Estudo do comportamento de misturas asfálticas densas modificadas com borracha moída

Abstract

The environmental concern is one of the main factors to justify the growing studies regarding the reuse of waste materials that can be used as an alternative to improve the performance of asphalt coatings. In this context, this research consisted of carrying out laboratory tests to evaluate the behavior of modified asphalt mixtures with the incorporation of 1; 3 and 5% ground rubber.. The rubber incorporation procedure performed, known as the dry process, consists of replacing part of the small aggregate of a reference mixture that uses brita 0, brita 1 and stone powder as aggregates. Initially, the Marshall dosage was performed for the volumetric characterization of the mixtures, followed by two mechanical tests: resilience modulus and tensile strength by diametrical compression. The results of the tests of the mixtures with rubber substitution were analyzed and compared with the conventional mixture, as well as evaluated to the minimum requirements recommended by the norms of the DNIT. According to the values found, lower rubber contents give better results. The mixture with 1% rubber was the one that met the requirements required by the standards and the values found were compatible with other researchers. However, modified asphalt mixtures with ground rubber require higher binder consumption and present lower results when compared to the conventional blend. In spite of this, the technical feasibility for the execution of coatings with the use in small percentages of recycled rubber became evident.