Abstract
The global rapid increase in waste tyres accumulation, as well as the looming social and environmental concerns, have become major threats in recent times. The use of Recycled Steel Fiber (RSF) extracted from waste tyres in fiber reinforced concrete can be of great profitable engineering applications however the choice of suitable length and volume fractions of RSF is presently the key challenge that requires research exploration. The present experimental work aims at investigating the influence of varying lengths (7.62 and 10.16 cm) and dosages (1, 1.5, 2, 2.5, 3, 3.5, and 4%) of RSF on the various mechanical properties and durability of concrete. Test results revealed that the varying lengths and dosages of RSF significantly affect the mechanical properties of concrete. The improvements in the compressive strength, splitting tensile strength, and Modulus of Rupture (MOR) of RSF reinforced concrete observed were about 26, 70, and 63%, respectively. Moreover, the RSF reinforced concrete showed an increase of about 20 and 15% in the yield load and ultimate load-carrying capacity, respectively. The durability test results showed a greater loss in compressive strength and modulus of elasticity and a smaller loss in concrete mass of SFRC. Based on the experimental findings of this study, the optimum dosages of RSF as 2.5 and 2% for the lengths 7.62 and 10.16 cm lengths, respectively are recommended for production of structural concrete. Doi: 10.28991/cej-2021-03091750 Full Text: PDF
Highlights
In recent times, the extensive use of scrap tyres as fuel and dumping material across the globe has resulted in a rapid increase in persistent organic pollutants (POPs)
Test results revealed that the percentages of Recycled Steel Fiber (RSF) and their lengths, both affect the compressive strength of steel fiber reinforced concrete (SFRC)
The decrease in the compressive strength of SFRC in the case of high dosage and greater length of RSF could be associated with the lower workability of concrete mix which resulted in a weak quality matrix with unwanted pores and cavities
Summary
The extensive use of scrap tyres as fuel and dumping material across the globe has resulted in a rapid increase in persistent organic pollutants (POPs). This has created serious repercussions for the natural environment and human health. More than one billion tyres become scrap material after the end of their service life, in which more than half of its amount is wasted by either dumping at landfill sites without any proper treatment or by burning in free space [3]. The concept of rubber aerogel has shown excellent sound and thermal insulation abilities thereby resulting in effective and efficient recycling of waste tyres [8]
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