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The Missing Link in Pavement Management October 24, 2015 Full-Depth Reclamation Symposium Presented by: Steve Lander, P.E. KERCHER ENGINEERING, INC. © Kercher Engineering, Inc.
Transcript of Full-Depth Reclamation Symposium - SCPAsecement.org/.../S_Lander-Missing-Link-In-Pvmt-Mgmt...The...
The Missing Link in Pavement Management
October 24, 2015
Full-Depth Reclamation Symposium
Presented by:Steve Lander, P.E.
KERCHER ENGINEERING, INC.© Kercher Engineering, Inc.
Agenda
• Critical Pavement Management System Issues
• Pavement Condition Surveys (PCS)
• Pavement Management Software
• Summary
• Questions
© Kercher Engineering, Inc.
Opening Questions
• Why are we here?
• What is the condition of your roadway network?
• Is it getting better?
• Is your pavement management program adequately funded?
• Are your current practices working?
• Are you selecting the right projects to maximize performance with the available resources?
© Kercher Engineering, Inc.
Challenges/Problem Statement
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1. Inadequate Roadway Funding– Does Council Fully Understand?
– Are Other Departments Getting Funding?
2. Forced into “Worst-First” Project Selection– Spending a Lot of Money in a Small Area
3. Catching Up Is Impossible– Float a Bond?
Solution/Missing Link
1. Perform a Regular PCS
2. Predictive Modelling– Leveraging the PCS Data
– Providing a Defensible Case
3. FHWA 3R’s– Repair Strategies (When, Where, What Type?)
– Multi-Constraint Optimization
• Doing things at the right time
© Kercher Engineering, Inc.
Pavement Condition Surveys (PCS)
© Kercher Engineering, Inc.
Pavement Condition Surveys
Measures the deterioration produced by use, environment and material aging
Data is Analyzed to Generate Decision-making Information
• Condition Repairs Costs Priorities
Collect only the Data that is required:
• More Cost-effective
• Higher Quality (less to focus on)
Goal: Quality Data, Not Quantity!!!
© Kercher Engineering, Inc.
Optimization
Pavement Condition Surveys
• A Good Evaluation requires a “SOLID” Understanding and Field Training
• Comprehensive Rating System
– Must reasonably reflect the true level of deterioration
– Distress Information:
• Type
• Severity
• Extent
© Kercher Engineering, Inc.
PCS Methods
• Visual Surveys (Windshield)– LTPP
– ITRE
– Paser
– Internal Rating System
• ASTM D6433 (Physical Measurement)
• Automated Data Collection (Van)
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PCS Frequency
FHWA Recommends:
Every 2 to 3 Years
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Why Is A Quality Pavement Management System So Critical?
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Size and Complexity of Network
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Many Variables
• Pavement Types• Soils • Drainage• Pavement Condition• Repair Alternatives
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• Functional Class• Truck Traffic• Speed Limits
Many Constraints/Challenges
Performance Goals
$0
$10
$20
$30
$40
2011 2013 2015 2017 2019
Needs (Backlog)
0
20
40
60
80
100
2010 2012 2014 2016 2018 2020
Funding SourcesOther Assets
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Timing is Very Critical!!!
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Reconstruction
MinorRehabilitation
PreventiveMaintenance
Rt. Maintenance
MajorRehabilitation
Cost of Delaying Maintenance
5 10 15 20
Excellent
Good
Fair
Poor
Very Poor
Minor Rehab$150,000
Rebuild$480,000
Surface Treatment$30,000
4 – 5 Yrs
25
Major Rehab$250,000
© Kercher Engineering, Inc.
Using The Right Mix of Fixes
© Kercher Engineering, Inc.
Thin “Overlays”
NAPA Report - IS 135
• Range of Life – 4 years to 17 years
• Median Life Expectancy – 7 to 10 years
1 Year Old 5 Years Old
© Kercher Engineering, Inc.
Pavement Treatments Utilize the Entire Tool Box
Crack Sealing Patching Microsurfacing
Ultra -Thin Bonded Overlay Cold In-Place Recycling Full-Depth Reclamation
There is a most Cost-effective Treatment for every combination of Distresses
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Analytics Matter!!!
Maximize Your Infrastructure Investment
Doing More With Less
Pavement Management Software
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Most Pavement Management Software
• Limited Flexibility– Generic Treatments
– Generic Decision Trees
– Generic Performance Models
– Generic Reports
• Ranking Prioritization– Not Integer Optimization
– 30% to 60% Less Effective than Optimization
• Single Composite Index (e.g. PCI)
© Kercher Engineering, Inc.
Pavement Age
Pave
men
t Co
nditi
on
VeryGood
VeryPoor
New Old
Preservation
Rehab
Reconstruction
What is the Most Cost-effective Treatment?
Transverse Cracks 30’ to 50’ c-c and Raveling
Localized Severe Alligator Cracks
Corrugations
3 Different Conditions with a PCI = 70-75
Crack Seal & Micro
Deep Patching
Thin Rehab
A Single Index would most likely Select a Surface Coat
Single Composite Index Shortfall for Treatment Selection
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Structural DeteriorationIndividual/Combined Indices & Treatment
Alligator Cracking
Edge Cracking
Potholes/Patching
Structural Index
Individual Index Combined Index Treatment
Structural Repair
No Maintenance
Patching (IF MS/HS)
Rehab
Reconstruction/FDR/CIR
100
95
65
40
0
© Kercher Engineering, Inc.
Environmental DeteriorationIndividual/Combined Indices & Treatment
Transverse Cracking
Block Cracking
Raveling
Environmental Index
Individual Index Combined Index Treatment
Environmental Repair
No Maintenance
Crack Seal (MS/HS)
Preventive Maintenance
Thick Rehab/CIR
Rehab
100
90
80
40
0
60
© Kercher Engineering, Inc.
