Multipave framework to compare the design outputs with other design methods. State pavement design engineer office of materials and research. The 1993 aashto guide for design of pavement structures is the only approved design method for cpcd projects. Flexible and rigid pavements, principles of design, empirical and analytical design procedures. Nchrp 7a design method 621 trial cross sections for nchrp 7a flexible pavement design. 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.
Itd, aashto, and mepdg pavement design methods a comparison. Comparative studies of flexible and rigid pavement design. The aashto guide for design of pavement structures aashto, 1993 is the primary document used to design new and rehabilitated highway pavements. Aashto issues revised pavement design guide aashto journal. These methods range from very simple empirical methods. The kvalue input required for this design method is determined using the following steps. Design based on serviceability decrease aashto, 1993 flexible. This article presents the 1993 aashto guide basic design equation for flexible pavements. Aashto design guide, justify the variance, and document the actions in the. Can use load spectra instead of esals computationally intensive.
This solution method is an iterative process that solves for esals in both equations by. The aashto lrfd bridge design specifications are intended for use in the design, evaluation, and rehabilitation of bridges. Huang aashto guide for design of pavement structures principles of pavement design by e. The aashto materials standards contain specifications, test methods, and provisional standards commonly used in the construction of. Approximately 80% of all states use the aashto pavement design procedures, with the majority using the 1993 version. In this video, you will know how to design a flexible pavement with examples using aashto method and curves to make you available to.
What are the various flexible pavement design methods. Aashto method of flexible pavement design there is document aashto method of flexible pavement design available here for reading and downloading. It also presents a plan for an improved pavement design method based on mechanisticempirical procedures. Appendix c nhi05037 federal highway administration. Ai method zprinciples consider pavement structure as multilayered elastic.
Background several design methods for flexible pavements are currently practiced in the u. 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. The kvalue to be input in the input form and in the seasonal kvalue sheet is the actual subgrade soil modulus of subgrade reaction. The common design method for flexible pavement are the aashto method, asphalt institute and two layer system. Pavexpress, a webbased pavement scoping tool that simplifies the design of flexible and rigid pavements, is also based on aashto 93. 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 current aashto method is a regression method based on the results of road tests.
Aashto method of flexible pavement design road surface. Using the aashto flexible design procedure, design a pavement for a rural principal arterial road by answering the questions below. The joint spacing was the focus of the alterations made to the original aashto 1993 rigid pavement design equations and for this reason the aashto 1998 rigid pavement design supplement is best suited to the design of jpcps. Embankment, subgrade, subbase and base courses, bituminous surface courses, internal and surface drainage of pavements, pavement.
Software for the verification of road flexible and semirigid pavements. Pdf flexible pavement designaashto method abdulrahman. The structural design of flexible pavements has long been determined using empirical equations. Different methods of pavement design are proposed at different points of time, for example, cbrthickness approach, limiting deflection approach, bearing capacity approach, equivalent granular thickness approach and so on, 14, 2123. Modified aashto design method for geogrid reinforced flexible pavements existing design methods for flexible pavements include. Aashto pavement thickness design guide when designing pavement thickness for flexible and rigid pavements, the following considerations should be used. Aashto guide for design of pavement structures 1993. Arizonas present pavement design guide was developed by the materials section in 1989 with revisions issued in 1991 and 1992. Design of flexible pavement using aashto method youtube. Elliott the resilient modulus value 3,000 psi used to represent the aasho road test subgrade in the aashto flexible pavement design equation is examined.
Aashto guide for the design of pavement structures overlays, 1993. Each layer receives loads from the above layer, spreads them. The pavement design is done for both the flexible and rigid pavements used along the roadway. The pavement structure is to consist of asphalt concrete with an elastic modulus of 400,000 psi, a granular base with an elastic modulus of 25,000 psi, and a granular subbase. The current flexible pavement design system in egypt was adopted primarily from the aashto1993 design guide. The method discussed in the text example 208 applies to esals greater than 50,000 for the performance period. Based on engineering mechanics that have been validated through extensive road test. Aastho flexible pavement design method objectives know the factors considered in the aashto design method become familiar with use of tables 20. Jointed plain concrete pavement jpcp continuously reinforced concrete pavement crcp pavement design.
