Avaliação das propriedades mecânicas de misturas asfálticas mornas modificadas com a adição de óleo de soja.

Abstract

Concerns about sustainable production processes of asphalt paving have led to the development of asphalt mixtures produced and compacted at temperatures lower than those traditionally applied, obtaining reductions in energy consumption, greenhouse gases emissions and providing better working security on the field. Additions of organic additives derived from oilseeds into the asphalt binders can change its viscositytemperature behaviour, working as a viable tool to reduce the temperatures of production and application. In this context, the feasibility of inserting soybean oil into the asphalt binder was analysed and confirmed on rheological and physical aspects. The present research has as objective to study the 55/75 asphalt binder partially substituted with new and after consumption (residual) soybean, as well as to verify the influence on mechanical properties of reducing 10 and 20 oC on the temperature obtained from the rotational viscosity test when compacting the asphalt mixtures. The tests of Indirect Tensile Strength, Resilience Modulus, Modified Lottman, Dynamic Modulus and Flow Number were performed. The results show that the addition of soybean oil tends to reduce the asphalt mixtures maximum strength, stiffness and resistance to permanent deformation. These values, however, still met the specifications for quality of the resulting pavement, promoting less environmental damage, lowering levels of energy consumption and proving an environmentally friendly dispose of the residual oil.