Driving Indiana s Economic Growth 2011 PURDUE ROAD SCHOOL

Driving Indiana’s Economic Growth 2011 PURDUE ROAD SCHOOL PAVEMENT DESIGN PROCESS David Andrewski, PE

PAVEMENT DESIGN In times of change, the learners inherit the earth while the learned find themselves beautifully equipped for a world that no longer exists.

PAVEMENT DESIGN PCCP HMA SUBBASE INCHES ASPHALT INCHES CONCRETE

PAVEMENT DESIGN A determination of an economical structure for the riding surface of a roadway taking into account traffic, environment, and material properties of the pavement and foundation materials.

Traffic n Loading n Structure n n Load Spectra Abrasion n Polishing Effect of Tires

Environment n Temperature n n Hot / Cold Angle of the sun Thermal Absorptivity Moisture n n Precipitation Water Table

Materials n Stabilized n n Unbound n n HMA and PCCP Granular and Soil Fills Foundation n n Treated and Insittu Condition

HOW ?

MEPDG

MEPDG (Analysis Tool) n n n Predicts Stresses and Strains Models Pavement Distresses Compares Distresses to Allowable Calculates Reliability Pass / Fail

PAVEMENT DESIGN RESULTS Thinner HMA Thinner PCCP RISK ! Pay Attention to the Subgrade

BUT WAIT IT’s NOT THAT EASY!

MEPDG (Trial & Error) n DARWin-ME 1. 0 Research Software n Run Time (one trial) n n HMA 20 to 90 minutes PCCP 15 to 30 minutes Reliability Final Design n n Typically 2 to 5 runs Thinnest not Exceeding Distresses

Background n DARWin-ME supports AASHTO’s Mechanistic Empirical Pavement Design Guide published in 2008 n n Work product of NCHRP projects 1 -37 A and 1 -40 D Nearly a decade of development Base software: Freeware, available through the Transportation Research Board DARWin-ME covers 17 pavement design situations n New concrete and asphalt pavements and various types of asphalt and concrete overlays

DARWin-ME Inputs/Outputs System Inputs n n n n System Outputs Project information n Design information n Materials & structure data n Traffic data n Climate data Rehabilitation information n Initialization data Input summary Climate summary Design pass/fail checks Material properties summary Pavement distress summary/charts

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

DARWin-ME Planned Improvements n Efficiency n n n Functionality n n n Increase software speed Automated thickness optimization Batch mode Sensitivity SI version Traffic caps Stability n n Correct reported bugs (Task Force directed) Improve error handling

DARWin-ME Task Force n n n n n 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 Status n n n Project solicitation issued in July 2008 Received commitments from 20 member agencies and the FHWA. Sole Source Contract to ARA n n n 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

Opening Screen GENERAL INFO ANALYSIS PARAMETERS EXPLORE R WINDOW PAVEMEN T STRUCTU RE LAYER PROPERTIES ERROR LIST RUN PROGRES S

DARWin-ME Toolbar

Project Creation

Pavement Structure Layers can be added/removed using visual aid n Layer labels editable n Layer represented graphically n Layering check to disallow illegal entries n

Material Properties – AC

Material Properties – PCC

Material Properties – Non-Stabilized Materials & Subgrade

Material Properties – Stabilized Layer

Traffic TRAFFI C INPUTS HIGHWAY CAPACITY VEHICLE CLASS MONTHLY ADJUSTMENT AXLES PER TRUCK HOURLY ADJUSTMEN T

Highway Capacity Limits ØFreeway ØMultilane highway Ø 2 -lane highway ØLevel ØRolling ØUrban ØRural

Highway Capacity Limits

Climate

Runtime Improvements UR 01 – Asphalt pavement type analysis shall be improved to be completed within 15 minutes PC comparisons – PRELIMINARY RESULTS Proj Name Description MEPDG-v 1. 1 Runtime Overall * Darwin. ME Runtime Overall Following runtime is measured on a laptop of 32 bit 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 32 bit 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

License Fees for FY 2011 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. 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 1 36

Project Pavement Design n INDOT n n n LPA n n District Central Office Consultant Submitted To n Mary Maddox

Chapter 52 n Structural Properties n n MEPDG DARWin-ME (April 2011) Economics (LCCA) Functional Properties n Standard Specifications n n n Surface Friction Acceptance Drainage

Existing Pavements n Distress Identification n n Cracking Rutting Spalling Joints Friction

Final Design n INDOT Project n n Approval LPA Project n Review for Compliance with Chapter 52

THANK YOU