Outline pavement purpose, pavement significance, pavement condition, pavement types flexible and rigid, pavement design, examples,load support,drainage. Paveinstruct accompanies pavexpress, a webbased software created to design flexible and rigid pavements using aashto 9398. The reliability of a pavement designperformance process is the probability that a pavement section designed using the process will perform satisfactorily over the traffic and environmental conditions for the design period. Highway design manual november 2014 appendix 71 1 flexible pavement analysis the aashto chart 4002 7 following the example in this appendix is for a flexible pavement. Files download flexible pavement design excel calculator free. Flexible pavements are so named because the total pavement structure deflects, or flexes, under loading. Aashto method of flexible pavement design road surface. Flexible overlay pavement design example 1993 aashto pavement design project name and location. Pavexpress, a webbased pavement scoping tool that simplifies the design of flexible and rigid pavements, is also based on aashto 93. Vermont agency of transportation metric flexible pavement design procedures for use with the 1993 aashto guide for design of pavement structures the vermont agency of transportation procedure for the design of new or reconstructed pavement structures is based on the 1993 aashto guide for design of pavement structures. Incredible way the cia stole a soviet submarine during cold war duration. Flexible pavement design state of the practice ncat report 14.
Flexible pavement design road based on aashto guide download link. Work can be verified by using the flexible pavement structural design utility. 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. Aashto pavement thickness design guide when designing pavement thickness for flexible and rigid pavements, the following considerations should be used. Brasfield and gorrie professor of civil engineering principal investigator dr. Empirical equations are used to relate observed or measurable phenomena pavement characteristics with outcomes pavement performance. What is cbr testing california bearing test learn more about testing the soil duration. Engineers must always determine the requirements of the. The american association of state highway and transportation officials has released a new publication. Aashto method of flexible pavement design free download as powerpoint presentation. Design methods highway pavements aashto the asphalt institute portland cement association airfield pavements faa the asphalt institute portland cement association u.
Aastho flexible pavement design method objectives know the factors considered in the aashto design method become familiar with use of tables 20. Design a new flexible pavement for a major interstate highway using the following. Arizonas present pavement design guide was developed by the materials section in 1989 with revisions issued in 1991 and 1992. Pavexpress is a free, webbased tool for the structural design of flexible and rigid pavements using the aashto 9398 supplement design guide. This design manual addresses methods to properly develop a rehabilitation project, pavement milling, and the computations necessary for the pavement design process. March 2015 flexible pavement design manual march 2015 implementation memo flexible pavement design manual. Modified aashto design method for geogrid reinforced flexible pavements existing design methods for flexible pavements include. The empirical expression relating traffic, pavement structure, and pavement performance for flexible pavements is. Guide, and verified against the original design method. Aashto issues revised pavement design guide aashto journal. Roadway design florida department of transportation.
Ndot utilizes the 1993 aashto guide for design of pavement structures and part ii supplement as a basis for pavement design. This is an introduction to flexible pavement design for engineers. Oldfashioned asphalt pavement thin asphalt layer over a granular base is mostly a flexible pavement. Ncat report 14 04 flexible pavement design state of the practice. The method discussed in the text example 208 applies to esals greater than 50,000 for the performance period. Highway design manual november 2014 appendix 71 1 flexible pavement analysis the aashto chart 4002 7 following the example in this appendix is for a flexible pavement, terminal serviceability index pt of 2. Sep 20, 20 outline pavement purpose, pavement significance, pavement condition, pavement types flexible and rigid, pavement design,examples,load support,drainage. Flexible overlay pavement design example 1993 aashto pavement. New flexible pavement design example 1993 aashto pavement design project name and location. Aashto flexible and rigid pavement design equations. An empirical analysis of flexible pavement design can be done with or with out a soil strength test. Download flexible pavement design excel calculator free.
Each layer receives loads from the above layer, spreads th. Indiana, for example, was an early implementer of the. In this video, you will know how to design a flexible pavement with examples using aashto method and curves to make you available to. Sep 25, 2017 pavement design transportation engineering 1. Minimum design standards are based on recommendations of caltrans, aashto. Cee320 winter2006 pavement design cee 320 steve muench 2.
For help on the use of this excel tool, you can download its. Based on engineering mechanics that have been validated through extensive road test. Flexible overlay pavement design example 1993 aashto. 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. By default, the tool uses a layer coefficient a of 0. Revision of aashto pavement overlay design procedures. Pdf design and analysis of flexible pavement malik. Introduction to flexible pavement design ced engineering. Pavement design introduction design of flexible pavements. Base surface course subbase subgrade pavement flexible pavement rigid. Flexible pavement design road based on aashto guide. An example of design without soil strength test is by using hrb soil classification system, in which soils are grouped from a1 to a7 and a group index is added to differentiate soils within each group.
