Estudo de misturas asfálticas com adição de cascalho de poços de perfuração.

Abstract

One of the byproducts of the oil industry that is disposed of in nature in the form of waste is oil drilling cuttings (oily waste (OR) from oil exploration and production activities). These are rock fragments displaced by the drill and carried by the drilling fluid in the act of drilling an oil well. When improperly disposed of in the environment, the waste generated during oil well drilling operations pollutes the soil, deteriorates the urban landscape, and constitutes an environmental liability if sent to landfills without prior treatment. As a way to reuse RO, in this research, it was proposed its use as a filler in asphalt mixtures. This work aimed to evaluate the mechanical behavior of asphalt mixtures with the addition of gravel from drilling wells, aiming at its application in asphalt road coatings. To achieve the research objective, an experimental program was developed in two stages: mechanical analysis and rheological analysis. To perform the mechanical analysis, the SUPERPAVE methodology was used for dosing the asphalt mixtures, with the content of 2% of lime determined through this and replaced totally (use of 2% of RO) and partially (use of 1% of RO + 1 % of lime), thus being possible to perform the mechanical analysis through the Tensile Strength (RT), Lottman test, Resilience Module (MR), Flow Number (FN) and Dynamic Module (MD) tests. For rheological analysis, the asphalt mastic was formed in three contents 2% RO, 1% RO + 1% lime, 2% lime, compared to pure CAP 50/70. The mechanical results indicate that it is possible to use RO as a filler in asphalt mixtures since its use does not compromise their mechanical strength. The rheological results indicate that the incorporation of RO in the binder increases the viscosity and the complex modulus, however, it reduces the damage resistance. Therefore, the behavior of the asphalt mastic from the incorporation of RO presents a lower susceptibility to thermal variation, and consequently, an increase in the resistance to permanent deformation, however, it presents a shorter fatigue life.