Projeto de reforço para o pavimento flexível do anel viário da UFJF baseado no novo método de dimensionamento mecanístico-empírico nacional

Abstract

The procedures of design and reinforcement project for flexible pavements available in Brazil are, mostly, based on empirical models developed from studies carried out in specific localities, and, therefore, should only be used in cases where equivalent climatic and traffic conditions were observed. The national road agencies in partnership with universities and research centers have been working to change this scenario through the development of a mechanistic-empirical method that is more compatible with the Brazilian geographic and technical-scientific realities. The first outcome of this task force is the computer program MeDiNa, which is still under assessment. This program has a transfer function that considers the fatigue damage of asphalt mixtures, allowing the estimation of the percentage of cracked area related to the project period. The present research work uses this program to a reinforcement calculation for the flexible pavement of the Federal University of Juiz de Fora ring road aiming at restoring functional properties and preventing damages to its structure. This pavement is functionally evaluated through Computerized Continuous Visual Survey (CCVS) and longitudinal irregularity test with laser perfilometer, and structurally by means of deflection survey carried out by FWD (falling weight deflectometer) equipment and prospecting procedure. From data collected in the structural evaluation, a backcalculation is executed to obtain required parameters to the concerned calculation. The ring road was divided into 8 homogeneous sections and, after the proper design and results analysis, it was concluded that the best reinforcement solution is the pavement full-length resurfacing using the project asphalt mixture in a single thickness of 5,0 cm, paying attention to the application of a crack relief layer in some sectors.