A Mechanistic Method for Evaluation of Layer Moduli and Overlay Design. The improper interface condition of the binder-stabilized base layer has little influence on moduli of asphalt and subgrade layer. Backcalculation of Layer Moduli from Nondestructive Pavement Deflection Data Using the Expert System Approach.
#BACKCALCULATION OF LAYER MODULI FULL#
The analysis results demonstrate that assuming full bonding, instead of actual interface conditions of asphalt-stabilized base layer, moduli of stabilized base layers is underestimated, up to 2.5 times smaller than the original values. Finally, the backcalculated layer moduli and the original moduli values were compared. to predict the layer moduli using backcalculation process based on deflection data measured by LWD tests. Linear elastic response assumptions are valid when there is no discontinuity, for example at joints in rigid pavements, or. Classical pavement-subgrade system analysis is based on multi-layer linear elastic analysis, infinite pavement layer dimensions and a semi-infinite subgrade. Secondly, different friction coefficient values between asphalt layer and stabilized base layer were introduced into dynamic finite element model, accordingly, deflection basin parameters were calculated and layer moduli are determined based on the established regression functions. BACKCALCULATION OF LAYER MODULI, STATIC AND DYNAMIC FEATURES. Then, the regression functions between deflections basin parameters and layer moduli were created and used to backcalculate layer moduli. Firstly, according to the full bonding hypothesis, a dynamic finite element analysis model was established to generate a synthetic surface deflection database of the semi-rigid asphalt pavements. In the near term, SHRP will apply a backcalculation procedure to these deflection data in order to estimate the in situ elastic moduli of the pavement layer materials. The objective of this study was to analyze the errors in layer moduli backcalculation due to modeling of layer interface condition. To make appropriate rehabilitation decisions, determining structural layer moduli of the existing semi-rigid asphalt pavements is a crucial task for highway engineers.
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