Introduction to PAVEXpress –
Pavement DesignDecember 6, 2018
Project Locations
KDOT Design vs. PAVEXpress Background
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
4,000,000
4,500,000
K-27 US-169
Flexible Design ESAL’s
0
1,000
2,000
3,000
4,000
5,000
6,000
K-27 US-169
Design Resilient Modulus (MR) Soil
KDOT Design vs. PAVEXpress – K-27 Wallace
KDOT Design – K-27 Wallace PAVEXpress Design – K-27 Wallace
KDOT Design vs. PAVEXpress – US-169 Allen
KDOT Design – US-169 Allen PAVEXpress Design – US-169 Allen
Conclusions
• PAVEXpress appears to run an approximation of AASHTO ‘93
• Good software for concept design or ballpark costs for a project
• Not customizable to every situation
AMERICA RIDES ON US
62ND ANNUAL ASPHALT
PAVING CONFERENCE
www.PAVEXpressDesign.com
December 6th 2018
Dan Staebell
APA
Regional Director
Market Research &Communications
Research &
TechnologyDeployment
Activities
• Asphalt Institute
• NCAT
Other Research
Future Research
Deployment
Task GroupGo-To-Market
Task Group
Pavement Economics
Committee• Six Task Groups
An Easy-to-Use Pavement Design Toolwww.PAVEXpressDesign.com
A Pavement Design Instructional Toolwww.PAVEInstruct.com
PaveXpress
Brief
Overview
AASHTO has been
developing MEPDG for high
volume roads, but a gap has
developed for local roads
and lower volume roads.
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What Is PaveXpress?A free, online tool to help you create simplified pavement designs
using key engineering inputs, based on the AASHTO 1993 and 1998
supplement pavement design process.
• Accessible via the web and mobile devices
• Free — no cost to use
• Based on AASHTO pavement design equations
• User-friendly
• Share, save, and print project designs
• Interactive help and resource links
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What Does PaveXpress Do?
• New pavement designs – asphalt, porous asphalt and concrete
• Asphalt overlay designs
• Initial cost estimates
• Life cycle cost analysis
• Mechanistic pavement analysis
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Click
Here
AASHTO Suggested Reliability Levels
For Various Functional ClassificationsReliability Level (R): 50% to 95%, depending on Roadway Classification
The probability that a pavement section designed using the process will perform satisfactorily over the traffic
and environmental conditions for the design period. This is then used to look up ZR, the standard normal
deviate which is the standard normal table value corresponding to a desired probability of exceedance level.
Suggested levels of reliability for various Functional Classifications (1993 AASHTO Guide, Table 2.2, page II-9):
Functional ClassificationRecommended Level of Reliability
Urban Rural
Interstate and Other Freeways 85–99.9 80–99.9
Principal Arterials 80–99 75–95
Collectors 80–95 75–95
Local 50–80 50–80
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1)Method of
Determining ESALS
by Average Annual
Daily Traffic
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Screen 3
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1)Method of
Determining
ESALS
by Average Annual
Daily Traffic
Screen 3
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Annual ESALs
Screen 3
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SN
Value
Layer Coefficient ConsiderationsAverage values of layer coefficients for materials
used in the AASHO Road Test were as follows:
Asphalt Surface Course 0.44
Crushed Stone Base Course 0.14
Sandy Gravel Subbase 0.11
Keep in mind that these values were empirically
derived from a road test with one climate, one
soil type, and one asphalt mix type.
The asphalt layer coefficient used for the Road
Test was actually a weighted average of values
ranging from 0.33 to 0.83.
More recent studies at the NCAT Test Track found that
for Alabama, an asphalt layer coefficient of 0.54
better reflected actual performance.
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Recommendation:
Perform multiple iterations of the design with
different plausible input values to get a sense
of the range of pavement structures needed to
carry the anticipated loads in various
scenarios.
Use engineering judgment to select the
optimum pavement structure.
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Other Capabilities
Layered Elastic AnalysisParking Lot Design Guidance
Life Cycle Cost Analysis
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AMERICA RIDES ON US
Source Materials and References• PaveXpress’s LCCA model is based on research embedded in…
NEW: Porous Pavement Design
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Rigid PavementsPaveXpress can also be used to design rigid
pavements in accordance with the AASHTO
Design Guide 1998 Supplement for Rigid
Pavements.
The steps are similar, but
geared toward the values and
inputs important to concrete
pavements.
Third Party Verified
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A Pavement Design Instructional Toolwww.PAVEInstruct.com
PAVEInstruct Modules• Overview
• New Flex and Rigid Pavement Designs
• Overlays
• MEPDG
• Perpetual Pavements
• PerRoad
• Porous Design
• LCCA
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Click
Here
AMERICA RIDES ON US
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Thank you!
Dan - [email protected]
www.PAVEinstruct.com
www.PAVExpressDesign.com
mailto:[email protected]
Barrett-PaveXpressStaebell-PaveXpress