Selecting the Right Maintenance Treatment

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Selecting the Right Maintenance Treatment
Sponsored by Minnesota LTAP Center Presented
by Michael Marti, P.E. SRF Consulting
Group, Inc. Dan Wegman, P.E. SemMaterials
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For Each Maintenance TreatmentAn agency needs to
define

• Description/Purpose
• Timing
• Effects on various pavement distress
• Anticipated performance/service life
• Unit cost
• Roadway use/level of traffic
• Traffic control concerns
• Limitations
• Seasonal
• Availability of qualified staff and contractors
• Availability of quality materials
• Construction specifications

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Selection and Timing

• Type and extent of distress
• Climate and environmental factors
• Traffic loading
• Existing pavement type
• Cost of treatment
• Expected life
• Time of placement
• Facility downtime
• Surface friction

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Recommended Applications Surface Treatments
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Recommended Applications Surface Treatments
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Recommended ApplicationsPatching
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Asphalt Maintenance Techniques
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Equivalent Annual Cost (EAC) Unit Cost/Years
of Life
Treatment Unit Cost Approximate Life (Years) EAC
Crack Sealing 1.00 / lf 2 3 0.40
Fog Seal 0.20/yd2 3 4 0.04
Chip Seal 0.55/yd2 3 6 0.12
Slurry Seal 1.50/yd2 3 5 0.38
Micro-surfacing 1.75/yd2 5 8 0.27
Ultra Thin Bonded Overlay 2.90/yd2 8 10 0.32
Thin Overlay 3.00/yd2 2 10 0.43
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Right Treatment Depends on

• Existing pavement
• Type, structure, roughness, skid, distresses,
  climate, etc.
• Environment
• Climate, past future traffic, noise, etc.
• Life cycle costs
• Construction, maintenance, rehabilitation,
  user-delay costs, impact on local businesses,
  vehicle repair, etc.
• Available treatments
• Construction requirements, performance, costs,
  capabilities of local contractors

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Analysis Procedures for Most Effective Treatment

• A number of procedures for determining cost
  effectiveness exist and should be used
• Cost should be part of the decision process but
  not the only consideration
• Use of decision trees is a viable method
• Cost
• Life Cycle
• Pavement Management of Network
• User Delay
• Availability of Contractors
• Availability of Materials

Right Treatment, Right Time, Right Project Done
Right!
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Example of Selection Process

• Determine Rating Factors
• Assign Importance Value to Each Factor
• Percentage (must total 100)
• Rank each of the Available/Applicable Maintenance
  Treatments
• Calculate Totals

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Example of Selection Process
11-Year Old Pavement, 6000 ADT, Previously Seal
Coated, L-Block Cracking, L-Rutting, L-Polished

• Determine Rating Factors
• Cost
• How well it fixes distresses
• Traffic Disruption (during maintenance)
• Traffic Disruption (long term)
• Assign Importance Value to Each Factor
• Percentage (must total 100)
• Rank each of the Available/Applicable Maintenance
  Treatments
• Calculate Totals

• Determine Rating Factors
• Cost
• How well it fixes distresses
• Traffic Disruption (during maintenance)
• Traffic Disruption (long term)
• Assign Importance Value to Each Factor
• Percentage (must total 100)
• Rank each of the Available/Applicable Maintenance
  Treatments

• Determine Rating Factors
• Cost
• How well it fixes distresses
• Traffic Disruption (during maintenance)
• Traffic Disruption (long term)
• Assign Importance Value to Each Factor
• Percentage (must total 100)

• Determine Rating Factors
• Cost
• How well it fixes distresses
• Traffic Disruption (during maintenance)
• Traffic Disruption (long term)

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Definition of Pavement Preservation

• The right treatment,
• At the right time,
• On the right project.