The pavement design engineer must integrate this information into the materials design package materials design report, pavement design summary and preliminary pavement structure cost estimate that will provide the necessary documentation and communication of this design process. Rigid pavement as per irc 582002 rigid pavements are generally used in constructing airports and major highways, such as those in the interstate highway system. You will learn the principles of stress and strain analyses in typical highway pavement structures, how to design new and rehabilitated flexible and rigid pavement structures, and how to use various mechanisticempirical methods to conduct pavement analysis. The design of rigid pavements by the westergaard method is still commonly used today for rigid pavements loaded by nonhighway vehicles. The 1993 aashto guide for design of pavement structures and its associated graphs are needed to carry out this procedure because most steps involve.
The 1986 and 1993 pavement design guide editions of the american association of state highway and transportation officials. Recent developments in cement concrete pavement design. Generally there are two methods to design the pavement from cbr california bearing ratio value. The concept of serviceability and serviceability index and its loss during design life of a pavement. Section 5 rigid pavement construction standard specification for urban infrastructure works 52 edition 1, revision 0 september 2002 5. The aashto method of rigid pavement design was developed from performance data of jointed plain concrete pavements jpcp. This is a textbook on the structural analysis and design of highway pavements. Rigid pavement empirical design example design a new rigid pavement for a major interstate highway using the following conditions four lanes each direction. The thickness design of cpcd is detailed in section 2, approved design method, and section 4, rigid pavement.
Westergaard considered the rigid pavement slab as a thin elastic plate resting on soil subgrade. Flexible pavement design by cbr method is used to determine the total thickness of pavement. The design of rigid pavements by westergaard method was the earliest attempt at an analytical solution to the problem of concrete pavements supported by the ground being loaded by wheeled vehicles. The unit weight of concrete is 2400, the coefficient of friction is 1. In this video, you will know how to design a rigid pavement using aashto method and curves to make you available to develop structure. The job of the subcommittee was to adapt the data from the aasho. Flexible pavements see figure, left have base courses of broken stone pieces either compacted into place in the style of mcadam or glued together with bitumen to form asphalt.
Improve the design and performance of your pavement systems and learn how to predict their performance by starting with the fundamentals. It estimates the support of the layers below a rigid pavement surface course the pcc slab. Design of rigid pavements is based on westergaards analysis, where modulus of subgrade reaction, radius of relative stiffness, radius of wheel load distribution are used. The crcp thickness design is detailed in section 2, approved design method, and section 3. Each layer receives loads from the above layer, spreads th. Jointed plain concrete pavement jpcp continuously reinforced concrete pavement crcp pavement design. G student 2professor 3assistant professor 1,2,3department of civil engineering 1,2,3samrat ashok technological institute, vidisha m. There are a few recent developments in the design and use of cement concrete for rigid pavements. For jointed concrete pavements, regardless of whether reinforced or nonreinforced, the aashtoodot method of pavement design calculates the same required. The solution is an iterative process that solves for esals in both equations by varying the slab depth d. Design of rigid pavement by irc method and its critical.
This revision provides pavement design procedures and requirements for the pavement design of roads and parking areas worldwide. How to design plain jointed rigid pavements for highways. 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. Westergaard method for rigid pavement design spreadsheet. For critical design, a combination of load stress, frictional stress and warping stress is considered. The crcp thickness design is detailed in section 2, approved design method, and section 3, rigid pavement design process for crcp. For jointed concrete pavements, regardless of whether reinforced or nonreinforced, the aashtoodot method of pavement design calculates the same. Can use load spectra instead of esals computationally intensive. Cbr method recommended by california state of highways. The following are the trafficrelated factors that govern the design of the pavement. Mccullough respectively, supervising design research engineer and design research engineer, texas highway department this paper verifies and extends certain developments in the aasho interim pavement design guide.
What are the various flexible pavement design methods. Different types of joints are required like expansion and contraction joints. Pavexpress, a webbased pavement scoping tool that simplifies the design of flexible and rigid pavements, is also based on aashto 93. In design, the rigid pavement equation described in this chapter is typically solved simultaneously with the rigid pavement esal equation. State aid flexible pavement design charts using soil factors. Critical condition of stress in the rigid pavement is the maximum flexural stress occurring in the slab due to wheel load and the temperature changes. Texas department of transportation txdot sponsored a study to develop a rigid pavement system in which the lifecycle cost analyses of rigid pavement were performed to rank schemes by total cost of the life cycle. The current aashto method is a regression method based on the results of road tests. Types of pavements flexible pavement rigid pavement. Ufc design method calculate the required design thickness for unreinforced rigidconcrete pavement for parking lots and open storage areas.
