Special edition of summary of progress through 1988. Implementation of the nchrp 1 37a design guide final report volume 2. The specific goal was to develop an aashto mechanistic empirical pavement design procedure by the year 2002. Implementation of the nchrp 1 37a design guide final report volume 1. Empirical pavement design mepdg implementation girum merine, pe senior pavement engineer, vdot material division. Data collection, processing, analysis and evaluation of pavements using ltpp database for 23 pavement sections located in seven different states. Department of civil and environmental engineering the university of maryland college park, md 20742. Oct 02, 2012 its a mouthful to say, but that doesnt have to mean biting off more than you can chew. High volume secondary roadways average daily traffic adt 10,000 maybe designed using aashtoware pavement me version 2. Background national cooperative highway research program nchrp project 1 37a, the largest in the over 40year history of the program, was recently concluded with the successful delivery of a recommended mechanisticempirical pavement design guide to nchrp by the research team of eres consultants, its subcontractors arizona state university and fugro consultants lp, and numerous individual. Semantic scholar extracted view of implementation of the nchrp 7a design guide final report volume 2. Pdf sensitivity of nchrp 7a pavement design to traffic input. Pdf mechanisticempirical pavement design guide mepdg.
This in part is due to the paucity of field data available for calibrating the empirical distress models for drainage effects. These are the dynamic modulus, flow time, and flow number tests. The new mepdg procedure involves three major steps. Pdf this study deals with the sensitivity of the nchrp 7a pavement design. The national cooperative highway research program nchrp project 919, superpave support and performance models management, recommended three simple performance tests spts to complement the superpave volumetric mixture design method. 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. Calibration of nchrp 1 37a software for the washington state department of transportation. In 2004, nchrp 7a was completed and delivered a mechanisticempirical pavement design guide and accompanying software. Mdots past, present, and future with me pavement design. The objectives of this study are 1 to compare flexible pavement designs and performance between the empirical 1993 aashto pavement design guide and the mechanisticempirical. Proceedings of the northcentral states me pdg user group. Webcasts of design guide workshops mechanistic empirical. Introduction to mechanisticempirical pavement design guide. Nchrp 1 37a design guide nchrp 1 37 development of the 2002 guide.
The current version of the nchrp 1 37a design software does not yet include the capability for directly modeling drainage influences. This site will provide progress reports as well as links to other merelated resources. Appendix d nhi05037 federal highway administration. Shariq momin senior traffic engineer arcadis linkedin. Nchrp 1 37a used materials and performance data from test facilities from across the nation. Phase ii, identified stateofthepractice performance models and supporting test methods for use in the recommended mechanisticempirical pavement design guide and software. Use the known mechanistic properties of materials to compute the internal material responses in. Nchrp 9 software lcreates required nchrp 7a data sets, for example the number of axles per truck by type of axle for each class of trucks seasonal factors from continuous classifier data twrg load distributions from load spectra. Development of the 2002 guide for the design of new and rehabilitated pavement structures consisted of applied research associates, inc. Pccp models for rehabilitation and reconstruction decisionmaking.
Characterization of louisiana asphalt mixtures using april. Guidelines for implementing nchrp 7a me design procedures in ohio. This guide incorporates pavement knowledge and experiences, which were developed during the last 50 years. That is the origination of the popular name, 2002 guide. This design guide is much more complex than the old aashto 1993 design method. This distribution of the mepdg developed in nchrp project 7a is made in. Longtime members of the transportation community, we have served hundreds of municipal, state, federal, military, and private organizations worldwide with improved pavement designs and performance. The eicm predicts temperature, moisture content, frost and thaw depths, among other parameters throughout the life of a pavement by using the inputs air temperature, wind speed, percent sunshine, precipitation, and relative humidity. Pavements, in conjunction with the national cooperative highway research program nchrp in nchrp report 7a, developed the mechanisticempirical pavement design guide mepdg. The products developed under nchrp 7a have provided advancements in pavement design practices and work is continuing under nchrp, fhwa and various state agencies. Pdf implementation of the nchrp 7a design guide final. Sep 27, 20 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 program nchrp 7a project and adopted and published by aashto. Development of design methods for geosynthetic reinforced.
