The mepdg was subsequently renamed the darwinme in april 2011 and, most recently, marketed as the aashtoware pavement me design as of february. This paper focuses on the implementation of the me design in the kingdom of saudi arabia by developing a. Useroriented computational software and documentation based on the design guide procedure. Nchrp 1 39 lrequired traffic loads are defined by the nchrp 1 37a project software lnchrp 1 39 supplies a more robust mechanism to enter that data l9 software converts traffic monitoring data into pavement design inputs.
Memorandum from aashto containing project scope and information. Sensitivity of the nchrp 1 37a pavement design guide, a global approach. Implementation of the nchrp 1 37a design guide final report volume 1. Pccp models for rehabilitation and reconstruction decisionmaking.
Implementation of the nchrp 7a design guide final report volume 1. Accuracy of current complex modulus selection procedure. To account for the time dependency of hma, mepdg recommends calculation of the frequency of the applied load as a function of the vehicle speed and the pavement structure. Implementation of the nchrp 1 37a design guide final report volume 2. Guide for mechanisticempirical design transportation research. The mechanisticempirical pavement design guide, related documentation, and the latest version of its software are available online for evaluation through 30 september 2011. This report provides the details associated with these findings. It is based on past mndot experience, the experience of other groups and agencies with similar requirements, and the. Ncat report 14 04 flexible pavement design state of. Comparisons of flexible pavement designs aashto empirical.
The nchrp 1 37a design software takes all of these traffic inputs and computes the number of applications of each axle load magnitude by axle type single, tandem, tridem, quad and month. It is strongly encouraged this memo is read prior to downloading or viewing mechanisticempirical design guide. The nchrp 1 37a software cannot model pcc thicknesses less than 7 inches. The implementation of the mepdg requires a large number of design inputs that characterizes traffic.
This objective will be accomplished through developing. Investigation of aashtoware pavement me designdarwinme. The software was freely available, though considered a beta. One can obtain different vdf values depending on the method of calculation also. Pccp models for rehabilitation and reconstruction decision. Evaluation of mechanisticempirical design procedure mdsha project no. Improving traffic characterization to enhance pavement design and performance load spectra development, washington state. Nsu research portal nsu portal north south university. With innovations ranging from the advent of superpave, the data generated by the long term pavement performance ltpp project, to the recent release of the mechanisticempirical pavement design guide developed under nchrp study 1 37a, the field of pavement engineering is experiencing significant. With innovations ranging from the advent of superpave, the data generated by the long term pavement performance ltpp project, to the recent release of the mechanisticempirical pavement design guide developed under nchrp study 1 37a, the field of pavement engineering is experiencing significant development.
Development of the 2002 guide for the design of new and rehabilitated pavement structures. Investigation of aashtoware pavement me designdarwin. Guide for mechanisticempirical design new and rehabilitated pavement structures introduction. The nchrp 1 37a software also includes a provision for entering local or regional field calibration factors instead of the national values derived from the ltpp database.
Guidelines for implementing nchrp 1 37a me design procedures in ohio. The calibrated models in nchrp 1 37a software can be used by wsdot pavement specialists to better predict future pcc pavement performance. Flowchart of the pavement me design nchrp 7a, 2004. Nchrp develops mepdg 2008 mepdg is an aashto standard 2009 cdot begins implementation 2011 cdot adopts mepdg 1999.
Characterization of unbound materials soilsaggregates for. National cooperative highway research program wikipedia. The pavement engineering industry called for a more robust, mechanisticbased. Introduce the nchrp 1 37a me guide discuss status describe key elements highlight capabilities. Nchrp 7a, mechanistic empirical pavement design, distress. It requires significantly more input from the designer. National cooperative highway research program nchrp. Characterization of louisiana asphalt mixtures using april.
It also includes guidance for performing pavement surveys, preparation of design recommendations, and submittal of the materials design recommendations mdr report formerly called the soils letter. The products developed under nchrp 1 37a have provided advancements in pavement design practices and work is continuing under nchrp, fhwa, and various state agencies. Characterization of louisiana asphalt mixtures using simple performance tests and mepdg 5. Trbs national cooperative highway research program nchrp report 530. Guide for mechanisticempirical design of new and rehabilitated pavement structures nchrp 1 37a.
Nchrp 141 calibration of fracture predictions to observed. Errors in predicted alligator fatigue cracking for all nchrp 7a calibration. National cooperative highway research program nchrp synthesis 403 research sponsored by the american association of state highway and transportation officials in cooperation with the federal highway administration subscriber categories highways operations and traffic management adaptive traffic control systems. 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. Pdf comparing witczak nchrp 140d with hirsh e predictive. Submission of interest information topic 4406 guide mepdg. Nchrp 1 41 calibration of fracture predictions to observed reflection cracking in hma overlays robert l. Summary of findings and implementation plan mdsha project no. This site will provide progress reports as well as links to other merelated resources. Nchrp 1 37a is highly interactive and integrally tied to the analysis of ac permanent deformation development under nchrp 919.
