Comparativo das propriedades físicas e reológica empírica do ligante asfáltico modificado por adição de lignina.

Abstract

The modification of asphalt binders has the purpose of increasing its resistance to permanent deformations, cracks caused by fatigue or by thermal variations, in addition to, consequently, improving the safety and comfort conditions of the roads and reducing maintenance costs. As lignin is a natural polymer, a by-product of the paper and cellulose industry, and which has already shown great potential in some researches due to its association with the asphalt binder, mainly because it has antioxidant properties, this research aimed to verify the effect of addition of lignin in the contents of 3%, 6% and 9% in the physical and rheological properties of the asphalt binder CAP 50/70, and as a type of lignin, the lignin removed from the wood Pinus, Eucalyptus and modified Eucalyptus was selected, the latter being resulting from a genetic cross. The main objective of this research is the comparative study in the form of a bibliographic review of the effect of the application of lignin in asphalt binder, analyzing its physical and rheological properties, based on the results of research carried out by Santos (2017) and Luz (2019), thus enabling , to verify the effects that this combination will be able to bring and with that to analyze the feasibility of the combination for application in more advanced studies. To obtain the results, short-term Aging tests (RTFO), Penetration Test, Softening Point and Rotational Viscosity are performed. The results indicated the feasibility of incorporating lignin to CAP 50/70 since they increased the fatigue life, the resistance to permanent deformations and delayed the aging process in all levels, with a positive highlight for the contents of 3% of Pinus. and Eucalyptus, in addition to the 9% of modified Eucalyptus that presented the best yields from the rheological point of view. In this way, the use of this natural polymer is a viable alternative from a technical point of view, and it can also be favorable in relation to the environment because it avoids inappropriate material disposal and economic issues because it adds commercial value to an industrial waste for the modification of binders.