Análise das Propriedades Mecânicas do Concreto com Diferentes Teores de Fibra de Aço

Abstract

This research presents an experimental investigation into the mechanical behavior of concrete reinforced with steel macrofibers, evaluating their influence at different contents in the cementitious matrix. Initially, an in-depth literature review was conducted on conventional concrete, its properties in the fresh and hardened state, as well as the history, types, applications, and mechanisms of action of metal fibers, especially steel fibers. Six concrete mixes were prepared: one reference mix (without fibers) and five with macrofiber additions at contents of 0.5%, 1.0%, 1.5%, 2%, and 3%. The workability of the mixtures in the fresh state was evaluated using the slump test, while the properties in the hardened state were analyzed by tests of axial compressive strength, diametral compression tensile strength, flexural tensile strength, and modulus of elasticity, in accordance with ABNT standards. The research aims to identify the contributions of metal fibers to improving the mechanical strength and ductility of concrete. The results obtained allowed for a comparison of the performance of fiber-reinforced concrete with conventional concrete, helping to define more efficient dosages and encouraging the use of fibrous materials in civil engineering.