North dakota becomes familiar with the mepdg documentation and software and. Peter stephanos director, office of material technology. Researchers are now incorporating the latest advances in pavement design into the new mechanisticempirical pavement design guide mepdg, developed under the national cooperative highway research. The development of the mechanisticempirical pavement design guide mepdg under national cooperative highway research program nchrp projects 7a and 140d has significantly improved the ability of pavement designers to model and simulate the effects of traffic and climate on future pavement damage, distress, and smoothness. Memorandum from aashto containing project scope and information. Accuracy of mepdg dynamic modulus predictions for short. Trends of pavement performance with reliability level were similar for both methodologies. It is strongly encouraged this memo is read prior to downloading or viewing mechanisticempirical design guide files andor. The mechanistic empirical pavement design guide mepdg developed under the nchrp 7a initiative is a significant advancement in pavement design. The development of the mechanisticempirical pavement design guide mepdg under national. Table 5 can either be included as a popup screen in the 2002 design guide software or simply presented in the users manual for the software, as. Comparison of mechanisticempirical and empirical flexible pavement design procedures of aashto. By comparing the dynamic modulus predictions obtained using the mepdg to e measurements obtained in the laboratory for shortterm and longterm aged hma and foamed wma mixtures, it was observed that the nchrp 1 37a model generally underestimated the dynamic modulus of the hma mixtures r 2 close to 0. Aashtoware pavement me software where does vdot use mepdg.
Introduction to mepdg flexible pavement design 3 pdhs. Performance of mepdg dynamic modulus predictive models for. Characterization of subgrade resilient modulus for virginia soils and its correlation with the results of other soil tests. The design guide software outputs on a monthly basis the cumulated number of heavy trucks in the design lane as an overall indicator of the magnitude of truck. In 2004, the guide for the mechanisticempirical design of new and rehabilitated pavement structures mepdg was developed under nchrp project 1 37a to replace the currently used 1993 guide for design of pavement structures by the american association of state highway. This guide incorporates latest pavement knowledge and experiences, which were developed during the last 50 years. Local calibration of the mepdg for flexible pavement design.
Implementation of the nchrp 1 37a design guide final report volume 2. It is noted that a nchrp project 140b is expected to produce a mepdg user manual and local calibration guide by spring of 2007. Development of a flexible pavement database for local calibration of mepdg 1 development of flexible pavement database for local calibration of mepdg. Investigation of aashtoware pavement me designdarwinme.
A mechanisticempirical pavement design guide mepdg has been developed in the usa under the nchrp 1 37a in 2004 to address shortcomings in the current pavement design methods. Interstate and primary routes new, reconstruction, and lane widening. Characterization of subgrade resilient modulus for. Design guide mepdg under national cooperative highway research program nchrp projects 7a and 140d has significantly improved the ability of. Itd, aashto, and mepdg pavement design methods a comparison. First, the fatigue cracking prediction model included in the mepdg was never calibrated under nchrp projects 1 37a or 1 40d. The mepdg has been very useful for those situations. The mechanisticempirical pavement design guide, related documentation, and the latest version of its software are available online for evaluation through 30 september 2011. It replaces the empirical 1993 aashto design guide hossain 2009.
Calibrating the mepdg software to local site conditions and materials is. This distribution of the mepdg developed in nchrp project 7a is made in the. Full text of mechanisticempirical pavement design guide. Mepdg pavement design guide 1516 november 2011 arizona state university tempe, arizona dr. This guide incorporates pavement knowledge and experiences, which were developed during the last 50 years. Highway research program nchrp projects 7a and 140 and easily qualifies. Guidelines for implementing nchrp 7a me design procedures. The help document provided with the software provides more information on using the software and describing some inputs 2. New england verification of national cooperative highway. But some of our traffic is getting heavier, especially around the interstates, and were realizing that we need to use thicker slabs in those locations. This project identified a number of problems which were necessary to solve. The mechanisticempirical pavement design guide mepdg is the research version of the newly released darwinme software by aashto. This paper presents a new method for the local calibration of the rutting models in the mechanisticempirical pavement design guide mepdg for indianas pavements using accelerated pavement testing apt.
Following the direction of our parent organization the national academy of sciences, engineering, and medicine, the majority of our staff are working from home, until at least may 1. The significance of this material property is threefold. Implementing mechanistic empirical pavement design and. Calibration of rutting models for structural and mix design highlights proposed revisions to the mechanisticempirical pavement design guide mepdg and software to incorporate three alternative rutdepth prediction models that rely on repeated load triaxial permanent deformation or constant height testing to. Mepdg national implementation efforts south east pavement preservation may 12, 2009. To improve the design and performance of roadway pavements, ara, in collaboration with our industry and university teaming partners, developed the mechanisticempirical pavement design guide mepdg methodology and software as part of national cooperative highway research program nchrp project 7a. Ce 755 highway pavement design engineering online nc. New england verification of national cooperative highway research program nchrp 1 37a mechanisticempirical pavement design guide. Development of flexible pavement database for local. An overview of the new aashto mepdg pavement design. Additionally, nchrp project 140j provide support for the lead. The overall objective of the guide for the mechanisticempirical design of new and rehabilitated pavement structures referred to hereinafter as the design guide is to provide the highway community with a stateofthepractice tool for the design of new and rehabilitated pavement structures, based on mechanisticempirical principles.
