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EFEITO DO USO DE NANOAGREGADOS DE PRATA NO CONCRETO

The present work deals with the study of the effect on concrete performance through the addition of silver nanoparticles, here considered as a nanoaggregate, as a way of acting on microscopic characteristics of the concrete. The evaluation was done by comparing the mechanical performance of a conventional concrete composition without and with the addition of silver nanoparticles, with sizes between 20 and 80 nm, through two solutions with concentrations of 16 and 38ppm. Traditional compression tests were carried out on standard test specimens, according to NBR 5739. Small size test specimens were also used, from which tension versus strain curves were obtained. These samples were tested in the natural state and after subjection to a solution of nitric acid HNO 3 at a concentration of 0.4N. Despite the small final volumetric fraction, the presence of silver nanoparticles significantly altered the performance of the material.