Avaliação das propriedades mecânicas de misturas asfálticas produzidas com CAP modificado por lignina proveniente do eucalipto.

Abstract

Brazilian asphalt paving, as well as other countries, is constantly in need of evaluation and renovation due to the deterioration of pavements, notably asphalt pavements. The existing pathologies originate from the bad use of the road due to large requests for which the pavement was not designed, deficiencies in the constructive process execution, the use of materials with insufficient properties to meet the need, and also of the current climatic conditions, among other causes. The modification of asphalt binders is a practice that aims to increase permanent deformation resistance, reduce cracks caused by fatigue or thermal variations, as well as, consequently, improve the conditions of safety and comfort of the highways and reduce costs with maintenance. Thus, this study aims to evaluate the mechanical properties of asphalt mixtures produced with lignin-modified CAP from eucalyptus at levels of 3 and 6%. The tensile strength presented a higher value in the 3% eucalypt content in the binder and it was concluded that this material has the most adequate stiffness to this parameter. There was increase of the Resilience Module with the increase of the eucalyptus content in the asphalt binder. As for tensile strength, there was a decrease in relation to the pure binder, which shows that in this partially saturated condition the samples with addition of eucalyptus contents present a lower aggregate-binder adhesion more evident in the 3% sample; The Dynamic Modulus assay confirmed that addition of eucalyptus contents in the blend gives an increase in stiffness. From the realization of resilience modulus tests, modified Lottman, indirect traction and dynamic modulus. It was observed that addition of the lignin to the binder provided improvements in its properties.