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

For Each Maintenance Treatment An 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

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

Recommended Applications Surface Treatments

Recommended Applications Patching

Asphalt Maintenance Techniques

Equivalent Annual Cost ( EAC) = Unit Cost/Years of Life TreatmentUnit Cost Approximate Life (Years) EAC Crack Sealing$1.00 / lf2 – 3$0.40 Fog Seal$0.20/yd 2 3 – 4$0.04 Chip Seal$0.55/yd 2 3 – 6$0.12 Slurry Seal$1.50/yd 2 3 – 5$0.38 Micro-surfacing$1.75/yd 2 5 – 8$0.27 Ultra Thin Bonded Overlay $2.90/yd 2 8 – 10$0.32 Thin Overlay$3.00/yd 2 2 – 10$0.43

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 Right Treatment Depends on

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!

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

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

Definition of Pavement Preservation The right treatment, At the right time, On the right project.