Mechanical properties of reactive powder concrete containing industrial and waste steel fibres at different ratios under compression" (2017). Faculty of Engineering and Information Sciences-Papers: Part B. 519.

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Behaviour of fibre-reinforced RPC columns under different loading conditions Behaviour of fibre-reinforced RPC columns under different loading conditions

An experimental program was conducted to investigate the effect of inclusion of steel fibres on the behaviour of Reactive Powder Concrete (RPC) columns. Three different types of steel fibre were used: micro straight steel fibre (MF), macro deformed steel fibre (DF) and waste steel fibre (WF) recovered from discarded tyres. In addition, a hybridization of steel fibres was made up to produce waste-industrial hybridization (WHF) (MF, DF and WF). Twenty reinforced RPC column specimens were prepared and tested under axial concentric, eccentric and flexural loading. Results of testing demonstrated that the ultimate axial load and the corresponding axial deformation increased effectively by the addition of steel fibres, especially at the presence of MF. For the flexural loading, the inclusion of WF and WHF increased the energy absorption of specimens by 470% and 453%, respectively, in comparison with the corresponding reference specimens. Axial load-bending moment (P-M) interaction diagrams were carried out. Results of testing show that WF is a promising material for enhancing the behaviour of RPC under different loading conditions. Abstract 10 An experimental program was conducted to investigate the effect of inclusion of steel fibres 11 on the behaviour of Reactive Powder Concrete (RPC) columns. Three different types of steel 12 fibre were used: micro straight steel fibre (MF), macro deformed steel fibre (DF) and waste 13 steel fibre (WF) recovered from discarded tyres. In addition, a hybridization of steel fibres 14 was made up to produce waste-industrial hybridization (WHF) (MF, DF and WF). Twenty 15 reinforced RPC column specimens were prepared and tested under axial concentric, eccentric 16 and flexural loading. Results of testing demonstrated that the ultimate axial load and the 17 corresponding axial deformation increased effectively by the addition of steel fibres, 18 especially at the presence of MF. For the flexural loading, the inclusion of WF and WHF 19increased the energy absorption of specimens by 470% and 453%, respectively, in 20 comparison with the corresponding reference specimens. Axial load-bending moment (P-M) 21 interaction diagrams were carried out. Results of testing show that WF is a promising material 22 for enhancing the behaviour of RPC under different loading conditions. 23 24 25interactions.26 30 rated as a concrete with excellent strength and durability [1, 2]. This type of concrete enables 31 the designers to reduce the size of structural members such us columns in lower stories and 32 consequently reduces the self-weight of the structure. However, RPC is identified with its 33 excessive brittleness. It was reported that the increase in the compressive strength of the 34 concrete results in an increase in the brittleness of the concrete. 36Helices are normally used to confine the core of the concrete columns. However, for high 37 strength concrete, the transverse reinforcement confinement is less efficient than in normal 38 strength concrete when used in columns [3][4][5]. Furthe...

This paper presents analytical modelling of the axial-flexural behaviour of Reactive Powder Concrete (RPC) columns reinforced with and without steel fibres of different types (industrial and waste) in individual and hybrid forms. An analytical stress-strain model for unconfined RPC was used for the analysis of the axial loads and bending moments of the fibrous RPC columns. The layer-by-layer numerical integration method was used to calculate the axial load and bending moments in this study. The analytically developed axial load-bending moment (P-M) interaction diagrams were validated by using experimental results from the literature. A para-metric study was carried out to investigate the influence of the properties of steel fibres on the axial-flexural behaviour of fibrous RPC columns. It was found that the analytical unconfined stress-strain model used in this study well estimates the maximum axial loads and the maximum bending moments of the RPC columns reinforced with and without different types of steel fibres. Also, the influence of the properties of steel fibres is more pronounced at eccentric and flexural loading