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

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Presentation on theme: "Sarah McDougall Pavement Management Engineer M&R Workshop – Feb 19 th 2014 Pavement Management."— Presentation transcript:

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

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

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

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

5 o 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 How do we do this? Road rating Candidate List Prioritization Score OPC score PMT ScoringScoping List Scoping Trips Location Remedies List for Bond Bill Approval

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

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

8 Flexible Pavement Distresses: Fatigue Cracking Transverse Cracking Block Cracking Patch Deterioration Surface Defects SEVERITY DEFICIENCYLOWMEDIUMHIGH Fatigue Cracking Fine parallel hairline cracks Alligator crack pattern clearly developed Alligator crack pattern clearly developed with spalling and/or distortion Example EXTENT DEFICIENCYLOWMEDIUMHIGH Fatigue Cracking 0 - 9% (wheel path) 10 - 25%> 25%

9 Fatigue Cracking Index If distress is not present Index=100 Extent LowMediumHigh Severity Low928470 Medium805840 High724620 Example 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 o Pulled based on OPC thresholds by functional class o The list is reviewed to remove anything that is already approved as part of the paving list from a previous year Candidate List Functional ClassOPC Threshold Interstates, Arterials<70 Collectors<60 Locals<50

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


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

14 Questions?

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