fixes
• Fix Block By Mill and Overlay, Cape Seal, or Reconstruct
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Fixes
• Fix Block By Mill and Overlay or Reconstruct – Expensive – Deteriorates Slowly, So We Can Wait. – Fog to Reduce Rate – May be able to use Cape Seal
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Fixes
• Fix Block By Mill and Overlay, Cape Seal, or Reconstruct – Expensive – Deteriorates Slowly, So We Can Wait. Fog to
Reduce Rate • Fix Weathering and Raveling by Fog, Coal
Tar, Rejuvenator, or Slurry all BEFORE Cracking
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When Is The Proper Time To
Do Work?
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Too Late?
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Way Too Late!!
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Wait Until Cracked and Slurry Seal
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If Cracks Are Small, Will Perform Better, But To PREVENT Reflection Cracking, Must Treat BEFORE It Cracks
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Cracks Come Right Back Through
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Some Longitudinal and Transverse Cracking
Fix by Sealing Cracks
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Lots of Sealed Longitudinal Cracks
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Routine Preventive Maintenance is the Key
• Preserve, Protect, or Renew Surface to Prevent Cracking
• For Airports, Block Cracking is Death. Must Treat BEFORE All Cracked Up!!
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So, Protect Pavement From Cracking and Weathering By:
• Fog Seal (Use on HMAC, Slurry, Seal Coat) – Dilute AC Emulsion
• Coal Tar Seals – Non-Asphalt Based – Some Include Sand
• Rejuvenators (HMAC Only) – Specially Formulated To Replace Volatiles
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Protection (Continued)
• Microsurfacing or Slurry Seal (Use on HMAC, Slurry, Seal Coat) – Asphalt And Aggregate
• Crack Seal
Do Same Things You Have Been Doing, Just Do Them Earlier
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Fog Seal, Coal Tar, or Rejuvinator
Pre-P401?
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Slurry Seal
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Plan of Attack
• Seal Cracks (Every Two Years@ $0.10/Ft) • Blade Edges and Kill Weeds (Annual) • Fog Seal (Every 2-4 Years @ $0.20 - $0.50/SY) • Rejuvenator (See Manufacturer) • Micro or Slurry Seal (5-7 Years @ $2/SY)
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Why Preventive Maintenance?
Why Not Just Let It Rot?
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0
10
20
30
40
50
60
70
80
90
100
1/31/93 6/15/94 10/28/95 3/11/97 7/24/98 12/6/99Date
PCI Good
Fair
Poor
PCI Performance Curves for Microsurfacing
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0
10
20
30
40
50
60
70
80
90
100
0 10 20 30 40 50Age
PC
I
PreventiveMaintenance
$1.50/SY $1.20/SY $1.50/SY
Total = $4.20
Runway Closed 1 - 3 Days Each Time
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0
10
20
30
40
50
60
70
80
90
100
0 10 20 30 40 50Age
PCI
Overlay
$6/SY $6/SY $6/SY
Total = $18
Runway Closed 4 - 10 Days Each Time
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0
10
20
30
40
50
60
70
80
90
100
0 10 20 30 40 50Age
PC
I
Reconstruct
$12/SY $12/SY
Total = $24
Runway Closed 4- 6 Months Each Time
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What Should You be Doing?
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What Should You be Doing?
• https://ftp.dot.state.tx.us/pub/txdot-info/avn/pmp-2000.pdf
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FAA Requirements • Since January 1, 1995 airport sponsors that
accept AIP funds for pavement replacement or reconstruction are required to commit to a grant assurance which stipulates that an effective pavement maintenance/ management program will remain in effect throughout the useful life of the constructed pavement. Such a program will have four basic components:
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Required Components
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Required Components • a pavement inventory which shows the dimensions,
locations, and maintenance history of all paved surfaces – Show the location, dimensions, and pavement type of all
runways, taxiways, and aprons. – The year of construction and most recent major rehabilitation
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Required Components • a pavement inventory which shows the dimensions,
locations, and maintenance history of all paved surfaces – Show the location, dimensions, and pavement type of all
runways, taxiways, and aprons. – The year of construction and most recent major rehabilitation
• a prescribed inspection schedule, which will minimally involve detailed annual assessments, and monthly drive-by observations – Detailed inspections must be conducted at least once annually. – Drive-by inspections must be conducted at least once monthly
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Required Components • record keeping which documents inspection dates,
findings, locations of distress, and remedial actions scheduled and performed. The minimum information to be recorded is listed below, – Inspection Date – Location – Distress Type – Maintenance Scheduled of Performed.
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Required Components • a method of data retrieval which would permit a
comprehensive presentation to the FAA if they request one.
Remember, if inspections and remedial actions are not documented, then they did not occur. Documentation is vital.
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How to Perform Inspections
• Minimum of once per month – Walk or slowly drive the airport pavements, looking for
any irregularities, damage, or deficiencies. – Make written notes describing the date, the pavement
section, the location, the type, and the extent of the problems. Forms are in report.
– Note the corrective action taken, or to be taken, including the date of action.
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Questions?
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Airport Pavement Management
Tom Freeman, Program Manager,
Pavement Management Texas A&M Transportation Institute
Phone: 979-845-9923
E-Mail [email protected]