Pavement Management Systems

Transcription

1 Pavement Management Systems Basics and Benefits David R. Johnson, P.E. Regional Engineer Asphalt Institute Rocky Mountain Region

2 Presentation Outline Definition Requirements Benefits Vehicle Analogy Process Preventative Maintenance Condition Survey Typical Outputs Large Agency Example Small Agency Example Recommendations

3 PMS Defined A Pavement Management System (PMS) is a set of tools for providing, evaluating, and maintaining pavements in a serviceable condition over a period of time AASHTO

4 What Does a PMS Entail? System Inventory Condition Survey Historical Information Current Status Budget Limits Repair Strategies Repair Alternatives Goals

5 A Properly Designed Pavement Management System (PMS) Can: Provide a Comprehensive Database Historical Information Construction Data Previous Maintenance Work Invested Amounts Current Conditions Surface Type Pavement Structure Shoulder Type Traffic Usually Summarized in a Single Condition Value

6 A Properly Designed Pavement Management System (PMS) Can: Estimate Budget Requirements Lobbying Provide a Prospective Project List Provide Repair Strategy Comparisons Predict Future Conditions Provide Prioritization Strategies Improve the Overall Quality of a Transportation System Link with a GIS Database Extend the Dollars Available for Roads How? The right treatment on the right road at the right time!

7 PMS is Like Auto Maintenance Auto Preventative/Routine Oil Change and Lube Fluid Changes Alignments Pavement Preventative/Routine Crack Seal Chip Seal Pothole Patching Thin Overlay Leveling Course

8 PMS is Like Auto Maintenance Auto Rehabilitation Break Pads/Shoes Replace Bearings New Tires New Wipers Pavement Rehabilitation Thick (Structural) Overlay Mill and Fill Overlay Full-Depth Patching

9 PMS is Like Auto Maintenance Auto Reconstruction Body Work Rebuild Engine Rebuild Transmission Pavement Reconstruction Recycle Pavement Cold In-Place Hot In-Place Full-Depth Reclamation Total Reconstruction

10 PMS Process Strategic Level usage of PMS to support the long-term goals of an agency at a management level. Network Level the entire transportation infrastructural system managed by the PMS. (Big Picture) Project Level and individual project for which a plan-of-action is developed to address its specific need. (Focused Perspective)

11 Network Level Define Limits System Inventory Historical Data Construction Maintenance Condition Survey Helps to determine needs Develop Maintenance Strategies Current Repair Needs Analyze Repair Costs Incorporate Available Dollars

12 Network Level Establish Goals Example: To have all flexible pavements at a minimum 70 rating out of 100. Determine Network Needs Prioritize Projects/Roads Interactive Process Select Projects Analyze Their Effects Review Choices Add/Remove/Change Projects

13 Network Level Provide System Feedback Budget Changes Revise Strategies Update Costs and Life Expectancies Updated Priorities

14 Project Level Distress Survey Extent of the Work Area Engineering Investigation Soil Samples Pavement Samples Existing Drainage Traffic Analysis

15 Project Level Design Alignment Surface Type Traffic Permitting Archeological Clearances Right-of-Way Construction/Maintenance Activities

16 What Happens to the Data? Inventory Data Decision Data Condition Data Feedback Data Analysis Reporting Feedback Make Decisions

17 Preventive Maintenance Pavement Preservation Improves the overall condition of the pavement network Extends pavement life Reduces user delays Improves road safety SAVES MONEY

18 Preventive Maintenance Identify available methods Select method Predict the results Run additional iterations This is generally done within a PMS

19 Treatment Selection Factors Affecting Selection Methods available Pavement distresses Distress severity Maintenance goals Available dollars Selection both an engineering and economic decision.

20 FHWA Preservation Methods Crack Sealing* Patching Fog Seals* Rejuvenation Sand Seal Chip Seal* Slurry Seal* Cape Seal Microsurfacing* Thin-Lift Overlay* Joint Sealing* Diamond Grinding* Dowel-Bar Retrofit* Partial-Depth Repair of PCC* Full-Depth Repair of PCC* *FHWA Checklist Available

21 Example FHWA Checklist

22 Condition Surveys for Unimproved Road Profile Ride Drainage Surface Material Crown Distresses Ruts Potholes Washboarding

23 Condition Surveys for Gravel Roads Profile Ride Drainage Crown Distresses Ruts Potholes Washboarding Dust

24 Condition Surveys for Sealed Roads (Chip Sealed) Wear and Flushing Chip Loss Edge Cracking Fatigue (Alligator) Cracking Potholes Patching

25 Condition Surveys for Asphalt Concrete Surfaces Ride (International Roughness Index IRI) Cracking Transverse Reflection Thermal Longitudinal Fatigue (Alligator) Edge Potholes Patching Surface Deformations Rutting Shoving Surface Defects Bleeding Polished Aggregate Raveling

26 Condition Surveys for Portland Cement Concrete Surfaces Ride (IRI) Cracking Corner Durability ( D ) Longitudinal Transverse Joint Defects Seal Damage Spalling Surface Defects Scaling Map (Shrinkage) Cracking Polished Aggregate Popouts Miscellaneous Distresses Faulting Blowups Water Bleeding and Pumping Lane-to-Shoulder Drop-off

27 Pavement Distresses

28 Remaining Service Life Estimated time until facility looses functionality. Typically reported in years. Often more easily explainable to legislators, managers, and the public.

