Introduction to PAVEXpress – Pavement Design · 2018. 12. 12. · AASHTO Suggested Reliability Levels For Various Functional Classifications Reliability Level (R): 50% to 95%, depending

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

[email protected]

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.

www.PaveXpressDesign.com 4

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


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


www.PAVEXpressDesign.com 7


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


1)Method of

Determining ESALS

by Average Annual

Daily Traffic


Screen 3


1)Method of

Determining

ESALS

by Average Annual

Daily Traffic

Screen 3


Annual ESALs

Screen 3


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.


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.



Other Capabilities

Layered Elastic AnalysisParking Lot Design Guidance

Life Cycle Cost Analysis


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Source Materials and References• PaveXpress’s LCCA model is based on research embedded in…

NEW: Porous Pavement Design



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


A Pavement Design Instructional Toolwww.PAVEInstruct.com

PAVEInstruct Modules• Overview

• New Flex and Rigid Pavement Designs

• Overlays

• MEPDG

• Perpetual Pavements

• PerRoad

• Porous Design

• LCCA


Click

Here

AMERICA RIDES ON US

www.PaveXpressDesign.com

28

Thank you!

Dan - [email protected]

www.PAVEinstruct.com

www.PAVExpressDesign.com

mailto:[email protected]

Barrett-PaveXpressStaebell-PaveXpress

Documents

Introduction to PAVEXpress – Pavement Design · 2018. 12. 12. · AASHTO Suggested Reliability Levels For Various Functional Classifications Reliability Level (R): 50% to 95%, depending