Trbs national cooperative highway research program nchrp report 673. Cdotdtdr200212 prepared by colorado department of transportation research branch sponsored by the colorado department of transportation in cooperation with the u. Equations for the above calculations follow in this text and their application may be expedited by use of the appropriate worksheet figure 1. Ensure that you collect enough material for section 5. When a sample of asphalt mixture is prepared in the laboratory, the asphalt. Based on the results of the optimum asphalt binder content estimate, samples are typically prepared at 0. An asphalt rubber hot mix asphalt arhma design was created using a superpave 12. Procedures for sampling asphalt mixturesdensity cores and.
Hotmix asphalt mixture design verification procedure. Sma 5 types ac 8 types pa 3 types ma 6 types ac 4 types ac 9 types typical g rading. Pres 6 pushing the envelope for 100 years tunneling under the chesapeake bay the parallel thimble shoal. The program is successfully verified with an example. This test method does not purport to address all of the safety. Rutting and fatigue performance tests asphalt pavement.
There is no plan to update either software package. See the recommended thickness design software section below for current and robust alternatives to sw1. Much of what determines long term pavement performance of. Asphalt mix design plant assignment sheets mac mix design recovery data. The superpave mix design manual for new construction and overlays ronald j. The sample is heated in a furnace at 538c f or less. Method b this method samples the asphalt mixture from behind the paver using a. Calibration kit includes a dummy sample that is precision milled to a. Asphalt mix design australian asphalt pavement association 2012 1 asphalt mix design 1 introduction these notes provide an outline of the process of asphalt mix design and are substantially based on. For maintenance, an important caveat is that fine material such as silt or sand must be prevented from clogging. In the marshall test method of mix design, three compacted samples are. Batch, mix, and compact more samples with this gradation with four asphalt contents.
The main objective of the job mix formula, mix design method, marshall mix design method is to determine an ideal and optimum asphalt mix that has following properties. An example of the difference between weight and volume of asphalt mixture is given in figure 41. This procedure covers the determination of asphalt binder content of hot mix asphalt hma by ignition of the binder in accordance with aashto t 30810. Properties considered in mix design superpave mix design. Pdf asphalt mix design optimization for efficient plant management.
Standard procedure to verify that plant produced hot mix asphalt will meet mix design requirements. This test method is for use with mixtures containing penetration and viscosity or performance grade asphalt cements and aggregate up to 25 mm maximum size. 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. Historical mix design methods marshall hveem new superpave gyratory. Overview the sample is heated in a furnace at 538c f or less. Superpave mix design method the superpave mix design method is a volumetric mix design process. Asphalt mix samples obtained from the plant or from the pavement before compaction may be sent in loose. Kennedy university of texas at austin michael anderson the asphalt. Sampling location impact on measured asphalt content of hot mix asphalt by mohammad abuhassan university of colorado at denver report no. Rutting and fatigue performance tests ramon bonaquist, ph. Bulk specific gravity the ratio of the mass, in air, of a volume of aggregate gsa or. The purpose of this guidance note is to ensure that a standardized method is applied to the design procedure. Concrete pavement analyst cpa setting the record straight pdf 605kb.
Description construct a hot mix asphalt hma pavement layer composed of a compacted, densegraded mixture of aggregate and asphalt binder mixed hot in a mixing plant. Mix design objectives sufficient asphalt to ensure a durable pavement. Aggregate including mineral fillercollected dust dried, split into the individual sizes specified for the batching worksheet as stated in the current hotmix asphalt level iii technician course manual, and then. Relative compaction is the ratio, expressed as a percentage, of the inplace dry density to. Flow number for hot mix asphalt hma using the asphalt mixture performance tester ampt. Available below as downloadable pdf files are individual documents for each of the 50 state highway agencies which summarize their respective asphalt emulsion specifications. For additional information on asphalt and asphalt paving materials, refer to the asphalt. Batch, mix, and compact more samples with this gradation with four asphalt. Vfa is expressed as a percentage of the vma that contains binder.
Skid resistance 43 impermeability 43 low temperatureshrinkage cracking 43 workability 43 economics 43 the mix design process 43 aggregate properties and gradation requirements 43 asphalt. Including the vfa requirement in a mix design helps prevent the design of hma with marginally acceptable vma. Chapter 2 design and control of bituminous mixtures using. The main effect of the vfa is to limit maximum levels of vma and subsequently maximum levels of binder content. Hma mix design strength stability rut resistance raveling durability crack resistance shoving flushing. 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. The pavement mix types targeted are ogfc, sma, and fineand coarsegraded dense mixes. Asphaltic concrete asphaltic concrete is a mixture of coarse aggregate fine aggregate mineral filler and bitumen. Asphalt mix design manual for south africa, provisional working document november 2014. The intent of the asphalt mix design registration process is to ensure asphalt mixes are designed and can be produced by a particular manufacturing plant to comply with the requirements of the relevant asphalt specification. Refinements to the concepts of asphalt mix design procedures came about not only with.
