Asphalt Pavement Maintenance Handbook沥青路面的维修手册.ppt

Selecting the Right Maintenance TreatmentSponsored by: Minnesota LTAP CenterPresented by: Michael Marti, P.E.SRF Consulting Group, Inc. Dan Wegman, P.E.SemMaterials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Recommended Applications Surface TreatmentsRecommended Applications Surface TreatmentsRecommended ApplicationsPatchingAsphalt Maintenance TechniquesEquivalent Annual Cost (EAC) = Unit Cost/Years of LifeTreatmentUnit CostApproximate Life (Years)EACCrack Sealing$1.00 / lf 2 – 3$0.40Fog Seal$0.20/yd23 – 4$0.04Chip Seal$0.55/yd23 – 6$0.12Slurry Seal$1.50/yd23 – 5$0.38Micro-surfacing$1.75/yd25 – 8$0.27Ultra Thin Bonded Overlay$2.90/yd28 – 10$0.32Thin Overlay$3.00/yd22 – 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 contractorsRight 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 MaterialsRight Treatment,Right Time,Right ProjectDone 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 tDetermine Rating FactorstCosttHow well it “fixes〞 distressestTraffic Disruption (during maintenance)tTraffic Disruption (long term)tAssign “Importance Value〞 to Each FactortPercentage (must total 100)tRank each of the Available/Applicable Maintenance TreatmentstCalculate TotalstDetermine Rating FactorstCosttHow well it “fixes〞 distressestTraffic Disruption (during maintenance)tTraffic Disruption (long term)tAssign “Importance Value〞 to Each FactortPercentage (must total 100)tRank each of the Available/Applicable Maintenance TreatmentsExample of Selection Process11-Year Old Pavement, 6000 ADT, Previously Seal Coated, L-Block Cracking, L-Rutting, L-PolishedtDetermine Rating FactorstCosttHow well it “fixes〞 distressestTraffic Disruption (during maintenance)tTraffic Disruption (long term)tAssign “Importance Value〞 to Each FactortPercentage (must total 100)tDetermine Rating FactorstCosttHow well it “fixes〞 distressestTraffic Disruption (during maintenance)tTraffic Disruption (long term)Definition of Pavement PreservationThe right treatment,At the right time,On the right project.。