Abstract

Waste tires am considered to be massive trash and am usually abandoned in legal or illegal landfills. Their abandonment is associated with environmental impacts on land use and visual pollution, among others. Conversely, its recycling allows to valorize these residues by generating by-products such as rubber granules, steel fibers and textile fibers for new industrial applications. Several studies report the use of rubber and steel fibers of waste tires in concrete. The objective of this research was to compare the mechanical strength of concrete without the addition of tires residues (control group) at the ages of 7, 17 and 28 days, to concrete added with commercial steel fiber, and nibber and steel fibers from waste tires. The doses used were 50 kg/m(3) in concrete with commercial steel fiber, 10.5 and 7 kg/m(3) in concrete with recycled rubber granules, and 50 and 35 kg/m(3) in concrete with recycled steel fibers. The results indicated that concretes with the addition of rubber and steel fibers showed in all cases a slight decrease in the compressive strength compared to the witness at the age of 28 days. Conversely, concrete with the addition of steel and rubber fibers presented better flexural strength than the witness concrete, except in the case of concrete with 50 kg/m(3) of recycled steel fiber.