Estudo das propriedades mecânicas de misturas asfálticas modificadas com adição de óleo de cozinha residual.

Abstract

The search for new technologies in asphalt pavements that provide a reduction of the environmental impacts boosted the study of Warm Asphalt Mixtures. This type of asphalt mix is produced and applied at lower temperatures than hotblended mixtures, and because of this, they promote benefits related to reducing the emission of pollutants into the atmosphere and lower energy costs. The modification of the asphalt binder from the incorporation of oleaginous additives is an alternative in the search for the reduction of the machining temperatures and application of the asphalt mixtures, provided by the reduction of the viscosity of the binder. Residual cooking oil when improperly used also damages the environment. Therefore, the present research has the purpose of evaluating the influence of the addition of 1% of the residual cooking oil to the 50/70 asphalt oil cement. For this, the mechanical properties of the asphalt mixtures were evaluated through the Diametral Compression, Resilience Modulus, Modified Lottman and Flow Number tests. The samples of the asphalt mixtures analyzed were machined and compacted at the temperatures determined from the rotational viscosity test, as well as at 10 ° C and 20 ° C below these, as a way to verify the effect of higher temperature reductions on the mechanical parameters. The results indicated that the incorporation of the oil to the binder provided increased tensile strength and resistance to permanent deformation. However, the decrease in temperature caused a reduction of these parameters and a decrease in the stiffness of the mixtures. Nevertheless, these analyzed properties met the requirements required for pavement performance. Regarding damage due to induced humidity, modified asphalt mixtures produced below the design temperature indicated higher tensile strength (RRT), suggesting a probable benefit promoted by the addition of the oil and reduction of design temperatures. The analysis of the results allowed to conclude that the modification presented satisfactory results regarding the mechanical performance of the pavement at lower temperatures than the project and suggested a suitable destination for the residual cooking oil.