Ability to process a file in a batch mode can process any number of deflection records at a time exports batch calculation results into. Hwa provides data and engineering services for the design of pcc, hma and permeable pavement systems for residential, industrial, and airport use. A falling weight deflectometer fwd is a testing device used by civil engineers to evaluate the physical properties of pavement. Measured deflections are translated into stresses or strains by backcalculating the pavement structure. Pavement properties are backcalculated from the observed dynamic response of the pavement surface to an impulse load the falling weight. The importance in supplying safe and stable equipment and the newest technology forms the basis of the fwd equipment. More accurate modulus backcalculation by reducing noise. Newly added with this version is jointed plain concrete overlay designs for all six types bonded on ashpalt, unbonded on asphalt, bonded on concrete, unbonded on concrete, bonded on composite, unbonded on compsosite. Flexible pavement evaluation by falling weight deflectometer.
Falling weight deflectomewter is a apparatus used for pavement evaluation civil engineering. The disadvantage of the fwd method is that its results are often dependent on such factors as the particular model of tester used, the specific testing procedure, and the method of back calculation. Calculation of design traffic for new pavement and overlay design. Project traffic is indicated in terms of million standard axles. Eliback for rigid pavement, and issem4, modcomp3, modulus and wdef for flexible pavements. Utilizing the latest research provided by the heavy vehicle simulator and based on 35 years of worldwide consultancy experience, elmod is unparalleled at modeling pavement. Can someone suggest the software for back calculation of. To alleviate this limitation, this paper focuses on the recent development of a systematic backcalculation protocol for subgrade resilient modulus using modcomp6 software. The layer modulus is preferably acquired by backcalculation using measured deflections. Systematic backcalculation protocol and prediction of. Aashtoware pavement me design is a productionready software tool to support the daytoday operations of public and private pavement engineers. Collection and interpretation of pavement structural.
The program create and saves the loading data and materials data files in temporary files so that they will be called back later on for the calculation process of the pavement responses. The noise in insitu measured asphalt pavement deflection basin is the primary cause for the difference between the theoretical deflection basin in backcalculating software and measured basin, which affects the accuracy of the modulus backcalculation. All iroads software is available either as locally installed desktop, server software, or can be provided as a software as a service hosted solution. Backcalculation takes a measured surface deflection and attempts to match it to within some tolerable error with a calculated surface deflection generated from an identical pavement structure using. Oct 11, 2019 the algorithm suitable for the determination of pavement layer moduli from pavement surface deflection is detailed and described in the report based on previously used back calculation methods. Bituminous testing spreadsheet version 2, xlsm 400 kb if you have data in a version 1 spreadsheet and would like it updated to version 2, contact bruce.
In this project for flexible pavement design only commercial. Iowas intelligent pavement backcalculation software by. The use of the back calculation software in a batch mode for evaluating and analyzing deflection measurements from the ltpp database is an extremely important factor. The tonn program may be downloaded from the pavement design software webpage. Ac 150537011b, use of nondestructive testing in the.
This is a proprietary aashtoware computer software product. To alleviate this limitation, this paper focuses on the recent development of a systematic back calculation protocol for subgrade resilient modulus using modcomp6 software. The software is written using modern windows programming languages with this version being developed for the windows 98. One of the more common methods for analysis of deflection data is to back calculate the elastic properties for each layer and provide the elastic layer modulus that are typically used for pavement evaluation and rehabilitation design. Iowas intelligent pavement backcalculation software. Development of a static back calculation software and its application to maintenance of flexible pavement structures. Campus students are required to use it for their design activities.
Aashtoware pavement me design is a productionready software tool to support the daytoday operations. Pavement designanalysis software university of idaho. Backcalculation is a mechanistic evaluation of pavement surface deflection basins. The use of the backcalculation software in a batch mode for evaluating and analyzing deflection measurements from the ltpp database is an extremely important factor. Net application compatible with all existing versions of. Ability to switch application interface between english and metric. It calculates pavement responses stresses, strains, and deflections and combines them with other pavement, traffic, climate, and materials parameters to predict the progression of key pavement.
