The user will be able to open up an existing mix design and copy all the details on the existing superpave mix design to a new superpave mix design and assign a new mix id. Nchrp report 452 recommended use of reclaimed asphalt pavement in the superpave mix design method, technicians manual page 2 rev. In the superpave mix design and analysis system, the mix designer selects and proportions materials to create an asphalt mix that will withstand the traffic and environmental conditions at a project site. The superpave design process is part of a total pavement design system. Although the new methods of mixture performance testing have not yet been established, the mix design method is wellestablished. The new mix design accounts for traffic loading and environmental conditions and includes a new method of evaluating the asphalt mixture. Superpave mix design is a structured approach consisting of the following four steps.
Tolerance limits for mdot verification of superpave mix designs. Cylindrical specimens are usually prepared by following a volumetric mix design approach by means of gyratory compactor, to aashto m 323 superpave volumetric mix design. A superpave mix design includes several processes and decision points. Aug 30, 2010 understanding superpave mix design federal highway administration 1995 video vh353 superpave, superior performing asphalt pavements, is presented as the mix design system for the next century. Understanding superpave mix design federal highway administration 1995 video vh353 superpave, superior performing asphalt pavements, is presented as the mix design system for the next.
Superpave mixes are designated as being level 1, 2, or 3. Adaptation of superpave asphalt concrete mix design. The jmf must be based on a hma mix design determined as described in the superpave mix design sp2 manual by the asphalt institute. Block 14 superpave mix design linkedin slideshare. Six samples of prebatched aggregate of sufficient mass to result in. Superpave laboratory study manual volume iii 7 compacted samples of the superpave mix are used to determine the volumetric and mechanical properties during the mix design phase and for quality controlquality assurance during construction. Materials manual superpave mix design manual march 29, 2005 superpave mix design manual page 7 figure 4 material identification c22 card 2. It is a multifaceted system with a tiered approach to designing asphalt mixtures based on desired performance. Materials selection binder the design process starts with material selection. When a mix contains additives and the source of asphalt cement changes from that used in the mix design, tests shall be redone to verify the dosage of such additives. The superpave mix design system was implemented in the united states with volumetric controls as the primary basis for selecting optimum asphalt content of mix designs. Understanding superpave mix design federal highway administration 1996 video vh554 this video promotes and explains the basics of the superpave superior performing.
This section briefly discusses the superpave mix design method. There is a procedure the superpave design manual that uses the specific gravities of the aggregates and the gradation. M 323 superpave volumetric mix design r 30 mixture conditioning of hotmix asphalt hma r 35 superpave volumetric design for hotmix asphalt hma. Kennedy university of texas at austin michael anderson the asphalt institute strategic highway research program national research council washington, dc 1994. Superpave includes some old rules of thumb and some new and mechanistic based features.
Design of txdot asphalt mixtures using the superpave. One of the principal results from the strategic highway research program shrp was the superpave mix design method. The superpave mix design method was designed to replace the hveem and marshall methods. The purpose of this workshop is to provide a basic understanding of the superpave mix design process and handson training using superpave. Dec 28, 2000 superpave is an improved system for specifying hot mix asphalt hma component materials, hma mix design and analysis, and pavement performance prediction. The superpave mix design manual for new construction and overlays. Set the design gyrations according to the lane current average daily truck. The superpave system has gone through several revisions in order to improve the durability and performance of. Superpave in 1998, the mainedot changed its method of designing hot mix for maine roads.
History of design air voids marshall mix design set up in late 1940s design voids set at 3 to 5% marshall mix compaction standard rolling train static steel wheel pneumatic tired 8% will densify under traffic to 4% density at end of life design density. One thing i had been wondering prior to purchase was, is there a difference between sp1 and sp2. Superpave mix design for local agencies 183idm270122. It is a mix design system that can be used for every type of pavement from golf cart paths and parking lots to the 400 series highways. The superpave system has gone through several revisions in order to improve the durability and performance of asphalt mixes. Calculating design life esals for superpave paving courses, the specification of 65 gyration asphalt mix designs will not be allowed on projects let after december 30, 2016. The superpave volumetric mix design method has a table for selecting the gyratory compaction effort corresponding to seven categories of design esals and four categories of high air temperatures. Matt witczak, a simple performance test is being identified developed.
