Generally, this results in a paving mix which is coarser, has less sand, and less liquid asphalt. Prior to superpave, marshall mix design was widely used in the united states, and is by far, the most commonly used asphalt mixture design procedure worldwide. Superpave, in its final form consists of three basic components. The superpave mix design manual for new construction and overlays. See the recommended thickness design software section below for current and robust alternatives to sw1.
Superpave mix design 48 determining the design asphalt content the selected trial blend becomes the design aggregate structure. The key aspect to the performance of any asphalt mixture is the selection of the optimum materials that will be used in the mixture. There is no plan to update either software package. However, the existing superpave design system does not properly address perform. The superpave mix design manual for new construction and overlays ronald j. University of baroda 1 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. One of the key components of superpave is materials selection. The mix design process should provide an hma mix that will resist permanent deformation, should provide fatigue resistance, durability and resistance to moisture damage. 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. Volumetric requirements for superpave mix design the. Mix design procedures and tests shall be in accordance with aashto r 35 except as noted below. Superpave mix design was developed as part of the strategic highway research program shrp from 1987 to 1993.
A design and analysis system based on the volumetric properties of the asphalt mix. Pdf superpave design aggregate structure considering. 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 page is a repository of resources and documents related to that effort. History of design air voids national asphalt pavement. A superpave mix design includes several processes and decision points. Properties considered in mix design good hma pavements function well because they are designed, produced and placed in such a way as to give them certain desirable properties. Mix analysis tests and performance prediction models. The superpa ve su perior per forming asphalt pave ments design method of hot mix asphalt. There are several properties that contribute to the quality of hma pavements. The superpave system ties asphalt binder and aggregate selection into the mix design process, and considers traffic and climate as well.
History of asphalt mix design in north america, part 2. Nov 12, 2014 superpave versus marshall method of mix design marshall method, despite its shortcomings, is still probably the most widely used mix design method in the world. If you continue browsing the site, you agree to the use of cookies on this website. This text will explain the method of compacting samples of the superpave mix using the superpave gyratory compactor and determining their percent compaction. Refinements to the concepts of asphalt mix design procedures came about not only with. The primary features of marshall mix design are a densityvoids analysis and the stabilityflow test. A gyratory compactor simulates traffic conditions in the laboratory. Superpave overview nthe final product of the shrp asphalt program area is superpave. 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 mixture design provides for a functional selection, blending, and volumetric analysis of proposed materials, along with an evaluation of moisture sensitivity. Understanding superpave mix design superpave, superior performing asphalt pavements, is presented as the mix design system for the next century. 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. 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. Cominsky university of texas at austin with contributions by. The change involved a switch from the old hveem design method to the superpave design method. Properties considered in mix design superpave mix design. Superpave asphalt technology center for transportation. Trbs national cooperative highway research program nchrp report 567. 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. Then, mixture samples are prepared and laboratory test results are compared to design criteria. 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.
Superpave in 1998, the mainedot changed its method of designing hot mix for maine roads. Its pretty much as i expected its the manual for how to design a pavement using superpave. Mar 20, 20 the objective of this module is to walk through each of the steps associated with the development of a superpave mix design. Adaptation of superpave asphalt concrete mix design. The superpave mix design manual for new construction and. 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. Materials selection binder the design process starts with material selection.
Superpave mixes are designated as being level 1, 2, or 3. Superpave is a system which is inclusive of all these parts. Superpave versus marshall method of mix design marshall method, despite its shortcomings, is still probably the most widely used mix design method in the world. One thing i had been wondering prior to purchase was, is there a difference between sp1 and sp2. This is the second of two articles on the history of mix design. 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 first article covering the early design practices through the marshall and hveem systems was published in the spring 20 issue of asphalt magazine. Regarding mix design software, many state dots have their own required software to be. Mix selection superpave uses a volumetric approach to mix design. The superpave asphalt technology program is currently engaged in several important projects that extend its leadership position in superpave research and implementation. Aggregate sizes of the mix design should be checked prior to use in thinner lifts. The compaction devices from the hveem and marshall procedures have been replaced by a. The superpave gyratory method of laboratory compaction is also shown.
Harrigan strategic highway research program ronald j. Major steps in superpave nselection of materials, nselection of a design aggregate structure, nselection of the design binder content,and nevaluation of moisture sensitivity of the design mixture. The objective of this module is to walk through each of the steps associated with the development of a superpave mix design. The product of the shrp asphalt research program thomas w.
Superpave gyratory mix design discussion in 1987, the strategic highway research program shrp began developing a new system for specifying asphaltic materials. Block 14 superpave mix design linkedin slideshare. The dmf is defined as the laboratory determination of the precise proportions of asphalt binder, additives and aggregates to be blended together to meet the specified properties for a given asphalt concrete mix. Pdf comparison of marshall and superpave asphalt design. Louis county 600kb utilization of torture tests as an addendum to the superpave mix design system 321kb a westrack analysis 6. 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. Design traffic level million esals2 coarse aggregate angularity. The mix design, which takes all these technical requirements into account, ensures an optimum blend of the correct aggregates. The superpave regional centers are a unique source of expertise and assistance for highway agencies in their quest to build better, longer lasting roads. Mix design procedures for superpave mi xes that contai n rap shal l be i n acco rdance w ith the recommendati ons i n. First, design compaction levels are established and materials are selected and characterized. Kennedy university of texas at austin michael anderson the asphalt institute strategic highway research program national research council washington, dc 1994. 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.
Practice for superpave volumetric design for hot mix asphalt hma aashto r 35 glossary air voids va the total volume of the small pockets of air between the coated aggregate particles throughout a compacted paving mixture, expressed as percent of the bulk volume of the compacted paving mixture. Significant projects include research on toner modified asphalt, the effect of crushed aggregate percent on performance of hma mixtures, the correlation of field performance to. Batch, mix, and compact more samples with this gradation with four asphalt contents. Using superpave mix designs, contractors can produce. Superpave the california department of transportation caltrans has announced its intention to move in the direction of the national superpave standard for asphalt pavement mix design and testing. This method may be used with laboratoryprepared specimens, as in the mix design process, or with plantmixed material during construction. 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. The final product of the shrp asphalt research program is a new system called superpave, which is short for superior performing asphalt pavements.
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