General scope the department has established procedures for the design and control of bituminous concrete based on marshall method for more. Chapter 11 marshall method of asphaltconcrete mix 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 difficult to use in densegraded mixtures due to residual crumb rubber best used in gapgraded type mixtures sma and ogfc. Stonemontqc aggregate and asphalt capabilities are completely integrated thus allowing mix component properties to be easily updated or substituted from aggregate plants. Asphaltic concrete asphaltic concrete is a mixture of coarse aggregate fine aggregate. Since the late 1990s, the department has established a goal of implementing a newer mix design method, referred to as superpave. 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 is expressed as a percentage of the vma that contains binder. Sample asphalt binder contents based on the results of the optimum asphalt binder content estimate, samples are typically prepared at 0. General scope the department has established procedures for the design and control of bituminous concrete based on marshall method for more than 30 years. The mix design wetmix determines the optimum bitumen content. Basic mix design philosophy asphalt binder content as much asphalt as possible for durability fatigue resistance. Designing concrete mixtures there are three phases in the development of a concrete mixture. The purpose of this document is to establish an acceptance procedure for.
Mix type selection pavement type selection processes are used by pavement authorities such as state highway agencies to identify the most beneficial type of pavement structure for a given set of traffic, soils, climate, and other factors. Some types of bituminous mixes are also used in base coarse. In different sections of the state it may also be referred to as bituminous concrete,hot plant mix, asphalt concrete, blacktop or superpave. Equations for the above calculations follow in this text and their application may be expedited by use of the appropriate worksheet figure 1. Pavement surface evaluation and rating paser manuals asphalt paser manual, 2002, 28 pp. Contractor forms qc 67503020a asphalt roadway daily report of quality control automated required on projects let july 2015 and after 70001099 cross slope measurement data form automated. 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. Conduct tests on mixtures of aggregate and asphalt using marshall. Anagnos, provides an evaluation and mixture design procedure that.
Asphalt pavement thickness and mix design asphalt institute. The pennsylvania asphalt pavement association is proud. The mix design and job mix formula target values must be within the design criteria for the particular type of asphalt mixture specified. Hot mix asphalt is composed of aggregate bound together. 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. A new asphalt mix design shall be subject to the following procedure. 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. Fdot forms vt 67503021 asphalt roadway verification report. A demonstration of stone matrix asphalt mix designs using high polish value crushed stone introduction historically, the fort worth district has used either lightweight aggregate or a. This recommended mixture, which also includes aggregate gradation and asphalt binder type is often referred to as the job mix formula jmf or recipe. Including the vfa requirement in a mix design helps prevent the design of hma with marginally acceptable vma. Calculate the bearing capacity for each asphalt content. Esal is a concept developed from data collected at the american association of state highway officials aasho road test to establish. Examples of natural asphalt include the binder in rock asphalt and trinidad lake asphalt.
Improved aggregate tests are needed, especially for properties like shape and texture. Asphalt qms manual 04 asphalt mix design and job mix. Asphalt mix designs submitted to the tdot must exhibit certain physical performance properties indicated in standard specifications including but. Hma pavement mix types include opengraded friction. Asphalt pavement thickness and mix design while there are an infinite number of questions that can be asked, we compiled a list of those questions that have been directed to us the most. Obtain this information from the contractor and submit on the concrete mix design request form 2416.
There was also another most economical mix design spreadsheet, which is capable of finding the most economical mix design for achieving a particular. Aggregate base qualification procedure form example. The relative proportions of these materials determine the physical properties of the hma and ultimately how the hma performs as a. Submittal and approval of hot mix asphalt mix designs sop. The contractor may submit a new job mix formula on form cem3511 with a new form cem3512, contractor hot mix asphalt design data, or the contractor may adjust the job mix formula on form. The end result of a successful mix design is a recommended mixture of aggregate and asphalt binder. The marshall mix design method can use any suitable method for estimating optimum asphalt content and usually relies on local procedures or experience. Conduct tests on mixtures of aggregate and asphalt using marshall apparatus as described in kansas test method kt14, and plot the resulting data on kdot form no. Hotmix asphalt hma is a generic term that includes many different types of mixtures of aggregate and. The manual is a practical guide based on proven technologies. 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. 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. The contractor establishes the initial parameters for a mix design and serves as the starting point for subsequent.
