Estudo laboratorial de misturas asfálticas do tipo concreto asfáltico dosadas com diferentes tipos de ligantes asfálticos

Abstract

A study of the use of a more viscous asphalt cement replacing a binder typically used in the state of Ceará is presented. Hot mix asphalts are produced using the more viscous asphalt cement 30/45 and the conventional asphalt cement 50/70. The study intends to evaluate the potential use of the more consistent asphalt cement. It is hoped that this binder is more appropriate for pavement applications given the local climate. The mixture design is based on the Superpave specifications of the Strategic Highway Research Program and resulted in very similar optimum asphalt contents. This mixture design is adopted to select the optimum asphalt content for mixtures with an air voids of 4%. The aggregate sizes fall within the limits of gradation C of DNIT. Complex modulus tests were performed in a large range of frequencies and temperatures in order to assess the viscoelastic behavior of the two mixtures. Furthermore, laboratory tests of resilient modulus, tension strength and fatigue life show that the mixtures with the more viscous asphalt cement presented better results.