Estudo do comportamento do concreto autoadensável com a adição do resíduo de beneficiamento de mármore e granito em diferentes porcentagens.

Abstract

To obtain a self-compacting concrete (SCC) a large amount of fines is needed in its mixture, in order to fill the existing voids and, consequently, provide greater fluidity, workability and cohesion. The marble and granite beneficiation residue (MGBR) was added as a fine material for the production of self-compacting concrete, aiming to analyze its properties in the fresh and hardened states. In addition, an adequate way of disposing of this waste was sought, since it is generated in large quantities, causing environmental damage. The self-compacting concretes were dosed from a mixture of the following materials: cement CP V – ARI, fine sand as fine aggregate, gravel 0 as coarse aggregate, Superflow superplasticizer additive and addition of MGBR. Four mixes were produced for this study, one without the presence of addition and the others with additions in percentages of 10%, 30% and 50%, with the respective additive contents of 1.21%, 1.26%, 1 .28% and 1.30%. In the fresh state, all mixes showed satisfactory results in terms of spreading, passing ability, viscosity and resistance to segregation. Regarding the hardened state, the compressive strength test was performed at 7, 14 and 28 days, it was observed that as the residue was added, there was an increase in compressive strength for all ages. Physical properties, such as water absorption, void index and specific mass, showed similar results for all mixes. Therefore, the addition of MGBR is a good alternative, as it performs well both in the fresh and hardened state. Furthermore, it makes an environmentally viable destination possible.