The iowa department of transportation dot has been collecting falling weight deflectometer fwd data on a regular basis. Calculation of revised thicknesses based on the kgp back software results. Using deflection data and other pertinent information obtained from shrp pavement test sections, the selected software was exercised by a group of evaluators which included the program developers. The condition of the pavement is deduced from the response in terms of vertical displacements due to the impact of an fwd load, simulating actual traffic loads. The project further developed the algorithm by adding optional features for the subgrade layer moduli and the sublayering process for granular layers. Interactive data exchange applications we develop interactive data exchange applications ideas for many clients, including local and state transportation agencies and commercial service airports. Performs civil engineering calculations for trafficroad geometry, surveyingearthwork, pavement, concrete floors and unit c download transportation engineering software pavement calculator 2. Fwd data is primarily used to estimate pavement structural capacity for 1 overlay design and 2 to determine if a pavement is being overloaded. Use of nondestructive testing in the evaluation of airport pavements date.
Backcalculation is a mechanistic evaluation of pavement surface deflection basins generated by various pavement deflection devices. The pavement toolkit is extensively configurable, allowing each users specific survey and, treatment regimes, lifecycle plans, service levels and local priority factors to be modelled. The manufacturers of fwds can supply own backcalculation softwares. Abatechs software for backanalysis of fwd deflection data collected from various types of. In this paper, as a way to introduce structural evaluation during decision making, development of a static backcalculation computer program called balm back analysis for layer moduli and its application to pavement maintenance is introduced. Daps deflection analysis of pavement structures abatech. New methods of using pavement deflection data were developed in the context of pavement structural rehabilitation treatment design. Falling weight deflectometer fwd mndot pavement design. Backcalculation of layer parameters for ltpp test sections. Usually, the 3dmove analysis software creates many data files such as loading file, materials files, input files and output files.
This advisory circular ac focuses on nondestructive testing ndt equipment that measures pavement surface deflections after applying a static or dynamic load to the pavement. These two parameters are backcalculated using the load and deflection data on the surface of the pavements measured by falling weight deflectometer fwd. Stand alone software version of the pavement design portion of the ce calc website. The back calculation is a userdependent procedure and produces a nonunique resilient modulus estimation. We can provide customized training to your agency on all aspects of pavement management, from software use to the overall pavement management strategy. However, files generated from the equipment can be applied in any other backcalculation program. By con trast, backcalculation uses forward calculation iteratively, together with numerical methods to assist with convergence, to a back outa the pavement layer moduli from measured sur face deflections. It should be understood that many different software packages can be used to calculate the elastic modulus of pavement layers and subgrade soils from deflection basins, as demonstrated in report fhward97086, back calculation of layer moduli of ltpp gps sites. Although the fwd approach is considered a preferred nondestructive testing method that offers many advantages over laboratory m r testing, especially with its lower cost and higher testing efficiency, its key limitation lies in the back calculation process. However, the pavement layer moduli backcalculation techniques used so far have been cumbersome and time consuming. Calback is a sophisticated back calculation program that contains specific features pertinent to california and is designed to work standalone, or in concert with calme. Measured deflections are translated into stresses or strains by back calculating the pavement structure. A sophisticated software available for research groups for analysis of complex pavement interactions.
Numerical modelling of pavement flexible and rigid structural responses system optimization static and dynamic back calculation analyses with the focus on pavement engineering applications software development for pavement design, evaluation and analysis. Pavement engineering article university of pretoria. Pavement cost calculator sheet xls civil engineering program. The conventional dynamic backcalculation software dbalm has been used for estimating material parameters of mulilayer pavement such as youngs modulus and damping coefficient.
