Estudo sobre a reciclagem de concreto de corpos de prova

Abstract

The construction industry is one of the main generators of solid waste, with concrete being one of the most discarded materials. This study evaluates the feasibility of recycling discarded concrete specimens in Salvador , analyzing their physical and mechanical properties for possible reuse in the production of new concrete. T o this end, laboratory tests are carried out to characterize the recycled aggregates, including granulometric analysis, powdery material content, water absorption, specific mass, and compressive strength. The results indicate that the granulometric ranges of the recycled aggregates are similar to those of natural aggregates, demonstrating the efficiency of the crushing process. The analysis of the powdery material content reveals that the recycled aggregates present values within the limits established by NBR 151 16:2021, being 3.8% for 30 MPa concrete, higher than that found by Carvalho (2018), who obtained 1.6%. In addition, the water absorption of the recycled aggregates remains within the normative limits. The specific and unit mass of recycled aggregates is lower than that of natural aggregates, which may affect the strength of the concrete, but does not make its application unfeasible. The mechanical strength tests demonstrate that partial replacement of natural aggregates by recycled aggregates may be feasible, provided that the normative specifications are met and the necessary adjustments are made to the dosage. In this way , the study contributes to the sustainable management of construction waste, proposing alternatives for the reuse of test specimens discarded in Salvador .