LOAD RATING OF LIGHT PAVEMENT STRUCTURES.
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abstract
A new approach to determining the damage that overweight vehicles can do to light pavement structures is described. This procedure uses deflections measured with either the Dynaflect or the falling weight deflectometer to determine the number of passes of a specific load that will cause a critical level of rut depth in a light pavement structure. This method was based on field observations and ILLI-PAVE, a finite element pavement analysis program. In the study, a hyperbolic curve is used to describe both the stress-softening and the stress-hardening form of load deflection characteristics observed on light pavements. A method of determining the nonlinear elastic material properties for the base course and the subgrade using the falling weight deflectometer or the Dynaflect was developed.