The mepdg employs mechanisticempirical approaches that promote accurate characterization of pavement structures and provide uniform guidelines for designing new and rehabilitated flexible. This objective was accomplished through developing the. Comparison of mechanisticempirical and empirical flexible. More detailed information on pavement me is available through the aashto document titled mepdg. In the design guide, a predictive rutting system was developed to evaluate the permanent deformation within all rut susceptible layers generally asphaltic and. Summary of findings and implementation plan mdsha project no. Pdf guidelines for implementing nchrp 7a me design. A mechanisticempirical pavement design guide mepdg has been developed in the usa under nchrp 1 37a in 2004 to address shortcomings in the current pavement design methods. It is strongly encouraged this memo is read prior to downloading or viewing mechanisticempirical design guide. Nchrp s novel coronavirus disease covid19 response. Mepdg includes two models for levels 2 and 3 hotmix asphalt hma dynamic modulus e predictions. Database support for the mechanisticempirical pavement. The aashto interim edition of the mechanisticempirical pavement design guide manual of practice mepdg and related software developed under nchrp provides methodologies for the analysis and performance prediction of different types of flexible and rigid pavements. First, it is one of the primary material property inputs in the mechanisticempirical pavement design guide mepdg and software developed by nchrp project 1 37a.
Implementation of the nchrp 1 37a design guide final report volume 1. Thus, test sections located in adjacent states, which performed more poorly than montana sections, were used to determine local calibration adjustment factors. The study focused on the verification, calibration, and validation of the rutting models in the mepdg using both field and apt sections. This distribution of the mepdg developed in nchrp project 7a is made in the interest of information exchange, and for the purposes of introducing the design guide and software to the pavement design and engineering community and encouraging their thorough evaluation by a wide range of potential end users in the public and private sectors. Introduction to mechanisticempirical pavement design. Implementation of the aashto mepdg in colorado jay goldbaum, p. Calibrating the mechanisticempirical pavement design. The development of the mechanisticempirical pavement design guide mepdg under national cooperative highway research program nchrp projects 1 37a and 140d has significantly improved the ability of pavement designers to model and simulate the effects of the combination of traffic and climate on future pavement damage, distress, and smoothness. Calibrate and validate the mepdg, and accompanying software, for arizona conditions. However, it is substantially more complex than the 1993 aashto design guide and it requires significantly more inputs from designers.
Download scientific diagram 1 mepdg design procedure nchrp 7a. Nchrp 7a is highly interactive and integrally tied to the analysis of ac permanent deformation development under nchrp 919. The performance predicted by these methodologies in terms of distresses such as cracking, rutting. Chapter two mechanisticempirical pavement design guide. This approach is similar to the one used in nchrp project 7a to develop nals defaults provided in the nchrp 7a mepdg software and in darwinme tm software. This version will expire when the guide and software are available from aashto or. Guide for mechanisticempirical design of new and rehabilitated pavement structures final document. Esals in mepdg 100 percent fhwa truck class 5 and zero percent for. The online version of the mechanisticempirical pavement design guide is available to. Vdot preparation plan for the implementation of the.
The mechanistic empirical pavement design guide mepdg developed under the nchrp 1 37a initiative is a significant advancement in pavement design. Trbs national cooperative highway research program nchrp report 719. Read calibration of rutting models for structural and mix. Trbs national cooperative highway research program nchrp synthesis 457. The pavement design guide is provided in an adobe pdf format that is readonly, nonsave, nonprintable, and noneditable. In 1996, the national cooperative highway research program nchrp launched project 1 37a to develop a new design guide for pavement structures.
Implementation of the aashto mechanisticempirical pavement design guide and software documents the experience of transportation agencies in the implementation of the 2008 american association of state highway and transportation officials aashto mechanisticempirical pavement design guide. Mepdg traffic loading defaults derived from traffic pooled. Dgit workshops and training mechanistic empirical design. National cooperative highway research program impacts on. The online version of the mechanisticempirical pavement design guide is available to anyone with internet access who has an interest in evaluating the guide and software. Pdf mechanisticempirical pavement design guide mepdg. In support of the fhwa office of asset management, ara was a member of the team that developed the pht technology and software. The performance models used in the mepdg are calibrated using limited national databases and, thus, it is necessary to calibrate these models for local highway agencies implementation by taking into account local materials, traffic information, and environmental conditions. The results suggest that the default design criteria incorporated in the nchrp project 7a software are broadly consistent with what would be observed historically from.
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