Concreto com uso de fibras de resíduo de borracha de pneu como substituição parcial ao agregado miúdo convencional para pavimento rígido.

Abstract

This research approaches the comparison between a simple concrete pavement and a concrete pavement with fine aggregate modified by the use of tire residue. In this way, it is expected to help improve the scenario of accumulation and incorrect destination of the waste tire, aiming at reducing the environmental impact, giving the material a new function. For this, the axial compressive strength at 7 days and 28 days and the flexural tensile strength at 28 days were compared between rigid paving with plain concrete and rigid paving with fiber-modified concrete. tire rubber waste. The partial replacement (in mass with specific mass compensation) of the conventional fine aggregate by the tire rubber fiber residue was proposed in the following proportions: 0% (REF), 25% (25RBP) and 50% (50 RBP). In order to maintain the consistency of the concrete in all the studied mixes, without altering the water/cement ratio, a superplasticizing chemical additive based on polycarboxylates was used. It was observed that tire rubber helps in the deformability of concrete, however, it decreases axial compressive strength and flexural tensile strength. Therefore, it is concluded that it is possible to partially replace the conventional fine aggregate by the tire rubber residue for concrete of rigid pavements, however, the replacement content will depend on the project situation. As a result of the proportional study, a strength was inversely the amount of rubber content replaced. We could notice the specimens taking different shapes during the rupture tests, where either REF present the largest test tests of axial models and the traces with replacement of the smallest value (25BP and 50R) show a deformity at the insertion of the tire rubber a greater deformability to concrete, creating anchors along the piece, not disintegrating even after rupture. Keywords: Concrete. Concrete using Tire. Rigid Floor. Pavement with use of Tire. Tire as fine's Aggregate.