Properties of Steel Fiber Reinforced Concrete Using Either Industrial or Recycled Fibers from Waste Tires
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ISSN 1229-9197 (print version) ISSN 1875-0052 (electronic version)
Properties of Steel Fiber Reinforced Concrete Using Either Industrial or Recycled Fibers from Waste Tires Julian Carrillo1*, Juan Lizarazo-Marriaga2, and Fabian Lamus3 1
Department of Civil Engineering, Universidad Militar Nueva Granada, UMNG, Bogotá 110111, Colombia 2 Department of Civil Engineering, Universidad Nacional de Colombia, Bogotá 111321, Colombia 3 Department of Civil Engineering, Pontificia Universidad Javeriana, Bogotá 110231, Colombia (Received October 3, 2019; Revised November 28, 2019; Accepted January 3, 2020)
Abstract: Currently, more than 2.5 million tires are discarded each year in Bogotá, Colombia, and 1.2 million of them are not properly disposed, producing a huge environmental problem. As a possible solution, previous studies have assessed the performance of steel fibers recovered from recycled post-consumer tires as reinforcement of concrete. However, engineers in Colombia are still uncertain to use this type of recycled material, since the concrete and the dosages used in reported studies were obtained mostly from different construction practices and materials in countries other than Colombia. The aim of this paper is to show and discuss the results of a research intended at evaluating the mechanical response of concrete reinforced using recycled steel fibers from waste tires in Bogotá, Colombia. The testing campaign of the study comprised 45 axial compression and splitting tension tests on cylinders, and 14 bending tests on concrete slabs reinforced using nominal fiber dosages of 15, 30 and 60 kg/m3 of steel fibers obtained from used tires. For comparative purposes, the study included also the test on 21 cylinders and 12 beams made of concrete reinforced using industrial steel fibers, with the same nominal dosages used for the recycled steel fibers. Based on measured response, preliminary design equations are proposed to estimate the mechanical properties of concrete reinforced using recycled steel fibers. It is also checked whether the obtained results fulfil the requirements specified by ACI-318 and NSR-10 building codes when steel fibers are used as minimum shear reinforcement of concrete beams. Keywords: Steel fiber reinforced concrete, Waste tires, Recycled steel fiber, Industrial steel fiber, Concrete reinforcement
research to allow a better understanding of the local materials. Rossli and Ibrahim [7] stated that adding recycled steel fibers from tires to concrete improves crack resistance, compressive strength, bending strength and tensile strength. Sengul [8] stated that the fracture energy of concrete increased as recycled fibers are added. Zamanzadeh et al. [9] showed that recycled and industrial fibers contribute to control crack propagation and to maintain the crack width within some expected limits. Zamanzadeh et al. [9] also stated that the deflection achieved using specimens reinforced using industrial fibers was greater than that developed by specimens reinforced using recycled fibers. Centonze et al. [
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