Estudo das propriedades químicas do ligante asfáltico CAP 50/70 modificado por adição de lignina proveniente de pinus e eucalipto.

Abstract

The introduction of modifiers for asphalt binders and asphalt mixtures, in order to avoid the appearance of pavement defects, improves the quality of the asphalt binder and therefore provides a longer service life for the pavement. The modification of asphalt binders is a practice that aims to increase the resistance to permanent deformations, such as cracks caused by fatigue or thermal variations, as well as, consequently, improve road safety and comfort conditions and reduce maintenance costs. The objective of this work was to study the modification of the asphaltic binder 50/70 by two types of lignin, from different species, hardwood (Pinus) and conifers (Eucalyptus), at levels of 3%, 6% and 9%. In this research the RTFO aging procedure and the FTIR chemical test were performed. The results indicated that incorporation of lignin to the CAP 50/70 can reduce the aging process by reducing the binder oxidation process, but it is necessary to perform other chemical tests that attest to the indications verified in this work. In this way, the use of this natural polymer can be a viable alternative for the exploitation of the lignin surplus of the paper and cellulose industries, avoiding the inadequate disposal in the environment, as well as economically to be able to substitute a percentage by weight of the binder used in the paving, generating an extra source of income for the pulp and paper producing industries, as well as being used in place of high-cost synthetic polymers.