Manual of practice hma quality assurance spreadsheet program using measured values of e and d myung goo jeong, ph. Asphalt pavement refers to any paved road surfaced with asphalt. Hot mix asphalt is composed of aggregate bound together. This 2016 asphalt pavement design guide has been prepared to assist readers in understanding asphalt mix pavement design, construction, and rehabilitation. Pavement design analysis with 2002 design guide software. Hot mix asphalt hma is a combination of approximately 95% stone, sand, or gravel bound together by asphalt cement, a product of crude oil. Newly added with this version is jointed plain concrete overlay designs for all six types bonded on ashpalt, unbonded on asphalt, bonded on concrete, unbonded on concrete, bonded on composite, unbonded on compsosite. Pdf evaluation of airport flexible pavement hma fatigue. Hotmix asphalt the third component of a pavement system is the hotmix asphalt hma.
When approved, the product of nchrp 7a will form the basis for aashto pavement design standards. Perpetual pavement design software the apa offers two versions of its software for the design and analysis of perpetual pavements. Facilities development manual wisconsin department of. Aashtoware pavement me design is the next generation of pavement design software. When aggregate and asphalt binder are combined to produce a homogenous substance, that substance, hma, takes. Though the software can calculate the damage within hot mix asphalt hma layer, limited work was conducted to evaluate impact of aircraft types and pavement design on the fatigue within hma layer. Hma mix types differ from each other mainly in maximum aggregate size, aggregate gradation and asphalt binder contenttype. Hotmix asphalt hma pavement includes the many different types of mixtures of aggregate and asphalt cement that are produced at an elevated temperature in an asphalt plant. Recommended thickness design software for roadways. The general perpetual pavement design philosophy by definition, a perpetual pavement is a longlasting thick hma pavement structure with a service life in excess of 50 years without major structural rehabilitation andor reconstruction activities in particular the intermediate and bottom layers. The district office is required to submit pavement recommendations on all projects including. Overview of rigid pavement subbase design base layer combinations for concrete slab support crcp or cpcd. Hma pavement mix types include opengraded friction courses ogfc, stone matrix asphalt sma, and fine and coarse graded dense mixes.
The 2002 design guide and software developed by the minnesota department of transportation mnpave use the complex modulus of hotmix asphalt hma as a design parameter in the mechanistic design procedure. Mnpave flexible minnesota department of transportation mndot. Hma pavement sections and nine jointed concrete pavement jcp sections was implemented to provide data necessary for the local calibration of the mechanistic empirical pavement design software for high. Pavement me design software formerly known as darwinme. Asphalt cement is heated aggregate, combined, and mixed with the aggregate at an hma facility. One such structure that is gaining popularity is the use of rollercompacted concrete rcc base with a hotmix asphalt hma overlay. The superpave design process is part of a total pavement design system. Pavexpress is a free online tool to create pavement designs using key engineering inputs, based on the aashto 1993 and 1998 supplement pavement design process and equations.
As with the previous example, the hma pavement is based on common practice in ontario table 3a. Each layer receives the loads from the above layer, spreads them out, then passes on these loads to the next layer below. Im trying to simulate asphalt layers with viscoelastic behavior in abaqus. The mndot pavement design web site contains links to these and other. Long life flexible pavement alternatives using existing pavements introduction for purposes of this study, long life pavement is defined as pavement sections designed. These alternatives may also be considered on other projects at the discretion of the designer. Preliminary studies were carried out to determine possible differences between the aashtoware pavement me design, mepdg version 1. Pavement interactive focuses on densegraded hma because it is the most common hma pavement material in the u. This advisory circular provides guidance to the public on the design and evaluation of pavements used by aircraft at civil airports. Pavement selection is determined using the life cycle cost analysis method or lcca, when the total project pavement costs exceed 1. Superpave is a system of components that work together to provide a. Includes flexible and rigid pavement analysis software aashto guide for design of pavement structures, 1993. Mndot, the university of minnesota, and the lrrb have initiated a project to further calibrate the 2002 design guide to minnesota materials, conditions, and performance.
A that will assist in determining the appropriate structural pavement design methodology, pavement type, and design criteria. Pavement design software flexible pavement a computer program. The organization of the factors and inputs is based on the sections of the aashtoware pavement me design software. This draft users guide must be considered as preliminary as the. All asphalt pavements will be designed based on the following design life. In 2005, the department initiated research project 047141 to evaluate the mepdg for potential implementation. The longterm performance and durability of four hotmix asphalt mixtures at four different air void contents were evaluated with the dynamic modulus and beam fatigue apparatus. Hma mix 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. The mechanistic portions of the program rely on finding the tensile strain at the bottom of the asphalt layer, the compressive strain at the top of the subgrade, and the maximum principal stress in the middle of the aggregate base layer.
