Superpave mix design 48 determining the design asphalt content the selected trial blend becomes the design aggregate structure. Hot mix asphalt materials, mixture design, and construction. Then, mixture samples are prepared and laboratory test results are compared to design criteria. 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 rock provides the skeleton and the asphalt provides the glue or muscles to hold the skeleton together. Based on the volumetric characteristics and apa testing results of each mix, the effects of the rz and faa on. The mm designation relates to the nominal maximum size of the aggregate not the layer. Mar 20, 20 in the mix design process, as asphalt binder content is selected that will provide four 4 percent air voids when the mix is compacted to n design gyrations. The volumetric analysis common to the hveem and marshall methods provides the basis for the superpave mix design method. This might explain the causes behind the bleeding asphalt concrete surfaces and some of the distresses common in the local asphalt structures. Project file job mix formula procedures 415 job mix formula numbering system 417 superpave mix type designations 418 superpave jmf example 419 asphalt mix design and testing calculation formulas 420 thru 422 section 5. All towns should require a state approved mix design for its hot mix pavements. Hot mix asphalt mix design in simplest terms, hot mix asphalt hma is nothing more than a combination of rocks and asphalt.
Block 14 superpave mix design linkedin slideshare. Newcomb university of minnesota department of civil engineering 500 pillsbury dr. The superpave mix design manual for new construction and overlays ronald j. Also, some of the testing results are in english units and some. Kennedy university of texas at austin michael anderson the asphalt institute strategic highway research program national research council washington, dc 1994. In the mix design process, as asphalt binder content is selected that will provide four 4 percent air voids when the mix is compacted to n design gyrations. The superpave gyratory method of laboratory compaction is also shown. 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. Superpave mix design procedure recommended, for the local environmental and loading conditions, lower asphalt content than that predicted by marshall mix design procedure. There are many mix design methods that are used throughout the world, e. Compacted samples of the superpave mix are used to determine the volumetric and mechanical properties during the mix design phase and for quality controlquality assurance during construction. However, the existing superpave design system does not properly address perform.
Cominsky university of texas at austin with contributions by. Mix design procedures and tests shall be in accordance with aashto r 35 except as noted below. While this mix design procedure has performed well for airfield and highway pavements for over 50 years there is a need to adopt the new superpave mix design procedure for airfield construction. The skeleton must carry the weight while the muscles must be strong enough to hold the skeleton in place but. Restrictedzone requirements for superpave mixes made with.
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. In mix design testing and analysis, density of the compacted specimen is usually expressed in pounds per cubic foot lbft3. Density allows us to convert from units of weight to volume. Sp 23 pdf knowledge is such a treasure which cannot be stolen. Construction project, all hot mix asphalt hma bituminous. Aggregate sizes of the mix design should be checked prior to use in thinner lifts. Process has been referred to as a balanced mix design approach. A superpave asphalt mix design laboratory must have the necessary equipment, manuals and reporting procedures in accordance with current ministry of transportation of ontario laboratory testing manual ls, aashto mp, m, r, t and astm c, d, e methods. National pavement implementation executive task group pietg highlighted bmd as needed focus area balanced mix design task force development history shrp2 peer to peer exchange 2016. 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.
Performance evaluation of superpave and marshall asphalt mix. The comparison concentrated on the resistance to rutting and lowtemperature cracking of asphalt mixes prepared using the two design methods. Mix properties are required to be measured in volumetric terms as well as weight. Using rap in the superpave mix design system mike anderson, asphalt institute cupga 2005. The design aggregate structure, when blended at the optimum asphalt binder content, should yield acceptable volumetric properties based on the established criteria. Get your kindle here, or download a free kindle reading app. Although not exact matches, the old designation of a d mix is similar to a 9. Properties considered in mix design superpave mix design method.
The primary features of marshall mix design are a densityvoids analysis and the stabilityflow test. Initial mix design details3 mix design changes and challenges construction issues performance todate a short note on units is warranted. Asphalt institute ms2 7th edition 2014 asphalt mix design methods ingilizce orijinal. Refinements to the concepts of asphalt mix design procedures came about not only with. 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. Trbs national cooperative highway research program nchrp report 567. Trbs national cooperative highway research program nchrp report 573. Effective asphalt content is asphalt on surface of aggregate asphalt not absorbed by aggregate 52 superpave mix design. Pdf implementation of superpave mix design for airfield. Volumetric requirements for superpave mix design the national. However, the projects and associated plans were done with english units. The new superpave volumetric mix design software, known as superpave software version 2. The objective of this study was to compare the superpave mix design to the marshall mix design on a typical aggregate source in wyoming.
A superpave mix design includes several processes and decision points. Questions and answers related to the smart snacks interim. In phase 2, specimens for apa performance testing are fabricated, and resulting performance data are analyzed. These volumetric properties are then evaluated to select a mix design or to control the mixture quality during production. One of the principal results from the strategic highway research program shrp was the superpave mix design method. The superpave mix design method was designed to replace the hveem and marshall methods. 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 study also confirmed that overlay construction with a high tack coat application rate may result in bond failure at the hma interface. Download a pdf of volumetric requirements for superpave mix design by the national academies of sciences, engineering, and medicine for free. Table by the national academies of sciences, engineering, and medicine for free. Choosing the right asphalt mix for the right road clark morrison pavement management unit. The software, which runs under the windows 95 and the windows nt operating systems, allows users to design asphalt mixes in conformance with the superpave mix design procedures. Selection of the design aggregate structure design blend consists of determining the aggregate stockpile proportions and corresponding combined gradations of the mix design.
Demonstration of new asphalt pavements 2000 this video is unavailable. All abbreviations and acronyms in the mix design sheets are those used in bres 1992 method. 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. N maximum is the number of gyrations required to produce a density which some safety factor to ensure that the mixture does not densify too much resulting in low inplace voids thus. The superpave mix design manual for new construction and. Superpave level one mix design at the local government level final report prepared by. Nov 12, 2014 marshall mix design the basic concepts of the marshall mix design method were originally developed by bruce marshall of the mississippi highway department around 1939 and then refined by the us army. Volumetric requirements for superpave mix design the. A full superpave mix design example is presented, including discussions of the design aggregate structure, mixture volumetrics, the superpave gyratory compactor, and the selection of the design compaction level. The superpave mix design list window displays superpave mix designs for selected effective dates, approved dates, material codes, and producersupplier codes. Traditional mix design methods are established to determine the optimum asphalt content that would perform satisfactorily, particularly with respect to stability and durability.
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