Revision of aashto pavement overlay design procedures. Aashto guide for design of pavement structures 1993. In other words, there must be some assurance that a pavement will perform as intended given variability in such things as construction, environment and materials. While the standards contained in this manual provide a basis for uniform design practice for typical pavement design situations, precise rules which would apply to all possible situations are impossible to give. Performs civil engineering calculations for trafficroad geometry, surveyingearthwork, pavement, concrete floors and unit c download transportation engineering software pavement calculator 2. A sensitivity study of 14 items added to the 1986 aashto guide for design of pavement structures indicated. Implementation of the aashto pavement design procedures. Aashto t190, resistance rvalue and expansion pressure of compacted soils. Even though all pavement design methods, in particular the aashto design, consider the effect of factors such as. Aashtos mechanistic empirical pavement design guide. Elliott the aashto overlay design procedures have been extensively revised to make them easier to understand and use, more adapt able to calibration by local agencies, and more comprehensive. Pavexpress webbased scoping tool eases pavement design based on industry standards, new webbased tool aids in specifying technically sound pavements. American association of state highway and transportation.
It should also be noted that in 2008, aashto released the mechanisticempirical pavement design guide. Pavement design highway users have an increased awareness of pavement quality. The group also participates in numerous workshops and conferences promoting the use of management systems. Nchrp 7a mechanisticempirical design of new and rehabilitated pavement structures, design guide nchrp 7a, trb, 2004. Chapter two mechanisticempirical pavement design guide and. The thicknesses of the different layers are calculated for each set of design requirements. Implementation and proofchecking of mechanisticempirical. Aashto accreditation requires legally accessed standards, either hardcopy or electronic. Once this requirement has been completed and furnished for. This is the design thickness used in other calculations an b rigid pavement design based on aashto supplemental guide reference. Standards, specifications, protocols, methods, and codes.
For flexible pavements, values for s0 typically range between 0. 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. The following links provide information for use by state dots and the roadside safety community in the transition to roadside safety hardware that is compliant with the aashto manual for assessing safety hardware mash, 2016 please note that questions pertaining to mash will be referred to a joint aashtofhwa technical working. The pavement me deflection data analysis and backcalculation tool is a standalone software program that can be used to generate backcalculation inputs from falling weight deflectometer fwd files to the aashto pavement me design software for rehabilitation design. 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.
Calculate proper pavement thickness with free online tool. The 1993 aashto guide for the design of pavement structures and. Pavement calculator pavement design calculator software. By default, the tool uses a layer coefficient a of 0. Aashto issues revised pavement design guide aashto journal. Supplement to the aashto guide for design of pavement structures, part ii, rigid pavement design and rigid pavement joint design, aashto, 1998. Aashto is an international leader in setting technical standards for all phases of highway system development. One of the drawbacks identified by researchers is, when k modulus of subgrade reaction is. The american association of state highway and transportation officials has released a new publication. Implementation of aashtoware pavement me design software for. The accompanying software, aashtoware pavement me design, was released in 2011.
The design process is based on the predictive performance of a pavement section to be designed to predefined parameters identified as failing. Me design supports aashtos mechanisticempirical pavement design guide, interim edition. Select the link to view the chart of recommended municipal pavement standards. 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. The following links provide information for use by state dots and the roadside safety community in the transition to roadside safety hardware that is compliant with the aashto manual for assessing safety hardware mash, 2016. Pavement design software pavexpress pavexpress is a free webbased pavement design tool available for use by local agencies, engineers and architects who need a reliable way to quickly determine the necessary pavement thickness for a given section of roadway or project. Pavement design resources flexible pavements of ohio. The specifications employ the load and resistance factor design lrfd methodology, using factors developed from current statistical knowledge of loads and structural performance. Revision of aashto pavement overlay design procedures kathleen t. This txdotcustomized version of pgsuper is versatile, user friendly, windowsbased software for the design, analysis, and load rating of multispan precastprestressed concrete bridge beamsgirders in accordance with the aashto lrfd bridge design specifications thru the 8th edition, 2017 and by txdot design policies and guidelines. Aashto pavement management guide, 2nd edition tpm toolbox. Aashto standards for any given material or treatment normally require material standards, material test methods, material design practices, and construction guides. Sensitivity study of 1986 aashto guide for design of. Aashto pavement thickness design guide when designing pavement thickness for flexible and rigid pavements, the following considerations should be used.
