This study shall first evaluate and decide on the most appropriate method(s) for backcalculation of the Long-Term Pavement Performance (LTPP) deflection data for different pavement types. Using the selected method(s), backcalculated moduli and related parameters shall be derived and integrated into the LTPP database.The research shall consist of two phases. The goal of phase I is to evaluate and select appropriate methodology for backcalculation of the LTPP deflection data, covering both flexible and rigid pavement structures. The process shall include literature and LTPP data reviews, and case studies on selected LTPP sections using candidate backcalculation methods. The contractor shall submit an interim report, including a detailed phase II work plan.
The main goal of this study is to select the appropriate methods and perform backcalculation of all the deflection data in the current Long-Term Pavement Performance (LTPP) database for flexible, rigid, and composite pavement sections.