First, design compaction levels are established and materials are selected and characterized. In the mix design process, as asphalt binder content is selected that will provide four 4 percent air voids when the mix is compacted to n design gyrations. The superpave mix design list window displays superpave mix designs for selected effective dates, approved dates, material codes, and producersupplier codes. Superpave mix design process starts with asphalt binder and aggregate selection. One of the principal results from the strategic highway research program shrp was the superpave mix design method. This method covers the procedure for designing concrete mixes and is based on the absolute volumes of the various components of the mix, i. It is the standard procedure at mndot to furnish estimated mix proportions, prior to starting the work, for the purposes stated below. The primary aim of a mix design method is to obtain proportions. Departments mix design template, when electing to verify conformance, to calculate the percent of class a aggregate retained on the no. Properties considered in mix design superpave mix design.
Asphalt mixture design workshop federal highway administration version 6. One of the key components of superpave is materials selection. Mix properties are required to be measured in volumetric terms as well as weight. Volumetric requirements for superpave mix design the. Description construct a hot mix asphalt hma pavement layer composed of a compacted, superpave sp mixture of aggregate and asphalt binder mixed hot in a mixing plant. Mix design in hot mix asphalt, binder and aggregate are blended together in precise proportions. Air voids air voids are small air spaces or pockets of air that occur between the coated aggregate particles in the final compacted hma. Materials selection binder the design process starts with material selection. The superpave mix design method was designed to replace the hveem and marshall methods. Pdf implementation of superpave mix design for airfield. The first article covering the early design practices through the marshall and hveem systems was published in the spring 20 issue of asphalt magazine. The superpave mix design manual for new construction and overlays.
This section briefly discusses the superpave mix design method wapa pavement note on mix design. The pervious concrete mix design calculator is intended to be used by the concrete design professional. Its pretty much as i expected its the manual for how to design a pavement using superpave. However, the projects and associated plans were done with english units. However, the existing superpave design system does not properly address perform. Particular attention has also been paid to the realworld process of asphalt mixture mix ing. It was developed in 1987 by the strategic highway research program shrp researchers. Superpave mix design system integrates material selection asphalt and aggregates and mix design into procedures based on projects structural section, climate and design traffic. Mix design of concrete with high content of mineral additions. An example of proportioning a mix design through use of this form is detailed in table 3. Rational mix design of lightweight concrete for optimum. Superpave consists of 1 an asphalt binder specification, 2 an hma mix design method and 3 hma tests and performance prediction models. It is a short name for superior performing asphalt pavement. The relative proportions of these materials determine the physical properties of the hma and ultimately how the hma performs as a finished pavement.
Newcomb university of minnesota department of civil engineering 500 pillsbury dr. 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. Volumetric requirements for superpave mix design examines whether changes to the recommended superpave mix design criteria for voids in mineral aggregate, voids filled with asphalt, and air voids content might further enhance the performance and durability of hot mix asphalt. This section briefly discusses the superpave mix design method. The concrete mix design cmd for qcqa superstructure concrete must. Payment adjustments will apply to hma placed under this specification unless the hma is deemed exempt in accordance with section 344. 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. Mar 20, 20 in the mix design process, as asphalt binder content is selected that will provide four 4 percent air voids when the mix is compacted to n design gyrations. 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. The design aggregate structure, when blended at the optimum asphalt binder content, should yield acceptable volumetric properties based on the established criteria. Kennedy university of texas at austin michael anderson the asphalt institute strategic highway research program national research council washington, dc 1994.
The design will be submitted and evaluated according to the hma production manual, procedures for hma mix design processing. Aggregate sizes of the mix design should be checked prior to use in thinner lifts. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. At the beginning of the mixture design, as the maximum aggregate size is 20 mm, it is convenient to make the. 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. Hdot has built several pavements using the superpave mix design method and plans on doing even more in the future. The pervious concrete mix design calculator is intended to be used by the concrete design professional that is competent to evaluate its significance and limitation and who will accept responsibility for its proper application.
A mix design procedure for highperformance concrete mixes has been. Superpave mix design may also be downloaded for a specific contract. Procedure in kytc, this report supplies the same information that is in the mix design inventory, and it will have information for district mix design approvals. 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. The key aspect to the performance of any asphalt mixture is the selection of the optimum materials that will be used in the mixture. N maximum is the number of gyrations required to produce a density which some safety factor to ensure that the mixture does not densify too much resulting in low inplace voids thus. Properties considered in mix design superpave mix design method. See all 5 formats and editions hide other formats and editions. Superpave mix design 48 determining the design asphalt content the selected trial blend becomes the design aggregate structure. Acknowledgments becky mcdaniel, purdue university principal investigator, nchrp 912 research ed harrigan, nchrp senior program officer, nchrp 912. Design calculation for selecting proportions for initial concrete mix design.