Materials division business virginia department of. Note 9when using warm mix asphalt wma additives in the mixture design. Vma is the volumetric void space created by the aggregate particles in an asphalt mixture. Our integrated software product for aggregate, asphalt, and concrete. Download pdf asphalt concrete mix design book full free. Special provisions and standard specifications to verify that each provision is included in the mix design. The primary features of marshall mix design are a densityvoids analysis and the stabilityflow test. The purpose of this chapter is to present the street structural design criteria required for use on all streets in the larimer county gma. After logging in, users can create a new mix design, share, remove, or copy an existing mix design, or download the user manual by clicking on the corresponding buttons.
Asphalt concrete mix design and construction asphalt concrete mix design and construction hot mix asphalt concrete hma mix designs objective. Note 14a butter batch mix is a trial batch of asphalt and aggregate design. 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. If it is desired to use 12% rap, the asphalt content can be interpolated from the design values at l0 and 15% rap. At this point in time, asphalt rubber has only been used with hma that contains a more open graded nature, such as open graded friction course ogfc. How superpave works asphalt pavement has two basic components. Verification of design properties on samples of manufactured asphalt. Volumetric analysis of hma mixtures 31 example problem lets assume we have a compacted hma mixture with the following properties. Payment adjustments will apply to hma placed under this specification unless the hma is deemed exempt in accordance with section 3076. Reducing samples of asphalt mixtures to testing size. Our integrated software product for aggregate, asphalt, and concrete is used at over 3500 plants in north america. Volumetric mix design volumetric mix design page 3 of a rdot mix design 55 a rdot special tests tests required at the start of production for a new mix design and in the event of a 120 day or more interruption in mix. Marshall mix design select and test aggregate select and test asphalt cement establish mixing and compaction temperatures develop trial blends heat and mix asphalt cement and aggregates compact specimen 102 mm diameter bit. Asphalt laboratory florida department of transportation.
Ms2, sixth edition mix design methods for asphalt concrete and other hot mix types. Cold mix asphalt concrete cold mix asphalt concrete, or cold placed mixture, is generally a mix made with emulsi. The superpave mix design manual for new construction and. We offer desktop, server, enterprise, and hosted editions that easily scale from the single plant operator to the largest producers. I have done following changes in mix design spreadsheet for the mistakes reported. Asphaltic concrete mix design apwa type 401 objective perform a marshall mix design per the asphalt institute ms2 manual and aashto test methods conforming to the kansas city metropolitan. Assignments asphalt mix design plant assignment sheets mac. Bulk specific gravity of compacted paving mixture sample. Examples include coarse continuously graded asphalt, stone mastic. The superpave mix design manual for new construction and overlays.
Asphalt institute regional engineer tuttle, oklahoma asphalt materials, mix designs, and plants. Asphalt institute ms2 7th edition 2014 asphalt mix design methods ingilizce orijinal. The representative samples shall be identified and submitted as follows. 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. Calculate the limiting asphalt content at the tentative design asphalt content. Intensive laboratory testing program was conducted on samples of both mixes prepared at the design asphalt contents and aggregate.
Guide the recruiter to the conclusion that you are the best candidate for the asphalt plant operator job. The marshall stability of the mix design is defined as a maximum load carried by a compacted specimen at a standard temperature of 60 oc. Vfa also restricts the allowable air void content for asphalt mixtures that are near the minimum vma criteria. Develop an economical blend of aggregates and asphalt. Aashto pp28, practice for superpave volumetric design for hot mix.
Ppt asphalt concrete mix design powerpoint presentation. Note 9when using warm mix asphalt wma additives in the mixture design, verify. Pres 4 where the west virginia doh is at with mass concrete. Asphalt concrete mix design available for download and read online in other formats. Pdf asphalt concrete mix design download full pdf book. Marshall mix design method for asphaltic concrete asphalt rubber arac an arizona method 1. Component diagram of compacted sample of hot mix asphalt bulk specific gravity or density the density of the compacted mix. Hot mix asphalt concrete hma mix designs objective.