Flexible pavements are so named because the total pavement structure deflects, or flexes, under loading. The report presents an analysis of the results and conclusions with implications for caltrans pavement design practices. Use the download button below or simple online reader. Design of flexible pavement using aashto method in this video, you will know how to design a flexible pavement with examples using aashto method and curves to make you. Compare current itd design method for flexible pavements with aashto 1993 and mepdg methods. Files download flexible pavement design excel calculator free. Please see the aashto 1993 pavement design guide for guidance. Aashto design method the pavement design is done for both the flexible and rigid pavements used along the roadway. The empirical expression relating traffic, pavement structure, and pavement performance for flexible pavements is. Contents design of flexible pavements mechanistic design approach empirical design approach mechanisticempirical design. In aashto 1993 method, the pavement is designed based on an index which represents the overall strength of the pavement structure. Design of flexible pavement using aashto method in this video, you will know how to design a flexible pavement with. This project will consist of the construction of a new flexible pavement to extend route. The american association of state highway and transportation officials has released a new publication.
Lecture 37 flexible pavement design aashto method 1993 lecture series on introduction to transportation engineering by. Aashto method of flexible pavement design road surface road. For most flexible pavement design work, especially highervolume highways 10,000 adt, 5 m esals, the flexible pavement design system fps 21 is the required method for designing flexible pavements. Comparison of mechanisticempirical and empirical flexible. Each layer receives loads from the above layer, spreads th. Several organisations have adopted the benkelman beam deflection method for structural evaluation of flexible pavements and overlay design the aashto, the asphalt institute, the transport and road research laboratory trrl, london, the canadian good roads association cgra, besides the indian roads congress irc to name a few. Relevant design data where obtained from dar consult and technique cone. Untreated base bituminoustreated base cementtreated base. Design a flexible pavement overlay using the aashto method for a 5year old pavement structure consisting of 5. Inclusion of the resilient modulus test rvas prompted by the need for a rational evaluation method. New flexible pavement design example 1993 aashto pavement design project name and location. Download flexible pavement design excel calculator free.
Transportation researcii rtcord i 196 resilient modulus and aashto pavement design ronrnr p. Determine drainage modifying factor m from table 11. For untreated base can also use the following instead of interpolating from the figure. The pavement design should consider the traffic load that comes on the roadway, temperature induced stresses like swelling, and heave induced by extreme cold climates.
The standard method in the 1993 aashto guide for design of pavement structures involves calculating a weighted average subgrade resilient modulus based on the relative pavement damage. By default, the tool uses a layer coefficient a of 0. Cbr method for flexible pavement design part 2 in this video we will learn how to design a flexible pavement using cbr method in two ways. This revised manual provides an overview of the methodology termed mechanisticempirical or me pavement design. The future traffic to be sustained over the next five years will be 2. It is an empirical design method based on the results of the late 1950s aasho road. A flexible pavement structure is typically composed of several layers of materials. The file extension pdf and ranks to the school work category. Flexible pavement empirical design example pavement. These equations were derived from road tests which recorded the loads acting on a series of test pavement sections and then recorded the damage caused by this loading. Modified asphalts in pavement design optimization of asphalt mixtures and. Aashto method of flexible pavement design download. The present study applied the aashto and pca method for design of rigid pavements, for both pavement types using 20 year design life and 5% annual growth rate.
Calculate proper pavement thickness with free online tool. Aashto method of flexible pavement design free download as powerpoint presentation. The kvalue used in this design procedure is not a composite k, as in the original aashto design procedure. Selection of subgrade modulus for aashto flexible pavement design robert p. Because lower values of subgrade resilient modulus result in more pavement damage, lower values of subgrade resilient modulus are weighted more heavily. Design methods highway pavements aashto the asphalt institute. The aashto method of rigid pavement design was developed from performance data of jointed plain concrete pavements jpcp.
297 414 1116 690 525 850 908 1263 1335 154 968 1249 1579 1586 1428 1176 971 192 972 851 1553 1320 320 378 807 154 963 1541 1155 340 1316 1193 1050 147 713 136 1056 226 317 722 826 848 1196 1004 26 470