FERREIRO, A. A.; FERREIRO, Adriana Albuquerque.
Resumen:
In the last decades, the significant increase of the traffic in the paved roads has accelerated
the deterioration of the asphaltic coverings. Because of this, the use of additives has been
studied to modify the properties of the asphalt binder, in order to improve the service
performance mainly related to permanent deformations and fatigue life. This work proposes
to evaluate changes in the physical and rheological CAP50/70 properties modified with
fractionated hydrated lime particles, from the use of a ball mill. For that purpose,
conventional tests were performed (penetration, rotational viscosity and softening point) and
in the dynamic shear rheometer (DSR). The mixtures were performed with the addition of
lime fractions at 3%, 5 % and 7% by mass of the pure binder. The results in the empirical
tests, both the pure binder and the modified binder have met the recommended limits by the
ANP and DNIT. The modified samples showed a lower loss of mass in the short term aging,
showing an antioxidante alternative. In addition, it was found that the modified binders
increase of the G* (stiffness parameter) and, consequently, of the maximum of Performance
Grade (PG), allowing the use of binders studied at higher temperatures, increased rigidity,
enabling the use of binders studied at higher temperatures. The modified binder with 5%
content of hydrated lime presented better results in the permanent deformation tests. Finally,
it was possible to established that the fractional particles of hydrated lime addition to the
CAP 50/70 is a feasible and effective technique that meets the requirements DNIT for use in
paving.
