Aplicação de material fresado em camadas granulares de pavimentos asfálticos

Abstract

The environmental issue has become increasingly pressing, due to the awareness of the use of natural resources and the concern with the destination of the waste generated. In general, the Civil Construction Industry as significant waste generation, especially in the paving area, due to the large extension of the works. In particular, in road restoration or reconstruction works it is often necessary to remove the aged asphalt coating, thus generating a large amount of waste. In this train of thought, this research aims to analyze the behavior and performance of mixtures of lateritic soil with milled asphalt-coated material, here called Reclaimed Asphalt Pavement (RAP), both obtained in the metropolitan region of Goiânia-GO, in mixtures with different rates, for layered applications in granular layers of asphalt pavements. Therefore, the following proportions were evaluated: Mixture 1 (0% RAP; 100% Soil - Reference Mixture), Mixture 2 (25% RAP; 75% Soil), Mixture 3 (50% RAP; 50% Soil), Mixture 4 (75% RAP; 25% Soil). The research methodology included laboratory tests to characterize RAP and the lateritic soil, as well as the analysis of the mechanical performance of the proposed mixtures. Traditional soil characterization tests were performed in order to know its geotechnical characteristics to produce the proposed mixtures. For analysis of the mechanical behavior of the studied mixtures, tests were performed to determine the resilient modulus and permanent deformation. In addition, a simulation of pavement performance using the mechanistic-empirical method was developed using the MeDiNa software, developed according to technical criteria for Brazilian projects. The design was based on the results obtained from the different mixtures, for a secondary collector system road. The results obtained indicated that the addition of RAP to a lateritic soil, to improve the behavior of the material for granular layers of flexible pavement, may prove viable in some proportions. For the material analyzed, the mixture with 25% RAP had the best behavior in terms of the appearance of cracked area and a not significant worsening in terms of permanent deformation when compared to the soil without RAP addition. Finally, it was concluded that the research can contribute with knowledge in the area of transportation infrastructure in relation to the mechanistic parameters of composite mixtures of lateritic soils and RAP, enabling the implementation of solutions that are not only sustainable, but above all, technically satisfactory in the disposal of paving waste in the construction of new layers where there is a shortage of granular materials.