SILVA, M. T. R.; http://lattes.cnpq.br/4877349922029242; SILVA, Mila Thais Rezende e.
Résumé:
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.
