ANÁLISE DAS PROPRIEDADES MECÂNICAS DO CONCRETO AUTO ADENSÁVEL COM RESÍDUOS DE CONSTRUÇÃO E DEMOLIÇÃO

Abstract

The self-compacting Concrete (SCC) is considered one of the major advances in the development of new concretes, his efficiency is related to high fluidity, increasing productivity and facility in construction. Aside from being considered a special concrete, it can be presented as a sustainable material by replacing the natural fine aggregates with fine aggregates from Construction and Demolition Waste (CDW). Therefore, this study was developed with the objective of investigating the influence of the partial replacement of natural fine aggregate (NFA) by recycled fine aggregate (RFA) from the Hydroelectric Power Plant inTucuruí-PA. The mix design methodology was based on an adaptation in method of Gomes. Three substitution (10%, 20% and 30%) percentage of NFA were tested for RFA, comparing them with a reference SCC. The cylindrical specimens were submitted to mechanical tests of resistance to axial compression and diametral tensile strength. During the study in the fresh state were realized Slump-flow test, Funil-V and Caixa-L. Based on the results, it can be concluded that it is possible to produce SCC with up to 30% of RFA, maintaining its properties in the fresh state and hardened within the parameters proposed by standards. It has also been observed that with an adequate mix design methodology it is possible to reduce adverse effects on the mechanical properties of the SCC.