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Driving Indiana’s Economic Growth. APAI 2010 ANNUAL MEETING. HOT TOPICS MEPDG DARWin-ME ALTERNATE PAVEMENT DESIGN SAFETY EDGE. PAVEMENT DESIGN. MECHANISTIC EMPIRICAL PAVEMENT DESIGN GUIDE (MEPDG) Mechanistic Models Traffic Climate Materials. MEPDG (Analysis Tool) .

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APAI 2010 ANNUAL MEETING

HOT TOPICS

  • MEPDG

  • DARWin-ME

  • ALTERNATE PAVEMENT DESIGN

  • SAFETY EDGE


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PAVEMENT DESIGN

  • MECHANISTIC EMPIRICAL PAVEMENT DESIGN GUIDE (MEPDG)

    • Mechanistic Models

      • Traffic

      • Climate

      • Materials


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MEPDG (Analysis Tool)

  • Predicts Stresses and Strains

  • Predicts Pavement Distresses

  • Compares Distresses to Allowable

  • Calculates Reliability

  • Pass / Fail


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PAVEMENT DESIGN RESULTS

Thinner HMA

Thinner PCCP

RISK !

Pay Attention to the Subgrade


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MEPDG (Trial & Error)

  • DARWin-ME 1.0 Research Software

    • Run Time (one trial)

      • HMA 20 to 90 minutes

      • PCCP 15 to 30 minutes

    • Reliability

    • Final Design

      • Typically 2 to 5 runs

      • Thinnest not Exceeding Distresses


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Background

DARWin-ME supports AASHTO’s Mechanistic Empirical Pavement Design Guide published in 2008

Work product of NCHRP projects 1-37A and 1-40D

Nearly a decade of development

Base software: Freeware, available through the Transportation Research Board

DARWin-ME covers 17 pavement design situations

New concrete and asphalt pavements and various types of asphalt and concrete overlays


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DARWin-ME Inputs/Outputs

System Inputs

System Outputs

Project information

Design information

Materials & structure data

Traffic data

Climate data

Rehabilitation information

Initialization data

Input summary

Climate summary

Design pass/fail checks

Material properties summary

Pavement distress summary/charts


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DARWin-ME 2.0 Pooled Fund

  • Provide the transportation community with a production level, state-of-the-art software tool for the design of new and rehabilitated pavement structures consistent with AASHTO’s MEPDG


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DARWin-ME Planned Improvements

Efficiency

Increase software speed

Automated thickness optimization

Batch mode

Sensitivity

Functionality

SI version

Traffic caps

Stability

Correct reported bugs (Task Force directed)

Improve error handling


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DARWin-ME Task Force

Judy Corley-Lay (Chair), North Carolina

Marta Juhasz, Alberta, Canada

Jay Goldbaum, Colorado

Dave Andrewski, Indiana

Williams F. Barstis, Mississippi

J.F. Bledsoe, Missouri

Julian Bendana, New York

Madgy Mikhail, Texas

Trenton Clark, Virginia

Interested Agency Liaisons: Federal Highway Administration Transportation Association of Canada


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Current Project Status

Project solicitation issued in July 2008

Received commitments from 20 member agencies and the FHWA.

Sole Source Contract to ARA

Correct known bugs and those discovered during development

Incorporate enhancements outlined in solicitation

Alpha testing completed November 2010

Beta testing by three agencies in November and December

Software Release April 11, 2011


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Opening Screen

GENERAL INFO

ANALYSIS PARAMETERS

EXPLORER WINDOW

RUN

PROGRESS

PAVEMENT STRUCTURE

LAYER PROPERTIES

ERROR LIST




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Pavement Structure

Layers can be added/removed using visual aid

Layer labels editable

Layer represented graphically

Layering check to disallow illegal entries



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MaterialProperties–PCC


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Material Properties – Non-Stabilized Materials & Subgrade



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Traffic

HIGHWAY CAPACITY

TRAFFIC INPUTS

VEHICLE CLASS

MONTHLY ADJUSTMENT

HOURLY

ADJUSTMENT

AXLES PER TRUCK


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Highway Capacity Limits

  • Freeway

  • Multilane highway

  • 2-lane highway

  • Level

  • Rolling

  • Urban

  • Rural




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Runtime Improvements

UR01 – Asphalt pavement type analysis shall be improved to be completed within 15 minutes

PC comparisons – PRELIMINARY RESULTS

Overall* - time measure does not include Summary process for Excel report generation


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License Fees for FY2011

Individual License 1 - The single user license allows for only one user. For two, three or four users, multiple single user licenses will have to be purchased.

Single user - $5,000

Site License 1 - Site licenses based on the number of users and single user licenses will be available for DARWin-ME. The unlimited site license allows use of DARWin-ME on an unlimited number of workstations within an agency, and permits cities/counties, and contractors/consultants employed by the agency, access to the product on the Member Department’s network.

Site License – up to 9 users $20,000

  Site License – up to 14 users $30,000  

Site License – unlimited users $40,000

Educational License - will not be offered until FY 2012.

1 Because the software won’t be available until after the fiscal year has begun, license fees will be prorated for first time licensees.

License fees are annual

29


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ALTERNATE PAVEMENT DESIGN

A CONTRACT LET WITH DIFFERENT PAVEMENT TYPE OPTIONS (usually HMA & PCCP) THAT A CONTRACTOR CAN BID EITHER OR BOTH OPTIONS. DIFFERING DESIGN LIVES ARE ACCOUNTED FOR BY CALCULATING A 50 YEAR LIFE CYCLE COST FACTOR FOR EACH TYPE. THE WINNING BID IS THE LOWEST SUM OF THE BID PLUS THE FACTOR.


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HMA STRATEGY

  • 20 Year Initial Design Life

  • Joint Seal at Year 3, 6, 9, 12, 15, & 18

  • Mill and Functional Overlay at 20 Years

  • Joint Seal at Year 23, 26, 29, & 32

  • Mill and Resurface

  • Joint Seal at Year 38, 41, 44, & 47


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PCCP STRATEGY

  • 30 Year Initial Design Life

  • Reseal Joints at Year 8, 16, & 24

  • Mill and Functional Overlay at Year 30

  • Reseal Joints at Year 33, 36, & 39

  • Mill and Resurface at Year 42

  • Reseal Joints at Year 45 & 48


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50 Year Life Cycle Cost factor

  • > 10 PERCENT

    • USE LESS COSTLY

  • < 10 PERCENT

    • ALTERNATE BID

  • SPECIAL CASE

    • Settlement Areas

    • Presence of Distillates


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Contract Bid plus Factor

  • Initial Costs – Contractor’s Bid

  • LCCA (50 years) Present Value

    • HMA Strategy

    • PCCP Strategy


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RECENT CONTRACT FACTORS

  • HMA - $2,353,504.28

  • PCCP - $1,480,742.91




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