Misturas integralmente recicladas: comportamento à fadiga e degree of binder activity

Abstract

The brazillian road network, in general, have been presenting functional and structural shortcomings conducted by a constant growth of highway traffic over the years. Thus, the need for routine rehabilitation is essential to maintain a level of comfort and safety on the roads. The milling residue is called Reclaimed Asphalt Pavement (RAP). Looking forward sustainable and economical viable solutions to engineering, the incorporation of this material in new mixtures has become increasingly present in European countries and United States. Aiming at increasing levels of RAP incorporation in recycled mixtures, engineers have been investing efforts in techniques and technologies, and it goes through a better understanding of RAP material. Pursuing increase the knowledge about intrinsic properties, 100% recycled mixtures were analyzed, continuing researches done in the research group. This study used mechanical tests to evaluate properties on these mixtures when compared to reference. Linear viscoelastic data were related to 2S2P1D model constants and degree of binder activity (DoA). Besides that, distinct fatigue analysis were used to cyclic tension fatigue test, comparing references to recycled mixes. The ε6 criteria was more promising because of its simplicity, since the S-VECD based evaluations methods didn’t went well due high viscoelastic modulus in test conditions and different percentage of void contents in 100% RAP mixes. Lastly, it was possible to correlate DoA to fatigue data, showing that this is parameter that has a great impact in performance of reclaimed asphalt mixes and it has to be considered when evaluating high content of RAP recycled mixes.