Download - Pavement Design Using MEPDG DARWin-ME
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Pavement Design Using MEPDG DARWin-ME
Jay Goldbaum, P.E., Colorado DOT
39th AnnualRocky Mountain Asphalt Conference
and Equipment ShowFebruary 24th, 2012
Thursday, April 19, 2012
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Overview
Why use the Mechanistic Empirical Pavement Design Guide (MEPDG)?
Goal of DARWin-ME Features
– Climate– Traffic Data– Material Properties
Software Comparison Example Conclusions
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Why Mechanistic Empirical ?
Based on fundamental engineering principles Climate linked to design and materials Enhanced definition of material properties
– Ability to relate material properties to performance Improved traffic characterization Excellent pavement forensic tool Modular system that allows for incremental
enhancement Ability to design and calibrate for local
conditions- Relates to all ME Procedures -
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Fundamental Engineering
Climate Inputs
EICM
Material Properties
Transfer Functions
Predicted Performance Mechanistic Analysis
Traffic
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Comparison between the old and the new
Factors 1993 AASHTO
MEPDGDARWin-ME
Simple/Less Costly
Diversity of Conditions
Colorado Calibration; Roadway Segments
Accuracy of Method
Climatic Effects
Material Properties - Site
Time Effects on Properties
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DARWin-ME Goal:
Provide the transportation community with a production level, state-of-the-art software tool for the analysis of new and rehabilitated pavement structures consistent with AASHTO’s Mechanistic Empirical Pavement Design Guide.
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“The MEPDG is an analysis tool, not a pavement design program.”
– Various Unnamed Sources
DARWin-ME
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Climate Data
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Climate Data
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Climate Data – More Intuitive
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Traffic Data
Continuous Length ClassificationContinuous Axle Classification
Weigh-in-Motion Station
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Class 9 TrucksClass 5 Trucks
18k ESAL’s
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Class 9 TrucksClass 5 Trucks
Axle Load Spectra
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Traffic Data
WIM Data
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Traffic Data
6-14
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Traffic Data – Ability to Import from XML Database
MEPDG User
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Loads and Layer Stiffness
E*
Mr
Mr
σ
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Loads and Layer Stiffness
Mechanistic AnalysisLayered Elastic Analysis
E*
Mr
Mr
σ
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Loads and Layer Stiffness
Mechanistic AnalysisLayered Elastic Analysis
E*
Mr
Mr
σ
Strain Calculations at Critical Locations
E = σ/ε
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6-17
0
750,000
1,500,000
2,250,000
3,000,000
0 6 12 18 24 30 36 42 48 54 60
Mod
ulus
(psi
)
Pavement Age (month)
SMA
Grading SX
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Material PropertyInput LevelInput LevelInput Level
Material Property1 2 3
HMA Dynamic Modulus - -HMA Repeated Load Permanent Deformation
HMA Indirect Tensile Creep Compliance -HMA Indirect Tensile Strength -HMA Maximum Specific Gravity
Bulk Specific Gravity of Cores
HMA Mixture Design Sheets -
Asphalt Specific Gravity
Asphalt Content of HMA Mixture
Asphalt Performance Grade
Asphalt Penetration @ 25 °C - -Asphalt Viscosity @ 140 °C - -Asphalt Viscosity @ 275 °C - -Asphalt Viscosity - -Asphalt Softening Point - -Fine aggregate specific gravity & absorption
Coarse aggregate specific gravity & absorption
Sieve analysis of fine & coarse aggregate -
HMA Material Properties Required for DARWin-ME
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6-19
M-E Guide Outputs: Flexible
Fatigue Cracking
Thermal Cracking
IRIRut Depth
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User Friendly Software
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User Friendly Software
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Climate and Materials
Time, years
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Climate and Materials
Time, years
AC Modulus
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Climate and Materials
Time, years
Subgrade Modulus
AC Modulus
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Climate and Materials
Time, years
Traffic
Subgrade Modulus
AC Modulus
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Climate and Materials
Time, years
Each load application
Traffic
Subgrade Modulus
AC Modulus
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First Impressions
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Communicative between Screens
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Instinctive Operations
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Itemized Data Export Capability
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Run-Time Performance
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Open and analyze more than one project
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Exploring Sensitivity
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Comparison of CDOT and DARWin-ME new HMA design
Factor CDOT DARWin-MEDesign ESALs 18 million 18 millionReliability 95% 95%Subgrade R-value (MR)
9 (3448 psi) 9 (6098 psi)Aggregate Base Thickness
24-in 24-in
Aggregate Base MR
31,826 psi(Struc. Coefficient = 0.12)
21,500 psi
HMA Thickness
9-in 9-in** Passed all criteria except for rutting
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DARWin-ME is coming to a computer near youSummer 2012
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Conclusions
Very intuitive, a real pavement analysis tool
Run faster and multiple projects Use your imagination to consider
pavements
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Thank you
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