Análise comparativa do dimensionamento de pavimentos asfálticos pelo método do DNER e o método mecanístico-empírico MeDiNa em um trecho da BR-101/AL

Abstract

The road mode is the main means of transporting cargo and passengers in Brazil, so its extensive network requires constant maintenance so that the pavements are in good condition for use. Among the main problems presented with flexible pavements, its design mode stands out, as empirical methods have been used for decades that ignore important factors related to Pavement Mechanics. In order to reduce this large amount of empiricism, the study with the Mechanisticempirical method of pavement design emerged. Thus, the present work aimed to analyze and compare the paving project, dimensioned by the DNER method, of a stretch of the BR-101/AL, carrying out a study with the parameters obtained through the DNER method and the MeDiNa software. After the analyses, it was possible to verify that the pavement designed by the DNER method did not reach the expected performance for the 10-year useful life of the pavement and, therefore, it became necessary to carry out studies with other proposals for structures to be designed for the excerpt in question. Among the proposals, it was found that the structure without the binder had the lowest percentage for the cracked area (8.1%) at the end of the design period, resulting in a lower cost among the structures. In addition, it was found that the overweight of 12.5% in the load of commercial axles, this allowed by CONTRAN, resulted in an increase in the order of 50.31% in the number N, resulting in a reduction in 4 and a half years in useful life of two structures proposed throughout this study. Finally, regarding the feasibility of applying the MeDiNa sizing method in the state of Alagoas, it was observed that in the state there are no laboratories with the necessary equipment to obtain the necessary data to apply the method properly, highlighting the need for investments in this sector.