Avaliação do módulo complexo, ângulo de fase e viscosidade por meio das curvas-mestre do ligante asfáltico CAP 50/70 modificado por óleo de linhaça.

Abstract

Roads are one of the main transportation systems used for the movement of people and goods. However, in recent decades, the increase in traffic volume, axle loads and tire pressure has led to the premature degradation of asphalt coatings. The existing pathologies originates from the bad use of the road due to large requests for which the pavement was not designed, deficiencies in the execution of the construction process, the use of materials with insufficient properties to meet the need, as well as the current climatic conditions. Thus, the use of modified asphaltic binders aims to improve the physical and rheological properties of the pavement. This study aims to evaluate the effect of the addition of linseed oil to the CAP 50/70 in the 3% content. The behavior of the modified binder by the addition of linseed oil was evaluated, and the rheological test of the master curve was performed to measure the parameters of complex modulus, phase angle and viscosity. From the results, it was observed that the modified CAP showed a decrease in the complex modulus, making the binder more fluid, but less resistant. In relation to the phase angle, the modification caused it to decrease at low frequencies, but converging with the virgin CAP at higher frequencies. In addition, the viscosity analysis the modification made it less viscous, which ultimately reduces its machining temperature. Thus, linseed oil showed to be a viable and sustainable alternative for improving the rheological properties of asphalt binders.