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Deflection basin measurements for the purpose of structural capacity evaluation are a key component of the SHRP's LTPP monitoring program. In the near term, SHRP will apply a backcalculation procedure to these data in order to estimate the in situ elastic moduli of the pavement layer materials. Because a standard method for evaluating the structural capacity of pavements from deflection data does not presently exist, SHRP has undertaken a study to develop a layer moduli backcalculation procedure for use in the initial analysis of the SHRP deflection data. The procedure covers not only the software but also the rules and guidelines used in applying the program. This paper focuses on the standard procedure used to ensure that the LTPP deflection data analysis is as consistent, productive, and straightforward as possible.
backcalculation procedure, backcalculation rules and guidelines, layer moduli backcalculation, deflection testing
Principal engineer, PCS/Law Engineering, Beltsville, MD
Research highway engineer, McLean, VA
Systems analyst, Brent Rauhut Engineering, Inc., Austin, TX