Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
12 December 2012
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Presentation Outline 1. Introduction 2. PMS vs. PMMS 3. General Methodology of M&R Works 4. Types of Pavement Maintenance 5. Overview on Pavement Data Collection 6. Maintenance and Rehabilitation Polices 7. Challenges in Making Maintenance Decisions 2
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Presentation Outline 1. Introduction 2. PMS vs. PMMS 3. General Methodology of M&R Works 4. Types of Pavement Maintenance 5. Overview on Pavement Data Collection 6. Maintenance and Rehabilitation Polices 7. Challenges in Making Maintenance Decisions 3
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
1. Introduction Transportation Engineering
Air
Surface Transportation
Railway
Roadway
Water
Airport
Pavement Transportation
Planning
Design
Construction
Operations
Maintenance 4
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
1. Introduction (Cont’d) Weathering & Surface Deterioration
Potholes
Drainage, Subgrade and Base Failure
Why and How Pavements Fail
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
1. Introduction (Cont’d) Environment
Traffic Materials
Pavement Layers Subgrade (Natural Soil)
Pavement Design is affected by three main factors
- Traffic
- Materials
- Environment 6
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
1. Introduction (Cont’d) Types of Pavement Failure Structural Failure: includes a collapse of the pavement structure or breakdown of one or more of the pavement components.
Functional Failure: may or may not be accompanied by structural failure (Discomfort to passengers) 7
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
1. Introduction (Cont’d)
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
1. Introduction (Cont’d) Performance vs. Design Life
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
1. Introduction (Cont’d) Routine Maintenance Applied Preventive Maintenance Applied
Serviceability
New Cycle
Reconstruction Without Maintenance
Unacceptable Level for Serviceability Defer the Need for Reconstruction 14
18
25
Time (Year)
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
1. Introduction (Cont’d) Structural Distresses: Flexible
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
1. Introduction (Cont’d) Functional Performance
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Presentation Outline 1. Introduction 2. PMS vs. PMMS 3. General Methodology of M&R Works 4. Types of Pavement Maintenance 5. Overview on Pavement Data Collection 6. Maintenance and Rehabilitation Polices 7. Challenges in Making Maintenance Decisions 13
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
2. PMS vs. PMMS PMS Definition 1990 AASHTO Guidelines for PMS “A Pavement Management System is designed to provide objective information and useful data for analysis so that highway managers can make consistent, cost-effective, and defensible decisions related to the preservation of a pavement network.�
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
2. PMS vs. PMMS (Cont’d) Need for PMS • Agencies traditionally focused on new construction • Maintenance & rehabilitation managed with less formal methods • Crisis management • Plan maintenance & rehabilitation • Structured and documented procedures for spending money • Transportation and world changes • Need to continually update information • Necessary to make informed decisions
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
2. PMS vs. PMMS (Cont’d) Major Components of a PMS
• • • • • • •
Planning and programming Analysis Design Construction Maintenance Evaluation Research 16
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
2. PMS vs. PMMS (Cont’d) PMS Pavement Planning Pavement Design Pavement Construction PMMS
Pavement Maintenance
PMMS Asphalt
Side Walk
Bridge
Signs
Pavement Evaluation Pavement Research
PMMS versus PMS
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
2. PMS vs. PMMS (Cont’d) Major Components of a PMS
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Presentation Outline 1. Introduction 2. PMS vs. PMMS 3. General Methodology of M&R Works 4. Types of Pavement Maintenance 5. Overview on Pavement Data Collection 6. Maintenance and Rehabilitation Polices 7. Challenges in Making Maintenance Decisions 20
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012) Initiation
Main Roads
Referencing Methods -Route milepost -Node-Link -Branch-Section -GIS
Types of Surveys -Pavement Distresses -Deflection Measurements (FWD) -Roughness Measurements -Skid Resistance
Condition Data
Pavement
Network Identification
Sector Roads
Data Collection & Survey
Routine/Emergency Maintenance (Monthly/Weekly Survey)
Major (Preventive/Rehabilitation) Maintenance Data Collected Types Condition Data (Yearly)
Traffic Data
History Data
Localized Damages for: -Asphalt Pavement -Traffic Signs -Curb-Stones -Tiles -Lighting -Humps -Fence/Guard Rail -Road Marking -Footpath/Shoulder -Median -Storm Water -Sand Movements -etc.
