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The mechanistic analysis for pavement design admit perfect adherence between the layers, which may not occur in the field. In this work, using the ABAQUS finite element program, the effects of the layer interface condition (complete, partial and zero adhesion) on the behavior of pavements are analyzed. The analyzes were carried out for different levels of stiffness of the asphalt material and the estimation of the performance of flexible pavements, in terms of fatigue of the asphaltic and cemented layers and permanent deformation, was based on empiric-mechanistic equations that consider, respectively, the structural responses: horizontal tensile strain at the bottom fiber of the asphalt layers and vertical compressive strain at the top of the subgrade.  The results show that the structural responses are more sensitive to the adhesion condition at the interface between of the two asphalt layers, to which the tack coat contribute the most, than at the second interface. The interface condition affects the fatigue life of the pavement more than the permanent deformation and, in both cases, the consideration of perfect adhesion between the layers results in the prediction of better pavement performance. Therefore, the premature occurrence of distresses may also be related to poor adherence between layers.

Efeito da aderência entre camadas na previsão de desempenho de pavimentos asfálticos