Overloading analysis of bituminous pavements in india using m. Nchrp synthesis 403 adaptive traffic control systems. The nchrp 7a design software takes all of these traffic inputs and computes the number of applications of each axle load magnitude by axle type single, tandem, tridem, quad and month. 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 1 37a project and adopted and published by aashto. Case study in spain jose ramon ballesteros martineza, rafael. These axle load spectra are a primary input to the mechanistic pavement structural response models.
Level 1 is considered the most accurate because it uses the actual axle. Classification of wim data as level 1 through 3 is based on the specific location at which data are collected e. The guide, which is scheduled for release to state highway agencies as an nchrp product in. Influence of bedrock depth on predicted joint faulting. National cooperative highway research program nchrp project 1 37a was initiated to develop the mechanisticempirical pavement design guide me pdg and associated evaluation version 0. These samples are used to create a matrix of design scenarios which were then be run through the nchrp 1 37a design software, to predict pavement performance. Typical resilient modulus values for unbound granular and subgrade materials nchrp, 200410 table 3. In the design guide, a predictive rutting system was developed to evaluate the permanent deformation within all rut susceptible layers generally asphaltic and all unbound material. The mechanisticempirical pavement design guide mepdg the mechanisticempirical design guide for new and rehabilitated pavement structures 1, known as mepdg, was released in 2004 under the nchrp project 1 37a. The design guide developed under national cooperative highway research program nchrp 1 37a project is a very complex pavement analysis tool, with many input factors which characterize materials, climate, traffic and construction. The guide includes procedures for the analysis and design of new, rehabilitated flexible. National cooperative highway research program nchrp implementation of the pavement design guide. Trbs national cooperative highway research program nchrp synthesis 457.
In response to the industrys need for a more robust pavement design and analysis methodology, ara developed the mepdg under nchrp project 1 37a. The mechanisticempirical pavement design guide mepdg was developed under national cooperative highway research program nchrp project 1 37a as a novel mechanisticempirical procedure for the analysis and design of pavements. Using only maximum stress in the fatigue transfer functions yielded a more finite number of critical damage locations that agree well with the nchrp 1 37a design software. Itd implementation plan for mepdg bayomy and elbadawy. A global sensitivity analysis samples the entire input parameter space of selected input variables. 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. Pdf rational modeling of tertiary flow for asphalt mixtures.
Nchrp 9 lrequired traffic loads are defined by the nchrp 1 37a project software lnchrp 9 supplies a more robust mechanism to enter that data l9 software converts traffic monitoring data into pavement design inputs. Accurate determination of critical structure responses plays a vital role in the ability of the mechanisticempirical pavement design guide mepdg to achieve a reliable pavement design. The research described herein was performed under nchrp project 1 43 by the transportation sector of applied research associates ara, inc. In 2004, nchrp 1 37a was completed and delivered a mechanisticempirical pavement design guide and accompanying software. The first model is the nchrp 1 37a while the second one is the nchrp 140d model.
Analysis of critical structure responses for flexible. Calibration of nchrp 1 37a software for the washington state department of transportation. Evaluation of the mechanistic empirical pavement design guide nchrp 1 37a, national research council, canada, september 2005. Aashtoware pavement me design pavement design software used to analyze and design pavements based on me principles developed under nchrp 1 37a. Traffic data required for each of the three hierarchical input levels. In the mepdg, the responses generated by a single axle are evaluated at a series of predefined locations, and responses under multiple axle gears are determined using the responses from a single axle following. The national cooperative highway research program nchrp has developed a new pavement design and analysis tool, the mechanisticempirical design guide for new and rehabilitated pavement structures,under nchrp 1 37a. 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.
Pavement me design software are generally used as level 3 inputs. The first is a catalog of recommended pavement design features which presents good practice recommendations for design features in an easytouse format for highway engineers. The national cooperative highway research program was established in 1962 under trb with a view to promote research on serious problems related to highway. Coordinate technical activities with other relevant nchrp and fhwa projects, including nchrp projects 1 37a, 916, 917, 918, and 920. Further improvements to the mepdg were made as part of nchrp 1. Nchrp related activities trb 83rd annual meeting washington, dc january 1115, 2004 nchrp contact. Me pavement 2 design guide objectives of the workshop.
