Abstract
This paper performs a study on backcalculation of stiffness of an existing pavement section in I-40 New Mexico and validation by numerical analysis. Falling Weight Deflectometer (FWD) test has been conducted on a section in I-40, New Mexico. Layer stiffness of the pavement has been backcalculated by ELMOD using the FWD test data. Commercial finite element software ABAQUS has been used to develop the Finite Element Model (FEM) of this section. Pavement geometry and layer thickness are collected from field sampling. Resulting surface deflections at the predefined points from this analysis are compared with field FWD deflection values. It shows close agreement between these. Past FWD test data has also been analyzed and found the degradation pattern of the material for the loading and aging. So, the FWD test method is considered to be reliable for evaluating the existent stiffness of pavement material.
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