asphalt-rubber; asphalt-rubber pellets; sustainability; rheology; laboratory evaluation.

Among materials used as asphalt binder modifiers, granulated rubber from scrap tires has shown good results in terms of improving resistance to permanent deformation, fatigue cracking and ageing. In addition, it contributes to the improper disposal of waste tires, making effective use of the rubber already used. There are two methods of incorporating crushed tire rubber into asphalt mixtures: dry process and wet process. In the dry way, the rubber grains are introduced into the plant as part of the aggregates. In the wet route, the rubber is previously added to the conventional asphalt binder. Rubber asphalt pellets, the name given to their commercialization in processed form as small pellets, are recent products in the paving market. This configuration facilitates the process of mixing the pellets with binder and mineral aggregates, making the purchase of rubber-asphalt faster, with low emission of pollutants. Therefore, it can be considered a sustainable technology, with the application of recycled rubber, and lower fuel consumption in transport and machining. The objective of this work was to evaluate the behavior of asphalt-rubber binders in the laboratory, using the criteria and tests required by the ASTM 8239/21 specification, in addition to fatigue resistance (LAS), storage stability and gas emission tests (polycyclic hydrocarbons aromatics - HPA). A comparison was made between the rheological properties of a sample of commercial asphalt-rubber AB-08 and the properties of two modifiers (PelletPAVE-Plus and PelletPAV) with CAP 50/70 in the proportions of 20% and 30%, in relation to mass. linker total. The results showed that the properties of binders with pellets are superior to those of CAP , but inferior to those of conventional rubber-asphalt AB-08. Additionally, the analysis of the binders and their fumes generated in the laboratory allowed us to conclude that the binders 50/70+30%PelletPav and 50/70+30% PelletPave-Plus had lower emission levels when compared to the commercial asphalt-rubber AB -08. The product was also tested by composing an asphalt mixture with a Gap-Graded type granulometric curve. In this way, Resilience Modulus (MR) and Tensile Strength (RT) were obtained, but it was not possible to obtain fatigue curves due to product (pellets) deficiency.