performance-based approach to integrate pavement preservation into pavement management system
DESCRIPTION
To achieve accountablility, performance and transparency, local agencies will have to step up to the plate in the new transportation bill.TRANSCRIPT
Performance‐Based Approach to Integrate Pavement Preservation
into PMSSui Tan, MTC, DingXin Cheng, CPPC
Outline of Presentation
• Background and Objective• Study Approach• Target Driven vs Traditional• Study Results• Conclusions and Recommendations
Business As Usual ???
• New Transportation Bill focuses on: Performance Accountability Transparency
Investigation Approach
1. Maintain Current Funding Level2. Maintain Current PCI3. State of Good Repair (PCI = 75)
Vs
Fixed Budget
StreetSaver
Pavement Preservation and Rehabilitation Decision Tree
Functional Class Surface
Condition Category Treatment Type Treatment
Cost/Sq Yd,
except Seal
Cracks in LF:
Yrs Between Crack Seals
Yrs Between Surface Seals
# of Surface Seals before Overlay
Crack Treatment SEAL CRACKS $ 1.00 4Surface Treatment SLURRY SEAL $ 3.30 8Restoration Treatment
MILL AND THIN OVERLAY $ 20.05 3
II ‐ Good Non‐Load Related
RUBBERIZED CHIP SEAL $ 7.55 8
III ‐ Good, Load Related
THIN AC OVERLAY $ 24.95
IV ‐ PoorTHICK AC OVERLAY $ 37.25
V ‐ Very Poor
RECONSTRUCT STRUCTURE (AC) $ 98.75
I ‐ Very GoodACResidential / Local
Performance Measures
Remaining Service Life Threshold
•Remaining Service Life•Deferred Maintenance•Pavement Condition Index(PCI)
•Min % in Very Good Condition•Max % in Poor Condition
Deferred Maintenance Vs PCI
Case Study Scenarios
City of San Leandro
1046 sections178 center miles389 lane miles Current Network PCI = 53
City of Pinole
343 sections52 center miles119 lane milesCurrent Network PCI of 68
Maintain Current Funding
City of Pinole (PCI = 68)
City of San Leandro (PCI = 53)
TraditionalPerformance
BasedTraditional
Performance Based
Total Budget
$15.9 mil $14.0 mil $56.3 mil $49.7 mil
% PM 14.1% 18.3% 3.0% 21.8%
Maintain Current Funding
City of Pinole (PCI = 68)
City of San Leandro (PCI = 53)
TraditionalPerformance
BasedTraditional
Performance Based
RSL 19.0 25.5 11.4 11.6
Deferred Maint. $34.6 mil $16.0 mil $226.4 mil $232.2 mil
Maintain Current Funding
Maintain Current Funding
Maintain Current PCI
City of Pinole (PCI = 68)
City of San Leandro (PCI = 53)
TraditionalPerformance
BasedTraditional
Performance Based
Total Budget
$24.0 mil $20.4 mil $120.1 mil $117.0 mil
% PM 15.0% 26.2% 10.0% 11.5%
Maintain Current PCI
City of Pinole (PCI = 68)
City of San Leandro (PCI = 53)
TraditionalPerformance
BasedTraditional
Performance Based
RSL 23.4 23.3 18.2 17.7
Deferred Maint.
$20.3 mil $22.1 mil $138.6 mil $138.6 mil
Maintain Current PCI
Maintain Current PCI
State of Good Repair (PCI=75)
City of Pinole (PCI = 68)
City of San Leandro (PCI = 53)
TraditionalPerformance
BasedTraditional
Performance Based
Total Budget
$29.8 mil $29.7 mil $191.4 mil $194.0 mil
% PM 15.0% 26.1% 15.0% 14.5%
State of Good Repair (PCI=75)
City of Pinole (PCI = 68)
City of San Leandro (PCI = 53)
TraditionalPerformance
BasedTraditional
Performance Based
RSL 25.7 25.7 24.7 24.7
Deferred Maint.
$12.7 mil $8.4 mil $50.1 mil $33.0 mil
State of Good Repair (PCI=75)
State of Good Repair (PCI=75)
Conclusions
• Traditional fixed budget approach needs trial and error
• Target‐driven approach– Can quickly achieve the target objective – Provide better solutions than the traditional fixed
budget approach– Has more flexibility in funding levels– Promote cost effective pavement preservation
treatments– May not yield the best performance measures in all 4
categories.
Recommendations
• Target‐driven approach can be improved to a multiple objectives true network optimization
– Fast and reliable– Pavement preservation centric– Accommodate long term analysis– Ease of setting performance measures
ContactDingXin Cheng, Ph.D., P.E.
Director and Associate ProfessorCalifornia Pavement Preservation Center
California State University, ChicoChico, CA 95929
Tel: (530) 898‐5114Email: [email protected]
Sui Tan, P.E.StreetSaver Program Manager
Metropolitan Transportation CommissionOakland, CA 94607Tel: (510) 817‐5844
Email: [email protected]