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Title: An experimental investigation on the post-cracking behaviour of Recycled Steel Fibre Reinforced Concrete

Author(s): Frazão, C.; Barros, J.; Bogas, A.; Pilakoutas, K.; de Sousa, C.M.

Publication: Symposium Paper

Volume: 343


Appears on pages(s): 262-271

Keywords: Recycled steel fibres, industrial steel fibres, RSFRC, ISFRC, post-cracking behaviour.


Date: 10/1/2020

Steel fibres resulting from the industry of tyre recycling can be efficiently employed for the reinforcement of concrete structures. Recycled Steel Fibre Reinforced Concrete (RSFRC) is a promising candidate with technical, environmental and economic benefits for the development of ductile, high strength and durable structural elements. The heterogeneity of the geometry of each Recycled Steel Fibre (RSF) due to the recycling process of the tires, can provide a plurality of strengthening mechanisms to concrete that promote efficiency and durability, as long as the RSFRC composition is carefully adjusted to the presence of RSF. For assessing the potentialities of recycled steel fibres (RSF) as concrete reinforcement, an experimental program was performed in the present study by comparing the following properties of concrete reinforced with industrial steel fibres (ISF) and with RSF: compressive strength, modulus of elasticity, flexural strength, flexural toughness and indirect tensile strength. The obtained results suggest that RSF reinforcement can significantly reduce the brittle behaviour of concrete by improving its toughness and post-cracking resistance. For the adopted industrial and recycled fibres, the last ones have not presented inferior post-cracking strengthening performance than the first ones.