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AASHTOWare: Pavement ME Design
FY15 Enhancements
Enhancements to
AASHTOWare
Pavement ME®
Design:
Version 2.2
AASHTOWare: Pavement ME Design
FY15 Enhancements
Moderators:
Presenters:
• Judith Corley-Lay; NCDOT and
Chairperson, AASHTOWare
ME Design Task Force
• Vicki Schofield, AASHTO
• Harold L. Von Quintus, P.E.,
ARA
• Michael I. Darter, P.E., ARA
Presentation will be available for viewing on the ME-Design
Resource website:
http://www.me-design.com
AASHTOWare: Pavement ME Design
FY15 Enhancements
Task Force Members:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Judith Corley-Lay; NCDOT, Chairperson
Vicki Schofield, AASHTO Project Manager
John Donahue, Missouri DOT
William Barstis, Mississippi DOT
Jay Goldbaum, Colorado DOT
Marta Juhasz, Alberta Transportation
Mehdi Parvini, California DOT
Felix Doucet, TAC Liaison
Gary Crawford/Tom Yu, FHWA Liaison
AASHTOWare: Pavement ME Design
FY15 Enhancements
Announcements:
1. 2nd Edition of the MEPDG Manual of Practice is now available
through the AASHTO Bookstore.
2. Webinars are planned for software releases that include
enhancements which impact the predicted distresses.
3. AASHTO is performing a Technical Audit of the software in
FY16, which is schedule for completion in February 2016.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Process for Revising the Software:
1. Suggested revisions are received from users and AASHTO
members.
2. ME Design Task Force monitors on-going/completed NCHRP,
FHWA, and pool fund projects applicable to the MEPDG.
3. ME Design Task Force members review and prioritize all
potential suggested revisions and enhancements.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Topics:
1. Enhancements
 What is the enhancement?
• Explained through addendum
 How to access/use the
enhancement?
 What is the impact on the predicted
distress?
2. Uploading Old Project Files
3. Questions and Answers
AASHTOWare: Pavement ME Design
FY15 Enhancements
Addendum are available through
the ME-Design Resource Website
for downloading the software:
http:www.me-design.com
AASHTOWare: Pavement ME Design
FY15 Enhancements
Topics:
1. Enhancements:
a) AC Layer Dependent Plastic Deformation
Coefficients
b) New PCC Calibration Coefficients
c) New Normalized Axle Load Spectra Defaults
d) Rehabilitation Input Levels 1 & 2 for PCC Overlay
of Flexible Pavements
e) Reflection Cracking Transfer Functions
2. Uploading Old Project Files
3. Questions and Answers
AASHTOWare: Pavement ME Design
FY15 Enhancements
Enhancement:
AC Layer Dependent
Plastic Deformation
Coefficients
• Enhancement added in FY2014 and
included in software release 2.1
• NCHRP Project 9-30A; Report #719
• Addendum #FY15.2
AASHTOWare: Pavement ME Design
FY15 Enhancements
AC Layer Dependent Plastic Deformation
Coefficients
Version 1.1 and earlier versions:
 One set of plastic deformation coefficients assumed for all AC
layers, regardless of the properties.
Version 2.1 enhancement:
 Plastic deformation coefficients can be entered for each AC
layer (new and existing AC layers).
AASHTOWare: Pavement ME Design
FY15 Enhancements
AC Layer Dependent Plastic Deformation
Coefficients
AC Layer
Properties
AASHTOWare: Pavement ME Design
FY15 Enhancements
AC Layer Dependent Plastic
Deformation Coefficients
AASHTOWare: Pavement ME Design
FY15 Enhancements
AC Layer Dependent Plastic Deformation
Coefficients
Project
Calibration
Coefficients
AASHTOWare: Pavement ME Design
FY15 Enhancements
Addendum
#FY15.2:
Determining
the plastic
deformation
coefficients
Plastic Deformation Coefficients
AASHTOWare: Pavement ME Design
FY15 Enhancements
AC Layer Dependent
Plastic Deformation
Coefficients
Coefficient
Global
Kr1
Mixture
Layer 1
Layer 2
-3.35
-2.25
-1.95
Kr2
1.5605
1.5605
1.5605
Kr3
0.4791
0.30
0.30
Layer dependent plastic
deformation coefficients:
Minimal to moderate
impact on rutting.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Enhancement:
New LTPP Normalized
Axle Load Spectra
Defaults
• LTPP/FHWA Pool Fund Study
• Olga Selezneva, Principal Investigator
• Addendum #FY15.1
AASHTOWare: Pavement ME Design
FY15 Enhancements
New LTPP NALS Defaults
Version 2.1 and earlier versions:
 One set of default NALS was included in software; developed
from NCHRP Project 1-37A.
 NCHRP 1-37A default NALS represents overall average from
WIM sites in all functional classes; questions were raised about
its accuracy.
Version 2.2 enhancement:
 LTPP defined WIM sites as their “gold standard;” primarily
interstate WIM sites used to generate LTPP default NALS.
 4 NALS added as default NALS in the software.
AASHTOWare: Pavement ME Design
FY15 Enhancements
New LTPP NALS Defaults
How to
retrieve the
additional
LTPP NALS?
