Comparativo da resistência ao cisalhamento direto entre concretos autoadensável e convencional

Abstract

The self-compacting concrete shows properties that optimize the constructions processes and their workability provide better casting and compacting conditions. Although there is still some questioning from professionals and researchers in the structures field about how its elasticity modulus and shear resistance might be different than conventional vibrated concrete. Because of that, this paperwork has the purpose of comparing the shear resistance of one mix of conventional concrete and two self-compacting mixes, modifying the size of the coarse aggregates particles and its percentual volume, looking to verify how those modifications can influence the shear transfer mechanism. For the quantification of shear resistance of the concrete, it was used a test based in the Japanese code SF-6 (JSCE 1990). It was possible to satisfactorily quantify the shear resistances on the concretes interface with the adaptation of this method for the tested concretes. With respect to the resistances obtained with the changes in the concrete mixes it was observed a greater change with the combination of the decrease of the coarse aggregates size and increase in the fine particles content in the mix. Concerning the self-compacting concretes the reduction in the coarse aggregates volume did not represent significant deviation in the shear resistance, the difference was 8,67%. The experimental tests results were compared with the American a Canadian codes, it was found that these underestimate the medium resistances for all mixes.