Efeito da adição dos óleos de Ricinus communis e Linus usitatissimum nas propriedades reológicas do cimento asfáltico de petróleo puro e modificado.

Abstract

The decrease in temperature during the production and application of asphalt provides evident sustainability benefits, in the short, medium and long term, which are related to social, economic and environmental positive impacts. Natural additives derived from oilseeds such as palm, soy, sunflower, peanut, linseed and castor beans are potential viable agents to reduce the mixing and compaction temperature (TUC) to be incorporated into the CAP that will make the asphalt mixtures. This study a ims to analyze the effects of adding oil, especially the Castor and linseed oil, on the Rheological Properties of the Petroleum Asphalt Cement. Conventional rheological behavior CAPs were observed (CAP 50/70) and modified (CAP 55/75) considering percentage of 4%, 5% and 6% of the oil, as well as the mechanical properties of asphalt mixtures dosage by Marshall and Superpave procedures. The rheological results of CAPs with the addition of linseed oil showed better results than those obtained with the addition of Castor beans oil, according to the parameters related to the penetration tests, softening point, rotational viscosity and rheology (MSCR), when the samples were subjected to short-term ageing (RTFO). For the asphalt mixtures, it was obtained a better adhesion and cohesion what resulted in a greater resistance to deleterious action of water when the test samples were subjected to induced moisture damage test (modified Lottman) and the Cantabro wear test whose results were significantly better compared to the blends with CAPs in natural condition. It can be inferred that the oilseeds, in the proportion of 5%, can be used as additives for improving the rheological properties of asphalt, conventional and modified Cement, with a significant reduction in oxidative power inherent to temperature increase, and, consequently, with the improvement of mechanical properties of asphalt mixtures.