Inventory Data
Structures
Geotechnical Data
Hydrological Data
Engineering/ Services Data
Lighting Other related facilities
Minor Roads
Data Analysis -Pavement Condition Analysis -Pavement Performance Analysis -Investment Analysis -Engineering Analysis
Municipal Planning and Development Objectives
Project Level Network Level Field Measurements -Establishing Pavement Preservation Policies -Identifying Priorities -Estimating Funding Needs -Allocating Budgets -Preparing Maintenance Program -Developing Short-Term/Long-Term Rehabilitation Strategies
Methodology for Road Maintenance and Rehabilitation Works (By: Abo-Hashema)
Material Investigation
Road Features, Geometric Assessment, Other data, etc.
Resource, Productivity Quality Control
Decision Tree
Implementation
Maintenance Decision Maintenance Alternatives Economic Analysis
Monitor & Review
Recommended Decision Modification/Adjustment
Detailed Work Schedule As-Built Design Technical Report
Final Work Order
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Kuwait Integrated Maintenance Management System (KIMMS) The current component systems of KIMMS consists of the following: • Pavement Management System (PMS) • Bridge Management System (BMS) • Right-of-Way Feature Management System (RFMS) • Sanitary Sewer Network Management System (SANS) • Storm Sewer Network Management System (STNS) • Work Management System (WMS)
M.A. Karan, Abdul Aziz Al-Kulaib, Ralph Haas, Paper # 197, 5th International Conference on Managing Pavements (2001) 22
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
KIMMS
General Framework
M.A. Karan, Abdul Aziz Al-Kulaib, Ralph Haas, Paper # 197, 5th International Conference on Managing Pavements (2001)
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Presentation Outline 1. Introduction 2. PMS vs. PMMS 3. General Methodology of M&R Works 4. Types of Pavement Maintenance 5. Overview on Pavement Data Collection 6. Maintenance and Rehabilitation Polices 7. Challenges in Making Maintenance Decisions 24
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
4. Types of Pavement Maintenance • Emergency Maintenance • Routine Maintenance • Preventive Maintenance • Corrective Maintenance (Rehabilitation/Reconstruction)
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Emergency Maintenance
Safety Accidents Weathering
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Routine Maintenance
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
4. Types of Maintenance (cont’d) Preventive Maintenance: Performed to improve or extend the functional life of a pavement. It is a strategy of surface treatments and operations intended to retard progressive failures and reduce the need for routine maintenance and service activities.
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Preventive Maintenance
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
4. Types of Maintenance (cont’d) Corrective Maintenance: Performed after a deficiency occurs in the pavement, such as loss of friction, moderate to severe rutting, or extensive cracking. May also be referred to as “reactive� maintenance. Corrective maintenance activities include structural overlays, mill and overlays, and total replacement.
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Rehabilitation/Reconstruction Maint.
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Presentation Outline 1. Introduction 2. PMS vs. PMMS 3. General Methodology of M&R Works 4. Types of Pavement Maintenance 5. Overview on Pavement Data Collection 6. Maintenance and Rehabilitation Polices 7. Challenges in Making Maintenance Decisions 33
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection Database is foundation of a PMMS Two Important Rules
• Collect only the data you need! • Collect the data only when you need it!
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d)
Data Collection Requirements Data must be: Relevant Reliable Cost effective to collect Cost effective to maintain
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d) Quality Control/Assurance of Data • • • • • •
Integrity Accuracy Validity Security Survey crew training Daily and periodic equipment calibration according to manufacturer’s specifications 36
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d) Types of Data
1. Office Data 2. Field Data
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d) 1. Office Data 1. Available maps and codes from previous studies for highway definition 2. Historical related data • • • • •
Construction date Types of pavement layers and thicknesses Cross section elements Major maintenance activities and their date Cost of different previous activities
3. Traffic Volumes: including data from permanent and temporary stations 4. Minor and major maintenance costs: these values were used to determine the financial needs of the network maintenance 39
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d) 2. Field Data Methods of Collecting Field Data 1. Photographic/Video logs
Fast Less expensive Limited viewing area Requires more post processing
2. Field survey teams
Slower More expensive Better reporting of field conditions Requires more preparation
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d)
2. Field Data Types of Field Data
• Inventory Data
• Condition Survey • Traffic Data
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d) Types of Condition Surveys