Pandey tyre bursting on expressways of rigid pavement 4348. 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. Design of rigid pavement using aashto method youtube. To design the road stretch as a flexible pavement by using different flexible methods like group index method, c. Steel reinforcement and other design details are governed by the crcp standards. Overview of south african mechanistic pavement design method. The 1993 aashto guide for design of pavement structures is the only approved design method for cpcd projects at txdot. The westergaard analysis of rigid pavements for calculating the stresses under loading were developed in the 1920s and 1930s and they still form the basis of many modern design methods. Rigid pavement design of pavements lec14 part1 youtube. This stress transmits to another layer by point to point contact. The design life may be taken as 10 to 20 years for lowtraffic volumes flexible pavements and 20 to 30 years for hightraffic volumes, rigid pavement depending on the designers discretion irc372001 and irc582002. Design 1 fourlane rural inte rstate, dowels, asphalt shoulder 30 28 26 24 22 20 18 16 27,000 77,000 230,000 1,200,000 unlimited 36. Rigid pavements are designed for a period of 3040 years and thickness design of rigid pavements are influenced by traffic loading.
Design of rigid pavement by irc method and its critical comparison with aashto method tanu chaturvedi1 dr. In addition, they commonly serve as heavyduty industrial floor slabs, port and harbor yard pavements, and heavyvehicle park or terminal pavements. Flexible pavement design by semiempirical method is discussed in this article. Properties of rigid pavements components of rigid pavements created by aman dembla help the. Other pavement deterioration mechanisms are also addressed as part of the design process. This design produces a rigid slab thickness in inches required to support the estimated traffic under a selected serviceability interval and estimated support and environmental conditions. 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. Aashto method of flexible pavement design road surface.
By default, the tool uses a layer coefficient a of 0. A flexible pavement structure is typically composed of several layers of materials. Design the length and spacing of tie bars given that the pavement thickness is 20cm and width of the road is 7m with one longitudinal joint. Aastho flexible pavement design method objectives know the factors considered in the aashto design method become familiar with use of tables 20. 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. Pavement system design engineering professional development. Ufc 325001 pavement design for roads and parking areas. This design produces a rigid slab thickness in inches required to support the estimated traffic under a selected serviceability interval and. 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. Introduction to rigid pavement design ced engineering. State of the art and practice in rigid pavement design. Design equations for rigid pavement using the alternate method refer table 20. The analytical design approach allows nonstandard materials and construction types to be considered. The rigid pavements are made of cement concrete either plan, reinforced or prestressed concrete.
Use of the falling weight deflectometer fwd for pavement evaluation has paralleled the introduction of analytical methods into pavement engineering. It clarifies when state pavement design procedures may be used and when pavementtransportation computer assisted structural engineering pcase is required. Rigid pavement design rigid pavements are generally used in constructing airports and major highways, such as those in the interstate highway system. The method of design allows use of conventional as well as stabilized materials in any layer of the pavement, and thickness of each layer is taken from the templates given in indian roads congress irc design code. Subbase thickness10 subbase modulus30,000 psi subgrade m r10,000 psi to get k. This lecture includes following topics design of rigid pavements what are rigid pavements. Rigid pavement analysis and design fhwa us department of. Flexible pavement design by california bearing ratio method.
The westergaard method for rigid pavement design involves a calculation of the stresses acting in the pavement under the wheel load. Determine the midslab tensile stress t at the bottom of the slab. When a flexible pavement is subjected loading, the stress is maximum at the top layer of pavement. 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. Mndot flexible pavement design, rvalue method excel, 0.
Step 1 find the length of the dowel bar embedded in slab ld by equating eq. Rigid pavement empirical design example pavement interactive. Recommendations are made with regard to the characterisation of the pavement materials and the modelling of the pavement behaviour using the sa rehabilitation design method. Roadway design memorandum turnout paving in pm10 nonattainment areas nov. 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. Which is defined as the pressure per unit deflection of the foundations as determined by plate load test the modulus of subgrade reaction k is used as a primary input for rigid pavement design. Calculate proper pavement thickness with free online tool. Road test to use in design procedures for asphaltic concrete pavements and portland cement. Rigid pavement is designed and analyzed by using the elastic theory. Flexible pavements are so named because the total pavement structure deflects, or flexes, under loading.
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