To assist in the cost effective and efficient design and construction of roadway pavements, njdot presents the following guidance, presentations, web links and examples. Steel reinforcement and other design details are governed by the crcp standards. Some of the ongoing efforts include the aashto provisional standards for measuring pavement smoothness, faulting, and cracking. This revised manual provides an overview of the methodology termed mechanisticempirical or me pavement design. 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 1993 aashto guide for design of pavement structures is the only approved design method for cpcd projects at txdot. All versions of the aashto design guide are empirical design methods based on field. Part i pavement design and mangment principles chapter 1 introduction and background chapter 2 design related project level pavement management chapter 3 economics evaluation of alternative design strategies chapter 4 reliability chapter 5 summary references for part i part ii pavement design procedures for new. The aashto design equations also require specification of the overall standard deviation s0. New aashto pavement preservation standards, explained. The reliability of the 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 aashto, 1993 1. Aashto introduces the new aashtoware project user website, october 23, 2019. Aashtoware pavement me design is the next generation of pavement design software. Roadway design memorandum turnout paving in pm10 nonattainment areas nov. Aashto introduces the new aashtoware project user website. Pdf aashto guide for design of pavement structures 1993. In 2010, adot contracted with applied research associates, inc. It allows compliant concrete pavement designs to be completed in minutes with our unique design analysis tools showing the designer at a glance the optimum concrete pavement thickness.
Pavexpress is a free webbased pavement design tool available for use by local agencies, engineers and architects who need a reliable way to quickly determine the necessary pavement thickness for a given section of roadway or project. Code of federal regulations, title 23, part 626, pavement. Aashtoware pavement me design is a productionready software tool to. Pcc joint spacing shall match the pavement design layout. During the past couple of years, the task force has begun to draft the pavement preservation standards it has developed over the past 10 years for incorporation into aashto standards. Many highway agencies are transitioning from the 1993 aashto pavement design guide to the aashtoware pavement me design pmed. Me design supports aashto s mechanisticempirical pavement design guide, interim edition. The aashto pavement management guide aims to provide strategies and insights for state dots on management of their pavement. Copies of aashto standards can be purchased through the aashto store. The structural overlay design for arizona soda procedure. Sunset planned for 12 months following release of darwinme v2. The aashto guide for design of pavement structures aashto, 1993 is the primary document used to design new and rehabilitated highway pavements.
Aashto serves as a liaison between state departments of transportation and the federal government. The aashto lrfd bridge design specifications are intended for use in the design, evaluation, and rehabilitation of bridges. Pavement design manual recommended design input parameters for 1993 aashto design method. Implementation of the aashto pavement design procedures into. Therefore, users of this document are encouraged to affirm their designs with field verification of the reinforced pavement performance, both in engineering design and. The aashto pavement design guide provides one of the most commonly used methods of rigid pavement design. Pavexpress webbased scoping tool eases pavement design. To help agencies and contractors meet the demand for highquality pavements, napas asphalt pavement magazine regularly provides articles that directly address issues such as mix type selection and statistical specifications pavexpress is a free, webbased tool for the structural. Aashto rigid pavement design spreadsheet civilweb spreadsheets. In the flexible pavement design, the three layers i. Apr 09, 2019 aashtoware pavement me design is a pavement design software, which builds upon the mechanisticempirical pavement design guide, and expands and improves the features in the accompanying prototype computational software. Therefore, users of this document are encouraged to affirm their designs with field verification of the reinforced pavement performance, both in engineering design and economic benefits.
Standards are issued for design, construction of highways and bridges, materials, and many other technical areas. Thus, computed engineering designs and economic benefits are not easily translated to other geosynthetics. The software only asks users for inputs required to create technically sound. Probabilistic design of flexible and rigid pavements using. The crcp thickness design is detailed in section 2, approved design method, and section 3, rigid pavement design process for crcp. Chapter two mechanisticempirical pavement design guide and aashtoware pavement me design software overview. The aashto materials standards contain specifications, test methods, and provisional standards commonly used in the construction of highway facilities.
Initial serviceability index po po is considered to be that psi immediately after the pavement is open. To help agencies and contractors meet the demand for highquality pavements, napas asphalt pavement magazine regularly provides articles that directly address issues such as mix type selection and statistical specifications. Aashtoware pavement me design is a pavement design software, which builds upon the mechanisticempirical pavement design guide, and expands and improves the features in the accompanying prototype computational software. Pavement design is primarily a matter of sound application of acceptable engineering criteria and standards. The civilweb aashto rigid pavement design spreadsheet completes the design of concrete roads or pavements in accordance with aashto 1998. The guide references aashtoware pavement me design. Engineering software texas department of transportation. Chapter two mechanisticempirical pavement design guide. In other words, there must be some assurance that a pavement will perform as intended given.
Each licensee shall designate a primary contact person through whom all support and maintenance will be coordinated with the contractor support team. 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. Approximately 80% of all states use the aashto pavement design procedures, with the majority using the 1993 version. The pavement management group represents the agency in activities related to pavement management systems. Pavement design unit will provide, each prospective pavement designer must have evidence of a grade of c or better in either an undergraduatelevel or graduatelevel pavement design course or equivalent course in pavement design based on aashto methodology. Aashto guide for the design ofpavement structures resilient modulus is the primary material property that is used to characterize the roadbed soil and other structural layers for flexible pavement design in the 1993 aashto guide for the design of pavement structures. Future plans for aashto me pavement design software. Selection of subgrade modulus for aashto flexible pavement design robert p. Applications to rigid pavements were made by kher and darter 6, 7. Aashto provides accredited laboratories with an exclusive discount code to purchase the materials standards at the discounted aashto member price. Based on engineering mechanics that have been validated through extensive road test.