Efeito da sobrecarga e condição de aderência entre camadas na previsão de vida útil de pavimentos asfálticos: estudo de caso da BR-116/BA

Abstract

It is a consensus that vehicle axle overloads accelerate the degradation of asphalt pavements, with direct effects on the useful life of these structures. In this context, the present study sought to evaluate the effect of traffic overload on the estimated life of the asphalt pavement of BR-116 / BA through stress-strain analysis, considering different adhesion conditions between pavement layers (adhered and non-adhered) and medium and maximum deflectometric basins from FWD tests. Data from three Homogeneous Segments (SHs) were used, which are part of the highway's duplication and restoration works (km 387.41 to km 427.75) and are known in the pavement reinforcement project phase. The deflectometric data were retroanalyzed with the aid of BackMeDiNa software, divided by resilience were used in the stress-strain analysis in the AEMC software to determine the elastic responses of the structure and, consequently, the thicknesses of the asphalt concrete reinforcement layer required by each SH. The results pointed to useful life functions closely related to the overload percentages tested for the vehicle axles, indicating a decreasing and non-linear relationship between these parameters. On the other hand, although the condition of adhesion between layers did not cause great differences in the reinforcement thicknesses between the SHs, an evaluation of the effect of the overload showed a trend of greater structural impairment of the pavement in the non-adhered condition.