Utilização de resíduos de polietileno de alta densidade (PEAD) para coloração de misturas asfálticas.

Abstract

Concern for the environment has become increasingly evident in recent years, knowing that one of the main environmental problems found in urban centers is associated with the urban heat island phenomenon, which presents as one of the great villains the asphalt pavements precisely because they occupy a high surface area in cities and have a dark color. In view of this environmental problem, a way to obtain cooler paved surfaces under the incidence of solar radiation is increasing the albedo of the same, through the coloring of asphalt surfaces, for this, it is suggested, the use of materials that absorb less heat, in this case, the use of lighter surfaces, obtained through the coloring of asphalt pavements, with lighter colors, which are capable of actually reflect sunlight. Thus, the objective of this work is to investigate the potential of using of HDPE residues for coloring asphalt mixtures, with a view to minimizing the ICU phenomenon, due to the high reflectance of HDPE colors, in addition to verifying the behavior rheological and mechanical analysis of modified asphalt mixtures with these residues. with a view to To meet this objective, the research was structured in two main strands: first, mechanical characterization of asphalt mixtures with the incorporation of HDPE, and second, to verify the use of HDPE in the coating layer and its contribution to the reduction of surface temperature and increased reflectivity compared to conventional pavements dark in color. The mechanical results indicated the technical feasibility of incorporating the HDPE the mixture, comparing the results obtained for the conventional mixtures, the modified stood out in 7.14% in terms of tensile strength, 18.1% in terms of resilience, 14% in the deleterious behavior of water and 129% in permanent deformation. As for the use of HDPE for coloring, this one proved to be satisfactory, the solar reflectance tests showed that the colored asphalt mixtures stood out against the asphalt mixtures without the granulate of HDPE. Field temperature tests showed that colored asphalt mixtures reach temperatures up to 3.5 °C lower than mixtures without HDPE, thus showing the possibility of using HDPE on the surfaces of asphalt mixtures as a collaborating agent for ICU reduction.