Army corps of engineers objectives of pavement design to provide a surface that is. It supports pavements of all traffic levels, and includes modules for designing asphalt overlays, materials costing, layered elastic analysis, and more. Please see the aashto 1993 pavement design guide for guidance. Pavement design zintroduction ztraffic load analysis zpaving materials zflexible pavement design zrigid pavement design 6. Calculate proper pavement thickness with free online tool. Aashto method of flexible pavement design road surface road. The standard method in the 1993 aashto guide for design of pavement. What are the various flexible pavement design methods. 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. The baseline flexible pavement design is a threelayer system consisting of an asphalt concrete ac surface layer over a nonstabilized graded aggregate base gab layer over subgrade sg. Method 2 uses nondestructive test ndt deflection data to calculate overlay thickness. The spreadsheet breaks the design process into 10 steps and is designed to prompt the user for. This solution method is an iterative process that solves for esals in both equations by.
Pavement designanalysis software university of idaho. New flexible pavement design example 1993 aashto pavement. A that will assist in determining the appropriate structural pavement design methodology, pavement type, and design. Development of a more sophisticated mechanistic ap proach to overlay design was not within the scope of the revisions.
Functional and structural flexible pavement overlay o. For the example design scenario, a 30year design life is specified. A revision was not issued to formally adopt the 1993 version of aashto guide for the design of pavement structures because adot had. Design checksan example the lea can be used to check on other design approaches such as aashto 93. Aashto 1993 pavement design spreadsheet civilweb spreadsheets. The empirical aashto pavement thickness design procedure developed in the 1960s and currently used by many agencies across the u. Flexible pavement design state of the practice research synopsis 1404 for the full report, see ncat report 1404 at. It is not intended as definitive treatise, and it does not encompass the design of rigid pavements. Pavement design two theoretical pavement types flexible pavement resists traffic loading through internal friction. Aashto 1993 flexible pavement designs were established on the basis of the specifications of the aashto road test which in turn considers.
The existing aashto flexible pavement design equation does not currently predict the pavement performance of the strategic highway research program long term pavement performance studies test sections very accurately, and typically overestimates the number of equivalent single axle loads needed to cause a measured loss of the present. Design a new flexible pavement for a major interstate highway using the following conditions four lanes each direction. This concept was retained to maintain compatibility between parts ii and iii of the guide and to keep the procedure relatively simple. This project will consist of the construction of a new flexible pavement to extend route.
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. The method discussed in the text applies to esals greater than 50,000 for the performance period. Flexible pavement empirical design example pavement. The steps in the 1993 aashto flexible pavement design procedure are summarized below in the context of the example baseline scenario presented in section 6. The input parameters for the baseline design using the 1993 aashto flexible procedure for new pavements are summarized in table 62.
This revised manual provides an overview of the methodology termed mechanisticempirical or me pavement design. Pavement design with examples complete data civildigital. Engineers are cautioned that much of pavement design is governed by codes, specifications and practices of public agencies. An unpaved road with a compacted crushed stone course is a pure flexible pavement. Determine drainage modifying factor m from table 11. A flexible pavement structure is typically composed of several layers of materials. Aashto flexible pavement design, aashto rigid pavement. Strong surface strength moisture control smooth safe friction drainage economical initial.
This suite of spreadsheets allows the designer to complete the structural design of flexible roads in accordance with the aashto 1993 guide in minutes. This project will consist of the construction of a flexible overlay of an existing flexible pavement to extend route 123 to intersect with route i80 in north jersey. Cee 3604 transportation engineering pavement design. This empirical equation is widely used and has the following form. Bayomy for the aashto equivalent axle load factors for flexible and rigid pavements. Aashto flexible pavement design method road surface. Robbins assistant research professor national center for asphalt technology dr. The 1986 aashto guide for the desigrr of pavement structures l requires the use of the subgrade tesilient modulus to design a flexible pavement.
Strong surface strength moisture control smooth safe friction drainage economical initial construction. Reevaluation of the aashtoflexible pavement design equation. Ncat report 14 04 flexible pavement design state of. Flexible pavement empirical design example pavement interactive. The civilweb aashto 1993 pavement design spreadsheet is a complete design solution for the structural design of flexible roads. Nddot implementation of aashto flexible pavement design adt. The current aashto method is a regression method based on the results of road tests. Design of flexible pavement using aashto method youtube.
The design comparisons include pavement structures subjected to a range in traffic, as represented by traffic indexes of 7, 9, 11, and 15, and a range in subgrade strengths, as measured by subgrade rvalues of 5, 20, and 40. The paveinstruct learning module is a webbased pavement design education system with video instruction by leading industry experts. This report compares the caltrans and aashto pavement thickness design procedures. By looking at several different design periods and reliability levels this example gives an idea of the relative influence of these inputs.
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