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)

Predicts Stresses and Strains Predicts Pavement Distresses Compares Distresses to Allowable Calculates Reliability Pass / Fail

PAVEMENT DESIGN RESULTSThinner HMAThinner PCCP

RISK !Pay Attention to the Subgrade

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

BackgroundBackground 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

DARWin-ME Inputs/OutputsDARWin-ME Inputs/Outputs

System Inputs Project information Design information Materials & structure

data Traffic data Climate data Rehabilitation

information Initialization data

System Outputs Input summary Climate summary Design pass/fail

checks Material properties

summary Pavement distress

summary/charts

DARWin-ME 2.0 Pooled DARWin-ME 2.0 Pooled FundFundProvide 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

DARWin-ME Planned DARWin-ME Planned ImprovementsImprovements

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

DARWin-ME Task ForceDARWin-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

Current Project StatusCurrent 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

GENERAL INFO

RUNPROGRESS

PAVEMENT STRUCTURE

LAYER PROPERTIES

ANALYSIS PARAMETERS

EXPLORER WINDOW

ERROR LIST

Opening Screen

DARWin-ME ToolbarDARWin-ME Toolbar

Project CreationProject Creation

Pavement StructurePavement Structure Layers can be

added/removed using visual aid

Layer labels editable

Layer represented graphically

Layering check to disallow illegal entries

Material Properties – ACMaterial Properties – AC

MaterialMaterial PropertiesProperties –– PCCPCC

Material Properties – Material Properties – Non-Stabilized Materials & Non-Stabilized Materials & SubgradeSubgrade

Material Properties – Material Properties – Stabilized LayerStabilized Layer

TrafficTrafficTRAFFIC INPUTS

MONTHLY ADJUSTMENT

AXLES PER TRUCK

VEHICLE CLASS

HOURLYADJUSTMENT

HIGHWAY CAPACITY

Highway Capacity LimitsHighway Capacity LimitsFreewayMultilane highway2-lane highway

LevelRolling

UrbanRural

Highway Capacity LimitsHighway Capacity Limits

ClimateClimate

Runtime ImprovementsRuntime Improvements

Proj Nam

e

Description MEPDG-v1.1 Runtime

DarwinME Runtime

Overall *

Overall

Following runtime is measured on a laptop of 32bit XP, 3 GHz, 3.5 GB RAM

121

New HMA:8” AC , Binder 10%, Air voids 8.5%, Granular base.

13’45” 12’21” 5’11”

Following runtime is measured on a laptop of 32bit XP, 3 GHz, 1.0 GB RAM

121

New HMA:8” AC , Binder 10%, Air voids 8.5%, Granular base.

32’28” 30’00” 11’37”Overall* - time measure does not include Summary process for Excel report generation

PC comparisons – PRELIMINARY RESULTS

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

License Fees for FY2011License Fees for FY2011Individual 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

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.

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

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

50 Year Life Cycle Cost factor

> 10 PERCENT USE LESS COSTLY

< 10 PERCENT ALTERNATE BID

SPECIAL CASE Settlement Areas Presence of Distillates

Contract Bid plus Factor

Initial Costs – Contractor’s Bid LCCA (50 years) Present Value

HMA Strategy PCCP Strategy

RECENT CONTRACT FACTORS

HMA - $2,353,504.28

PCCP - $1,480,742.91

WINNING BID

HMA ($) PCCP ($)

BID 22,154,963.32

22,290,308.03

FACTOR 2,353,504.28 1,480,742.91

LOWEST BID + FACTOR

24,508,467.60

23,771,050.94

SUGGESTIONS / CONSTRUCTIVE COMPLAINTS

Call me at 317-232-5452