Report Number:īackcalculation, Deflection data, elastic modulus, EVERCALC?, falling weight deflectometer, Long-Term Pavement Performance, LTPP, Mechanistic-Empirical Pavement Design Guide, MODCOMP?, MODTAG?, Modulus, pavement evaluation Link(s): The report also summarizes the results from the production runs to calculate the elastic layered modulus of flexible and rigid pavements (new construction and rehabilitation) as well as demonstrate the application and use of the results. The methods and procedures, including the pre- and post-processing tools, have been automated so the results can be recreated by others not directly involved in development of the tools and procedures. The methods used in production for backcalculating elast layer moduli include a combination of EVERCALC and MODCOMP for all types of pavements and the best fit method for rigid pavements. Multiple packages (including BAKFAA, EVERCALC, MICHBACK, MODULUS, MODCOMP, and the area and best fit methods) were considered and evaluated for estimating layered elastic modulus values on a production basis. Specifically, the report documents the tools, data analyses, elastic layer modulus of the LTPP test sections. This report summarizes all activiites completed to backcalculate the elastic layered modulus from deflection basins measured on all test sections included in the LTPP program. As such, there was a need to revisit the methods used to improve on the results. While the earlier studies focus on the use of nonlinear methods and were considered to have minimal success, some of the methods used have advanced within the past decade. A common use of deflection data is to backcalculate elastic layer modulus values from deflecion basins measured on all LTPP test sections and included those computed values in the LTPP database. Irwin Publication Dateĭeflection data have been measured at periodic intervals with a falling weight deflectometer on all rigid, flexible, semi-rigid, and rehabilitated pavement test sections included in the Long-Term Pavement Performance (LTPP) program. Click to email a link to a friend (Opens in new window).

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Modcomp backcalculation software