Determine the reinforced design of a flexible pavement for an area located in the. Design three types of highways, all main roads but with different traffic loads. Best practices handbook on asphalt pavement maintenance. Traffic inputs were developed for both the caltrans mechanisticempirical pavement design calme and the national cooperative highway research program nchrp mechanisticempirical pavement. The base layer shall be asphalt, asphalt treated material or crushed gravel or rock. However, caltrans recommends the comparison of pavement. The goal of the mechanisticempirical pavement design guide mepdg is to identify the physical causes of stresses in pavement structures and. Properties of flexible pavement components of flexible pavement explaining the components of flexible pavement next lecture. Revision of aashto pavement overlay design procedures kathleen t. Surface shall be hot mix asphalt or asphalt treated material. The most common flexible pavement distresses are cracking, roughness, weathering, raveling, rutting and bleeding. Highway design manual change transmittals are posted by change date and include a.
Flexible pavement empirical design example pavement interactive. Cbr method recommended by california state of highways. Pervious pavement is designed primarily to promote stormwater infiltration and improve the quality of stormwater runoff. This report compares the caltrans and aashto pavement thickness design procedures. This project will consist of the construction of a new flexible pavement to extend route. Materials investigation and selection information 1. 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. This task is part of a larger project, begun in 1999, to help caltrans implement mechanistic empirical me procedures. Robbins assistant research professor national center for asphalt technology dr. Flexible pavement design state of the practice ncat report 14.
But the design methodology has taken rapid strides towards rationality in the past few decades based on an understanding of the stresses and strains in the layers constituting the pavement and application of the concept of reliability in achieving the desired level of service during the pavements design life. Flexible pavement design for flexible pavements street structural section f. Office of design florida department of transportation. 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. For flexible pavement designs, fps19w texas flexible pavement design system windows or aashto design procedure, darwin 3. Flexible pavement empirical design example pavement. It also presents a plan for an improved pavement design method based on mechanisticempirical procedures. Pdf calme, a mechanisticempirical program to analyze. Flexible overlay pavement design example 1993 aashto pavement design project name and location. The materials generally require lower strength properties with increasing depth, because the stresses reduce as the. Over 200 test sections jpcp 15spacing and jrpc 40spacing range of slab thickness. 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. It is typically designed to capture rainfall on the pavement surface area, but may also accept runon from adjacent impervious areas and other hardscapes sidewalks, rooftops, or gutters.
April 27, 2009 mndot pavement design examples example no. Pavement design manual montana department of transportation. Estimates of the potential traffic include approximately. 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. This report compared the california department of transportation caltrans and american association of state highway and transportation officials aashto pavement thickness design procedures. For example, the california department of transportation caltrans. Introduction empirical design based on the aasho road test. Traffic conditions, climate, geology, materials, construction, and economics are variables that demand the fullest application of professional. Revision of aashto pavement overlay design procedures. Calme, a mechanisticempirical program to analyze and design. What is the computer program that i can use for flexible pavement design.
Before implementing the mechanistic empirical pavement design guide. Sample rigid pavement design tables based on version 0. New flexible pavement design example 1993 aashto pavement design project name and location. Information necessary to design a new flexible pavement, or develop a properly engineered rehabilitation project. Scm evaluation feb 10, 2011, 44kb, msexcel this spreadsheet tool is. The california bearing ratio cbr value of the subgrade soil was the basis for the method of design of flexible pavements, developed originally by the california state highway department, and adopted by the road research laboratory, london, for developing their own design procedure and design charts.
Flexible pavement design by semiempirical method is discussed in this article. It is not intended as definitive treatise, and it does not encompass the design of flexible pavements. Work can be verified by using the flexible pavement structural design utility. Engineers are cautioned that much of pavement design is governed by codes, specifications and practices of.
Design of flexible pavement by semi empirical method. It summarizes the 2015 pavement condition survey on the entire caltrans network. Engineers are cautioned that much of pavement design is governed by codes, specifications and practices of public agencies. This project will consist of the construction of a flexible overlay of an existing flexible pavement to extend. The damage could also be attributed to poor drainage, inadequate design and improper pavement materials used. First, the subgrade upon which the pavement is placed will have a large impact on structural design. Pavement design methods consider two different types of pavement. The roads shall all be designed on the same subgrade. Brasfield and gorrie professor of civil engineering principal investigator dr.
