![software for backcalculation software for backcalculation](https://www.fhwa.dot.gov/publications/research/infrastructure/pavements/16010/images/fig81.png)
The modulus of the subgrade can be converted into a subgrade R-value. ELMOD Back-calculationĮLMOD is a program operated by personnel at the Office of materials & Road Research that can calculate the modulus of each pavement layer from FWD data.
#Software for backcalculation software
The TONN program may be downloaded from the Pavement Design Software webpage. Estimated GE value of the entire pavement section.The remaining life of the pavement in ESALs.The estimated overlay (if any) required for the road to meet a 10 ton TONN Rating.The recommended Seasonal Load Restriction (SLR) rating (known as the “TONN Rating”).District personnel may then use the TONN Program, and information provided by the District, to calculate: When FWD testing is completed, the District will receive the data as an Excel spreadsheet from the Pavement Design Section. The TONN Program is an Excel spreadsheet that is used by District personnel to automate the TONN Method. The TONN Method applies only to HMA pavements, either on aggregate base or on subgrade. The TONN Method, implemented with the TONN Program, calculates the recommended seasonal load restriction based on pavement deflections collected with a FWD. The following options are available to analyze FWD data. Data AnalysisįWD data may be analyzed several different ways for different purposes. Various computations may be performed on the deflection data to evaluate the pavement and the stiffness of it and its constituent layers. It is a trailer-mounted device that operates by dropping a weight on to the pavement and measuring the resulting pavement deflections. The Falling Weight Deflectometer is a device that is used to evaluate pavement and pavement layer stiffness.