29 Generic Deterioration Model 5 Pavement deterioration with maintenace or rehabilitation Present Serviceability Index % drop in quality 75% of life 40% drop in quality 12% of life $1.00 for Renovation here Pavement deterioration without maintenace or rehabilitation Will cost $5.00 here Years

30 Estimated Unit Costs For Different Repair Strategies Strategy Technique Approximate Cost Preventative Rehabilitative Reconstruction Chip Seal Unit Cost: $1.20/sq. yd. Overlay Unit Cost: $8.65/sq. yd. Reconstruction Unit Cost: $72.00/sq. yd. $19,000 $132,500 $1,100,000 One Mile Two-Lane Road

31 Repair Strategy vs. Condition 5 Note: All costs in units of dollars/square yard Present Serviceability Index Routine Maintenance ($1.20) Rehabilitation ($8.65) Reconstruction ($72.00) Years

32 Potential Mileage Addressed For Different Repair Strategies Strategy Technique Approximate Repair Miles Preventative Rehabilitative Reconstruction Chip Seal Unit Cost: $1.20/sq. yd. Overlay Unit Cost: $8.65/sq. yd. Reconstruction Unit Cost: $72.00/sq. yd Miles 7.5 Miles 0.91 Miles Assume $1,000,000 Annual Budget

33 Sample Life-Cycle Cost Model for Different Strategies Routine Maintenance ($19,000/Mile) Six chip seals on a 5-year interval over 30 years ($19,000 X 6) = $114,000 Total Cost Rehabilitative Maintenance ($132,500/Mile) Two overlays and two chip seals on a 15-year interval over 30 years ($132,500 X 2) + ($19,000 X 2) = $303,000 Total Cost Reconstruction ($1,100,000/Mile) Reconstruct on a 30 year interval $1,100,000 Total Cost Note: All dollars in present worth One mile of road

34 PMS Reports Data Base Functions Charts Tables Query Examples District Surface Type Age Condition Remaining Service Life

35 Example Pie Chart Current Condition of Surfaced Roads Very Poor 12% Excellent 10% Good 12% Poor 30% Fair 36%

36 Example Bar Chart Current Condition of Surfaced Roads Very Poor 12% Excellent 10% Good 12% Cost of Repairs Poor 30% Millions of Dollars Excellent Good Fair Poor Very Poor Fair 36% Pavement Condition Note: 42% of roads have 82% of the need in this example

37 Example Table Rural Road Needs Road Length Need Method Cost River Road Thomas Gulch Road Highway miles 3.7 miles Routine Maintenance Routine Maintenance 1.6 miles Reconstruction Crack Seal $71,500 Chip Seal $70,300 FDR w/ overlay $1,760,000 Total Cost $1,901,800.00

38 Real World Example - WSDOT Mid-1960s began collecting pavement condition ratings WSDOT implemented its first version of WSPMS legislature required project selection based on lowest LCCA. Based on LCCA, determined there is a 2-3 year window when flexible pavements can be rehabilitated.

39 Real World Example - WSDOT Hot-mix asphalt pavement: 17,342 lane-km (10,776 lane-mi), 60 percent of network. Bituminous surface treatment: 4,843 lane-km (4,843 lane-mi), 27 percent of network. Concrete pavement: 3,640 lane-km (2,262 lane-mi), 13 percent of network.

40 Real World Example - WSDOT From: FHWA Pub. IF

41 Real World Example - WSDOT From: FHWA Pub. IF

42 Real World Example Kent County Michigan Technique Cost Miles of Road Completed Cost per Mile* Chip Seals $202, $558 Microsurfacing Thin-Lift Overlay $262, $3,425 $761, $72,500 Source: Asphalt Contractor, Nov Note: Kent Co. maintains 1,968 miles of road 2007 Budget - $6 Million *Prices verified by Kent County

43 Real World Example Kent County Michigan Time Frame Activity Allocation Network Expansion 0.45/ Reconstruction 0.20/ Preserving and Maintaining Preserving and Maintaining 0.35/ /1.00 Goal: 70% of primary roads in good condition.

44 Real World Example Kent County Michigan Year Good (Maintain) Fair (Preserve) Poor (Reconstruct) % 40% 15% % % 28% 10% % 20% 10%

45 Recommendations Initiate an RFP Process or Internally Evaluate Currently Available PMS Software, and Choose a PMS Product Implement the PMS Political Buy-in Local Champion Provide Training to Practitioners

46 PMS Benefits Provides a Useful Database Roadway Information Location Surface type Historical information Current Conditions Provides a Comparison of Repair Options Cost Effective Life Provides Estimated Budget Requirements Provide Estimates for When Goals Will be Met

47 PMS Benefits Provides a Prediction of Future Conditions Provides a Prediction of Future Needs Helps with Prioritization Strategies Can Improve the Overall Quality of a Transportation System Can Extend the Use of Available Dollars

48 What a PMS Cannot Do Replace an Informed Decision Maker Substitute for Proper Maintenance Replace Individual Project Evaluations Make All Decisions Give All the Answers

49 Questions? Asphalt Institute publications that involve Pavement Management Systems MS-4 Asphalt Handbook MS-16 Asphalt in Pavement Preservation and Maintenance MS-19 Basic Asphalt Emulsions Manual _browse.asp?ic_id=11