Why Pavement Maintenance and Preservation?

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Why Pavement Maintenance and Preservation?
Sponsored by Minnesota T2 Center Presented
by Michael Marti, P.E. SRF Consulting Group,
Inc. Dan Wegman, P.E. SemMaterials
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What Are We Talking About?
Pavement Preservation
Maintenance
Pavement Management
Repair
Fix
Preventive Maintenance
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FHWADefinition of Pavement Preservation

• Pavement preservation is a strategically-planned,
  engineering-based program to arrest light
  deterioration, retard progressive failures,
  reduce the need for routine maintenance and
  maintain safety on the existing roadway system.
  It is a series of cost effective maintenance
  strategies to delay the onset of predicted
  distress. Pavement preservation does not
  significantly improve the load carrying capacity
  of pavements, shoulders, or structures, but
  extends the useful life and improves the level of
  service.
• FHWA

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Practical Definition of Pavement Preservation

• The right treatment
• At the right time
• On the right project
• Done right!

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FHWA Maintenance Needs vs Budget
Budget 27 billion
Needs Maintain 50 billion Eliminate backlog
210 billion
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Mn/DOT - Preventive MaintenanceFunding and
Operational Issues

• In 1999, spent 30 million maintenance
• Estimated need is 118 million!
• Centralized recommendations based on pavement
  management program
• Final decisions based on field review and local
  issues/input

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Types of Pavement Maintenance

• Corrective (reactive, rehabilitation)
• After deficiency occurs
• More expensive
• Preventive (proactive)
• Protective
• Retards deterioration
• Extends assets life
• Reduces need for corrective maintenance

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Why Pavement Preservation? Intuitive Argument

• Why do you change the oil in your car?
• Why do you paint the exterior of your house?
• You do them to preserve your initial investment
  and extend its life
• You dont measure how long they last
• Pavement preservation is the same concept.

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Pavement Lifecycle Typical Maintenance
Rehabilitation Strategies
Routine Maintenance
100
Defer Action
80
Rehabilitation
60
Reconstruction
PSI
(Pavement Serviceability Index)
40
20
0
Years
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Pavement Preservation Strategy
Preventive Preservation Treatments
Pavement Condition
Conventional Overlay
Time or traffic
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Theory Behind Pavement Preservation Timing
Excellent
40 drop in quality
Good
75 of life
Fair
Pavement Structural Condition
40 drop in quality
Poor
Very Poor
12 of life
Failed
20
15
10
5
Years
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Where is the Proof?

• Numerous studies/resources
• FHWA
• NCHRP
• NHI
• Foundation for Pavement Preservation
• LRRB
• Empirical facts vs Compelling data

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Where is the Proof? Current LRRB Study (Inv 861
Wood and Lukanen)

• 1256 sections (constructed since 1985, bituminous
  over gravel base)
• 597 no preservation ? 659 with preservation

Condition
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Where is the Proof? Current LRRB Study (Inv 861
Wood and Lukanen)

• 1256 sections (constructed since 1985, bituminous
  over gravel base)
• 597 no preservation ? 659 with preservation

Ride
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Where is the Proof?

• Rougher roads have higher user costs
• Therefore, pavement preservation yields lower
  user costs, but is it cost effective?

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Where is the Proof? TRB Report (Galehouse,
Moulthrop, and Hicks)

• TR News
• Economic analysis (LCCA)
• Based on typical costs and expectations

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Where is the Proof? TRB Report (Galehouse,
Moulthrop, and Hicks)
NoPreservation
WithPreservation
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Where is the Proof? TRB Report (Galehouse,
Moulthrop, and Hicks)

• Data supports familiar graphs

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Where is the Proof?

• Typical costs in Minnesota

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Benefits of Pavement PreservationPavement
Preservationdoing the right thing at the right
time.

• Preserving initial investment
• Extended life or serviceability
• Lower life-cycle costs
• Lower user costs
• Improved safety
• Improved budget planning
• Public support
• Based on this, use your own data to determine if
  its
• The RIGHT TIME to do the RIGHT THING?

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Establishing a Preservation Program

• Number of Technical Components
• Two most important components are non-technical
• Agency Top Management Commitment
• Education/Outreach Program

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What are some of the barriers?

• Paradigm Shift
• Moving from worst-first process
• Internal Issues
• Must be understood and accepted by all
• Must be committed to by top management
• Must have buy-in from work force
• Remove stigma that maintenance is less important
  or prestigious than new construction
• Marketplace Pressures
• Introducing new technologies
• Competition from industry (rehab and material
  suppliers)
• Public Perception
• Why are you fixing something that is not
  broken?

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Examples of Preventive Maintenance Techniques

• Crack sealing
• Chip seals
• Macro-surfacing
• Slurry seals
• Micro-surfacing
• Ultra-thin bonded wearing coarse
• Thin overlay
• Mill and overlay