The mix design technology certification mdt course provides advanced technicians, designers, and engineers responsible for mix designs with a thorough understanding of the properties of the materials which compose asphalt mixtures, as well as the physical and mathematical processes involved in producing a successful asphalt mixture design. Prepare g of mix, cool at room temp for 24 2 hrs bring oil bath to between 325 and 350of obtain a 200 g representative sample of the mix fill 2000 ml beaker about halfway with distilled water and heat to boiling add mix sample to beaker, maintain boil for 10 m 30 s remove beaker and skim asphalt from water surface. This is generally accomplished by adding some type of additive to the liquid asphalt to change its viscosity or act as a lubricant at various temperature ranges. Current superpave asphalt mix design method consists of five stages. Superpave is a performancerelated asphalt binder and mixture specification. Mack, deputy chief engineer, new york state dot retired, whose energies and commitment have long served the trb superpave committee. Asphalt institute regional engineer tuttle, oklahoma asphalt materials, mix designs, and plants. Superpave in 1998, the mainedot changed its method of designing hot mix for maine roads.
Superpave system versus marshall design procedure for asphalt. Kennedy university of texas at austin michael anderson the asphalt institute strategic highway research program national research council washington, dc 1994. Mix design technology certification asphalt institute. Superpave is an asphalt mix design method that has its roots in a report released back in 1984 by the transportation research board trb, americas highways, accelerating the search for. In different sections of the state it may also be referred to as bituminous concrete, hot plant mix, asphalt concrete, blacktop or superpave. Superpave is not just a computer software package, nor just a binder specification, nor just a mixture design and analysis tool. Using rap in the superpave mix design system mike anderson, asphalt institute cupga 2005 victoria, bc november 6, 2005. The key aspect to the performance of any asphalt mixture is the selection of the optimum materials that will be used in the mixture.
Ncdot mix design procedures 46 the job mix formula 48 superpave aggregate gradation criteria table 6102 48 superpave mix design criteria table 6103 49 superpave applicable virgin asphalt grades table 6104 49 ncdot master job mix formula procedures 49 composition of recycled mixtures jmf 410. 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. Welcome to the asphalt institute ebook site where we offer content in the latest ebook formats. Asphalt rubber applications asphalt rubber is the process of adding recycled, crumb rubber to hot mix asphalt called dry process or the asphalt binder called wet process to modify the final mixture difficult to use in densegraded mixtures due to residual crumb rubber best used in gapgraded type mixtures sma and ogfc. Its pretty much as i expected its the manual for how to design a pavement using superpave. In different sections of the state it may also be referred to as bituminous concrete, hot.
Nov 12, 2014 the superpave mix design system integrates material selection and mix design into procedures. Superpave system versus marshall design procedure for. The final product of the shrp asphalt research program is a new system called superpave, which is short for superior performing asphalt pavements. One thing i had been wondering prior to purchase was, is there a difference between sp1 and sp2. Including the vfa requirement in a mix design helps prevent the design of hma with marginally acceptable vma. Mix design in hot mix asphalt, binder and aggregate are blended together in precise proportions. The superpave system consists of three interrelated elements.
The compaction devices from the hveem and marshall procedures have been replaced by a gyratory compactor and the compaction effort in mix design is tied to expected traffic. The superpave mix design system integrates material selection and mix design into procedures. The sgc can provide information about the compactability of the particular mixture by capturing data. New superpave asphalt mix design method considering. 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. Jasim alqadisiya journal for engineering sciences, vol. The superpave mix design manual for new construction and. Superpave mix design and gyratory compaction levels.
The superpave mix design window has a copy function located under services on the description folder tab. Superpave mix design system integrates material selection asphalt and aggregates and mix design into procedures based on projects structural section, climate and design traffic. Description construct a hotmix asphalt hma pavement layer composed of a compacted, superpave sp mixture of aggregate and asphalt binder mixed hot. Superpavemix design was first introduced in 1993 with. 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. 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. The superpave mix design manual for new construction and overlays ronald j. The binder content can be adjusted by adjusting the ndes level. Pdf comparison of marshall and superpave asphalt design. Hma is composed of aggregate bound together into a solid mass by asphalt cement. Superpave mixtures advantages can be used on medium to high volume roadways.