A gyratory compactor simulates traffic conditions in the laboratory. Superpave this workshop is intended to demonstrate the superpave asphalt mixture design system developed by the strategic highway research program shrp, along with the application of certain innovative concepts in field management of asphalt mixes. Project file job mix formula procedures 415 job mix formula numbering system 417 superpave mix type designations 418 superpave jmf example 419 asphalt mix design and testing calculation formulas 420 thru 422 section 5. Key words hot mix asphalt, mixture design, texas gyratory compactor, superpave gyratory compactor. However, the existing superpave design system does not properly address perform. Its pretty much as i expected its the manual for how to design a pavement using superpave. The superpave system ties asphalt binder and aggregate selection into the mix design process, and considers traffic and climate as well. Payment adjustments will apply to hma placed under this specification unless the hma is deemed exempt in accordance with section 344. A visible fissure of varying length and orientation in the hma. Aggregate submitted for mix design verification should be split from aggregate used in the mix design. The volumetric analysis common to the hveem and marshall methods provides the basis for the superpave mix design method. Superpave asphalt mixture design workshop developed by the asphalt team thomas harman 202 4933072 federal highway administration, hrdi11 6300 georgetown pike, mclean, va 22101 john dangelo 202 3660121 john bukowski 202 3661287 federal highway administration, hipt 400 seventh street, s.
The minimum vma requirements are set based on the nominal maximum aggregate size. When shrp was completed in 1993 it introduced these three developments and called them the superior performing asphalt pavement system superpave. The product of the shrp asphalt research program thomas w. Superpave binder specification requires a new set of test equipment and.
One of the key components of superpave is materials selection. Superpave is about selecting the proper mix to suit the traffic and climatic conditions. The superpave mix design system is a comprehensive method of designing paving mixes tailored to the unique performance requirements dictated by the traffic. The answer is yes comparing my copy of sp2 to my friends sp1, the two books have a lot of overlap, but sp2 has less detail about asphalt selection. Superpave mix design criteria table 6103 412 superpave virgin asphalt grades used for various %s of rap table 6104 4 ncdot master job mix formula procedures. Then, mixture samples are prepared and laboratory test results are compared to design criteria. This work shall consist of furnishing a hma mixture using superpave mixture design methods. The contractor may substitute reclaimed asphalt pavement rap for a portion of the new materials required to produce hma. These volumetric properties are then evaluated to select a mix design or to control. Under the guidance of the trb superpave committee and the expert task group on communications, the report was drafted by neil f. This work consists of providing and placing hot mix asphalt hma mix using superpave mixture design methods. The most common method is engineering judgment which basically means that someone makes an educated guess based on past experience with a particular aggregate or similar aggregates. Description construct a hotmix asphalt hma pavement layer composed of a compacted, superpave sp mixture of aggregate and asphalt binder mixed hot in a mixing plant. Asphalt institute manual series 2 ms2 aashto r35 standard practice for superpave volumetric design for hotmix asphalt hma aashto r3002 standard practice for mixture conditioning of hotmix asphalt hma aashto m156, standard specification for requirements for mixing plants for hotmixed, hot laid bituminous paving mix.
The change involved a switch from the old hveem design method to the superpave design method. The superpave regional centers are a unique source of expertise and assistance for highway agencies in their quest to build better, longer lasting roads. The superpave trademark mix design system software contains a database of 5,3 united states and 1,515 canadian weather stations, which can be used to select a suitable performance grade of asphalt binder for a paving project, based on prevailing weather conditions in the area. Mix selection superpave uses a volumetric approach to mix design. As examples, at the discretion of the agency, designs for warm weather climates can concentrate on permanent deformation only or on permanent deformation and fatigue cracking. Cracked aggregate caused by construction operations. Design of txdot asphalt mixtures using the superpave gyratory. Moi section 960 superpave volumetric mix design and verification page 1 of 11 section 960 guidelines for superpave volumetric mix design and verification 960. Superpave is a system of components that work together to provide a superior performing asphalt pavement. For rhmagsp, asphalt rubber binder design and profile the jmf must be based on a hma mix design determined as described in the superpave mix design sp2 manual by the asphalt institute. History of design air voids national asphalt pavement.
