Asphaltic concrete asphaltic concrete is a mixture of coarse aggregate fine aggregate mineral filler and bitumen well graded aggregates and mineral filler resulting in maximum density when mixed with optimum quantity of bitumen results in a mix. Calculate the limiting asphalt content at the tentative design asphalt content. Hma pavement mix type selection guide transportation. 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. Do not increase the water content beyond the tolerance allowed in specification 2461.
Concrete mix design and quality control software management system stonemontqc includes a powerful concrete mix design and quality control software program for concrete producers. The superpave mix design manual for new construction and overlays. An asphalt concrete mixture must be designed, produced and placed in order to obtain the following desirable mix properties. Mix temperature is dependent on the grade of asphalt used in the mix. Asphaltasphalt concrete mixes are designed for specific functions, characteristics, attributes, performance, location and function in the pavement structure. Section 39, asphalt concrete, of the standard specifications provides material and construction requirements for hot mix asphalt hma including. Under current specifications, many otherwise sound mix. Pdf design methods asphalt mix 7th edition ms2 asphalt. The concrete mix design is performed to ensure that the concrete mix formulation meets or exceeds the specification requirements. Less viscous the asphalt requires lower the temperatures, while more viscous asphalt requires higher temperatures. The ability of a properly proportioned asphalt paving mix to resist the potentially damaging effects of the asphalt binder stripping from the aggregate particles is also routinely evaluated in the laboratory.
Asphaltic concrete asphaltic concrete is a mixture of coarse aggregate fine aggregate mineral filler and bitumen well graded aggregates and mineral filler. The following standards of the asphalt institute are also a part of these specifications. Speight phd, dsc, in asphalt materials science and technology, 2016. The specific gravity of the asphalt binder shall be determined in accordance with aashto t 228 at 77 f. Develop an economical blend of aggregates and asphalt that meet design requirements historical mix design. This pavement design guide,prepared by the pennsylvania asphalt pavement association papa, is provided for the practitioner architect, municipal and township engineer, and developer who to some. 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. Contractor mix design guidelines for asphalt concrete january 2018 4 contractor mix design guidelines for asphalt concrete 1. Epps research report 21421 engineering, economy and energy considerations in design, construction and materials 2974214 sponsored by state department of highways and public transportation august 1980 texas transportation institute. Asphalt concrete pavements are inherently nonhomogeneous in nature and exhibit instability incompatibility. 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. Develop an economical blend of aggregates and asphalt that meet design requirements historical mix design methods marshall hveem new superpave gyratory. The mix proportions for a properly compacted asphalt concrete paving mixture are determined in the laboratory during mix design testing.
Bituminous mix design for pavement types, materials and. Sample asphalt binder contents based on the results of the optimum asphalt binder content estimate, samples are typically prepared at 0. This report documents laboratory testing and the development of a modified mix design method for asphaltic concrete surfaces for very high contact pressures of. Standard practice for determination of optimum emulsified asphalt content of cold inplace recycled mixtures acrobat, 52 kb wflhd sampling and testing methods acrobat, 3. Calculate the bearing capacity for each asphalt content. Aashto m 323 standard specification for superpave volumetric mix design. Pdf chapter 11 marshall method of asphaltconcrete mix. Mix design is a process to manipulate three variables.
The marshall mix design method can use any suitable method for estimating optimum asphalt content and usually relies on local procedures or experience. The superpave mix design manual for new construction and. Standard practice for determination of optimum emulsified asphalt content of cold inplace recycled mixtures acrobat, 52 kb wflhd sampling and testing methods acrobat. Asphalt concrete mix design and construction hot mix asphalt concrete hma mix designs. Pdf design methods asphalt mix 7th edition ms2 asphalt mix. The purpose of this guidance note is to ensure that a standardized method is applied to the design procedure. 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. Section 39, asphalt concrete, of the standard specifications provides material and construction requirements for hot mix asphalt hma including type a, rubberized hot mix asphaltgap graded rhmag, opengraded friction course ogfc, minor hma, and hot mix asphalt with warm mix asphalt wma additive technology. The bituminous concrete is a combination of aggregates that is continuously graded from the maximum size which is mainly less than 25mm to the. Aashto r 30 standard practice for mixture conditioning of hot mix asphalt hma. Well graded aggregates and mineral filler resulting. Chapter 11 marshall method of asphaltconcrete mix design. Mix design procedures aci mix design relationship between watercement ratio and compressive strength of concrete 28day compressive nonae ae strength psi 2,000 0. Stonemontqc is fully integrated with the aggregate portion allowing for mix component properties to be easily kept current with data from aggregate plants.