Nchrp project 7a, development of the 2002 guide for the design of new and rehabilitated pavement structures. Traffic data required for each of the three hierarchical input levels. Me pavement design is the latest generation of pavement design methodologies. If youre involved with pavement design, you should have at least a basic understanding of the mechanisticempirical pavement design guide, also known as the mepdg. In both cases, the nchrp 1 37a software automatically preprocesses all of the input data required for the analysis e. Implementation of the aashto mepdg in colorado jay goldbaum, p. The nchrp 7a design software takes all of these traffic inputs and. Evaluation of nchrp 7a rigid pavement design software. Introduction to mepdg flexible pavement design 3 pdhs. Sensitivity of nchrp 7a pavement design to traffic input. Acknowledgements the research team for nchrp project 7a. Implementation of the nchrp 7a design guide final report volume 1.
The calibrated faulting and roughness models are able to present the typical performance of wsdot pcc pavements. The project produced a mechanisticempirical me pavement design guide that includes a a guide for me design and analysis, 2 companion software with documentation and a user manual, and 3 implementation and training materials. The purpose of this project was to develop design methods for geosynthetic reinforced flexible pavements that are compatible with the methods being developed in nchrp project 1 37a. Highway administration, aashto, or the individual states participating in the national cooperative highway research program. Classification of wim data as level 1 through 3 is based on the specific location at which data are collected e. Nchrp 1 37a models proved to be more suitable for wsdot conditions. Nchrp s novel coronavirus disease covid19 response. Ara provides comprehensive pavement engineering research and consulting services for roadways, airfields, parking areas, and intermodal facilities.
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. Mar 30, 2004 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. These samples are used to create a matrix of design scenarios which were then be run through the nchrp 7a design software, to predict. A significant amount of washington state department of transportation wsdot portland cement concrete pcc pavement that was placed in the 1960s is nearing the end of its serviceable life and must soon be rehabilitated or replaced. Later he joined as the chair of the department of civil and environmental engineering on march 2, 2015 and as the dean of school of engineering and physical sciences seps on march 4, 2019. Mndot, the university of minnesota, and the lrrb have initiated a project to further calibrate the 2002 design guide to minnesota materials, conditions, and performance. Information about projects initiated subsequent to 1988 is available below. Nchrp 7 development of the 2002 guide for the design. Acknowledgements the research team for nchrp project 1 37a.
Nchrp 7a, mechanistic empirical pavement design, distress. This document is also intended to help provide guidance for designers using the aashtoware pavement me software. The methods developed in this project, while compatible with the nchrp 1 37a design guide, are. The guide for the mechanisticempirical design of new and rehabilitated pavement structures developed under nchrp project 1 37a is the stateoftheart procedure for the design of flexible and rigid pavement structures. The michigan department of transportation mdot is currently working towards implementing the new aashtoware me pavement design software. 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. This study deals with the sensitivity of the nchrp 7a pavement design guide predictions to traffic data input. As stated in the nchrp 1 37a final report nchrp 1 37a, 2004. Summary of findings and implementation plan mdsha project no. Calibration of nchrp 7a software for the washington. As a result, we felt that the time was right for recapturing the pavement engineering state of the art in a textbook. Processed traffic data using trafload software as an input for nchrp 7a software, mechanisticempirical pavement design guide mepdg for new york state department of transportation nysdot.
A number of traffic data collection scenarios are simulated with the use of. The software requires detailed inputs on distress limits, reliability, traffic, climate, and materials. Geotechnical aspects of pavements reference manual appendix d. Vdot preparation plan for the implementation of the. This guide incorporates latest pavement knowledge and experiences, which were developed during the last 50 years.