A. B. C. D.
Distress Survey Structural Capacity (Deflection Measurements) Roughness (Ride Quality) Skid Resistance (Surface Friction)
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d) Types of Distress Data
• Type of distress • Severity Level • Quantity of distress present on the pavement
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Depression
Alligator Cracking
Shoving Block Cracking
Edge Crack
Longitudinal Cracking
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Patching
Pothole
Lane-To-Shoulder Drop Off
Raveling
Bleeding
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d)
Methods of Distress Data Collection • Visual survey • Automated Data Collection Laser technology Film-based systems Video systems
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d) Visual Inspection Sample unit – 100 meters
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Distress Collection
Asphalt Pavement Inspection Sheet
Distress Map
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d)
Automated Distress Surveys • Increase speed and ease of data collection • Reduce transcription errors • Increase consistency between classification and quantification • Increase safety of field crews
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d)
Automated Distress Surveys
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d) The PCI is used in Micro PAVER for pavement condition rating. It is determined based on existing distresses in the pavement. It agrees closely with the collective judgment of experienced pavement maintenance engineers. 56
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
PCI Rating Scale
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
5. Overview on Data Collection (Cont’d) 1. 2. 3. 4. 5. 6. 7. 8. 9.
Distress Types: Alphabetical Listing Alligator Cracking 10. L&T Cracking Bleeding 11. Patching Block Cracking 12. Polished Aggregate Bumps and Sags 13. Potholes Corrugation 14. Railroad Crossing Depression 15. Rutting Edge Cracking 16. Shoving Jt Reflection Cracking Lane/Shldr Drop Off 17. Slippage Cracking 18. Swell 19. Weathering & Raveling 58
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Presentation Outline 1. Introduction 2. PMS vs. PMMS 3. General Methodology of M&R Works 4. Types of Pavement Maintenance 5. Overview on Pavement Data Collection 6. Maintenance and Rehabilitation Polices 7. Challenges in Making Maintenance Decisions 59
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
6. Maintenance and Rehabilitation Polices
Types of Maintenance Treatments A. Crack Sealing B. Fog Seal
C. Sand Seal D. Slurry Seal E. Chip Seal F. Patching G. Milling & Overlay
H. Reconstruction 60
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
6. Maintenance and Rehabilitation Polices (Cont’d)
Hot Air Lance
Crack Router
Crack Saw
Crack Saw
Crack Sealing
Compressed Air 61
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
6. Maintenance and Rehabilitation Polices (Cont’d)
Squeegee
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
6. Maintenance and Rehabilitation Polices (Cont’d)
General Procedures for Crack Sealing
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
6. Maintenance and Rehabilitation Polices (Cont’d)
Finished Crack Seal
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
6. Maintenance and Rehabilitation Polices (Cont’d)
Slurry Seal
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
6. Maintenance and Rehabilitation Polices (Cont’d)
Slurry Seal
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Patching
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Patching
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Milling & Overlay
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Presentation Outline 1. Introduction 2. PMS vs. PMMS 3. General Methodology of M&R Works 4. Types of Pavement Maintenance 5. Overview on Pavement Data Collection 6. Maintenance and Rehabilitation Polices 7. Challenges in Making Maintenance Decisions 70
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions
How can we get the Maintenance Decision?
3R
3W
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
How can we get the Maintenance Decision?
Right Treatment
on the Right Pavement at the Right Time 72
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
How can we get the Maintenance Decision? What is the suitable Maintenance Decision?
What 73
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
How can we get the Maintenance Decision? Where is the suitable section To begin with?
Where 74
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
How can we get the Maintenance Decision? When should be applied?
When 75
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
How can we get the Maintenance Decision?
