The reliability of the pavement design performance 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. Supplement to the aashto guide for design of pavement. Arizonas present pavement design guide was developed by the materials section in 1989 with revisions issued in 1991 and 1992. Next provide more than 20 images of aashto 1993 pavement design spreadsheet. By default, the tool uses a layer coefficient a of 0. The 1993 aashto guide for design of pavement structures is the only approved design method for cpcd projects. The 1993 version of aashto guide for design of pavement structures is the basis for developing the modules. Nov 10, 2014 pavexpress, a webbased pavement scoping tool that simplifies the design of flexible and rigid pavements, is also based on aashto 93. Aashto 1993 pavement design spreadsheet spreadsheet. We will assume that the initial pavement serviceability index will be 4.
Use the 1993 aashto rigid pavement design method to calculate % reinforcement for a crcp for the data in table 2. 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. This suite of spreadsheets allows the designer to complete the structural design of flexible roads in accordance with the aashto 1993 guide in minutes. Flexible overlay pavement design example 1993 aashto pavement design project name and location. Because lower values of subgrade resilient modulus result in more pavement damage, lower values of subgrade resilient modulus are weighted more heavily. Please see the aashto 1993 pavement design guide for guidance. Geotechnical aspects of pavements reference manual appendix d. Sep 25, 2017 cee320 winter2006 pavement design several typical methods design catalog empirical 1993 aashto method mechanisticempirical new aashto method as yet unreleased 30. The aashto reliability concept the aashto definition of reliability is. These overlay design procedures were recently revised to make them. Jun 17, 2017 this lecture includes following topics design of rigid pavements what are rigid pavements. History of aashto method design curves and equation of aashto method input of design parameter procedure of thickness design examples. Aashto 1993 pavement design spreadsheet civilweb spreadsheets.
Aashto 1993 pavement design spreadsheet spreadsheet collections. New flexible pavement design example 1993 aashto pavement. Cee320 winter2006 design catalog example design catalog from the washington asphalt pavement association wapa for residential streets 31. Pavement design with examples complete data civildigital. K typical pavement distress typeseverity descriptions. This equation is widely used and has the following form see figure 6. This project will consist of the construction of a flexible overlay of an existing flexible pavement to extend route 123 to intersect with route i. Flexible overlay pavement design example 1993 aashto. This concept was retained to maintain compatibility between parts ii and iii of the guide and to keep the procedure relatively simple. Perpetual pavement asphalt pavement designed to last over 50 years without major structural rehabilitation needing only periodic surface renewal.
The structural overlay design for arizona soda procedure. This time the method was not based upon data obtained from the aashto road test. Based on the results of the agency survey, the aashto 1993 guide for the design of pavement structures aashto 1993 is the most commonly used design method, with 39 responding agencies reporting its use for at least one type of pavement design. Called flexible since the total pavement structure bends or flexes to accommodate traffic loads. Revision of aashto pavement overlay design procedures. The 1993 aashto guide for design of pavement structures. It should be noted 46 that the esal take into account mixed traffic loads. The mechanisticempirical approach at the heart of the nchrp. 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. Use the modulus of subgrade reaction from problem 2 above where needed but do not use a value lower than 50 pci. Aashto guide for design of pavement structures, 1993. 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.
Lecture series on introduction to transportation engineering by prof. Jointed plain concrete pavement jpcp continuously reinforced concrete pavement crcp pavement design. Development of a more sophisticated mechanistic ap proach to overlay design was not within the scope of the revisions. This project will consist of the construction of a new flexible pavement to extend route 123 to intersect with route i80 in north jersey. Design of rigid pavement using aashto method youtube.
There are two standard us esal equations derived from the aashto road test, 44 both dependent on the pavement type rigid or flexible and on the pavement structure slab 45 thickness for rigid pavements, and structural number for flexible pavements. 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. Aashto guide for design of pavement structures, 1993 volume 1. 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. The aashto reliability concept pavement interactive. Lecture 37 flexible pavement design aashto method 1993.
Cee320 winter2006 pavement design several typical methods design catalog empirical 1993 aashto method mechanisticempirical new aashto method as yet unreleased 30. Aashto flexible and rigid pavement design equations. Ncat report 14 04 flexible pavement design state of. Chapter three survey of agency pavement design practices. Use of the 1993 aashto guide, mepdg and historical. Roadway design memorandum turnout paving in pm10 non. Aashto design example rigid pavements problem statement we are going to design a limitedaccess highway in an exurban area. A simplified pavement design tool county engineersmd. Cut across the e sb cut across m r to the tl vertically meet other line read kvalue k600pci topic 10 aashto rigid pavement design figure 12. The paveinstruct learning module is a webbased pavement design education system with video instruction by leading industry experts. What is cbr testing california bearing test learn more about testing the soil duration.
