Análise das propriedades físicas e mecânicas de concretos com adição de óxido de grafeno

Abstract

Portland cement is one of the most widely used materials in civil construction worldwide, essential for concrete production. In order to reduce costs and achieve satisfactory mechanical properties, the use of graphene oxide (GO) has been proposed. Graphene oxide is a nanomaterial that has recently gained attention from the construction industry due to its significant improvements in concrete properties. This study investigates the effects of adding GO on the physical and mechanical properties of concrete with compressive strengths of 30 and 35 MPa, applied in materials from Campo Grande, Mato Grosso do Sul, Brazil, with GO additions ranging from 0.00% to 0.09% by weight of cement. The study demonstrates that GO influenced the decrease in workability of fresh concrete. The addition of 0.09% GO was able to reduce water absorption, with reduction values of 0.76% (C30) and 0.64% (C35), as well as increase compressive strength by up to 12.85% (C30) and 13.64% (C35) at 28 days. Furthermore, a catalytic effect on GO hydration and stabilization in strength values at 63 days was observed. The static and dynamic of young’s modulus and ultrasonic velocity pulse (UVP) increased with the presence of GO additions, which may be related to the increase in compressive strength. Further studies are necessary to understand tensile strength, as the data obtained was inconclusive.