Avaliação do desempenho mecânico e índice de permeabilidade de concretos porosos com substituição de agregado graúdo por miúdo

Abstract

Due to urban growth, the soil sealing contributes in an increase of inundations and flooding, causing losses and problems to the population. In order to minimize this problematic, the pervious concrete pavement acts as an infiltration system, draining water along the way and reducing surface runoff. However, the very pervious concrete has lower strength than the less pervious concrete. Aiming to improve the performance of high porosity concrete, the present work performed the partial replacement of the coarse aggregate by fine, being analyzed the traces with 100% gravel and the with replacement of 5 and 10% of sand, for the ratio 1:4 (cement: gravel) and water/cement factor 0,35. The data were satisfactory, with results superior to those stipulated by the current norms. The trace that stood out was replacement of 10%, with flexural tensile strength 6,44% higher than the trace with 100% gravel.