LTPP NALS included
under “Traffic” tab.
AASHTOWare: Pavement ME Design
FY15 Enhancements
New LTPP NALS Defaults
Addendum #FY15.1
Four LTPP NALS:
1.Global 3. Typical
2.Heavy 4. Light
AASHTOWare: Pavement ME Design
FY15 Enhancements
New LTPP NALS Defaults
How
different
are the
additional
NALS?
Minor difference between
typical and global LTPP
NALS.
AASHTOWare: Pavement ME Design
FY15 Enhancements
New LTPP NALS Defaults
NCHRP 1-37A
LTPP Global
LTPP Heavy
Biggest difference
is for cracking.
LTPP Typical
LTPP Light
What difference do the new NALS make in the flexible
pavement distress predictions?
AASHTOWare: Pavement ME Design
FY15 Enhancements
New LTPP NALS Defaults
NCHRP 1-37A
LTPP Global
LTPP Heavy
Biggest difference
is for cracking.
LTPP Typical
LTPP Light
What difference do the new NALS make in the rigid
pavement distress predictions?
AASHTOWare: Pavement ME Design
FY15 Enhancements
New LTPP NALS Defaults
NCHRP 1-37A default NALS and LTPP Heavy NALS result
in about the same predicted distress.
Other LTPP NALS result in less distress.
AASHTOWare: Pavement ME Design
FY15 Enhancements
New LTPP NALS Defaults
Use of global NALS or agency local NALS:
No impact on predicted distress.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Poll Questions #1, #2, and #3.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Enhancement:
New PCC Calibration
Coefficients
• NCHRP 20-24, Task 325
• Dr. Julie Vandenbossche, Principal
Investigator
• Addendum #FY15.3
AASHTOWare: Pavement ME Design
FY15 Enhancements
New PCC Calibration Coefficients
Version 2.1 and earlier versions:
 JPCP & CRCP calibration coefficients and standard deviation
equations were based on results from CTE test method that
was found to be in error (over prediction of CTE about 0.8).
 CTE method was revised and corrected (AASTHO 336).
 NCHRP 20-24, Task 325 evaluated and recommended a revised
set of calibration coefficients and standard deviation equations
using the revised (correct) CTE test method.
AASHTOWare: Pavement ME Design
FY15 Enhancements
New PCC Calibration Coefficients
Version 2.2 enhancement:
 New JPCP & CRCP global calibration coefficients and
standard deviation equations from Task 325
replaced the older set of values.
 Now, a designer must enter the “correct” CTE values
and use the new global calibration coefficients and
standard deviations.
AASHTOWare: Pavement ME Design
FY15 Enhancements
New PCC Calibration Coefficients
Version 2.2 enhancement:
 States that have locally calibrated using the
“correct” CTE values should continue to use these
local calibration coefficients and standard deviations
(e.g., Arizona, Colorado, Georgia, Mississippi, Utah,
Wyoming, etc.) and inputting the “correct” CTE
values.
AASHTOWare: Pavement ME Design
FY15 Enhancements
New JPCP Calibration Coefficients
 NCHRP 20-24, Task 325
 Addendum #FY15.3
AASHTOWare: Pavement ME Design
FY15 Enhancements
New CRCP Calibration Coefficients
NCHRP 20-24, Task 325
Addendum #FY15.3
AASHTOWare: Pavement ME Design
FY15 Enhancements
Impact of New Global Calibration
• Version 2.2 new global calibration for JPCP and
CRCP should not result in significantly different
designs on average since the same field sections
with the same performance trends were used.
• Of course, some designs will be a little thicker
and some thinner due to variations involved.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Enhancement:
Rehabilitation Input
Levels 1 & 2 for PCC
Overlays of Flexible
Pavements
AASHTOWare: Pavement ME Design
FY15 Enhancements
Rehabilitation Input Levels 1 & 2 for PCC
Overlays of Flexible Pavements
Version 2.1 and earlier versions:
 Only rehabilitation input level 3 could be used for PCC overlays
of flexible pavements, while rehabilitation input levels 1, 2, & 3
were used for AC overlays.
Version 2.2 enhancement:
 Rehabilitation input levels 1, 2, and 3 are applicable for both
PCC and AC overlays of flexible pavements.
 Level 1: Backcalculate HMA “Damaged” Modulus
 Level 2: Enter % Alligator Cracking (not patched)
 Level 3: Enter Ratting: “Good”, “Fair”, etc.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Rehabilitation Input Levels 1 & 2 for PCC Overlays
AC Layer
Properties
AASHTOWare: Pavement ME Design
FY15 Enhancements
Rehabilitation Input Levels 1 & 2 for PCC Overlays
No addendum for this enhancement, because rehab
input levels 1 and 2 are the same as for AC pavements.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Rehabilitation Input Level 1 for PCC Overlays
Rehabilitation
Input Level 1:
HMA Modulus
from
backcalculation
in cracked
areas
AASHTOWare: Pavement ME Design
FY15 Enhancements
Rehabilitation Input Levels 1 & 2 for PCC Overlays
Use of rehab. input levels 1 & 2, in comparison to level 3 :
No impact on bias of predicted PCC distress.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Enhancement:
Reflection Cracking
Transfer Function from
NCHRP 1-41
• NCHRP Project 1-41
• Dr. Robert L. Lytton, Principal Investigator
• Addendum #FY15.4
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Transfer Function from
NCHRP Project 1-41
Version 2.1 and earlier versions:
 Prediction of reflection cracks was based on an empirical
regression equation and only applicable to load-related cracks.
