Propriedades reológicas do ligante asfáltico (CAP 50/70) modificado por adição de lignina.

Abstract

The study and development of paving materials has been highly motivated by the many problems that pavements have faced. However, dependence on fossil fuels, with the use of synthetic polymers for example, is of concern, mainly because of the environmental impact resulting from such use. Thus, alternatives based on renewable and still reused resources of industrial processes are gaining ground, such as lignin, which is a natural polymer, a byproduct of the pulp and paper industry, and which has already shown great potential in some research from its association with the asphaltic binder, mainly due to its antioxidant properties. Thus, this research had the objective of verifying the effect of the addition of lignin in the contents of 3%, 6% and 9% in the rheological properties of the asphalt binder CAP 50/70. Conventional penetration, softening point and elastic recovery tests were performed, as well as special tests such as rotational viscosity and those performed in the DSR, to determine the parameters of the performance level and the MSCR test, all before and after the short term aging (RTFO), in addition to the chemical FTIR assay. It was observed that the binders modified by addition of lignin showed to be more resistant to temperature variation, to permanent deformation, but mainly to aging, showing the performance of this material as an antioxidant, especially for the 9% content, although the other contents also have shown superior performance to the pure binder, demonstrating that the use of lignin in general has proved to be viable both rheologically and environmentally when it is associated with the conventional binder.