Abstract
This paper explores the possibility of the partial replacement of the longitudinal reinforcement in reinforced concrete (RC) beams with recycled steel fibres (RSF). Testing was focused on the contribution of two volume ratios of the RSF—0.5%, 1.0%. Basic compression and flexural tensile tests were performed to evaluate the effectiveness of the fibres following current standards. Additionally, the full-scale beams with and without conventional reinforcement were subjected to four-point bending tests. The results indicate that RSF improved the load-bearing capacity of the RC beams. Cooperation of RSF with the steel bars in carrying loads was proved. Findings from the Digital Image Correlation (DIC) revealed no impact on the cracking pattern of the RC beams.
Highlights
It is possible to reduce waste disposal amounts by their re-using in construction building materials
The volume ratios of 0.5% and 1.0% of recycled steel fibres improved the tensile parameters of the concrete matrix what was proved based on the flexural tensile tests on notched beams
The residual flexural tensile strength values obtained indicated that the recycled steel fibres (RSF) can be used to partially replace conventional reinforcement
Summary
It is possible to reduce waste disposal amounts by their re-using in construction building materials. The recycled steel fibres (RSF) from end-of-life tires differ from manufactured fibres with the stochastic length and diameter, and assorted shapes [6]. This is associated with the process of their reclamation and the type of the tires they are obtained from. Several attempts for substituting manufactured construction materials, used for reinforcing concrete beams (steel bars or fibres), with different types of natural or waste materials have been reported. The investigation described in the present paper is focused on finding the contribution of recycled tire fibres on the bending behaviour of beams To achieve this purpose, material and full-scale beam tests with concrete reinforced with conventional steel bars and two amounts of RSF were performed. The addition of the RSF reduced the slump flow diameter (Table 3)
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