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Integrating Preventive Maintenance Into Pavement Management Systems

Integrating Preventive Maintenance Into Pavement Management Systems. Katie Zimmerman, P.E. David Peshkin, P.E. Applied Pavement Technology, Inc. (APTech) www.pavementsolutions.com. Setting the Stage. Pavement Preservation:

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Integrating Preventive Maintenance Into Pavement Management Systems

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  1. Integrating Preventive Maintenance Into Pavement Management Systems Katie Zimmerman, P.E. David Peshkin, P.E. Applied Pavement Technology, Inc. (APTech) www.pavementsolutions.com

  2. Setting the Stage • Pavement Preservation: “all activities undertaken to provide and maintain serviceable roadways; this includes corrective maintenance and preventive maintenance as well as minor rehabilitation projects” (FHWA)

  3. Traditional Approaches to Preservation • Highest priority is given to corrective activities to address safety needs • Treatments are triggered when a pavement section falls below an acceptable level • Funding for routine maintenance is typically unreliable, so treatment application cycles vary

  4. Serviceability Unacceptable Condition Time Rehabilitation Applied Typical Pavement Cycle Routine Maintenance Applied Over Time

  5. More Recent Trends • Integrate preventive maintenance into planning and design activities • Reduce the life cycle cost of preserving a pavement through the use of preventive maintenance • Keep good roads in good condition • Planned, early application of preventive maintenance treatments

  6. Reduced rate of deterioration after the application of preventive maintenance Rate of deterioration with only routine maintenance Serviceability Unacceptable Condition Time Deferred Need for Rehabilitation Modified Pavement Cycle

  7. Challenges to the Use of Preventive Maintenance • Agencies find it difficult to address roads in good condition when they have a large backlog • Agencies haven’t set a goal for what they want to accomplish with their preventive maintenance program • The funding isn’t dedicated to the program

  8. Factors Influencing Integration • Maintenance and rehabilitation are often programmed by different groups within the highway agency • Maintenance activities are frequently not reported in accordance with a referencing system used by pavement management • The same maintenance treatment can be used as a preventive, corrective, or stop-gap treatment

  9. How Do We Integrate These Programs? • Pavement Condition Surveys • Are surveys collecting the information needed? • Pavement Condition Indexes • Do they provide guidance regarding the appropriate treatment? • Pavement Performance Models • Is the performance of treatments reflected? • Treatment Rules • Are preventive maintenance treatments recommended?

  10. Condition Surveys and Indexes • Type of Index • Composite versus individual indexes • Survey Procedures • In some cases, survey procedures work against a preventive maintenance program • South Dakota patching example

  11. SDDOT Survey Procedures • Rate each 0.250-mile section of road • Identify distress type, severity, and extent • Distress reported on flexible pavements • Transverse cracking • Fatigue cracking • Patching • Block cracking • Also report rutting and roughness • Use a 0 to 5 rating scale

  12. Rating Procedures 0.250-mile Rate patch condition and rate distress showing through the patch Only distress are rated (not patch)

  13. Treatment Trigger Impact on Condition Indexes

  14. Treatment Trigger Impact on Condition Indexes

  15. Pavement Performance Models • Must know the date the treatment is performed • Difficult to account for differences in pavement performance based on differences in treatment use (preventive vs. stop-gap)

  16. Treatment Rules • Determine when each treatment is feasible • Define the “reset” rules that apply after the treatment has been selected for a section • Do all indexes return to a perfect score? • What performance model is used? • Check reasonableness of rule using historical data

  17. Verifying Treatment Rules Block Cracking

  18. Verifying Treatment Rules Fatigue Cracking

  19. Demonstrating Benefits • North Carolina DOT Example • Recent legislation supported preventive maintenance efforts • Allowed the use of accumulated funds in the Highway Trust Fund ($470M) • Funds used to “jumpstart” the pavement preservation efforts • The DOT added additional funds • Used pavement management to demonstrate benefits

  20. NCDOT Simulation • 1000-mile network • Distribution of network conditions based on actual conditions • Evaluated a “worst first” strategy • 50 miles of roads in poor condition resurfaced • Evaluated a “pavement preservation” strategy (PavePres) • 100 miles of roads in fair condition addressed first before roads in poor condition

  21. NCDOT Simulation Results

  22. Conclusion • There are technical issues that have to be addressed to successfully integrate preventive maintenance treatments into a pavement management system • Even after the technical issues are addressed, there are still institutional issues that have to be addressed

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