Estudo das propriedades reológicas do ligante asfáltico modificado com adição de óleo vegetal residual.

Abstract

Residual vegetable oil is obtained on a large scale as a by-product of the food industry, but the excess that is improperly disposed of harms the environment, and there is interest in finding alternative ways to dispose of it. Given the potential that Brazil has for the production of residual vegetable oil, and the satisfactory results of incorporating this product in the asphalt mixture, as they have antioxidant properties, and aspiring to reduce the disposal of waste oil in the environment. This research proposes a study on the rheological properties of asphalt binders modified with the addition of residual vegetable oil in order to provide: would improve the rheological behavior of asphalt mixtures so that they are more resistant to aging by exhibiting reduced permanent deformations, longer fatigue life and ensure sustainability by reinserting the oil that has already been used in the production cycle. Thus, this research aims to study the modification of the 50/70 asphalt binder with the addition of residual vegetable oil, in the contents of 1%, 2% and 3%. RTFOT aging procedure, conventional physical penetration and softening point tests, rheological tests of rotational viscosity, degree of performance (PG), creep and multiple stress recovery (MSCR) and linear amplitude scanning (LAS) were performed. ). The results indicated increased fatigue life, resistance to permanent deformation and retarded the aging process, with a positive highlight for the 2% content that presented the best rheological yields. Thus, the use of this residue is a viable alternative from a rheological point of view, and may be environmentally friendly as it avoids improper material disposal and due to energy issues as it reduces machining and compaction temperatures.