Efeito da adição de lignina nas propriedades reológicas de ligantes asfálticos.

Abstract

The road transport system is the main logistical means in Brazil, being responsible for a large part of the transport of all cargo in the territory and locomotion of people. However, despite the country's high degree of dependence on highways, it is notable that a large part of the Brazilian road network presents several types of pathological manifestations, which are due to the unforeseen increase in road loads, lack of preventive maintenance and mandatory materials. Low resistance and durability. Thus, as modifications of asphaltic binders have as main objective, to find additives that mixed with asphalt binders, can increase the resistance of the pavements to deformations caused by mechanical efforts or by thermal variations, also bringing, as a consequence, improvements in the conditions of safety and comfort. For highway users and reduced maintenance costs in short periods of time. In general, this research aims to make a comparison of the rheological properties of asphalt binders modified by the addition of lignin. Special tests were carried out, such as rotational viscosity test and the creep and recovery tests under multiple stresses, which aim to determine the parameters of percentage of recovery and non-recoverable compliance of the asphalt, all before and after short-term aging (RTFO ) It was observed that the ligands modified by the addition of lignin are more resistant to heat dissipation, temperature variation, but mainly to aging, proving that the use of lignin, in general, proved to be viable rheologically, if compared to the ligand conventional. In addition, it may also come to the conclusion that levels of lignin are the most suitable for improving the rates of deformable recovery of asphalt.