Consistent with the 1993 aashto design, the baseline flexible pavement structure for the nchrp 7a design methodology is a threelayer new construction consisting of an asphalt concrete ac surface layer over a nonstabilized graded aggregate base gab layer over subgrade sg. The goal of the mechanisticempirical pavement design guide mepdg is to identify the physical causes of stresses in pavement structures and calibrate them with observed pavement performance. Cee 3604 transportation engineering pavement design. This technical memorandum describes a design of a sample catalog for rigid pavement as requested by the caltrans division of design in 2005. Common types of flexible pavement include hot mix asphalt hma, rubberized hot mix asphaltgap graded rhmag, and open graded friction course ogfc. Flexible pavement sections consist of 102 mm and 178 mm of ac surface on a 102 and 305 mm thick densegraded untreated granular base respectively. Flexible overlay pavement design example 1993 aashto. This paper describes the process of developing an effective flexible pavement design system, based on the authors experience from development of the flexible pavement design system known as. Introduction to rigid pavement design ced engineering. Pavement management publications issued by the state roadway design office which includes rigid pavement design manual, pavement type selection manual and the flexible pavement design manual. Mdt surfacing design guide chapter 4 mdts pavement design overview january 2015 7 chapter 4 mdts pavement design overview effective pavement design is an important element of the overall roadway project design. First, the location of the road indicates that the road will be in flat terrain. When designing pavements both mix design and structural design, there are three fundamental external design parameters to consider. Flexible pavement design by cbr method is used to determine the total thickness of pavement.
Mdt surfacing design guide table of contents january 2015 i. A rural twolane collector highway containing 6 ft 1. Christos drakos university of florida topic 10 aashto rigid pavement design 1. 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. 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. Caltrans highway design manual shall be used to determine this based on the design speed. This stress transmits to another layer by point to point contact.
It is not possible to formulate one set of design criteria that could meet the requirements of every road everywhere. Flexible pavements spread the surface applied loads to the underlying layers by load distribution. Implementation of the current version of the hdm shall be applied to ongoing projects in accordance with hdm index 82. When a flexible pavement is subjected loading, the stress is maximum at the top layer of pavement. Flexible overlay pavement design example 1993 aashto pavement. The engineering design of flexible pavement structures is not an exact science.
Brick industry association flexible vehicular brick paving. Acknowledgments this report is prepared by the california department of transportation, division of maintenance, pavement program, office of planning and programming and office of pavement management and performance. This is an introduction to rigid pavement design for engineers. If the distresses identified in a pavement are related to structural deficiencies, the pavement section is most likely not a candidate for preventive maintenance treatment, and should be scheduled for rehabilitation or reconstruction. Caltrans i8 concrete overlay american concrete pavement. Transportation caltrans, which have been modified to accommodate idaho conditions. Webbased calacweb and calfpweb for flexible pavement thickness design. Generally there are two methods to design the pavement from cbr california bearing ratio value. Design of pavements has been based on experience and judgment in the past. Survey and evaluation of flexible pavement failures.
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. May 02, 2017 ce588 spring 2017 this video was produced with a swivl. An empirical analysis of flexible pavement design can be done with or with out a soil strength test. There are various methods of flexible pavement design such as empirical and semiempirical methods. This design manual addresses methods to properly develop a rehabilitation project, pavement milling, and the computations necessary for the pavement design process. Aashto pavement thickness design guide when designing pavement thickness for flexible and rigid pavements, the following considerations should be used. Report all test data necessary to each method of design on the soils evaluation for flexible pavement, form itd808 figures 510. Factors afeccting pavement design pavement design must consider the present conditions in the site which influence in the quality of the materials and the geometry. New flexible pavement design example 1993 aashto pavement. Implementation statement the results of the analyses presented in this report indicate that the gravel factors for asphalt concrete included in the current caltrans flexible pavement design method should be reevaluated. Flexible pavement design by semiempirical method is discussed. Highway design manual change transmittals are posted by change date and include a summary of the significant changes. Outline pavement purpose, pavement significance, pavement condition, pavement types flexible and rigid, pavement design, examples,load support,drainage.
Rigid pavement empirical design example pavement interactive. Antonis michael frederick university notes courtesy of dr. Flexible pavement design by california bearing ratio method. Design a new flexible pavement for a major interstate highway using the following conditions four lanes each direction. Ce588 spring 2017 this video was produced with a swivl. These failures might have been caused by fatigue failure on pavement structure due to the movement of heavily loaded trucktrailers. Assume 80% of the loading occurs in the design lane. The design of pavement structural sections should be based on a thorough investigation of site specific conditions, projected traffic, conservation of materials and life cycle economics.
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