1. Pavement Management Engineer
Sarah McDougall
Pavement Management Engineer
M&R Workshop – Feb 19th 2014

2. Delaware’s Roads
State of Delaware Maintains 89% of the mileage in the state
4,400 centerline miles of State Maintenance
1,500 centerline miles of Suburban Streets
The Pavement Management Team (PMT) is responsible for the maintenance and rehabilitation of State Maintenance Mileage

3. Pavement Management Performance Measures
Overall Pavement Condition (OPC)
Good – OPC>60
Fair – OPC between 50 and 60
Poor – OPC<50
Goal: 85% of roads in good or fair condition with no more than 10% rating fair
2013 Ratings: 99% of state maintenance roads have an OPC of 50 or greater
All but 60 miles of State maintenance roads

4. Pavement Management Basics
Avoid a “worst first” mentality
Fewer miles would get done spending large amounts of money reconstructing poor pavements
More miles can be rehabbed for the same budget with roads that are in fair condition
We need a mix of preservation, rehabilitation, and reconstruction to keep the overall road network in good condition
Pavement Deterioration Curve
A pavement needing reconstruction is not going to get much worse…a pavement in fair condition though, can quickly deteriorate into poor

5. List for Bond Bill Approval
How do we do this?
DelDOT’s Pavement and Rehabilitation program strives to maintain the condition of its roadways by systematically identifying candidates for rehabilitation and determining the most cost effective treatment
Road rating
OPC score
Candidate List
PMT Scoring
Prioritization Score
Scoping List
Scoping Trips
Location Remedies
List for Bond Bill Approval

6. Road Rating
Semi automated condition survey collected every other year by consultant contract
Semi automated: combination of visual condition evaluation along with computer measurements of roadway distresses
Video Van collection of images and measurements which are reviewed and analyzed in office

7. OPC = Mean of index values -1.25 x Standard deviation
Determining OPC
Analysis to determine OPC completed by same consultant agreement that collects data
Roads are divided into rating segments
Each pavement type has a set of distresses that are looked for and evaluated by severity and extent
Pavement types: Flexible, Rigid, Composite, Surface Treatment
Severity and Extent each rated as Low, Medium, or High
Using a set of distress indices based severity and extent rating, OPC is calculated using the following formula:
OPC = Mean of index values x Standard deviation
OPC is on a scale of 0-100, 100 being “perfect pavement”

8. Example Severity Extent Flexible Pavement Distresses: Fatigue Cracking
Deficiency
LOW
MEDIUM
HIGH
Fatigue Cracking
Fine parallel hairline cracks
Alligator crack pattern clearly developed
Alligator crack pattern clearly developed with spalling and/or distortion
Flexible Pavement Distresses:
Fatigue Cracking
Transverse Cracking
Block Cracking
Patch Deterioration
Surface Defects
Extent
Deficiency
LOW
MEDIUM
HIGH
Fatigue Cracking
0 - 9% (wheel path) %
> 25%

9. Fatigue Cracking Index
Example
Fatigue Cracking Index
If distress is not present
Index=100
Extent
Low
Medium
High
Severity 92 84 70 80 58 40 72 46 20
A index value is determined for every distress in the rating segments surface type classification and put into the OPC equation.
This is done for every state maintained rating segment in the state (in 2013 there was a total of 25,092 rating segments)

10. Interstates, Arterials
Candidate List
Pulled based on OPC thresholds by functional class
The list is reviewed to remove anything that is already approved as part of the paving list from a previous year
Functional Class
OPC Threshold
Interstates, Arterials
<70
Collectors
<60
Locals
<50

11. Prioritization Scoring
PMT field reviews all roads on the candidate list
Roads are given of score of 1-3 in the following categories:
Pavement Condition
Ride quality, distresses causing safety issues, etc.
ADT
Set scale for each functional classification
Functional Classification
Set scale for each function classification
Special Conditions/Transportation Needs
Types of facilities on road (farms, employment centers, schools, firehouse etc)
Pavement Management Team Modifier
Previous nominations, project linkage, safety concerns

12. Prioritization Scoring

13. Scoping Trips and Beyond
Each scoping location is looked at by various groups within DelDOT to choose the most suitable rehabilitation treatment
Materials and Research, Construction, Maintenance
Preliminary Cost Estimates are done, and the list is refined based on what the annual budget is assumed to be
Final list of Pave and Rehab candidates is sent over for approval in the annual Delaware Bond Bill
Also sent over for approval are lists complied for pavement preservation treatments such as microsurfacing, tar and chip, and thin overlay
Locations are nominated by maintenance districts
locations noted by PMT throughout the year
Once approval is given, refined estimates are started and packaged into contracts for construction

14. Questions?