Avaliação superficial de pavimentos, usando o método IGG (Índice de Gravidade Global): um estudo de caso na Av. Anhanguera, em Goiânia, Goiás

Abstract

Bus-only lanes are used throughout Brazil to improve the operation of the public transit system. These exclusive lanes are very much in demand for vehicle loading. Asphalt coating deteriorates over time, mainly due to heavy vehicle traffic and weather conditions. Thus, over time, pathologies of various types emerge that negatively impact track rolling conditions. Objective surface assessment of flexible and semi-rigid pavements establishes the parameters for the application of the IGG method, Global Gravity Index. This method aims to arrive at a numerical value for the condition of the pavement whose index varies from 0 (optimal) to 160 (very poor). IGG assesses the occurrence of defects in the sections analyzed. It is a combined failure index that allows us to classify a homogeneous section of pavement, due to the occurrence of surface defects, assigning a concept of pavement condition according to the value found. The pavement condition assessment establishes other possible application methods, and in this work we chose the IGG. Seeking the evaluation of a pavement of a certain stretch of road, the present work was applied in an extension of an exclusive bus lane, in Anhanguera Avenue, Goiânia, Goiás. It was necessary to describe the types of defects that occur in the and, as a consequence, the methods of restoration of these asphalt coatings. By dividing the stretch into lanes 1 and 2 and also into sections, the defects were surveyed as indicated by the chosen method. Having these data it was possible to reach the IGG value and thus, through the decision trees, know what types of maintenance are needed on the road. The method pointed to a poor condition of both rolling ranges. Significant defects such as longitudinal, transverse, interconnected “alligator skin” cracks, wheel track sinking, patches, pans and slippery coating have been found in the section under study. The road needs urgent repairs such as patches, crack sealing, resurfacing and rebuilding some sections, so the work indicates these types of maintenance that can be applied to the road