Hwa offers nondestructive pavement evaluation, subgrade assessment and moduli back calculation. Daps deflection analysis of pavement structures is a rapid, accurate and reliable method for performing back calculation of deflection results. Abatechs software for back analysis of fwd deflection data collected from various types of falling weight deflectometers. Researchers at iowa state university isu have developed a suite of advanced pavement layer moduli backcalculation models using the artificial neural.
Advanced tools such as monte carlo simulation and finite elements can enhance the depth and scope of pavement analysis and design calculations. Can someone suggest the software for back calculation of falling weight deflectometer observations. The disadvantage of the fwd method is that its results are often dependent on such factors as the particular model of tester used, the specific testing procedure, and the method of backcalculation. Index backcalculation of layer parameters for ltpp test. The rosy design, a backcalculation software for both road andor airport data analysis.
Numerical modelling of pavement flexible and rigid structural responses system optimization static and dynamic backcalculation analyses with the focus on pavement engineering applications software development for pavement design, evaluation and analysis. Can someone suggest the software for back calculation of falling. Although the fwd approach is considered a preferred nondestructive testing method that offers many advantages over laboratory m r testing, especially with its lower cost and higher testing efficiency, its key limitation lies in the backcalculation process. Net environment runs under windows xp, vista and win 7 2.
Rubicon toolbox is a suite of tools that can greatly increase the productivity of engineers involved with pavement rehabilitation design. Falling weight deflectomewter is a apparatus used for pavement evaluation. The pcn module is used to rate the strength of airport pavements based on results from the elmod backcalculation procedure. Local streets residential local streets non residential collector streets residential colle. Pavement properties are back calculated from the observed dynamic response of the pavement surface to an impulse load the falling weight. Roadway pavement management applied pavement technology.
Iowas intelligent pavement backcalculation software geo. Sudhakar reddy, department of civil engineering, iit kharagpur. Bakfaa is the faa software to perform backcalculation of pavement material properties using heavy weight deflectometerfalling weight. Calback is a sophisticated backcalculation program that contains specific features pertinent to california and is designed to work standalone, or in concert with calme. Nov 19, 2008 lecture series on introduction to transportation engineering by prof. The backcalculation is a userdependent procedure and produces a nonunique resilient modulus estimation. Aashtoware pavement me design is the next generation of pavement design software, which builds upon the nchrp mechanisticempirical pavement design guide, and expands and improves the features of the original prototype computational software. Development of a static backcalculation software and its application to maintenance of flexible pavement structures. Daps deflection analysis of pavement structures is a rapid, accurate and reliable method for performing backcalculation of deflection results. Development of method for backcalculation to estimate. Calme is a me design program for flexible pavements that parallels the nchrp 7a mepdg and is calibrated for california conditions. There are hundreds of deflection basins to be analyzed on a persite basis, considering the different drop heights, the number of test points along a seasonal and gpssps project.
Itech provides well established courses in pavement structural design for a good use of alize software. One of the more common methods for analysis of deflection data is to backcalculate the elastic properties for each layer and provide the elastic layer modulus that are typically used for pavement evaluation and rehabilitation design. The first was to assess the potential use of traffic speed deflectometer tsd deflection for the design of pavement structural treatments. Deflection analysis of pavement structures for fwd data.
The software is written using modern windows programming languages with this version being developed for the windows 98 operating system. The rosy design, a back calculation software for both road andor airport data analysis. Lecture series on introduction to transportation engineering by prof. Backcalculation of layer stiffness from deflection data using the singular value decomposition technique.
Falling weight deflectometer, fwd, pavement evaluation. Pavement cost calculator sheet xls web share 20160719t18. However, files generated from the equipment can be applied in any other back calculation program. Streetpave 12 is the latest in jointed plain concrete pavement thickness design. Roadway pavement management applied pavement technology, inc. Apart from this, in view of the discussions presented above, the present study was taken up with the following objectives.
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