Concreto de pós reativos - estudo das adições minerais: cinza de casca de arroz, etacaulim e sílica ativa

Abstract

The use of mineral additions in concrete has become increasingly widespread by means of studies that aim the most diverse characteristics, such as: increasing the durability, increasing the mechanical resistance and utilization of industrial waste. Studies on Reactive Powder Concrete (RPC), also, are gaining ground mainly by the increase of resistance they provide. This sense, this research aims to introduce some additions minerals in CPR such as: rice husk ash, silica fume, and metakaolin, individually in three percentages: 0, 20, 25 and 30%. The mixture is composed of Portland cement CPV ARI, fine sand or quartz sand, quartz powder, superplasticizer and water/binder factor about 0,17. Assays were performed to characterize the materials used and comparisons were made between the traces from the axial compression test of cylindrical specimens. Through values found was found satisfactory performance of the additions used, characterized by high resistance achieved.