Verificação do potencial de utilização de fibras vegetais em misturas de concreto asfáltico

Abstract

With the increase in the volume of traffic on the highways in recent years, it becomes increasingly important a floor that meets the requirements of high durability and safety, providing comfort to users. Thus, to improve the efficiency of the floors is of fundamental importance the use of new materials that can contribute to the improvement of the general conditions of the floors. In this context, the present study aims to evaluate the use of Anonni grass fibers as reinforcement material in asphalt mixtures. Firstly, a study of the properties (absorption, specific weight, humidity, tensile strength and modulus of elasticity) of Capim Annoni for application as reinforcement in asphalt mixtures was carried out. This study considered four additions of annoni grass fibers in the asphalt mixture and a conventional blend for such comparison of mechanical behavior. 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 mixtures with additions were compared to the mixture without fiber and also to the blend with polypropylene fibers of Heck (2015), as well as evaluated if they meet the recommended by the DNIT standard. According to the results, only the blend with addition 1% 1cm of fiber that did not meet the minimum requirement required by the standard. In general, it can be affirmed that the addition of annoni grass fiber as a reinforcement material for flexible pavements has a promising future, since among the studied properties there is a trend of improvement, since it supports considerable values of deformations in period of time.