Estudo das propriedades mecânicas de misturas asfálticas com CAP 50/70 modificado por polímero reativo/não reativo e ácido polifosfórico.

Abstract

The polymer modified asphalt mixtures are increasingly being used to satisfy the growing road traffic needs, improving their resistance conditions and the asphalt coating durability under the action of heavy loads. The reactive/non-reactive polymers and the polyphosphoric acid, separated, are largely used as modifiers for the asphalt binders whose objective is to improve its mechanical properties. However, the combined use of them can provide better results that individually. This researches objective was to evaluate the mechanical behavior of the asphalt mixtures when modified with reactive/non-reactive polymer associated with the polyphosphoric acid as a catalyst in different contents. There were performed physical and mechanical tests on the 50/70 binder with the addition of ethylene methyl acrylate and glycidyl methacrylate (EMA-GMA) commercially known as S74, high density thermo-polymer (SX500) and polyphosphoric acid (PPA 116%), before and after the short term aging process (RTFO). The same procedures were performed on the 50/70 and 55/75 non modified binders. Asphalt mixtures were designed with 1,8%S74, 0,3SX500 associated with varied contents of 0,15; 0,30 and 0,50% PPA 116% and analyzed in relation to its mechanical behavior by means of traction resistance, resilience module, dynamic module, flow number, modified lotman and cântabro wear tests. The results indicate that the asphalt mixtures modified with reactive/non-reactive polymer associated with the polyphosphofic acid in the contents of 0,3 and 0,5%PPA are classified as 60/85-E elastomeric binders and have a higher permanent deformation resistance when subjected to high temperatures, greater wear resistance and lower susceptibility to humidity, indicating that this mixtures can be used as an alternative to conventional asphalt mixtures, mainly in tropical climate regions.