In the present study it was analyzed the behavior of concrete with the addition of polyethylene terephthalate (PET) fibers, a polymer generally used in the production of bottles. The fibers were obtained manually, and the geometric and mechanical characterization of the fibers was performed. The fiber incorporation analysis was performed for the fresh and hardened state of concrete, for the PET fibers for fiber contents equivalent to 1000g/m³; 2000 g/m³; 3000 g/m ³, a dosage of steel fibers was used to obtain a parameter of the behavior of the craft fibers in relation to the normalized steel fibers. The hardened concrete tests were performed at 28 days of curing, except for the axial compression strength, where the specimens were analyzed at 3, 7 and 28 days. In the fresh state, the results of the tests showed that both the addition of PET and Steel fibers resulted in loss of the concrete workability being the more expressive result for the higher PET fiber content. In the hardened state, there was a decrease in the axial compressive strength as the PET fiber contents increased, the steel fiber dosage showed the same behavior, at 28 days, the lower PET content presented higher resistance than the dosage with Steel fiber. The tensile strength decreased as the fiber content increased. For the toughness and flexural toughness tests, it was possible to observe the effects of the compatibility between the large aggregate and the length of the fiber and the post-peak instability behavior.
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