Version 2.2 enhancement:
 Integrated the ME based fracture mechanics model in the
software for predicting reflection cracks.
 Applicable to load and non-load related cracks of flexible, semirigid, intact PCC, and fractured PCC pavements.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Integration
Based on results and methodology developed from
NCHRP Project 1-41
A special thank you to:
 Bob Lytton and Sheng Hu (Texas Transportation Institute)
provided a lot of information and explanation on the
models/equations.
 Halil Ceylan completed the neural networks; the final
product was not possible without Halil’s effort and
assistance.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Integration
Documents:
 Addendum #FY15.4
 Enhancement has a large impact on the total predicted cracking
for AC overlays and existing AC pavements.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking
Integration
Expanded Pavement Design
Types:
i.
Overlay Design with Seal
Coats
ii. Overlay Design with
Interlayers
iii. Overlay of Semi-Rigid
Pavements
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Integration
Performance Criteria:
 AC overlay of
AC pavement
 AC overlay &
seal coat of AC
pavement
 AC overlay &
interlayer of
AC pavement
AC overlay of AC
pavement
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Integration
Performance Criteria:
AC overlay of Intact JPCP
AC overlay of Fractured JPCP
AC overlay of CRCP
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Integration
Performance Criteria:
Semi-rigid
pavement
AC overlay of
semi-rigid
pavement
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Integration
Software now considers fatigue and transverse cracks
separately.
AC over Semi-Rigid
AC over AC
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Integration
AC over Fractured JPCP
Software now
considers crack spacing
in fractured slab and
load transfer efficiency
of cracks.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection
Cracking
Integration
Semi-Rigid
Pavements:
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking
Integration
Sensitivity of load transfer
efficiency or crack severity:
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking
Integration
 Example, Overlay of
Flexible Pavement
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking
Integration
 Example, Overlays of
Intact and Fractured
JPCP
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking
Integration
 Example, New SemiRigid Pavement
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Integration
Calibration Coefficients, AC over
Flexible Pavements:
Fatigue
Cracks
Transverse
Cracks
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Integration
Calibration Coefficients, AC
over JPCP:
Transverse
Cracks
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Integration
Calibration Coefficients, AC over
Fractured JPCP/CRCP:
Transverse
Cracks
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Integration
Calibration
Coefficients, AC over
Semi-Rigid Pavements:
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking Integration
Calibration Coefficients,
Semi-Rigid Pavements:
AASHTOWare: Pavement ME Design
FY15 Enhancements
Reflection Cracking
Integration
Observation from
calibration sites:
 Seal coats and interlayers do
not result in significant
difference in reflection
cracking from AC over AC.
Important to verify
predictions using agency
specific data.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Topics:
1. Enhancements:
2. Uploading Old Project Files
3. Questions and Answers
AASHTOWare: Pavement ME Design
FY15 Enhancements
Uploading Old Project Files
When opening an old project file for:
 New design, there should be no differences.
 Rehabilitation, difference will be with:
 Amount of fatigue and transverse cracks in the existing
pavement.
 Load transfer efficiency of cracks in the existing layer.
 Calibration factors.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Uploading Old Project Files
• Open an old project in ME Design
• Click the “+” sign next to “ME Design
Calibration Factors” node
• For AC overlay projects, double click
“Rehabilitation Flexible” node
• For New AC projects, double click “New
Flexible” node
AASHTOWare: Pavement ME Design
FY15 Enhancements
Uploading Old Project Files
Click “Update Open
Projects” tab at the
bottom of the window
AASHTOWare: Pavement ME Design
FY15 Enhancements
Poll Questions #4 and #5.
AASHTOWare: Pavement ME Design
FY15 Enhancements
QUESTION AND
ANSWER SESSION
We welcome comments &
suggestions for future webinars.
AASHTOWare: Pavement ME Design
FY15 Enhancements
Thank you for Attending the Webinar!
AASHTOWare Pavement MEDesign Contacts:
Help Desk, Customer Support:
ARA Staff:
• Vicki Schofield, AASHTO
vschofield@aashto.org
Phone: (202) 624-3640
• Judith Corley-Lay, NCDOT
jlay@ncdot.gov
•
ME Design Resource Website
http://www.me-design.com
Other ARA Staff:
• Chad Becker
cbecker@ara.com
• Harold Von Quintus, P.E.
hvonquintus@ara.com
• Michael I. Darter, P.E.
Mdarter@ara.com
•
Deepak Raghunathan, ARA Inc.
draghunathan@ara.com
Phone: (217) 356-4500
Biplab Bhattacharya, P.E.
bbhattacharya@ara.com