Three-dimensional finite-element pavement-subgrade models are
developed in this study to simulate falling weight deflectometer
(FWD) loading on highway pavements. Reasonably good agreement
is found between FWD deflections measured on selected pavements
and computed dynamic deflections for pavement models subjected
to the FWD load pulse and contact simulation. Effects of loading
force-time history and pavement cracking on the surface deflections
response of an asphalt pavement are also presented. The creep
modulus of asphalt mix is predicted using a micromechanical model
which calculates the viscoelastic response from creep compliance
test results of the binder and elastic properties of the aggregates.