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How do we decidewhich roads to fix when there is not
enough money to fix everything?
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Outline
• Pavement condition assessment.
• Key concepts for pavement preservation.
• Selecting projects under a preservation strategy.
• Three Steps to Implement a preservation strategy for local roads.
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Surface Rating Survey
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Pavement Surface Rating
10 – 9: Excellent7 – 8: Good
6: Fair<5: Poor
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Pavement Surface Rating
10 – 9: Do Nothing8: Crack Seal7: PM Paving6: Rehab5: Major Rehab
<5: Replace
PavementSurface Rating
Ride Quality (IRI)
PavementCondition Index
(PCI)
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9/10 – Excellent
8 - Good
7 - Good
6 - Fair
5 - Poor
4 - Poor
3 - Very Poor
172 - Very Poor
1 - Very Poor
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E-Score Hardware
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Pavement Management
Pavement Preservation Strategy
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What are we trying to do with Preventive Maintenance?
• Seal cracks to keep water out
• Rejuvenate a weathered surface
• Prolong life of the pavement
• Non-structural
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Time
Con
dit io
n R
atin
g
Pavement Performance Curveand Windows of OpportunityDo Nothing
Non-Paving PM
PM Paving
Multi-Course
Major Rehab/Recon
$1
$4
$16
PM Overlay by Initial Surface Score
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6
7
8
9
10
Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9Y10 Y11
Project Age
Surfa
ce S
core Score 6
Score 7
Pavement Management
Why does pavement preservation work?
20105 15 25 30
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7
8
9
10
5
Years
Typical Pavement Deterioration Curvefrom Surface Score History
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Flex/Overlay
20105 15 25 30
6
7
8
9
10
5
Years0
20105 15 25 30
6
7
8
9
10
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Years0
20105 15 25 30
6
7
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9
10
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Years0
20105 15 25 30
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7
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10
5
Years0
$125k $125k $500k
20105 15 25 30
6
7
8
9
10
5
Years0
$750k $1.5M
Poor Fair Good Excel
Lane
Mile
s
Poor Fair Good Excel
Lane
Mile
sWorst First
Poor Fair Good Excel
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sWorst First
Poor Fair Good Excel
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sWorst First
Poor Fair Good Excel
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sWorst First
Poor Fair Good Excel
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Mile
sWorst First
Poor Fair Good Excel
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Mile
s Worst First
Poor Fair Good Excel
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s Worst First
Poor Fair Good Excel
Lane
Mile
s Worst First
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s Worst First
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s
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s
Pavement Preservation
Poor Fair Good Excel
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Mile
s
Pavement Preservation
Poor Fair Good Excel
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Mile
s
Pavement Preservation
Poor Fair Good Excel
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Mile
s
Pavement Preservation
Poor Fair Good Excel
Lane
Mile
s
Pavement Preservation
Poor Fair Good Excel
Lane
Mile
s
Pavement Preservation
Poor Fair Good Excel
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s
Pavement Preservation
Poor Fair Good Excel
Lane
Mile
s
Pavement Preservation
Far less expensive to keep good pavements good.
Treat the pavement early before distress becomes severe.
The time window is narrow for optimal performance.
#1
#3
PM Overlay by Initial Surface Score
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6
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8
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Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9Y10Y11
Project Age
Surfa
ce S
core Score 6
Score 7
#2
Poor Fair Good Excel
Lane
Mile
s
Key Concept of Pavement Preservation
Pavement Preservation Tools• Crack Sealing• Chip Seal• Quick-set Slurry• Microsurfacing• Paver-Placed
Surface Treatment• 6.3mm HMA• Single Course HMA• Mill and Fill• Cold Recycling
Crack Sealing
No.
Preservation Strategy
• Keep good pavement good.
• Choose the right treatment at the right time.
• Serve the most number of travelers with each dollar.
• Prioritize segments by cost effectiveness ($/VMT).
VMT
$ $$ $$
$$
“Cost Effectiveness”
$ / VMT
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Pavement Management
How do I implement a preservation strategy for
my roads?
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Step 1: Road Inventory
• Lay out Linear Reference
• Define road characteristics
• Create Rating Segments– Base on Maintenance history– Avoid short segments
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Step 2: Condition Assessment
• Choose an assessment method
• Keep it simple
• Annual or biannual cycle
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Step 3: Prioritization Strategy
• Preservation ($/VMT)
• Worst-first
• Minimum conditions
• System Tier
The End.
Rick BennettPavement [email protected]