History of design air voids national asphalt pavement. Comparison of marshall and superpave asphalt design methods for sudan pavement mixes. The superpave mix design manual for new construction and overlays. Properties considered in mix design superpave mix design. Superpave gyratory mix design discussion in 1987, the strategic highway research program shrp began developing a new system for specifying asphaltic materials.
Form 1855 superpave bituminous mix design communication. 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. Mack, deputy chief engineer, new york state dot retired, whose energies and commitment have long served the trb superpave. Superpave overview nthe final product of the shrp asphalt program area is superpave. Properties considered in mix design superpave mix design method. The change involved a switch from the old hveem design method to the. Superpave is a system which is inclusive of all these parts. The department has established procedures for the design and control of hotmix asphalt hma based on the superpave asphalt mixture design and analysis system. The sgc can provide information about the compactability of the particular. The superpave system ties asphalt binder and aggregate selection into the mix design process, and considers traffic and climate as well. Superpave mix design was used to prepare modified and unmodified ac mixtures by optimizing their volumetric properties. Understanding superpave mix design federal highway administration 1995 video vh353 superpave, superior performing asphalt pavements, is presented as the mix. Superpave is an asphalt mix design method that has its roots in a report released back in 1984 by the transportation research board trb, americas highways, accelerating the search for innovation.
Superpave mix design may also be downloaded for a specific contract. This newdesign system was not an evolution in mix design but a revolution. Superpave this workshop is intended to demonstrate the superpave asphalt mixture design system developed by the strategic highway research program shrp, along with the. Cominsky university of texas at austin with contributions by. Under the guidance of the trb superpave committee and the expert task group on communications, the report was drafted by neil f. Ncdot mix design procedures 46 the job mix formula 48 superpave aggregate gradation criteria table 6102 48 superpave mix design criteria table 6103 49 superpave. Hot mix asphalt may be referred to by several names. National asphalt pavement associations superpave construction guidelines. Vfa is expressed as a percentage of the vma that contains binder. Hotmix asphalt hma may be referred to by several names. The key aspect to the performance of any asphalt mixture is the selection of. The dmf is defined as the laboratory determination of the precise proportions of asphalt binder, additives and aggregates to be blended together to meet. 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. Particular attention has also been paid to the realworld process of asphalt mixture mix ing.
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. Payment adjustments will apply to hma placed under this specification unless the hma is deemed exempt in accordance with section 344. Batch, mix, and compact more samples with this gradation with four asphalt contents. One of the key components of superpave is materials selection. The mix design technology certification mdt course provides advanced technicians, designers, and engineers responsible for mix designs with a thorough. Voids filled with asphalt vfa are the void spaces that exist between the aggregate particles in the compacted paving hma that are filled with binder. The relative proportions of these materials determine the physical properties of the hma and. Superpave volumetric mix design and a suggested process to evaluate effects of changes to the gyration levels.
Mixture design requirements master gradation limits. Chapter 2a design and control of hotmix asphalt hma. The mix design effort showed that it was difficult to achieve the superpave volumetric requirements of voids in mineral aggregate vma and voids filled with asphalt at 4 percent air. The quality of asphalt concrete in flexible pavements plays a major role in the performance and durability of these pavements.
The report outlined the need for increased state and federal funds to develop badly needed research for better and longer. Coldmix asphalt testing worksheets t410coldmix asp coating testd24890811. Asphalt rubber applications asphalt rubber is the process of adding recycled, crumb rubber to hot mix asphalt called dry process or the asphalt binder called wet process to modify the. This method may be used with laboratoryprepared specimens, as in the mix design process, or with plantmixed material during construction. Within the superpave mix design system there are mix design criteria for 9.
Hot mix asphalt hma may be referred to by several names. Superpave mix design is a structured approach consisting of. If you prefer to purchase your title in print please visit our main site at. This text will explain the method of compacting samples of the superpave mix using the superpave gyratory compactor and determining their percent compaction. Materials selection binder the design process starts with material selection. Two empirical mix designs methods are traditionally used. Hot mix asphalt is composed of aggregate bound together. 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. In different sections of the state it may also be referred to as bituminous concrete,hot plant mix, asphalt concrete, blacktop or superpave. Superpavemix design was first introduced in 1993 with the completion of the strategic highway research program shrp. Superpave mix design 48 determining the design asphalt content the selected trial blend becomes the design aggregate structure.
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