Estudo do efeito da adição de fibras de polipropileno nas propriedades mecânicas de módulo de resiliência e resistência a tração das misturas asfálticas

Abstract

With the increasing of pavement deterioration and modest investments for expanding and maintenance of road system, new technologies and materials are evaluated to mitigate the flaws through time. Synthetic propylene fibers have been used in cementitious matrices and soil reinforcement with the aim of to increase its bearing capacity. This study proposes three polypropylene fiber additions to the matrix asphalt mix with the aim of evaluate the mechanical behavior and compare the results to Heck's (2015) research for a conventional mixture and a mixture containing added. Initially, the Marshall dosage was performed for volumetric characterization of mixtures, followed by two mechanical tests: geotechnical and resilient properties, and tensile strength by diametral compression. The results obtained with the dosage were compared to conventional mixing and to the Heck (2015) mixture with propylene fibers, as well evaluated by the minimum requirements recommended by standards. According to the results, all three proposals mixtures comply with the regulatory requirements. Compared to conventional Heck (2015) mixing, can be stated that the addition of polypropylene fibers as a reinforcing material for flexible pavements is valid, since it supports considerable amounts of deformation in a long period of time.