Análise dos efeitos de fibras de capim annoni na adesividade e perda de massa por desgaste em misturas asfálticas

Abstract

With the lack of maintenance, increase of the vehicle fleet, and the excesses of the maximum load allowed per axle, many of the Brazilians highways do not have the minimum trafficability conditions. Under these conditions, it is of great importance to increase the studies searching for new methods and materials to improve the resistance of the pavements. Due to the good results that the additions of several types of fibers to the conventional concrete matrix have presented, the present work had the purpose of adding annoni grass fibers in asphalt mixtures in order to analyze its influence in the tests of adhesiveness and loss of mass by wear of asphalt mixtures. For the purpose of this study, specimens were molded with conventional mixtures and reinforced by the addition of 0.5% and 1% annoni grass fibers (1 cm and 2 cm length), after this, two tests were performed for evaluation: Adhesiveness Test – Modified Lottman and Mass Loss of Wear Test - Cantabro. After the test, it was possible to verify that the mixtures were considered inadequate for adhesiveness. With the results of the wear resistance test it was found for the reinforced mixtures a situation acceptable by the DNIT, but with lower values than the reference mixture. Thus, it was possible to conclude that the addition of fibers in asphalt mixtures can contribute positively. However, for the situation of annoni grass fiber, it was not feasible in relation to the tests performed, however, it is of extreme importance that other tests are carried out to obtain a definitive conclusion for such application.