The slab length will be 30 feet and dowels will provide load transfer at the joints. In this video, you will know how to design a rigid pavement using aashto method and curves to make you available to develop structure pavement. Can use load spectra instead of esals computationally intensive. This is evident in the flexible pavement design equation presented in this section. Design checksan example the lea can be used to check on other design approaches such as aashto 93. This project will consist of the construction of a new flexible pavement to extend route 123 to intersect with route i80 in north jersey.
For jointed concrete pavements, regardless of whether reinforced or nonreinforced, the aashtoodot method of pavement design calculates the same. The civilweb aashto 1993 pavement design spreadsheet is a complete design solution for the structural design of flexible roads. Dec 14, 2017 in this video, you will know how to design a flexible pavement with examples using aashto method and curves to make you available to develop structure paveme. In this video, you will know how to design a flexible pavement with examples using aashto method and curves to make you available to. Crcp design has undergone significant changes from the 1993 aashto pavement design guide. Calculate the effective modulus of subgrade reaction k this calculation is a multistep process in the 1993 aashto guide for design of pavement structures. Albalbissr this paper applies statistical and probabilistic methods to the design of pavements, using the existing aashto equations. The empirical aashto pavement thickness design procedure developed in the 1960s and currently used by many agencies across the u.
Flexible pavement empirical design example pavement. New flexible pavement design example 1993 aashto pavement design project name and location. Perpetual pavement asphalt pavement designed to last over 50 years without major structural rehabilitation needing only periodic surface renewal. Composite overlay pavement design example 1993 aashto. Fulldepth pavement constructed on subgrade deepstrength pavement constructed on thin granular base course aka extendedlife pavement or longlife pavement. It should also be noted that in 2008, aashto released the mechanisticempirical pavement design guide.
This replaces the previously accepted design method, aashtos guide for design of pavement structures, 1993, commonly referred to as aashto 1993. Pavement design introduction design of flexible pavements. Aashto design method calculate the equivalent single axle 18 kip load, esal. Pavement markings at on and offramps are more complex, and example markings were. Interestingly, the lowvolume road design procedure is a simplified version of 17 the highvolume road design procedure similar design charts and input requirements are used. Strong surface strength moisture control smooth safe friction drainage economical initial.
Finally, example problems are included in this document to demonstrate the robustness of the new. In addition to providing an analytical approach to structural pavement design, chapter 54 presents an analytical method for selecting the most economical pavement design that can be expected to meet structural design requirements. Determine drainage modifying factor m from table 11. Paul guyer is a registered civil engineer, mechanical engineer, fire protection engineer, and architect with over 35 years experience in the design of buildings and related. Cee320 winter2006 design catalog example design catalog from the washington asphalt pavement association wapa for residential streets 31. Aashto method of flexible pavement design road surface road. The aashto components were developed in accordance with the 1993 aashto pavement design. For example aashto 93 was used to develop straightforward pavements to accommodate 40 year lives with 500,000 and 1 million esals 18,000 lb single axle with dual tires.
Flexible pavement designs 1993 flexible design equation logw18z. Odot home divisions engineering pavement engineering pavement design manual. Based on aashto guide for design of pavement structures 1993 appendix d assumed pt 2. May, 2012 aashto 1993 flexible pavement design considers a number of inputs regarding the structure of the pavement, the subgrade support available and the maximum bearable load. The thicknesses of the different layers are calculated for each set of design requirements. A simple empirical guide to lowvolume road pavement. The concrete slab is designed for a compressive strength of 5500 psi. A simplified pavement design tool county engineersmd. In this video, you will know how to design a flexible pavement with examples using aashto method and curves to make you available to develop structure paveme. The structural number also determines what the 80 kn 18,000 lb. Composite overlay pavement design example 1993 aashto pavement design project name and location. Strong surface strength moisture control smooth safe friction drainage economical initial construction. Guide, and verified against the original design method. Different pavement types use different types of joints and reinforcement to control the forces acting on the concrete pavement.
