Avaliação estrutural e retroanálise em pavimentos com paralelepípedo restaurados com concreto asfáltico no município de Alegrete-RS

Abstract

Among the modes of transport used, the road network is the most used in Brazil, with asphalt concrete being one of the main materials used for the construction of these roads. Thus, paving in the country has been growing rapidly, especially paving in urban roads. However, due to rapid urban growth, these roads that today need to be paved with asphalt to improve flow conditions, rolling and user comfort, were previously paved with parallelepipeds. Therefore, it has become common to apply an asphalt layer directly over the existing paving, as it is a quick solution with lower initial costs. However, the estimated service life for these pavements is low compared to other paving methods, due to the frequent pathologies in this type of pavement. The present study sought, through the use of the Benkelman Beam, to carry out a deflectometric survey on a road in the municipality of Alegrete - RS, executed in parallelepiped, before and after the execution of the restoration of the asphalt coating. In this sense, the BackMeDiNa software was used to carry out the back analysis of the data obtained from the tests with the Benkelman Beam, which presented a satisfactory result in carrying out the readings. After analyzing the results, it was possible to carry out a structural evaluation of all layers of the pavement. By analyzing the radius of curvature of the deflectometric basins, it was verified that the pavement does not have structural conditions in four of the five analyzed points. Thus, after the retroanalysis, the resilience modulus obtained in the pavement layers are consistent with those found in the literature for most of the analyzed points, however the sand layer did not present an adequate modulus to be used in paving. Keywords: Parallelepiped; Benkelman Beam; Crack reflection; Retroanalysis.