Análise técnica e comparativa da aderência das barras de aço e de polímero reforçado com fibra de vidro no concreto

Abstract

Reinforced concrete stands out as the most widely used construction material in the world and, in recent years, various studies have been carried out to improve this material. Considering the importance of concrete, the main characteristics of the structural elements designed must be taken into account, including the concrete's tensile strength, which is limited, making it necessary to incorporate steel reinforcement, thus resulting in reinforced concrete. In search of new alternatives to replace the reinforcement in reinforced concrete, taking into account the possible scarcity of raw materials, and also to find better performance of structural elements, new products have been studied, such as glass fiber reinforced polymer (GFRP) bars. The purpose of this study is to compare the characteristics and behavior of steel bars and GFRP, with an emphasis on adhesion to concrete. To carry out the adhesion analysis, the modified direct pull-out test (APULOT) was performed. The procedures adopted sought to understand the impact of the variables analyzed on the behavior of the rebars and the concrete-reinforcement interaction. Finally, the results obtained showed that the GFRP bars had better tensile strength and higher average bond strength values compared to steel, which were compared in a technical and objective manner, with the aim of identifying the advantages and limitations of each material.