Asphalt pavement thickness and mix design asphalt institute. Mechanisticempirical pavement design guide mepdg software developed in nchrp projects 7a and 140 to use as an hma prs. Faarfield stands for faa rigid and flexible iterative elastic layered design. Designing the right pavement for the job got easier thanks to pavexpress, a free. The 1993 aashto guide for the design of pavement structures and previous versions is one of the primary documents used by state highway agencies for designing new and rehabilitated pavements. Mnpave flexible is a computer program that combines known empirical relationships with a representation of the physics and mechanics behind flexible pavement behavior. The wispave design program uses the aashto 1972 design equations for concrete and asphalt pavements. Hma pavement is typically delivered to a job site in dump trucks, at a temperature of 300315f. This guide presents examples of designs, procedures, and applications that have. Thickness design of a rollercompacted concrete composite. 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.
Hma pavement mix type selection guide transportation. A flexible pavement structure is typically composed of several layers of material. Streetpave 12 is the latest in jointed plain concrete pavement thickness design. It is userfriendly, where project designs can be shared, saved and printed. Calme also includes these major features, which are not included in the nchrp 7a mechanistic empirical pavement design guide. Producing high quality hma pavement requires a good partnership between caltrans, the plant producing the hma material and the contractor placing the hma. Nov 10, 2016 15053206f airport pavement design and evaluation. Mnpave flexible minnesota department of transportation.
The software only asks users for inputs required to create technically sound. Evaluation of airport flexible pavement hma fatigue using. Two pavement crosssections chosen for analysis are shown on the following tables. On such projects which also require polymer, 3 lifts of polymer modified mix will be required. The pavement design requires the proper hot mix asphalt paving mixtures for the base and surface pavements.
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. The current software also includes, as reference for designers, the asphalt institute method for new pavement designs and the empirical caltrans rvalue method for both new and rehabilitation pavement designs. Pavement designers specify different hma mixture types, depending on the type of project or application. The 1993 aashto guide for the design of pavement structures and previous versions is one of the primary documents used by state highway agencies. 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. Investigation of aashtoware pavement me designdarwinme. Hma pavements are classified as flexible pavements because the total pavement structure deflects, or flexes, under loading. Both versions of the software are available as free downloads. Asphalt design software serving the needs of liquid asphalt manufacturers and suppliers worldwide since 1919. Hotmix asphalt hma is a generic term that includes many different types of mixtures of aggregate and asphalt cement binder produced at elevated temperatures generally between 300350. Structural pavement design structural design of hma. Hma mix design fundamentals hma consists of two basic ingredients. A modern hot mix asphalt facility provides high production, good quality mixes including recycled asphalt pavement if desired while meeting stringent air quality standards. Local calibration of the mechanisticempirical pavement.
The asphalt pavement alliance apa offers two versions of its software for the design and analysis of perpetual pavements. Determination of hma modulus values for use in mechanisticempirical pavement design. Hma is referred to as asphalt pavement, blacktop, or macadam. Both pavements have a 15 m wide paved surface with curb and gutter. The mechanistic portions of the program rely on finding the tensile strain at the bottom of the asphalt layer, the compressive strain at the top of the subgrade, and the maximum. Hot mix asphalt may be referred to by several names. Functional treatments must show a 30year projection or until functional. Determination of hma modulus values for use in mechanistic. Thickness design of a rollercompacted concrete composite pavement system many agencies continue to investigate ways of optimizing pavement designs to save money while still providing a durable pavement structure. Available software include faarfield, comfaa, compsys, and other programs. This paper investigates the impact of different aircraft models on pavement thickness design. Pavexpress webbased scoping tool eases pavement design. Quality asphalt pavement may be constructed in a wide range of soil, weather, and loading conditions. Hma pavements serve in a multitude of traffic and environ mental conditions, demanding that the materials and design meet specific engineering requirements.
The pavement design analysis provided with the pavement report should support the chosen alternative by depicting service lives and cost of ownership of the alternative treatments. In march 2004, the nchrp 7 report and the mechanisticempirical pavement design guide software mepdg were released. These faqs are categorized into subject areas listed in the contents dropdown box below. Evaluation of airport flexible pavement hma fatigue using faarfield article pdf available in international journal of scientific and engineering research 101. In different sections of the state it may also be referred to as bituminous concrete,hot plant mix,asphalt concrete, blacktop or superpave. Ac 15053206f airport pavement design and evaluation. Airport design software supports pavement design and pay reductions for airport pavement projects. The base construction input is only for a new hma pavement and is an important parameter used to calculate the predictive performance of the pavement. If there is no visible distress in the existing hma pavement other than in isolated areas. Design considerations had prior experience with biaxial geogrid with good results worked with company representative and utilized their design software to determine our project met minimum cover requirements of 6 of 22a over the geogrid. The pcc pavement is taken from the portland cement associations streetpave program table 3b.
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