Caracterização de rigidez, deformação permanente, fadiga e análises mecanicistas de pavimentos com misturas asfálticas produzidas em campo e laboratório

Abstract

Offering comfort, durability, economy, agility and safety to users, and consequently society, are purposes that are sought to be achieved when dimensioning or recovering asphalt pavements. In view of this challenge, and seeking to successfully correlate the experimental scenario with the phenomena found in the field, this work sought to evaluate four asphalt mixtures reproduced in the laboratory. The evaluation was carried out by laboratory tests of stiffness, resistance to permanent deformation, fatigue life, and by computer simulations of the MeDiNa program. The laboratory asphalt mixtures are reproduced from the study by Vestena (2021), who evaluated the mixtures machined and applied in the field, in the monitored experimental section, on BR/116, Pelotas - RS. The section studied for the computer simulations is divided into three segments that differ according to the bearing layer. Segment 01, where TLAFlex ligand was used, has the mixture called TLAF. Segment 02, with polymeric asphalt highly modified by SBS (Stylink HiMA, AMP 65/90-E), has the mixture called HIMA and segment 03, where SBS polymeric asphalt (AMP 55/75-E) was used, has the mixture called SBS. The results obtained for the stiffness of the asphalt mixtures machined and reproduced in the laboratory were similar, both by the Resilience Modulus test and the Dynamic Modulus test. The values obtained for FN, related to permanent deformation, were similar for most mixtures, except for the CONV mixture, which is arranged in the binder layer. For the fatigue results, performed by diametral compression, it was also similar when comparing each mixture and its origin. For the simulations of AT(%) estimated by the MeDiNa program, the asphalt mixtures reproduced in the laboratory were similar to the machined asphalt mixtures, differing in 11.11% for segment 01, 9.01% for segment 02 and 17 .74% for segment 03. The differences in fatigue coefficients (k1 and k2) of the asphalt mixtures from each origin did not cause significant changes in the simulations by the MeDiNa program.