The initial step in proportioning the mix design is to calculate the water content per cubic yard of concrete. An example of proportioning a mix design through use of this form is detailed in table 3. Asphalt facts links hotmix asphalt pavement design guide. Is each sample submitted accompanied by a sample identification form 1923. Marshall method of mix design is the most popular one and is discussed. Properties considered in mix design superpave mix design. Upon receipt of form 2416 from the engineer, the mndot concrete engineering unit issues estimated composition of concrete mixes form. Stonemontqc includes powerful asphalt mix design and quality control features for asphalt producers. The 7 th edition of ms2 asphalt mix design methods marks the 56 th year of continuous publication of an asphalt institute mix design manual. Design fundamentals 101 hma consists of two basic ingredients. The contractor may submit a new job mix formula on form cem3511 with a new form cem3512, contractor hot mix asphalt design data, or the contractor may adjust the job mix formula on form cem3511 with allowable adjustments specified in section 392. Hot mix asphalt may be referred to by several names. 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.
August 2016 film thickness summary sheet summary grad chart. Asphalt mix design and quality control software management system. A mix design will be registered if the requirements of mrts30 asphalt. Asphalt institute developed a mix design procedure mainly for fine. Bulk specific gravity of compacted paving mixture sample. There are many methods available for mix design which vary in the size of the test specimen, compaction, and other test specifications. 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. Chapter 2 design and control of bituminous mixtures using. The pavement mix types targeted are ogfc, sma, and fineand coarsegraded dense mixes. Aggregate sizes of the mix design should be checked prior to use in thinner lifts.
Recombine aggregates to form further trial blends i. Mix design spreadsheet download computerized civil engineer. Practical approaches to hotmix asphalt mix design and production. Hma design is the process of determining what aggregate to use, what asphalt binder to use and what the optimum combination of these two ingredients ought to be. A demonstration of stone matrix asphalt mix designs using high polish value crushed stone introduction historically, the fort worth district has used either lightweight aggregate or a crushed gravel from reeves county, texas, when a polish value of 3s minimum was required for a hot mix. The purpose of this guidance note is to ensure that a standardized method is applied to the design procedure. These faqs are categorized into subject areas listed in the contents dropdown box below. Asphalt institute ms2 7th edition 2014 asphalt mix design methods ingilizce orijinal. Esal is the acronym for equivalent single axle load. Mix type selection pavement type selection processes are used by pavement authorities such as state highway agencies to identify the most beneficial type of.
Polishing polishing is a smooth slippery surface caused by traffic wearing off sharp edges of aggregates. In this spreadsheet, i have added another sheet report1. This is preceded by the dry mix design discussed in the previous chapter. The mix is composed usually of aggregate and asphalt cements. The mix design and job mix formula target values must be within. Asphalt institute regional engineer tuttle, oklahoma asphalt materials, mix designs, and plants. 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. Upon receipt of form 2416 from the engineer, the mndot concrete engineering unit issues estimated composition of concrete mixes form 2406. Chapter 2 design and control of bituminous mixtures using a. The contractor establishes the initial parameters for a mix design and serves as the starting point for subsequent proportioning calculations. Conduct tests on mixtures of aggregate and asphalt using marshall apparatus as described in kansas test method kt14, and plot the resulting data on kdot form. Download the hot mix asphalt pavement deisgn guide pdf bituminous plant map. Esal is a concept developed from data collected at the american association of state highway officials aasho road test to establish a damage relationship for comparing the effects of axles carrying different loads.
Calculate the limiting asphalt content at the tentative design asphalt content. Hma mix design strength stability rut resistance raveling durability crack resistance shoving flushing. Mixture design procedure for recycled asphalt pavements. Due to recent changes, the production facilities that had the oversight of the city of north las vegas will now be covered by city of las vegas. Repair by blotting with sand or by overlaying with properly designed asphalt mix. Flushing is excess asphalt on the surface caused by a poor initial asphalt mix design or by paving or sealcoating over a flushed surface. Once the asphalt design engineer has evaluated andor confirmed the data, the mix design will be approved if it meets specifications. Required test procedures for aggregate and hot mix asphalt hma are shown in table. This test method is for use with mixtures containing. 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. Ability of a bituminous mix to bend repeatedly with out cracking and to conform to changes in shape of the base course.
Basic mix design philosophy asphalt binder content as much asphalt as possible for durability. This recommended mixture, which also includes aggregate gradation and asphalt binder type is. Properties considered in mix design superpave mix design method. The purpose of this document is to establish an acceptance procedure for hot mix asphalt mix designs.