Superpave design aggregate structure considering uncertainty. Performance by design transportation research board. Sp2 by the asphalt institute, lexington, kentucky or aashto standard practice. Aggregate sizes of the mix design should be checked prior to use in thinner lifts. Superpave volumetric mix design and analysis volume i i. Superpave this surface mix is recommended for most surface applications. Federal highway administration abstract superpave is an acronym for superior performing asphalt pavements. Pdf the quality of asphalt concrete in flexible pavements plays a major role in the. Kennedy university of texas at austin michael anderson the asphalt institute strategic highway research program national research council washington, dc 1994. The objective of the superpave mix design system is to define an economical blend of asphalt binder and aggregate that yields a paving mix having. Adaptation of superpave asphalt concrete mix design.
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. This method may be used with laboratoryprepared specimens, as in the mix design process, or with plantmixed material during construction. This text will explain the method of compacting samples of the superpave mix using the superpave gyratory compactor and determining their percent compaction. Pdf comparison of marshall and superpave asphalt design. Asphalt institute sp2 superpave mix design, 3rd ed. Generally, this results in a paving mix which is coarser, has less sand, and less liquid asphalt. Ls309 superpave mix design ls311 stone mastic asphalt mix design. Marshall mixes are no longer readily available and should be replaced with the appropriate superpave specifications. The compaction devices from the hveem and marshall procedures have been replaced by a. See all 5 formats and editions hide other formats and editions.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. This section briefly discusses the superpave mix design method.
Topics are presented in the logical progression of mix design steps. Matt witczak, a simple performance test is being identified developed. Hot mix asphalt pavement design guide the maryland asphalt association,inc. Superpave mix design procedure in accordance with these specifications and in reasonable close conformity with the required lines, grades, thicknesses, and typical. Superpave overview nthe final product of the shrp asphalt program area is superpave. A superpave mix design includes several processes and decision points. The superpave mix design manual for new construction and overlays ronald j. The superpave regional centers are a unique source of expertise and assistance for highway agencies in their quest to build better, longer lasting roads.
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. Average daily traffic adt greater than 15,000 recommended minimum lift thickness 2 9. Much of the material contained in this manual was originally produced by the asphalt. There are four important superpave parameters which the owner must specify in order to insure the proper design. Selection of materials aggregate, binders, modifiers, etc. 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. Departments mix design template, when electing to verify conformance, to calculate the.
Hdot has built several pavements using the superpave mix design method and plans on doing even more in the future. The change involved a switch from the old hveem design method to the superpave design method. M 323 superpave volumetric mix design r 30 mixture conditioning of hotmix asphalt hma r 35 superpave volumetric design for hotmix asphalt hma r 90 sampling of aggregates. Superpave is a state of the art paving system which our industry and the state of maryland embraced in the late 1990s. Superpave mix design tests methods and requirements by john a. The superpave system ties asphalt binder and aggregate selection into the mix design process, and considers traffic and climate as well. Cominsky university of texas at austin with contributions by. The mix design submission shall include certification from an independent laboratory stating that. Seniorgraduate hma course superpave mix designhma superpave mix design 1 2. Superpave mix design for local agencies 183idm270122. Evaluation of moisture sensitivity of the design mixture. Compact these trial mixes in the superpave gyratory compactor figures 1, 2 and 3.
Simple performance test for superpave mix design m. 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 superior performing asphalt pavement superpave mix design system was developed under the strategic highway research program shrp, which was completed in 1993. This course provides an overview of the superpave mix design for local agencies and adjustments needed to start transitioning to the new mix design. The superpave mix design manual for new construction and. Elbasyouny arizona state university tempe, az and h. 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 jmf must be based on a hma mix design determined as described in the superpave mix design sp2 manual by the asphalt institute. Harrigan strategic highway research program ronald j. Superpave mixes are designated as being level 1, 2, or 3. The new mix design accounts for traffic loading and environmental conditions and includes a new method of evaluating the asphalt mixture. Material specification for superpave, stone mastic and warm mix asphalt page 5 of 28 ts 1151 september 2017 performance graded asphalt cement pgac means and asphalt binder that is an asphaltbased cement produced from petroleum residue, either with or without the addition of nonparticulate. Guidelines for incorporating rap in the superpave system and a manual for use by laboratory. 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.