A comprehensive, stateoftheart guide to pavement design and materials. Development and field validation of nchrp 142a topdown. Mar 30, 2004 useroriented computational software and documentation based on the design guide procedure. The mechanisticempirical pavement design guide mepdg uses the complex modulus to simulate the time and temperature dependency of hotmix asphalt hma. The nchrp 2019 annual report provides a concise list of research published in 2019 and a list of all active projects, projects completed in 2019, and projects that were approved in 2019 but are not yet under contract. Calibration of nchrp 7a software for the washington. Since 2006, ara has been the fhwas leading support contractor for deploying technology and innovation to the highway community. Models relating material index and strength properties to mr nchrp, 2004 9 table 2. Agency business plans and strategies for local implementation of the.
Nchrp ncat report 984 designing stone matrix asphalt mixtures volume iv mixture design method, construction guidelines, and quality control procedures nchrp 230 guardrail and median barrier crashworthiness. Development and field validation of nchrp 1 42a topdown cracking model reynaldo rey roque, ph. Guidance for transportation project management summary nchrp project 2069 1 summary transportation project management, for all modes of transportation, is under extreme budgetary, political, and community pressure to contain costs and improve efficiency in the delivery of projects on time and on budget. Peter stephanos director, office of material technology maryland state highway administration lutherville, md 21093 submitted by. 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. Department of transportation s federal highway administration fhwa. The national cooperative highway research program nchrp project 919, superpave support and performance. The annual report also presents detailed information about how nchrp operates with oversight by the aashto special committee on. The design guide represents a major change in the way pavement design is performed.
This manual provides background information pertaining to pavement design. Design of new and rehabilitated pavement structures, national cooperative highway research program, transportation research board of the national academies kaloush, k. The results suggest that the default design criteria incorporated in the nchrp project 1 37a software are broadly consistent with what would be observed historically from pavements designed with the 1993 aashto guide. The mepdg was subsequently supported by aashtos darwinme and most recently marketed as aashtoware pavement me design software as of february 20. The overall objective of nchrp project 1 37a is to develop and deliver the 2002 guide for design of new and rehabilitated pavement structures, based on mechanisticempirical principles, accompanied by the necessary computational software, for adoption and distribution by aashto. Implementation of the mepdg for flexible pavements in idaho. The michigan department of transportation mdot is currently working towards implementing the new aashtoware me pavement design software. The pavement design guide is provided in an adobe pdf format that is readonly, nonsave, nonprintable, and noneditable. 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.
The mechanistic empirical pavement design guide mepdg was developed under the national cooperative highway research program nchrp project 1 37a as a novel mechanicalempirical procedure for analysis and design of pavements. The prediction accuracy of the nchrp 1 37a viscositybased witczak model, nchrp 1 40dbinder shear modulus g based witczak model, hirsch model, and gyratory stability gs based idaho model was. Performancebased indicators as a tool to manage energy. The nchrp 1 37a pavement design guide 2 characterizes traffic in terms of axle numbers by type and their load frequenc y dist ribution, i. Chapter two mechanisticempirical pavement design guide.
Typically the critical damage location flipped from bottomup to topdown around an ebitd level of 20 to 25of due to unsupported areas of the slab, axle spacing. These data elements can be obtained directly from manufacturers databases or. Rational modeling of tertiary flow for asphalt mixtures. The me pdg was developed as a major enhancement on the existing american. 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. This feature permits local agencies to adjust the mechanisticempirical performance predictions to better reflect their local conditions. Mepdg provides significant potential benefits over the 1993 aashto guide. Ce 755 highway pavement design engineering online nc. Gazi salah uddin linkoping university department of management and engineering division muhammad yahya university of stavanger department of industrial economics, risk managem. Even at this reduced thickness, however, the predicted faulting for the shallow bedrock conditions is well below the design limit. Programs nchrp, project 1 37a 2004, to provide pavement engineers with a more effective design guide that responds to changing design inputs, needs and the environment. Insofar as possible, maintain active technical liaison with research groups outside the united states that are conducting related research projects. Nchrp project 207, research for the aashto standing committee on highways scoh, provides scoh with a means to conduct research needed by the committee and its subcommittees to fulfill their responsibilities. Sensitivity of nchrp 7a pavement design to traffic input.
Nchrp 1 37a models are able to be calibrated with some limited exceptions. Evaluation of indirect tensile test idt procedures for lowtemperature performance of hotmix asphalt evaluates the use of the indirect tensile creep and strength test procedures in american association of state highway and transportation officials standard method of test t32203 in mixture and structural design. Peter stephanos director, office of material technology maryland state highway administration lutherville, md 21093 written by. It is sponsored by american association of state highway and transportation officials aashto and the u. The results suggest that the default design criteria incorporated in the nchrp project 7a software are broadly consistent with what would be observed. National cooperative highway research program nchrp project 7a, 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 consultants. Research projects are conducted as tasks under the 207 project number as the committee approves work.
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