Análise do módulo de resiliência e da resistência à tração em misturas de concreto asfáltico com adição de fibras de Polipropileno

Abstract

With the growing increase in road traffic, combined with the early degradation of pavements and the lack of investments in modal expansion and maintenance, new technologies and materials are being evaluated to alleviate pavement defects over time. Due to the good results that the fiber additions have provided in the conventional concrete matrix and in the soil stability, regarding the increase in the carrying capacity, the present work aims to analyze the viability of the addition of polypropylene fibers on the mechanical behavior of asphalt concrete. The work consisted of the characterization of the materials used, Superpave dosing and tensile strength tests by diametral compression and resilience modulus. The tests were carried out on asphalt concrete mixtures with the addition of 0.25% and 0.50% of 20 mm length and 0.85 mm of thickness polypropylene fibers. The results show that polypropylene fiber retains beneficial properties for asphalt up to 160 ° C, with melting at 170 ° C. The addition of fibers revealed a tendency to increase tensile strength, while the resilience modulus tends to decrease, making the mixture less rigid, however, all RT and MR values are within the normalized limits. Thus, it can be argued that the use of polypropylene fibers as a reinforcement material in flexible pavements is valid because the fiber tends to improve the mechanical properties of the mixture.