Trbs national cooperative highway research program nchrp report 567. Mix design technology certification asphalt institute. Switching binder grade on same design maybe switching binder source within same grade maybe aggregate types never aggregate sources never. The quality of asphalt concrete in flexible pavements plays a major role in the performance and durability of these pavements. This method may be used with laboratoryprepared specimens, as in the mix design process, or with plantmixed material during construction. The superpave mix design manual for new construction and overlays. Superpave mix designs for low volume roads iowa publications. Cominsky university of texas at austin with contributions by. Superpave is a system of compo nents that work together to provide a superior performing asphalt pavement. 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.
Properties considered in mix design superpave mix design method. Nchrp report 465 simple performance test for superpave. The superpave mix design method was designed to replace the hveem and marshall methods. Superpave mix design method the superpave mix design method is a volumetric mix design process. The superpave design process is part of a total pavement design system. The design will be submitted and evaluated according to the hma production manual, procedures for hma mix design processing. The superpave mix design method differs from the marshall mix design methods by using. The volumetric analysis common to the hveem and marshall methods provides the basis for the superpave mix design method. The superpave mix design window has a copy function located under services on the description folder tab. The change involved a switch from the old hveem design method to the superpave design method. This newdesign system was not an evolution in mix design but a revolution. 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.
Superpave includes some old rules of thumb and some new and mechanistic based features. Superpave volumetric mix design originally termed superpave level 1 is an improved material. Generally, this results in a paving mix which is coarser, has less sand, and less liquid asphalt. The higher the volume of traffic of the roadway, the higher the number of esals, and the higher the superpave traffic level of the mix. The relative proportions of these materials determine the physical properties of the hma and ultimately how the hma performs as a finished pavement. Federal highway administration abstract superpave is an acronym for superior performing asphalt pavements. 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. The report outlined the need for increased state and federal funds to develop badly needed research for better and longer.
Superpave mixture design provides for a functional selection, blending, and volumetric analysis of proposed materials, along with an evaluation of moisture sensitivity. These properties include air voids va, voids in mineral aggregate vma and voids filled with asphalt binder vfa, and dust to binder ratio. Although superpave is recognized as a significant system in. A superpave mix design includes several processes and decision points. Superpave volumetric mix design and a suggested process to evaluate effects of changes to the gyration levels. Nchrp report 465 simple performance test for superpave mix. Sheikh edrees, comparison of marshall and superpave asphalt design methods for sudan pavement mix es, international journal of scientific and technical advancements. Then, mixture samples are prepared and laboratory test results are compared to design criteria. Superpave mix design may also be downloaded for a specific contract. Superpave mix design system integrates material selection asphalt and aggregates and mix design into procedures based on projects structural section, climate and design traffic. 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. Level 2 uses the same volumetric mix design procedure as level 1 as a starting point, in conjunction with a battery of tests to predict the mix performance.
Within the superpave mix design system there are mix design criteria for 9. 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. Versatile mix used for a variety of applications ranging from high volume. Superpave mix design and gyratory compaction levels. Superpave provides pavement engineers with a method for selecting materials and designing the asphalt concrete mix, and establishes how to. 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. How superpave works asphalt pavement has two basic components. 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. Students will receive training over the entire range of activities related to the design of asphalt mixtures. Superpave level 1 is an improved materials selection and volumetric mix design procedure.
First, design compaction levels are established and materials are selected and characterized. Particular attention has also been paid to the realworld process of asphalt mixture mix ing. Louis county 600kb utilization of torture tests as an addendum to the superpave mix design system 321kb a westrack analysis 6. An analysis of specimens and the maximum specific gravity sample are conducted to evaluate such properties as voids in mineral aggregate vma, voids filled with asphalt vfa, air voids, and the dusteffective binder ratio. Average daily traffic adt greater than 15,000 recommended minimum lift thickness 2 9. Comparison of marshall and superpave asphalt design methods for sudan pavement mixes. The superpave regional centers are a unique source of expertise and assistance for highway agencies in their quest to build better, longer lasting roads. 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.
Superpave mixture design and analysis is performed at one of three increasingly rigorous levels, with each level providing more information about mixture performance. Superpave includes a new mixture design and analysis system based on performance characteristics of the pavement. The superpave system ties asphalt binder and aggregate selection into the mix design process, and considers traffic and climate as well. Summary volumetric requirements for superpave mix design. Superpave fundamentals illinois department of transportation. Aggregate sizes of the mix design should be checked prior to use in thinner lifts. 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. Payment adjustments will apply to hma placed under this specification unless the hma is deemed exempt in accordance with section 344. The superpave mix design manual for new construction and. Construction problems with the superpave mix included low gyratory voids in field samples and tenderness during the compaction process.
The superpave mix design system provides flexibility to deal with one, two, or all three of the major distress types which it addresses. The superpave mix design manual for new construction and overlays ronald j. Mix design in hot mix asphalt, binder and aggregate are blended together in precise proportions. This text will explain the method of compacting samples of the superpave mix using the superpave gyratory compactor and determining their percent compaction. The superpave mix design system evaluates the volumetric properties of the compacted samples. Properties considered in mix design superpave mix design. Superpave is a system which is inclusive of all these parts. Kennedy university of texas at austin michael anderson the asphalt institute strategic highway research program national research council washington, dc 1994.
Batch, mix, and compact more samples with this gradation with four asphalt contents. However, the existing superpave design system does not properly address perform. It is a multifaceted system with a tiered approach to designing asphalt mixtures based on desired performance. It is the product of the strategic highway research program.
Pdf comparison of marshall and superpave asphalt design. Volumetric requirements for superpave mix design the. One of the principal results from the strategic highway research program shrp was the superpave mix design method. Comparison between marshall and superpave mixtures design 396 alqadisiya journal for engineering sciences, vol. The hma mixture design will be provided by the contractor. Consequently, a substantial length of interstates and expressways would require a superpave traffic level 4 mix, whereas. Mix composition the rule of thumb would be to never allow a different material or different source to be used than what is on the mix design. Superpave mix design 48 determining the design asphalt content the selected trial blend becomes the design aggregate structure. Superpave mix design tests methods and requirements by john a.
The superpave mix design list window displays superpave mix designs for selected effective dates, approved dates, material codes, and producersupplier codes. The contractor may substitute reclaimed asphalt pavement rap for a portion of the new materials required to produce hma. The superpave system ties and selection into the mix design process, and considers traffic and climate as well. The superpave volumetric mix design procedure aashto mp2 and pp28 developed in the asphalt research program 19871993 of the strategic highway research program shrp does not include a simple, mechanical proof test analo. Superpave includes a new mixture design and analysis system based on performance characteristics of.
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