Estudo do comportamento reológico de ligante modificado por lignina proveniente de pinus.

Abstract

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.