Estudo do comportamento físico de ligantes asfálticos modificados por adição de montmorilonita organofilizada com genamim.

Abstract

As a result of population and economic growth, there is an increase in traffic, loads transported by trucks and pressure on pavements, which lead to their premature deterioration. Consequently, there is the need to search for alternatives to refine the properties of asphalt binders so as to increase the useful life of pavements, with better resistance to permanent deformation and fatigue cracking, as well as improved safety and reduction of maintenance costs. Therefore, in order to meet such needs, studies reporting a positive introduction of nanomaterials in asphalt binders have been carried out. Considering the aforementioned fact, the present research investigated the physical properties of the ACP 50/70 modified by the addition of organophilized nanoclay with genamin, in order to verify the benefits of the modification before and after short term aging. The results of the modified binder were compared to the one of pure binder and to the SBS 55/75 polymer modified binder. For the modification, a mechanical shear mixer was used with nanoclay incorporation at 2, 3, 4 and 5%. Physical tests of Penetration, Softening Point and Rotational Viscosity were then performed. The results of the tests successfully met the standard/recommended limits and indicated a better performance of the samples modified with nanoclay, which presented an increase of the stiffness and the consistency compared to the pure binder. Regarding the results for the SBS 55/75 polymer modified binder, it was observed that the sample modified with nanoclay is less sensitive to aging, has a lower viscosity and, consequently, a lower machining and compacting temperature for asphalt mixtures. Through the results, it can also be inferred that the binder modified with nanoclay at 3% was the one that presented the best results, in which the referred percentage improved its stiffness characteristics without interfering in the workability of the binder.