Mechanical properties of self-compacting concrete with recycled bead wires

Abstract

This paper investigates the properties of self-compacting concrete with waste steel bead wires obtained as a result of the separation of waste tires. Waste steel bead wires were added to concrete between 1% and 5% by weight with an increment of 1%. In total, 54 cubes, 6 cylinders and 6 beams were cast, cured and tested in according to various standards to obtain the compressive, splitting tensile and flexural strengths, respectively. In addition, 6 cubes were left in salty water solution with a salt concentration of 4% for 120 days and tested in compression. A scanning electron microscopy (SEM) was also conducted on samples after failure. Test results showed that short time corrosion of steel fibers does not affect the mechanical properties. Also, the increase in the ratio of steel fiber was found to contribute positively to the mechanical properties of concrete up to 4%, beyond which, mechanical properties were reduced. Finally, in the samples subjected to bending tests, it has been found that a 6-fold increase in bending strength compared to the reference (non-fiber) sample was achieved in case of steel fiber ratio of 4% and 5%.

The effect of curing conditions on the mechanical properties of SIFCON

“…Although the UPV value was expected to increase with the increase in fiber content, due to the high density of the steel fiber, no such result was observed in the experimental studies. Similar results were seen in Köroglu and Ashour's studies (Köroglu & Ashour, 2019). On the contrary, although the UPV value of the slurry used in the preparation of the samples was 4851 m/s, the UPV value of the SIFCON prepared using the same slurry decreased and varied between 3918 m/s and 4482 m/s.…”

Shear response evaluation of sustainable self‐compacting concrete made up of recycled steel fibers of waste tyres

“…Hence, discovering alternate ways for waste tyre mitigation is need of the hour European Tyre and Rubber Manufacturers Association (ETRMA 26,27 ) The environmental problems associated with improper management of waste tyres increased over the past several years. 12,24,28 The way of disposing of tyres by burning causes serious impact on the environment. The alarming situation of waste end-oflife tyres (ELT) statistics demanded discovering means of their suitable reuse in various sectors of life.…”

“…9,28 The steel fiber waste from tyres could be re-utilized in SCC to improve its shear strength. 28 Infact, the use steel fibers extracted from waste considerably improves the split tensile strength of concrete, ductility and postfracture energy absorption. 29,30 Also, the addition of steel fibers significantly improved the various mechanical properties which include, toughness in postcracking, ductility, and shear strength of concrete.…”

Strengthening of Thin Flexural Members Using Strips Extracted From Used Tires

“…al., 2020) have suggested the use of the graded rubber particles obtained from damaged tires as aggregate in the concrete mix by the partially replacement of the coarse or fine natural aggregate. Other studies (Sengul, O, 2016), (Hu, H, et al 2018), (Simalti, A, and Singh, A, 2021) and (Köroglu, M.A., Ashour, A, 2019) have investigated the ability of using the extracted steel pieces obtained from the recycled tires as steel fibers to produce fibrous concrete instead of the commercial type fibers. Pilakoutas et al (Pilakoutas, K, et al, 2004) suggested the ability to use the extracted steel wires from the texture of used tires as fibers that could be mixed with the fresh concrete to produce fibrous concrete.…”