May 17, 2017 asphalt concrete mix design basics dragos andrei. Mar 31, 2020 hot mix asphalt mix design certification pdf hot mix asphalt study manuals. Kennedy university of texas at austin michael anderson the asphalt institute strategic highway research program national research council washington, dc 1994. Aashto t 11 standard method of test for materials finer than 75 m. It is a combination of two primary ingredients aggregates and. The pavement mix types targeted are ogfc, sma, and fineand coarsegraded dense mixes. Construction specifications for asphalt concrete, by the asphalt institute. Texas gyratory, or something else, the mix design process has some common procedures and goals. The mineral admixture used in the design shall be the same type of material to be used in production of the asphaltic concrete. Develop an economical blend of aggregates and asphalt that meet design requirements. Producing high quality hma pavement requires a good partnership between caltrans, the plant producing the hma material and the contractor placing the hma. Equations for the above calculations follow in this text and their application may be expedited by use of the appropriate worksheet figure 1.
The superpave mix design manual for new construction and overlays ronald j. This provides a layer will have acceptable levels of. Hot mix asphalt may be referred to by several names. The mix is composed usually of aggregate and asphalt cements. Asphalt concrete commonly called asphalt, blacktop, or pavement in north america, and tarmac, bitumen macadam, or rolled asphalt in the united kingdom and the republic of ireland is a composite. About hot mix asphalt construction every year, the state of california invests millions of dollars in construction of hot mixed asphalt hma, previously known as asphalt concrete ac, pavement. The bituminous concrete is a combination of aggregates that is continuously graded from the maximum size which is mainly less than 25mm to the fine filler of size smaller than 0.
Asphalt pavement thickness and mix design asphalt institute. This 2016 asphalt pavement design guide has been prepared to assist readers in understanding asphalt mix pavement design, construction, and rehabilitation. 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. Cominsky university of texas at austin with contributions by. Very little asphalt concrete less than 1 percent, according to a survey by the federal highway administration and the national asphalt pavement association conducted annually since 2009 is actually disposed of in landfills. Asphalt concrete is 100% recyclable and is the most widely reused construction material in the world. The mix design is used to establish the proper proportioning of components hydraulic cement, aggregates, water, pozzolans, and admixtures in the mixture to achieve the specified properties. Pdf laboratory optimization of asphalt concrete mixture design.
Cl2 model specifications for small paving jobs pdf 1. 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. Some types of bituminous mixes are also used in base coarse. Mix proportion design of asphalt concrete iopscience.
Chapter 11 marshall method of asphaltconcrete mix design 11. Develop an economical blend of aggregates and asphalt that meet design requirements historical mix. Out of print asphalt institute construction leaflets. 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. A laboratory study of asphalt concrete mix designs for. At the start of a mix design project, target temperatures are specified for proper mixing and compaction. Aashto r 35 standard practice for superpave volumetric design for asphalt mixtures.
Asphalt mix design ms2 asphalt mix design methods pdf ms2 asphalt mix design methods ms2 asphalt mix design methods 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. Mix design methods for asphalt concrete, by the asphalt institute. Hot mix asphalt certified roadway course manual pdf hot mix asphalt certified roadway recertification course manual pdf hot mix asphalt certified plant technician course pdf hot mix asphalt certified plant technician field manual pdf hot mix asphalt mix design.