Title: Why Pavement Maintenance and Preservation?
1Why Pavement Maintenance and Preservation?
Sponsored by Minnesota T2 Center Presented
by Michael Marti, P.E. SRF Consulting Group,
Inc. Dan Wegman, P.E. SemMaterials
2What Are We Talking About?
Pavement Preservation
Maintenance
Pavement Management
Repair
Fix
Preventive Maintenance
3FHWADefinition 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
4Practical Definition of Pavement Preservation
- The right treatment
- At the right time
- On the right project
- Done right!
5 FHWA Maintenance Needs vs Budget
Budget 27 billion
Needs Maintain 50 billion Eliminate backlog
210 billion
6Mn/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
7Types of Pavement Maintenance
- Corrective (reactive, rehabilitation)
- After deficiency occurs
- More expensive
- Preventive (proactive)
- Protective
- Retards deterioration
- Extends assets life
- Reduces need for corrective maintenance
8Why 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.
9Pavement Lifecycle Typical Maintenance
Rehabilitation Strategies
Routine Maintenance
100
Defer Action
80
Rehabilitation
60
Reconstruction
PSI
(Pavement Serviceability Index)
40
20
0
Years
10Pavement Preservation Strategy
Preventive Preservation Treatments
Pavement Condition
Conventional Overlay
Time or traffic
11Theory 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
12Where is the Proof?
- Numerous studies/resources
- FHWA
- NCHRP
- NHI
- Foundation for Pavement Preservation
- LRRB
- Empirical facts vs Compelling data
13Where 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
14Where 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
15Where is the Proof?
- Rougher roads have higher user costs
- Therefore, pavement preservation yields lower
user costs, but is it cost effective?
16Where is the Proof? TRB Report (Galehouse,
Moulthrop, and Hicks)
- TR News
- Economic analysis (LCCA)
- Based on typical costs and expectations
17Where is the Proof? TRB Report (Galehouse,
Moulthrop, and Hicks)
NoPreservation
WithPreservation
18Where is the Proof? TRB Report (Galehouse,
Moulthrop, and Hicks)
- Data supports familiar graphs
19Where is the Proof?
- Typical costs in Minnesota
20Benefits 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?
21Establishing a Preservation Program
- Number of Technical Components
- Two most important components are non-technical
- Agency Top Management Commitment
- Education/Outreach Program
22What 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?
23Examples of Preventive Maintenance Techniques
- Crack sealing
- Chip seals
- Macro-surfacing
- Slurry seals
- Micro-surfacing
- Ultra-thin bonded wearing coarse
- Thin overlay
- Mill and overlay