Aplicação do novo método de dimensionamento de pavimentos asfálticos a trechos de uma rodovia federal

Abstract

The research shows the service life of reinforcement and reconstruction solutions for flexible and semi-rigid pavements indicated in the DNIT’s Flexible Pavement Maintenance Solutions Catalog through the mechanistic-empirical dimensioning method MeDiNa. We used 13 stretches of a federal highway with different functional, structural, traffic and climatic conditions. The solutions of the DNIT’s Catalog are foreseen for 10 years of service life. The methods that gave rise to the DNIT’s Catalog, DNER-PRO 11/79 and DNER-PRO 269/94, are focused on maximum deflection. MeDiNa performs the reinforcement design of the pavement structure based on the deformability of the materials, fatigue curve of the reinforcement material and the prediction of cracking, the elasticity modules of the layers being obtained by backcalculation of the deflection basins (BackMeDiNa). It was verified that in 78% of the analyzed cases the solutions indicated by the Catalog didn’t reach the project lifetime. Of these, 84% didn’t reach acceptables conditions at 4 years, with cases of rupture in less than 1 year. The results indicate the importance of considering the elastic characteristics of pavement materials in the face of the stress and deformation conditions due to traffic and climate.