Análise dos efeitos de fibras de polipropileno na adesividade e vida de fadiga 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. Following the studies of Heck (2015), this study aimed to analyze the influence of polypropylene fibers in asphalt mixtures to the adhesiveness tests and fatigue life. For this study, samples were molded with conventional mixtures and mixtures reinforced by the addition of 0.5% polypropylene fibers, after that, two experiments have been conducted for avaliation: Modified Lottman test and Fatigue test for diametral compression. After the experiment it was found that the mixture reinforced with fibers is considered adequate for adhesion. The results of the fatigue test simulations were performed in SisPav software and found a significant improvement in mixtures reinforced with fibers. Thus, it was concluded that the addition of fibers in asphalt mixtures contributes positively, especially in relation to the life of the pavement fatigue.