The standard method in the 1993 aashto guide for design of pavement structures involves calculating a weighted average subgrade resilient modulus based. Please note that the structural coefficient of the base layer 0. The method discussed in the text example 208 applies to esals greater than 50,000 for the performance period. Flexible pavement design state of the practice research synopsis 1404 for the full report, see ncat report 1404 at. Structural design the object of the design using the aashto method is to determine a flexible pavement sn adequate to carry the projected design esal. Aashto pavement thickness design guide when designing pavement thickness for flexible and rigid pavements, the following considerations should be used. Cee 3604 transportation engineering pavement design. Crcp performance problems observed in the past,such as material durability, base erosion, steel placement and content, and construction methods have been addressedand the improved pavement. A major initiative in pavement design was the development and implementation of the mechanisticempirical me methods. The spreadsheet breaks the design process into 10 steps and is designed to prompt the user for.
Pavement design with examples complete data civildigital. Implementation of the aashto pavement design procedures. Approximate elastic method, or equivalent strip method aashto 4. Design methods highway pavements aashto the asphalt institute portland cement association airfield pavements faa the asphalt institute portland cement association u. Minimum design standards are based on recommendations of caltrans, aashto. We will assume that the initial pavement serviceability index will be 4. In the flexible pavement design, the three layers i. Aashto method, asphalt institute method, atj 585 revised 20 topic 2 rigid pavement design concrete pavement in malaysia concrete pavement elements subgrade and subbase design shoulder options design of rigid pavement aashto method pca method joints steel design. Probabilistic design of flexible and rigid pavements using. Conversion factors are available to express axle loads other than 18,000 lbs. Transportation mdot currently uses the me design method as its standard for crosssectional pavement design for new and reconstruct pavement projects.
Paveinstruct accompanies pavexpress, a webbased software created to design flexible and rigid pavements using aashto 9398. The major purpose for applying such methods was to assess the variation of the pavement geometry as a function. This represents a typical range of reliability levels encountered for interstate highways. New flexible pavement design example 1993 aashto pavement.
By looking at several different design periods and reliability levels this example gives an idea of the relative influence of these inputs. Design of rigid pavement using aashto method youtube. Indiana, for example, was an early implementer of the design software when it was called the mepdg and currently uses it as the primary design. It was derived from empirical relationships at the aashto road test and therefore a hotmixasphalt base should. In 2010, adot contracted with applied research associates, inc. Densegraded hma mix with a nominal maximum aggregate sizeof 25 mm 1 inch. Pavement markings at the start and end of parttime shoulder use segments and through ramp freeway junctions were discussed in the geometric design section of this chapter. Design a new rigid pavement for a major interstate highway using the following conditions four lanes each direction. This replaces the previously accepted design method, aashtos guide for design of pavement structures, 1993, commonly referred to. The paveinstruct learning module is a webbased pavement design education system with video instruction by leading industry experts. There are many different types of empirical equations available today but this section will present the 1993 aashto guide basic design equation for rigid pavements as an example. Rigid pavement empirical design example pavement interactive. Aashto 1993 pavement design spreadsheet civilweb spreadsheets. Sep 25, 2017 cee320 winter2006 pavement design several typical methods design catalog empirical 1993 aashto method mechanisticempirical new aashto method as yet unreleased 30.
Pavement design equations the aashto design equations as presented in the aashto interim guide for design of pavement structures, 1993 are to be used for the design of both flexible and rigid pavements. The aashto 1993 flexible pavement design emphasizes on the particulars involved in designing the pavements meticulously so that they can bear the traffic load and the impact of the temperature variation at the same time. Implementation of the aashto pavement design procedures into. Dec 11, 2017 for the love of physics walter lewin may 16, 2011 duration.