Calculate proper pavement thickness with free online tool. For the 1993 aashto design, the required thickness for the pcc slab increases substantially from 10. Consider all failure criteria steel strength, crack spacing and width. The reliability of the pavement design performance 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 aashto, 1993 1. For the example design scenario, a 30year design life is specified. Fulldepth pavement constructed on subgrade deepstrength pavement constructed on thin granular base course aka extendedlife pavement or longlife pavement. Rigid pavement empirical design example pavement interactive. A revision was not issued to formally adopt the 1993 version of aashto guide for the design of pavement structures because adot had. Composite overlay pavement design example 1993 aashto pavement design project name and location. The purpose of this manual revision is to present guidance on how adot currently uses the 1993.
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. According to local practice, the pavement will be designed as jpcp with tied concrete shoulders. The primary objective of the study presented in this paper is to develop design curves for performance prediction of stabilized layers and to compare semi rigid flexible pavement designs between the empirical aashto 1993 and the mechanisticempirical pavement design methodologies. An empirical analysis of flexible pavement design can be done with or with out a soil strength test. The aashto 1993 rigid pavement design guide was updated in 1998 with a supplement improving the method for design of concrete pavements. Subbase thickness10 subbase modulus30,000 psi subgrade m r10,000 psi to get k.
Files download flexible pavement design excel calculator free. Mdt currently uses a pavement design method based upon the 1993 guide and darwin software, with adjustments made based upon mdts past experience and pavement materials. Depending on the 1993 aashto guide inputs such as reliability levels or layer coefficients thicker pavement sections can result. The slab length will be 30 feet and dowels will provide load transfer at the joints. Flexible pavement empirical design example pavement. Use the 1993 aashto empirical equation using the previously calculated esal results and the 1993 aashto empirical rigid pavement design equation the following pavement thickness designs can be calculated. Pavexpress, a webbased pavement scoping tool that simplifies the design of flexible and rigid pavements, is also based on aashto 93. Nchrp 7a design method 621 trial cross sections for nchrp 7a flexible pavement design. Properties of rigid pavements components of rigid pavements created by aman dembla help the. 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. A new version of darwin was released in 1993 along with a revised edition of aashto guide for design of pavement structures 1993 guide aashto, 1993. 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. The baseline rigid pavement design is a three layer jpcp system consisting of a portland cement concrete pcc slab over a nonstabilized graded aggregate base gab layer over subgrade sg.
The design rigid pavement sections for the baseline and poor drainage scenarios are summarized in figure 619. In other words, there must be some assurance that a pavement will perform as intended given. The concrete slab is designed for a compressive strength of 5500 psi. In the rigid pavement design, thickness of the concrete slab is calculated for the various types of rigid pavements.
New flexible pavement design example 1993 aashto pavement design project name and location. The civilweb aashto 1993 pavement design spreadsheet is a complete design solution for the structural design of flexible roads. A simple empirical guide to lowvolume road pavement. Rigid pavement properties 7 e c concrete modulus of elasticity psi k modulus of subgrade reaction psiin concrete modulus of rupture psi s c c. Empirical equations are used to relate observed or measurable phenomena with outcomes. The guide for the mechanisticempirical design of new and rehabilitated pavement structures developed under nchrp project 7a is the stateoftheart procedure for the design of flexible and rigid pavement structures. This is the design thickness used in other calculations an b rigid pavement design based on aashto supplemental guide reference. The new mechanisticempirical pavement design guide mepdg provides a stateoftheart and practice pavement design procedure that eradicates the aashto 1993 empirical design procedure deficiencies. Paveinstruct accompanies pavexpress, a webbased software created to design flexible and rigid pavements using aashto 9398.
The simplified pavement design tool is based upon design equations from the 1993 aashto guide for the design of pavement structures and the 1998 supplement to the aashto guide for the design of pavement structures. Implementation of the aashto pavement design procedures into. Thickness design on flexible pavement aashto 1993 method. Implementation of the aashto pavement design procedures.
Can use load spectra instead of esals computationally intensive. The mepdg was used to check the 1993 aashto guide thicknesses at all esal levels. Introduction to rigid pavement design ced engineering. Aashto pavement design guide empirical design methodology several versions. 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. Design of rigid pavement using aashto method duration.
Aashtos mechanistic empirical pavement design guide. Design of flexible pavement using aashto method youtube. Download flexible pavement design excel calculator free. Again, the poor drainage necessitates a thicker pavement cross section. Nov 23, 20 aashto pavement design guide empirical design methodology several versions. Composite overlay pavement design example 1993 aashto. J analysis unit delineation by cumulative differences. Design of semirigid type of flexible pavements sciencedirect. Chapter 5 of part iii of the 1986 aashto guide for design of pavement structures 1 addresses overlay design. Table 6 summarizes the agency pavement design methods.
1402 468 1334 1414 1370 542 915 1223 762 670 1221 886 876 816 287 563 241 949 359 1550 922 208 814 1268 82 1236 783 1230 1472 439 623 642