The superpave asphalt technology program is currently engaged in several important projects that extend its leadership position in superpave research and implementation. The first article covering the early design practices through the marshall and hveem systems was published in the spring 20 issue of asphalt magazine. Mix design procedures and tests shall be in accordance with aashto r 35 except as noted below. 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. 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. 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. A design and analysis system based on the volumetric properties of the asphalt mix. Superpave mixes are designated as being level 1, 2, or 3. Superpave asphalt technology center for transportation. This text will explain the method of compacting samples of the superpave mix using the superpave gyratory compactor and determining their percent compaction. Cominsky university of texas at austin with contributions by. Kennedy university of texas at austin michael anderson the asphalt institute strategic highway research program national research council washington, dc 1994.
Pdf comparison of marshall and superpave asphalt design. Its pretty much as i expected its the manual for how to design a pavement using superpave. 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. 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. 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. University of baroda 1 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The superpave mix design manual for new construction and. Superpave gyratory mix design discussion in 1987, the strategic highway research program shrp began developing a new system for specifying asphaltic materials. Mix analysis tests and performance prediction models. 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. Superpave mix design 48 determining the design asphalt content the selected trial blend becomes the design aggregate structure. Regarding mix design software, many state dots have their own required software to be.
One thing i had been wondering prior to purchase was, is there a difference between sp1 and sp2. Superpave is a system which is inclusive of all these parts. The superpave system ties asphalt binder and aggregate selection into the mix design process, and considers traffic and climate as well. Superpave overview nthe final product of the shrp asphalt program area is superpave.
See the recommended thickness design software section below for current and robust alternatives to sw1. The product of the shrp asphalt research program thomas w. One of the key components of superpave is materials selection. The mix design, which takes all these technical requirements into account, ensures an optimum blend of the correct aggregates. Properties considered in mix design superpave mix design. 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. This is the second of two articles on the history of mix design. The superpave gyratory method of laboratory compaction is also shown. The superpave regional centers are a unique source of expertise and assistance for highway agencies in their quest to build better, longer lasting roads. There are several properties that contribute to the quality of hma pavements.
The superpave mix design manual for new construction and overlays ronald j. Design traffic level million esals2 coarse aggregate angularity. However, the existing superpave design system does not properly address perform. Sheikh edrees, comparison of marshall and superpave asphalt design methods for sudan pavement mix es, international journal of scientific and technical advancements. Pdf superpave design aggregate structure considering. There is no plan to update either software package. Superpave in 1998, the mainedot changed its method of designing hot mix for maine roads. 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. Trbs national cooperative highway research program nchrp report 567. Adaptation of superpave asphalt concrete mix design.
History of design air voids national asphalt pavement. 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. A gyratory compactor simulates traffic conditions in the laboratory. Mix selection superpave uses a volumetric approach to mix design. Then, mixture samples are prepared and laboratory test results are compared to design criteria. If you continue browsing the site, you agree to the use of cookies on this website. Harrigan strategic highway research program ronald j. Superpave mix design was developed as part of the strategic highway research program shrp from 1987 to 1993. 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. 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. Superpave mixture design provides for a functional selection, blending, and volumetric analysis of proposed materials, along with an evaluation of moisture sensitivity. 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.
Using superpave mix designs, contractors can produce. Block 14 superpave mix design linkedin slideshare. 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 superpa ve su perior per forming asphalt pave ments design method of hot mix asphalt. Materials selection binder the design process starts with material selection. 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. 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. The mix design process should provide an hma mix that will resist permanent deformation, should provide fatigue resistance, durability and resistance to moisture damage. A superpave mix design includes several processes and decision points. This page is a repository of resources and documents related to that effort.
Refinements to the concepts of asphalt mix design procedures came about not only with. First, design compaction levels are established and materials are selected and characterized. The superpave mix design manual for new construction and overlays. The change involved a switch from the old hveem design method to the superpave design method. Understanding superpave mix design superpave, superior performing asphalt pavements, is presented as the mix design system for the next century. 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. 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. The final product of the shrp asphalt research program is a new system called superpave, which is short for superior performing asphalt pavements. Superpave, in its final form consists of three basic components.
Generally, this results in a paving mix which is coarser, has less sand, and less liquid asphalt. 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. Volumetric requirements for superpave mix design the. 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. 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. The objective of this module is to walk through each of the steps associated with the development of a superpave mix design. The compaction devices from the hveem and marshall procedures have been replaced by a. 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.
History of asphalt mix design in north america, part 2. 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. Louis county 600kb utilization of torture tests as an addendum to the superpave mix design system 321kb a westrack analysis 6. 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. Aggregate sizes of the mix design should be checked prior to use in thinner lifts. Batch, mix, and compact more samples with this gradation with four asphalt contents. The primary features of marshall mix design are a densityvoids analysis and the stabilityflow test.
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