China
Africa
Explore chapters and articles related to this topic
Finite Element Application of a Constitutive Model for Fiber Reinforced Concrete/Mortar
Published in R. N. Swamy, Fibre Reinforced Cement and Concrete, 1992
The incorporation of steel fibers into concrete or mortar modifies a large number of its mechanical properties, particularly when fibers that develop a good mechanical bond are used. As observed experimentally, fibers that are randomly distributed act as microcrack arrestors, improving the ductility, failure toughness, postcracking strength, impact resistance, and fatigue strength, while reducing the number of cracks and the mean crack width. Typically, the amount of steel fibers varies between 0.5 and 2.0 percent, by volume. Examples of the application of steel FRC include slabs, bridge decks, pavement overlays, blast resistant structures, tunnel reinforcement, and precast bridge segments, spillways and bridge piers. In addition, a number of experimental programs have studied FRC’s potential for use in seismic resistant structures.
Multiscale modeling of steel fiber reinforced concrete based on the use of coupling finite elements and mesh fragmentation technique
Published in Günther Meschke, Bernhard Pichler, Jan G. Rots, Computational Modelling of Concrete Structures, 2018
L.A.G. Bitencourt, Y.T. Trindade, T.N. Bittencourt, O.L. Manzoli, E.A. Rodrigues
The main benefits of the addition of steel fibers in concrete are directly related to their ability to transfer stresses across cracks. Before the addition of steel fibers and after matrix cracking, the tensile stress immediately decreases. However, after the addition of a certain volume of fibers and after matrix cracking, the fibers are able to maintain a certain load bearing capacity, avoiding an abrupt failure of the composite.
Uneven distribution of interfacial bond stress in steel fiber-reinforced concrete-encased steel composite structures
Published in Structure and Infrastructure Engineering, 2022
Kai Wu, Shiyuan Qian, Huiming Zheng, Yanjie Zhang, Ruizhe Zhu
Steel fiber reinforced concrete (SFRC) is a type of composite material fabricated by adding steel fiber into RC at a determined ratio. The wide application of SFRC in buildings, dams, and bridges has attracted global interest in recent years (River et al., 2022; Sharma, Arora, Kumar, Daniel, & Sharma, 2018; Tang & Wilkinson, 2020). The addition of steel fibers in concrete could not only improve the tensile performance of the material but also enhance the dynamic behaviors of structures under extreme loads, which is mainly attributed to the fiber bridging effect that effectively delays the emergence and elongation of cracks in concrete (Hamoda, Emara, & Mansour, 2019; Mezzal, Al-Azzawi, & Najim, 2021; Papachristoforou, Anastasiou, & Papayianni, 2020; Zampieri, Simoncello, Libreros, & Pellegrino, 2020; Zhang, Lin, & Chen, 2021).
Feasibility Study of Reusing Wash Water and Steel Fibre Simultaneously on Workability, Mechanical Properties and Fracture Toughness of Concrete
Published in Australian Journal of Civil Engineering, 2022
M. Taghizadeh, G. Asadollahfardi, A. M. Salehi, J. Akbardoost
The function of steel fibers in concrete is generally to increase ductility. Steel fiber work in concrete begins after the first failure and prevents the development of cracks and complete rupture in tension and flexural. Therefore, the results of the tensile and flexural strength and toughness using fibers were confirmed by Figure 8.
Influence of steel fibers on the flexural performance of concrete incorporating recycled concrete aggregates and dune sand
Published in Journal of Sustainable Cement-Based Materials, 2021
Nancy Kachouh, Hilal El-Hassan, Tamer El-Maaddawy
The variation of f1 and fp as a function of RCA replacement percentage and SF volume fraction is shown in Figure 6. The discussion is mainly on fp, as it is more indicative of the flexural strength. Compared to the control (R0SF0), plain concrete mixes made with 30, 70, and 100% RCA exhibited a decrease in the peak strength, fp, by 16, 46, and 51%, respectively [Figure 6(b)]. As was the case of compressive strength in the previous section, this reduction in strength was due to the inferior properties of RCA, weak interface zone between the old mortar attached to RCA and the new mortar, and rough and porous structure of RCA. Previous studies reported a similar reduction in flexural strength with an increase in RCA replacement percentage [76,77]. In comparison, the peak strength of steel fiber-reinforced concrete mixes, regardless of RCA replacement, equivalent or superior to that of NA-based control. This shows that the negative impact of replacing natural aggregates by recycled counterparts could be countered by steel fiber incorporation. Also from Figure 6(b) and for mixes made with 30% RCA replacement percentage, the addition of 1, 2, and 3% vf resulted in an increase in the peak strength by 23, 63, and 113%, respectively, compared to its plain counterpart (R30SF0). For similar steel fiber additions to mixes made with 70% RCA, fp increased by 83, 145, and 227%, respectively. Concrete mixes with 100% of NA being replaced by RCA, 1, 2, and 3% vf resulted in an increase in fp of 96, 160, and 224%, respectively. Thus, it could be noted that the flexural peak strength increased by an average 56% for every 1% steel fiber added, regardless of RCA replacement percentage. A similar increasing trend was observed for the first peak strength, f1, for mixes made with the addition of 2 and 3% vf compared to plain concrete mixes [Figure 6(a)]. It is thus apparent that steel fibers provided concrete with better integrity due to their bridging effect and an improved flexural performance by reducing the development of microcracks.