Asphaltic concrete mix design apwa type 401 objective perform a marshall mix design per the asphalt institute ms2 manual and aashto test methods conforming to the kansas city metropolitan chapter of the american public works association, 2001 edition, apwa type 401 specification 50 compaction blows per face. Mix design methods for asphalt concrete and other hot. Superpave provides pavement engineers with a method for selecting materials and designing the asphalt concrete mix. Hot mix asphalt may be referred to by several names. Pdf the role of aggregate gradation in hotmix asphalt performance is well documented in the. Asphalt mix design manual for south africa, provisional working document november 2014 preface the purpose of this sabita manual is to establish a common base for the design of asphalt mixes in.
Stonemont solutions develops quality control, plant flow modeling, and mix design software for the construction materials industry. A manual for design of hot mix asphalt with commentary incorporates the many advances in materials characterization and hot mix asphalt hma mix design. Cahill associates has been involved in the design and construction of more than 200 porous asphalt pavements since the 1980s and have reported no failures of pavements for which proper design and construction practices were followed. Cominsky university of texas at austin with contributions by. Design serving the needs of liquid asphalt manufacturers and suppliers worldwide since 1919. If the contractor proposes to use a previously used mix design, samples do not need to be. Mix design in asphalt mixture, binder and aggregate are blended together in precise proportions.
The final mix design should be workable and contain the most suitable gradation and amount of asphalt binder to produce a mix. Asphalt mix design manual for south africa, provisional working document november 2014 asphalt mix design manual for south africa. 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. This emulsion specification database was developed by the asphalt institute. Mix design in hot mix asphalt, binder and aggregate are blended together in precise proportions. Mix design spreadsheet download computerized civil engineer. Contractor mix design guidelines for asphalt concrete january 2017 2 contractor mix design guidelines for asphalt concrete these guidelines outline the procedures to be used in developing, testing, and submitting asphalt concrete mix. The relative proportions of these materials determine the. Users cannot share, remove, or copy a mix design until one has been created. Chapter 2 design and control of bituminous mixtures using a. When a mix design is submitted, the project supervisor should have an inspector witness the contractors sampling of the aggregate stockpiles.
Adobe acrobat pdf files require the free acrobat reader software. If it is intended to vary the percentage of the rap during production, develop the recycled mix designs using rap in increments of five percentage points, such as, 10, 15, 20, 25 and 30 percent. The marshall mix design method can use any suitable method for estimating optimum asphalt content and usually relies on local procedures or experience. Properties considered in mix design superpave mix design method. General guides to the selection of mix type are found in documents such as the. The mix needs a minimum vma to have enough volume to hold the proper amount of air voids and the proper amount of binder. Section 5 preparing aggregatemineral admixture samples for mix design. State materials office bituminous asphalt laboratory. Designing and constructing sma mixtures illinois asphalt. Pdf comparison of marshall and superpave asphalt design. A mix design will be registered if the requirements of mrts30 asphalt.
Vma, vfa, g mb, g mm, pa voids, tensile strengths, tsr values, hamburg wheel, and ifit. Calculate the bearing capacity for each asphalt content. Including the vfa requirement in a mix design helps prevent the design of asphalt mixture with marginally acceptable vma. Marshall method of 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 u. Archived superpave asphalt mixture design illustrated. 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. Superpave mix design 48 determining the design asphalt content the selected trial blend becomes the design aggregate structure. Tailor your resume by picking relevant responsibilities from the examples below and then add your accomplishments.
Worlds fastest modern road construction machines amazing extreme asphalt paving machine duration. General scope the department has established procedures for the design and control of bituminous concrete based on marshall method for more than 30 years. Regarding mix design software, many state dots have their own required software to be. Engineering services for the asphalt industry beyond research flexural fatigue was specified by caltrans on i710 project mix design overlay test was specified by njdot on a couple of projects mix design and acceptance tests conducted at rutgers university continuum damage higher rap content mixtures. Marshall mix design method for asphaltic concrete an arizona method 1. Section 12 determination of design percent asphalt binder content 16 section immersion compression imc test 20. Develop an economical blend of aggregates and asphalt that meet design requirements historical mix design methods marshall hveem new superpave gyratory. Develop an economical blend of aggregates and asphalt that meet.
The hma pavement mix type selection guide provides designers with methods for selecting appropriate mix types while considering factors such as traffic, environment, subsurface pavement structure, existing pavement condition and preparation, and economics. Hotmix asphalt mixture design verification procedure appendix b. Pres 5 an introduction to low density cellular concrete and advanced foam technologies. Since the late 1990s, the department has established a goal of implementing a newer mix design method, referred to as superpave.
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