Pavement Management Software
© Kercher Engineering, Inc.
AgileAssets Pavement Analyst
AgileAssets Pavement Analyst™ Software
• The Leading Pavement and Asset Management Software
• Predictive Modelling (“What If Scenarios”)
• Multi-Constraint Integer Optimization
• Tremendous Flexibility– VDOT> 57,000 centerline miles
– Rehoboth Beach, DE - 19 centerline miles
© Kercher Engineering, Inc.
AgileAssets Pavement Analyst Software
• Flexibility
Inventory Data
Condition Data
Pavement Types
Treatment Types
Decision Trees
Performance Models
Integrate with other Assets
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Optimization
Ensuring that the Utilization of Resources is Maximized
to achieve Desired Goals
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“Benefit” Calculation
Benefit of Applying Treatment = (A.B.C.) * Traffic Factor * ???
??? - Other Factors
AGE
CON
DIT
ION
Current Performance Model
Threshold Line
Decreased Performance Created by “Delaying”
• Less “Real” Improvement
• Lower Performance
• Less Benefit!!!
AGE
CON
DIT
ION
Current Performance Model
Threshold Line
Delaying Treatment
© Kercher Engineering, Inc.
Goal Of OptimizationProvide the Maximum Amount of Benefit
Reconstruction
MinorRehabilitation
PreventiveMaintenance
Rt. Maintenance
MajorRehabilitation
5 10 15 20
Excellent
Good
Fair
Poor
Very Poor
$150,000
$480,000
$30,000
25
$250,000
Optimal Timing
Optimal Timing
Optimal Timing
Sweet Spot
Sweet Spot
Sweet Spot
© Kercher Engineering, Inc.
Network Overall PCI
> 70
Constraint:Performance
Measures
(PCI)
Objective:
Minimize Cost
Multi-Constraint Optimized Scenario AnalysisMinimize
Cost Objective
Constraint No. 1Network PCI
Constraint No. 2 Network Level SIBy Classification
Local20% w/PCI < 30
Collectors10% w/PCI < 40
Arterials0% w/PCI < 40
LocalSI > 65
CollectorsSI > 68
ArterialsSI > 75
Constraint No. 3 % Below
Minimum Threshold
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Examples
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Buena Vista, VA56 Miles of Streets
Comparison:
Worst First vs. OptimizationInvestment Level: $600K/Year
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0
10
20
30
40
50
60
70
80
90
100
2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
PCI
Year
Worst First Optimized
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PCI = 54
PCI = 46
Pavement Condition Index (PCI)$600K/Year
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$2 Million
Backlog Cost (Unfunded Projects)$600K/Year
$0
$2,000,000
$4,000,000
$6,000,000
$8,000,000
$10,000,000
$12,000,000
$14,000,000
$16,000,000
$18,000,000
2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
Back
log
Cost
Year
Worst First Optimized
© Kercher Engineering, Inc.
Percent of Network Treated : Worst First$600K/Year
0.0%
5.0%
10.0%
15.0%
20.0%
25.0%
30.0%
35.0%
40.0%
2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
% o
f Net
wor
k Le
ngth
Year
Worst First %
Worst First %
Optimized 10 Year Treated Length = 27 Lane Miles
© Kercher Engineering, Inc.
Percent of Network Treated : Optimized$600K/Year
0%
5%
10%
15%
20%
25%
30%
35%
40%
2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
% o
f Net
wor
k Le
ngth
Year
Optimized %
Optimized %
Optimized 10 Year Treated Length = 76 Lane Miles
© Kercher Engineering, Inc.
Percent of Network Treated: Comparison$600K/Year
0%
5%
10%
15%
20%
25%
30%
35%
40%
2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
% o
f Net
wor
k Le
ngth
Year
Optimized % Worst First %
Optimized 10 Year Treated Length = 27 Lane Miles
Optimized 10 Year Treated Length = 76 Lane Miles
A Medium-Sized County
900 Miles of Streets
Comparison:
Reconstruction vs. FDR
Investment Level: $10M/Year
Many Subdivision Streets are 8-15 year age range and needing attention soon
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Overall Condition Index (PCI)The Same Annual Budget
© Kercher Engineering, Inc.
60
65
70
75
80
85
9020
15
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
FDR
Recon
PCI = 75.4
PCI = 72.3
Backlog - Utilizing Traditional Reconstruction vs. FDRThe Same Annual Budget
$0
$20
$40
$60
$80
$100
$120
$140
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
Mill
ions
FDR Thick Rehab Thin Rehab
$0
$20
$40
$60
$80
$100
$120
$14020
16
2017
2018
2019
2020
2021
2022
2023
2024
2025
Mill
ions
Recon Thick Rehab Thin Rehab
Traditional Reconstruction FDR
$0.00
$20.00
$40.00
$60.00
$80.00
$100.00
$120.00
$140.00
2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
Mill
ions Recon
FDR
Backlog Cost Total ComparisonThe Same Annual Budget
$35 Million
The Optimization Approach
• Why the Drastic Reduction in Backlog?
– Optimization selects the most-cost effective (optimal) set of projects to meet the Objective subject to One or More Constraints!
– Many more pavements are treated due to the software selecting the optimal mix of fixes!
The Missing Link• Regular PCS (Every 2 to 3 Years)
• Predictive Modeling– Defensible Case
• Project Selection– Multi-Constraint Integer Optimization
• FHWA 3R’s
© Kercher Engineering, Inc.
© Kercher Engineering, Inc.
Steve Lander, P.E.
KERCHER ENGINEERING, INC.
813-767-5090
www.kercherei.com
