SENSITIVITY OF BACKCALCULTATION ANALYSIS TO TEMPERATURE IN RECYCLED PAVEMENT IN COMPARISON WITH LABORATORY

Falling weight deflectometer (FWD) and ground penetrating radar (GPR) tests were performed in a section of Damghan-Semnan highway after rehabilitating with cold in-place recycling. The results of FWD test are mostly related to asphalt layer temperature. Therefore, the main objective of this study was to investigate the sensitivity of backcalculated moduli to temperature. The sensitivity of recycled layer to temperature variations was also considered.The bitumen emulsion incorporated in recycled layer can increase the sensitivity of this layer to temperature. Backcalculation analysis was accomplished using ELMOD program. Furthermore, a new method was proposed for backcalculation analysis based on previously proved theories. Results of destructive tests were used to validate the backcalculation analusis outcomes.