This project will consist of the construction of a flexible overlay of an existing concrete pavement to extend route 123 to intersect with route i80 in north jersey. Aashto 1993 flexible pavement designs were established on the basis of the specifications of the aashto road test which in turn considers. Longterm concrete properties, including creep and shrinkage strains, shall be determined in accordance with aashto. Unless otherwise noted, the design of joints and bearings shall be in accordance with the latest aashto, as supplemented by the aashto guide specifications for lrfd seismic bridge design, where applicable. The accompanying software, aashtoware pavement me design, was released in 2011. Nddot implementation of aashto flexible pavement design. Secondly, this technical summary describes the key crcp design inputs to assist the pavement engineer through the crcp design process with the aashto pavement me design software, including identifying the most sensitive design inputs and features. Ncat report 14 04 flexible pavement design state of. The manual chapters, sections, and procedures were setup similar to those in the 1993 aashto guide for design of pavement structures, to allow for easy referencing. Design of flexible pavement using aashto method youtube. Current aashto methods are based on empirical relationships between traffic loading, materials, and pavement performance developed from the aasho road test 19581961.
Accessible via the web and mobile devices free no cost to use based on aashto pavement design equations userfriendly share, save, and print project designs. Probabilistic design of flexible and rigid pavements using aashto equations annan a. Njdot companion manual to the 1993 aashto guide for the. Pavement structure aashto afs are significantly influenced by the two pavement types, flexible and rigid, considered by the aashto pavement design guide. For the example design scenario, a 30year design life is specified. Materials investigation and selection information 1. Therefore, the structural number is required to determine the number of esals to design for before the pavement is ever designed. Flexible pavement empirical design example pavement interactive.
The inputs emphasized on the maximum load that the pavement would be able to bear over its lifetime, the performance of the pavement design with an increase in the traffic load. For example, the user may decide to provide edgedrains for the nondoweled design, which will change the drainage coefficient, cd. According to local practice, the pavement will be designed as jpcp with tied concrete shoulders. Aashto design method calculate the esals for a design period without any future growth. Aashto 2002 pavement design guide design input evaluation study. Determine the traffic esal calculate the select the performance level solve for the required topic 7 aashto flexible pavement design 1. Jointed plain concrete pavement jpcp continuously reinforced concrete pavement crcp pavement design. The aashto guide for design of pavement structures aashto, 1993 is the primary document used to design new and rehabilitated highway pavements. In addition, to improve the statistical significance of the calibration process, selected pavement sections should also encompass performance data that extend over the entire pavement design life. Aashto 2002 pavement desgin guide design input evaluation study executive summary many highway agencies use aashto methods for the design of pavement structures. Ncat report 14 04 flexible pavement design state of the practice. For example, if a pavement design is evaluated over a 20year period, the selected pavement sections used in the calibration process should include. The research team developed a framework for the companion manual that met njdots requirements. Aashto defines esal as 18,000 lbsit is denoted in the literature by the symbol w18.
Design example 6 appendix a example 6 deck design, inlcuding collision on a type 7 or type 10 m barrier example 6. Nddot implementation of aashto flexible pavement design adt. A free, online tool to help you create simplified pavement designs using key engineering inputs, based on the aashto 1993 and 1998 supplement pavement design process. Welcome to maccaferri flexpave, a simplified excel worksheet for the design of flexible pavements with and wi maccaferri geogrids, utilizing the aashto 93 design guidelines. While the me pavement design guides mepdg have been officially adopted e. The steps in the 1993 aashto rigid pavement design procedure are summarized below in the context of the example baseline scenario presented in section 6. For jointed concrete pavements, regardless of whether reinforced or nonreinforced, the aashto odot method of pavement design calculates the same. Introduction to rigid pavement design ced engineering.
1152 565 1443 300 587 1135 719 469 368 226 626 564 215 685 926 52 1010 718 837 167 353 1127 427 895 1058 684 584 815 322 1071 679 379 828 1407 719 360 130