Investigation into the mechanical properties of structural lightweight concrete reinforced with waste steel wires

Abstract

The study of concrete incorporating different waste fibres has started to increase rapidly due to economic reasons and positive environmental effects. In the study reported here, waste steel wires from steel reinforcement and used formworks were blended with structural lightweight concrete, with the aim of replacing commercial steel fibres of controlled quality with recycled fibres. Compression, tensile, flexural and impact tests were performed to assess the mechanical properties of 28 d old concrete specimens reinforced with mixed waste steel wires, mixed steel fibres as well as plain concrete. The percentages of fibres examined in the fibre reinforced concrete (FRC) specimens were 0 . 25%, 0 . 50% and 0 . 75% (volume fraction of the concrete). With varying fibre contents, similar trends were observed in all the types of FRCs studied. It was thus concluded that waste steel wires could be used as a suitable alternative to industrial steel fibres for structural lightweight concrete applications. Notation ddiameter of concrete cylinder I 5 , I 10 , I 20 toughness indices l length of concrete cylinder P maximum applied load indicated by the testing machine R 5,10 , R 10,20 residual strength factors T splitting tensile strength V f fibre content (% volume fraction of concrete)

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