Avaliação das propriedades de durabilidade do concreto auto-adensável obtido com resíduo de corte de mármore e granito

Abstract

The self-compacting concrete (SCC) is a special concrete with excellent fluidity in the fresh state that dispenses the use of equipments of vibration for its compacting, furthermore ensures a resistance to blocking when released into elements with high rate reinforcement, decrease of transverse cross section and complex forms. The SCC mixes use a superplasticizer admixture and additions type filler and/or viscosity modifying, moreover lower volume and lower maximum size of the coarse aggregates. The use of mineral additions from industrial waste as a component of concrete, especially the so-called special concrete, has grown in several countries. In the SCC the use of waste as addition type filler is highly receptive, like the "mud" generated in the processing of blocks of marble and granite. The Residue of Court of Marble and Granite (RCMG) is generated on a large scale in many parts of Brazil, which led the Universidade Federal de Alagoas through its researchers to develop various experimental works using RCMG as addition type filler. They pointed out that the use of RCMG improved the performance of the concrete in the states fresh and hardened, however, demonstrated the need for a broader study of the durability of the CAA using the residue. In this way, this study used a SCC of previous studies, which has as filler addition the RCMG, and two reference concretes, one of them with corrosion inhibitor admixture. Properties of durability of these concretes were determined, evaluated and compared among them. The properties acquired were: air permeability, water absorption by capillary suction, carbonation resistance, corrosion resistance of steel bars embedded in the concrete and resistance to attack by sulfates. The results show that, in general, the properties of durability of the SCC were higher than those found in the conventional concretes.