What
Where
When 76
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
What • Distress-By-Distress
• Surface Treatment • Milling & Overlay • Reconstruction
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
Maintenance Alternatives Number of Sections
3 Sections
What
Maintenance Alternatives
Do Maintenance Do Nothing Number of Sections
(Maintenance Alternatives) 3
2 = 8 Alternatives 78
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
Maintenance Alternatives
Number of Sections 10 Sections
What
Maintenance Alternatives Do Maintenance Do Nothing Number of Sections
(Maintenance Alternatives) 10
2 = 1024 Alternatives 79
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
Maintenance Alternatives Number of Sections 200 Sections
What
Maintenance Alternatives Do Nothing Surface Treatment Milling & Overlay Reconstruction for AC Layers Reconstruction up to Subgrade Number of Sections
(Maintenance Alternatives) 200
5
= Number cannot be written 80
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
Maintenance Decision
What
Decision Tree 81
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
What
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
What
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
What
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
10 Distress Types 1
L
M
2
H
L
M
What
3
H
L
M
10
H
L
M
H
Huge Number of Condition States
1
2
3
7
M&R Alternatives Schematic Illustration of the Relationships Between Distress Levels and Maintenance Alternatives
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
10 Distress Types
1
L
M
2
H
L
M
What
3
H
L
M
10
H
L
M
H
Distress-By-Distress Repair
Patching
1
Crack Sealing
2
Localized Repair State
Surface Dressing
3
7
M&R Alternatives Schematic Illustration of Reducing the Number of Analysis Using Localized Maintenance
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
The MU system
This figure can be utlized to get the total MU value for a specific section based on density of localized maintenance.
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
The MU system
Using the total MU value, the recommended maintenance decision can be determined. Although, the weighting process was performed using data from developing countries such as Egypt, the MU system could be used worldwide. However, the weighting points of the MU system might be changed accordingly. 88
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
The MU system (Detailed Example)
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
The MU system •
•
Such an index, unlike decision trees, can be modeled to identify future maintenance needs Therefore, Maintenance Decision Model (MDM) was developed by Abo-Hashema et.al.
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
The MU system •
•
Such an index, unlike decision trees, can be modeled to identify future maintenance needs Therefore, Maintenance Decision Model (MDM) was developed by Abo-Hashema et.al.
MU F MU C ebY Where "MUF" is the Future MU value, "MUC" is the current MU value at zero-year, "Y" is number of years at designated time of MUF starting from the current year, and "b" is slope factor depending on climatic zone, %Truck, AADT, and SN
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
The MU system %Truck , AADT Slope Factor (b) f SN
Abo-Hashema, M.A. and Sharaf, E., "Development of Maintenance Decision Model for Flexible Pavements", International Journal of Pavement Engineering, ISSN 1029-8436, Taylor & Francis, Issue publication: Volume 10, Issue 3, June 2009, pp. 173-187. 92
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
Where
Maintenance Priorities
Constrains
Optimization
V. High Traffic Vol.
Fair
Medium Traffic Vol.
Very Good
High Traffic Vol.
Very Poor
Low Traffic Vol.
Good
High Traffic Vol.
Poor
Worst-First + Traffic Volume
Ranking Models
Worst First
Ranking Models93
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
Pavement Condition
Effect of Treatment Timing on Costs When Maintenance %Increasing Cost/Sq. Meter $3 Base Point
30% of Service Life
$27
60% of Service Life 75% of Service Life
9 Times
$60
20 Times
$….
….. Times
Years 94
Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
Material Investigation
2� crack
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
Decision should rely on: • Pavement Surface Condition • Material Investigation • Geometric Alignment
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
7. Challenges in Making Maintenance Decisions (Cont’d)
Economic Analysis Present Value = 553000
Alternative - 1 Distress-By-Distress Repair: Crack Sealing & Patching
1
0
2
3
4
5
Maint. Cost 13150 13150 (Derhams) 13150 13150
6
7
Maint. Cost Derhams
11
12
13
14
2
3
15
16
17 18
19
13150 13150 13150 13150 13150
658.14
Alternative - 2 Milling & Overlay 4
5
9863 9863 9863 9863
175964
10
13150 13150 13150 13150 13150 13150 13150 13150 13150
Present Value = 685000
1
9
359.289
65.814
0
8
Years 20
6
7
8
9
10
11
12
13
14
9863 9863 9863 9863 9863 9863 9863 9863 9863
359.289
15
16
17 18
19
Years 20
9863 9863 9863 9863 9863
157.964
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Overcoming Challenges in Making Road Maintenance Decisions (Wednesday 12 December 2012)
Thank you Mostafa Abo-Hashema
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