MOURA, E. Q. R.; MOURA, Ewerton Quirino Ramalho de.
Resumo:
The modification of asphalt binders is a practice that aims to increase the resistance to
permanent deformation, cracks caused by fatigue or thermal variations, improve the conditions
of safety and comfort of the highways and reduce costs with maintenance. In addition, the use
of lignocellulosic materials as asphalt binder modifying agents attracts the attention of
researchers concerned about the limited availability and environmental impact caused by
excessive use of fossil fuels. Therefore, this project aims to analyze the rheological behavior of
modified asphalt binders by adding lignin from Pinus wood, a by-product of the pulp and paper
industry. Rheological characterization tests such as MSCR, LAS and PG for the asphalt binder
modified by additions of 3%, 6% and 9% of lignin extracted from pine were carried out.
Compared to the pure binder the modified binders obtained a higher elastic behavior, increase
of the maximum temperature of use of the conventional binder and greater resistance to
permanent deformation with an increase in the parameter G*/sinδ and non-recoverable
compliance. Proof that the use of lignin confers rheological and environmental benefits when
associated with the conventional binder.