The superpave mix design system provides flexibility to deal with one, two, or all three of the major distress types which it addresses. The us was looking for a new system to overcome pavement problems such as rutting and low temperature cracking that had become common with the use of design systems such as marshall and hveem. Properties considered in mix design superpave mix design. Nchrp report 465 simple performance test for superpave. The product of the shrp asphalt research program thomas w. The superpave mix design system is quickly becoming the standard system used in the united states us. First, design compaction levels are established and materials are selected and characterized. 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. Superpave gyratory mix design discussion in 1987, the strategic highway research program shrp began developing a new system for specifying asphaltic materials.
Superpave includes a new mixture design and analysis system based on performance characteristics of. Pdf superpave design aggregate structure considering. Then, mixture samples are prepared and laboratory test results are compared to design criteria. Prepare 6 initial samples, two at the proposed design asphalt content, two at 0. Superpave mixture design and analysis is performed at one of three increasingly rigorous levels, with each level providing more information about mixture performance. Pdf the superpave mixdesign of asphalt mixtures using the gyratory compactor is a. Soundness is the percent loss of materials from an aggregate blend during. The final product of the shrp asphalt research program is a new system called superpave, which is short for superior performing asphalt pavements. Integrate the binder and mix requirements into prs for hma construction. Simple performance test for superpave mix design national cooperative highway research nchrp program report 465. 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. Superpave in 1998, the mainedot changed its method of designing hot mix for maine roads. The superpave design process is part of a total pavement design system.
Superpave volumetric mix design four major steps in the testing and analysis process. Superpave gyratory method washington asphalt pavement. Design traffic level million esals2 coarse aggregate angularity. The relative proportions of these materials determine the physical properties of the hma and ultimately how the hma performs as a finished pavement. 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. Develop an economical blend of aggregates and asphalt binder that meet design and functional requirements historical mix design methods marshall. Like the hveem and marshall methods, the superpave method has been proven to produce quality hma from which longlasting pavements can be constructed.
As traffic levels and loading conditions increase above 1 million 80kn 18,000lb equivalent singleaxle loads esals during a pave. However, the existing superpave design system does not properly address perform. This study aims to compare the design of asphaltic concrete by the traditional marshall and the superpave methods of mix design. Mix design in hot mix asphalt, binder and aggregate are blended together in precise proportions. Worksheet for a superpave mix design continued design curves for proposed job mix formula jmf air voids v. Superpave is a system of components that work together to provide a superior performing asphalt pavement. Superpave volumetric mix design originally termed superpave level 1 is an improved material.
History of asphalt mix design in north america, part 2. The first article covering the early design practices through the marshall and hveem systems was published in the spring 20 issue of asphalt magazine. This compactor is specific to the superpave mix design method. 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. The system includes an asphalt binder specification, a hotmix asphalt hma design and analysis system, and computer software that integrates the system components. Batch, mix, and compact more samples with this gradation with four asphalt contents. This is the second of two articles on the history of mix design. 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. The volumetric analysis common to the hveem and marshall methods provides the basis for the superpave mix design method.
Ts 1151 superpave, stone mastic and warm mix asphalt. Superpave mix for each there is a compactoin level mix size bnider grade you need to know. It is the product of the strategic highway research program. Mix designations superpave hot mix asphalt 25h64 base course. The superpave binder specification and mix design system include various test equipment, test methods, and criteria. Therefore, superpave mix designs usually draw upon several different aggregate stockpiles and blend them together in a ratio that will produce an acceptable.