This work consists of gyratory mix design, material, and quality control. Road test, conducted from 1958 to 1962, set the standard for pavement structural design. The superpave aggregate tests and criteria are described, including aggregate consensus and source properties, the aggregate gradation control points and the restricted zone. Mar 20, 2007 sharing knowledge of the superpave procedures throughout the highway industry will speed the implementation of superpave as the standard asphalt binder selection and mix design.
The hma mixture will be provided according to the requirements of the standard specifications except where modified herein. Term defined in asphalt institute manual ms2, mix design methods forasphalt concrete and other hotmix types. Superpave mix design may also be downloaded for a specific contract. Asphalt institute manual series 2 ms2 aashto r35 standard practice for superpave volumetric design for hotmix asphalt hma aashto r3002 standard practice for mixture conditioning of hotmix asphalt hma. As traffic levels and loading conditions increase above 1 million 80kn 18,000lb equivalent singleaxle loads esals during a pave. Although superpave is recognized as a significant system in. The superpave mix design window has a copy function located under services on the description folder tab. Mack, deputy chief engineer, new york state dot retired, whose energies and commitment have long served the trb superpave committee. Batch, mix, and compact more samples with this gradation with four asphalt contents.
Like the hveem and marshall methods, the superpave method has been proven to produce quality hma from which longlasting pavements can be constructed. The maryland state highway administration has taken the lead in developing gapgraded superpave mixes, which are stone matrix asphalt sma mixes designed with superpave performancegraded asphalts, fiber filler, and superpave testing equipment, including the gyratory compactor. Sharing knowledge of the superpave procedures throughout the highway industry will speed the implementation of superpave as the standard asphalt binder selection and mix design. This method covers the procedure for obtaining materials and the preparation, either by the contractor or the emulsion supplier, of a mix design as specified in the following manner.
Cominsky university of texas at austin with contributions by. Performance by design transportation research board miscellaneous report isbn 0309094143. This manual has been prepared as a practical guide for asphalt technicians in the construction and inspection of asphalt pavements. The superpave mix design manual for new construction and. This course provides an overview of the superpave mix design for local agencies and adjustments needed to start transitioning to the new mix design. Superpave performancebased testing for asphalt pavements. First, design compaction levels are established and materials are selected and characterized. Implementation of superpave, when fully developed, should minimize or eliminate rutting, fatigue cracking, and low temperature cracking. The design will be submitted and evaluated according to the hma production manual, procedures for hma mix design processing. Superpave mix for each there is a compactoin level mix size bnider grade you need to know. The hma mixture design will be provided by the contractor. Participants are responsible for their own lodging and food while at course.
Design traffic level million esals2 coarse aggregate angularity. The superpave mix design manual for new construction and overlays ronald j. Superpave mix design 48 determining the design asphalt content the selected trial blend becomes the design aggregate structure. Mar 20, 20 mixing place preheated aggregate in bowl and add hot asphalthma superpave mix design 25 26.
Using superpave mix designs, contractors can produce asphalt mixes to meet specific traffic loads and climates. Hdot has built several pavements using the superpave mix design method and plans on doing even more in the future. The vfa of the compacted mix is also determine to assure the mix will not be over asphalted. Superpave overview nthe final product of the shrp asphalt program area is superpave. The slab specimens that are mainly used for wheel tracking test hamburg test are obtained by. The key aspect to the performance of any asphalt mixture is the selection of the optimum materials that will be used in the mixture. The mix design is based on the volumetric properties of the hma in terms of the air voids v, voids in the mineral aggregate vma, and voids. Generally, this results in a paving mix which is coarser, has less sand, and less liquid asphalt.
The answer is yes comparing my copy of sp2 to my friends sp1, the. The final recommended sgc design gyrations should accommodate adequate asphalt in the mixture to improve resistance to cracking, raveling, and aging as well as decrease permeability while providing acceptable rutting resistance. The ontario ministry of transportation started implementation of superpave in the late 1990s and by 2006, superpave mix design technology was standard practice on all mto projects. This laboratory manual presents the superpave mix design system in a complete. Mixing place bowl on mixer and mix until aggregate is wellcoatedhma superpave mix design 26 27. Comparison between marshall and superpave mixtures design 396 alqadisiya journal for engineering sciences, vol.
755 316 450 686 791 1523 1398 1440 1555 1055 111 1329 53 880 805 450 89 61 76 642 563 1445 701 700 78 1469 549 395 1451 806 109 989 527 1111 915 483 828 186 66 672 1130 1363 655 1028 122 1259