ABSTRACT
Non-destructive test equipment such as falling weight deflectometer and light weight deflectometer are commonly used to measure pavement responses by recording the deflection of sensors produced by dropping a known load from a known height. Although they have a similar operating principle, few studies have examined the relationships between the devices, addressing light weight deflectometer testing with multiple geophones applied to layered systems. In this study, falling weight and light weight defelectometer tests were performed to establish a correlation between their measurements, and the resulting relationships were used to devise a new pavement deflection basin parameter called Area under Pavement Profile (AUPP) based on the light weight deflectometer measurements. The devised AUPP can be used to predict tensile strain at the bottom of an asphalt layer without performing back-calculation and/or structural modeling. Three-dimensional Finite Element Model (FEM) was developed in the ABAQUS program to validate the results. Comparison of the FEM and the field data shows close agreement.
