Determinação do módulo complexo do ligante asfáltico modificado por adição de óleo de copaíba.

Abstract

Most of the floors currently run are derived from hot-machined asphalt mixtures, which are produced at high temperatures and emit gases responsible for the greenhouse effect. Thus, the attempt to reduce these temperatures is considered an alternative in the production of asphalt coatings capable it to provide economic and environmental advantages. There are several types of substances that are added to the asphalt binder provide This Reduction, among the main modifiers are the oils. In this way, this research aims to verify the influence of the addition of Copaiba oil in the contents of 4 and 5% in petroleum asphalt cement (CAP) 50/70, in the reduction of compaction and machining temperatures and the physical and rheological characteristics of the asphaltic ligand. For this purpose, conventional physical penetration assays, softening point, and rotational viscosity were used before and after the procedure of short-term ageing (RTFO) and the rheological test of the master curve. The addition of Copaiba oil resulted in decreased softening point and increased penetration as a function of decreased hardness and viscosity. Therefore, it assisted the decreases in compaction and machining temperatures, thus becoming beneficial in the matter of workability and sustainability. However, it can be seen loss of resistance in relation to the pure binder, due to the reduction of the complex modulus (G *) and increase in its elasticity checked by reducing the phase angle (δ). The results showed that the sample with 4% Copaiba oil demonstrated better rheological performance in relation to the ligand resistance, bearing in mind a Reduction of machining and compaction temperatures.