Uso de fibras de aço em concreto para pavimentos

Abstract

The concrete pavement of portland cement is presented as a viable alternative in the current Brazilian context due to low investments in maintenance over its lifetime. However, concrete has a brittle behavior and a low capacity of deformity before rupture. The use of concrete reinforced with steel fibers seeks to correct this deficiency of the material. This paper presents a study of concrete reinforced with steel fibers used in flooring,through laboratory tests. It was evaluated the axial compressive and tensile strength indirectly through triangular plaque assay according to Almeida (1999), as well as diametral compression and four-points bending of concrete with different amounts of steel fibers. It was made four kinds of samples, a reference mark, without fibers, a mark with the content specified by the manufacturer of fiber (25 kg/m³) and two alternatives, one with 15 kg/m³ of fibers and the other with 35 kg/m³. The results show that for tensile strength, steel fibers present in the concrete, reduced the crack propagation and promoted post-cracking ductility, and triangular plates ocurred a process of cracking, well defined by three cracks as predicted by Almeida (1999). In terms of the axial compressive strength concrete reinforced with fiber, also performed better at 28 days old.