Influence of continuous plastic fibers reinforcement arrangement in concrete strengthened

Many studies have been done using waste short plastic fibers to reinforce concrete.The objective of this investigation is the development of a novel arrangement of reinforcement with continuous recycled PET fibers, to enhance the mechanical properties of concrete beams.The novel arrangement consists of continuous PET fibers of the same length as concrete beams, placed in the mold, fixed and prestressed prior to casting the concrete.Due to the fact that in previous investigations on concrete reinforced with PET fibers, these fibers have been used in a short, dispersed way; it is of interest to compare the effect of the novel arrangement of continuous fiber reinforcement with the typical short, discontinuous fiber reinforcement.Thus, in this paper concrete beams were reinforced using both fiber arrangements.The mechanical behavior of reinforced concrete samples were evaluated and compared by bending tests.The results showed a better performance of the continuous PET fiber reinforcement than that of the short, discontinuous one; the continuous PET samples presented a great increase in the concrete properties in 150% the maximum load in bending.Before testing the concrete composites, recycled PET fibers were mechanically and structurally characterized by FTIR, DSC and tensile tests.