Abstract
This paper presents the fibre-matrix interfacial properties of hooked end steel fibres embedded in ultra-high performance mortars with various water/binder (W/B) ratios. The principle objective was to improve bond behaviour in terms of bond strength by reducing the (W/B) ratio to a minimum. Results show that a decrease in W/B ratio has a significant effect on the bond-slip behaviour of both types of 3D fibres, especially when the W/B ratio was reduced from 0.25 to 0.15. Furthermore, the optimization in maximizing pullout load and total pullout work is found to be more prominent for the 3D fibres with a larger diameter than for fibres with a smaller diameter. On the contrary, increasing the embedded length of the 3D fibres did not result in an improvement on the maximum pullout load, but increase in the total pullout work.
Highlights
Nowadays one of the main challenges that the concrete industry facing; is how to improve the tensile strength and durability of mortar and concrete (Petrone et al 2016; Alberti et al 2014)
The reducing of water/binder ratio (W/B) ratio leads to a decrease in slump-flow diameter (SFD), while time to reach 500 mm spread (T500) is increased
The average compressive strength was remarkably enhanced for all ultra-high performance mortars (UHPMs) by decreasing W/B ratio (Table 3)
Summary
Nowadays one of the main challenges that the concrete industry facing; is how to improve the tensile strength and durability of mortar and concrete (Petrone et al 2016; Alberti et al 2014). The efficiency of fibres in transferring applied stresses is greatly dependent on the fibre-matrix interface properties of fibre reinforced concrete (FRC) (Abdallah et al 2016; Dinh et al 2016; Lu et al 2016; Tadepalli et al 2015). To improve the bonding strength of fibre and matrix interfaces, a number of modifications may be adopted. The test configuration is able to simulate the realistic case of cracking bridging by fibres in a FRC element (joo Kim, 2009). These test results could provide a comprehensive understanding on bond-slip characteristics and enable further improvement to fibre-matrix interfacial properties (Wille and Naaman 2010)
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