Superpave mix design was developed as part of the strategic highway research program shrp from 1987 to 1993. Average daily traffic adt greater than 15,000 recommended minimum lift thickness 2 9. 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. Mix design procedures and tests shall be in accordance with aashto r 35 except as noted below. Understanding superpave mix design federal highway administration 1996 video vh554 this video promotes and explains the basics of the superpave superior performing. National pavement implementation executive task group pietg highlighted bmd as needed focus area balanced mix design task force development history shrp2 peer to peer exchange 2016. Asphalt concrete commonly called asphalt, blacktop, or pavement in north america, and tarmac, bitumen macadam, or rolled asphalt in the united kingdom and the republic of ireland is a composite material commonly used to surface roads, parking lots, airports, as well as the core of embankment dams. Using rap in the superpave mix design system mike anderson, asphalt institute cupga 2005 victoria, bc november 6, 2005. A superpave mix design includes several processes and decision points. The comparison concentrated on the resistance to rutting and lowtemperature cracking of asphalt mixes prepared using the two design methods. Bruce marshall, and later refined in the 1940s by the corps of engineers for designing asphalt mixtures for airfield pavements.
Selection of the design aggregate structure design blend consists of determining the aggregate stockpile proportions and corresponding combined gradations of the mix design. Trbs national cooperative highway research program nchrp report 567. Design and optimum are often used interchangeably however, they mean two different things there can be many design binder contents for a mix, but only one truly optimum optimum indicates the best binder content based on intended application, performance requirementsneeds, and ultimately economics. The superpave mix design manual for new construction and overlays ronald j. Batch, mix, and compact more samples with this gradation with four asphalt contents. Different concrete mix designs with different materials, even with the same proportions, can have significantly different properties of strength. Density allows us to convert from units of weight to volume. The hma mixture will be provided according to the requirements of the standard specifications except where modified herein. Designing concrete mixtures there are three phases in the development of a concrete mixture. Process has been referred to as a balanced mix design approach. Superpave level one mix design at the local government level final report prepared by. Initial mix design details3 mix design changes and challenges construction issues performance todate a short note on units is warranted. Volumetric requirements for superpave mix design examines whether changes to the recommended superpave mix design criteria for voids in mineral aggregate, voids filled with asphalt, and air voids content might further enhance the performance and durability of hotmix asphalt.
The superpave regional centers are a unique source of expertise and assistance for highway agencies in their quest to build better, longer lasting roads. One thing i had been wondering prior to purchase was, is there a difference between sp1 and sp2. Wsdot uses the superpave mix design method also commonly called the gyratory mix design method. Trbs national cooperative highway research program nchrp report 573. Superpave gyratory method washington asphalt pavement. Superpave is an overarching term for the results of the asphalt research portion of the 1987 1993 strategic highway research program shrp. The objective of this study was to compare the superpave mix design to the marshall mix design on a typical aggregate source in wyoming. The mixture is designed according to the absolute volume method given by aci. Superpave overview nthe final product of the shrp asphalt program area is superpave. 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.
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. 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. 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. Hveem mix design is still used in california and other western states. 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. In mix design testing and analysis, density of the compacted specimen is usually expressed in pounds per cubic foot lbft3. Superpave procedure is considered as an improved method for producing a good performing asphaltic paving mix. While this mix design procedure has performed well for airfield and. The superpave mix design window has a copy function located under services on the description folder tab. The superpave mix design manual for new construction and. This is the second of two articles on the history of mix design.
Then, mixture samples are prepared and laboratory test results are compared to design criteria. Like the hveem and marshall methods, the superpave method has been proven to produce quality hma from which longlasting pavements can be constructed. The hma mixture design will be provided by the contractor. Using rap in the superpave mix design system mike anderson, asphalt institute cupga 2005. Marshall mix design was originally developed by a mississippi state highway departmen t engineer, mr. History of design air voids national asphalt pavement.
Also, some of the testing results are in english units and some. These volumetric properties are then evaluated to select a mix design or to control the mixture quality during production. History of asphalt mix design in north america, part 2. This policy will be used only for mix designs containing less than or equal to 25% natural sand. Block 14 superpave mix design linkedin slideshare. Verifying gyration levels in the ndesign table examines the gyration levels in the ndesign table table 1 of american association of state highway and transportation officials standard practice r 35, superpave volumetric design for hotmix asphalt, in order to determine if they are correct for the. The marshall mix design procedure was originally developed in the 1940s for designing hot mix asphalt for airfield pavements. Asphalt mixtures have been used in pavement construction since the beginning of the twentieth. There are two methods for selecting the concrete mix proportions, by weight basis and by absolute volume basis. The volumetric analysis common to the hveem and marshall methods provides the basis for the superpave mix design method.
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