Introduction to PAVEXpress Pavement Design December 6, 2018
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KDOT Design vs. PAVEXpress Background Flexible Design ESAL s Design Resilient Modulus (M R ) Soil 4,500,000 6,000 4,000,000 3,500,000 5,000 3,000,000 4,000 2,500,000 2,000,000 3,000 1,500,000 2,000 1,000,000 500,000 1,000 0 K-27 US-169 0 K-27 US-169
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
62ND ANNUAL ASPHALT PAVING CONFERENCE December 6 th 2018 Dan Staebell APA Regional Director dstaebell@asphaltroads.org AMERICA RIDES ON US www.pavexpressdesign.com
Research & Technology Pavement Economics Committee Six Task Groups Other Research Asphalt Institute NCAT Future Research Market Research & Communications Go-To-Market Task Group Deployment Activities Deployment Task Group
PaveXpress Brief An Easy-to-Use Pavement Design Tool www.pavexpressdesign.com Overview A Pavement Design Instructional Tool www.paveinstruct.com
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 www.pavexpressdesign.com 5
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 6
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AASHTO Suggested Reliability Levels For Various Functional Classifications Reliability 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 Z R, 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 Classification Recommended 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 www.pavexpressdesign.com 10
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Screen 3 1)Method of Determining ESALS by Average Annual Daily Traffic www.pavexpressdesign.com 12
Screen 3 1)Method of Determining ESALS by Average Annual Daily Traffic www.pavexpressdesign.com 13
Screen 3 Annual ESALs www.pavexpressdesign.com 14
SN Value www.pavexpressdesign.com 15
Layer Coefficient Considerations Average 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. www.pavexpressdesign.com 16
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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. www.pavexpressdesign.com 19
Other Capabilities Layered Elastic Analysis Parking Lot Design Guidance www.pavexpressdesign.com 20
Life Cycle Cost Analysis www.pavexpressdesign.com 21
Source Materials and References PaveXpress s LCCA model is based on research embedded in AMERICA RIDES ON US
NEW: Porous Pavement Design www.pavexpressdesign.com 23
Rigid Pavements PaveXpress 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. www.pavexpressdesign.com 24
Third Party Verified www.pavexpressdesign.com 25
A Pavement Design Instructional Tool www.paveinstruct.com
Overview New Flex and Rigid Pavement Designs Overlays MEPDG Perpetual Pavements PerRoad Porous Design LCCA PAVEInstruct Modules Click Here www.pavexpressdesign.com 27
Thank you! Dan - dstaebell@asphaltroads.org www.pavexpressdesign.com www.paveinstruct.com www.pavexpressdesign.com AMERICA RIDES ON US 28