Fiber–Matrix Interactions in Fiber-Reinforced Concrete: A Review

Abbas, Yassir M.; Khan, Mohammad Iqbal

doi:10.1007/s13369-016-2099-1

Cited by 59 publications

(22 citation statements)

References 45 publications

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“…The single-fiber pull-out test usually determines the local mechanical properties of the interface between fiber and matrix, since it measures the uniaxial tensile pull-out load and corresponding slippage [6]. Steel fiber is the most widely used fiber in the civil engineering industry [7].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and bonding behavior of fiber-mortar interface in fiber-reinforced concrete

Chen

et al. 2020

Construction and Building Materials

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The interfacial properties between fiber and matrix play a critical role in the overall mechanical responses of composite materials. In this paper, the glass fiber-mortar interfacial microstructure in fiber reinforced concrete (FRC) is visualized and characterized using X-ray microscopy. Additionally, three types of fiber-mortar interface (glass fiber, high modulus polyvinyl alcohol (PVA) fiber, and basalt fiber) are analyzed by scanning electron microscopy and energy dispersive X-ray spectroscopy. The results revealed a lot of microcracks along with the glass fiber-mortar interface; moreover, the hydration product of the glass/PVA/basalt fiber-mortar interface was much lower than that of the mortar matrix. Because microcracks or lower hydration product have such a negative effect on the interfacial bonding between fiber and mortar, the objective of this paper was to provide an analysis of this problem through extensive testing of their bonding properties. Specimens made of three types of fiber were tested along with three different mortar types were tested under tensile stress and a combined stress state to investigate the interfacial bond properties between fiber and mortar. Results show that both of the tensile and shear bond strength of the interface were not only improved by stronger mortar matrix, but also significantly affected by fiber type. Furthermore, when the 2 interface failed by slipping along the interfacial area, the interface showed an increasing shear bond strength with the increase of compressive stress. This was not the case when failure was due to the crushing of mortar. Finally, the FRC splitting tensile strength was tested to demonstrate the bonding mechanism effects on the FRC mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Microstructure and bonding behavior of fiber-mortar interface in fiber-reinforced concrete

Chen

et al. 2020

Construction and Building Materials

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“…The compressive strength only improved by 0-25% when using fibre reinforcement at the previously mentioned volume ratio. 5,6 However, the compressive strength was greatly improved. 7 SFRC studies have demonstrated that the tensile strength can be improved.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the tensile and flexural mechanical properties of directionally distributed steel fibre-reinforced concrete

Cui

Cao

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part L:

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Directionally distributed steel fibre-reinforced concrete has been proposed as a novel concrete because of its high tensile strength and crack resistance in specific directions. Based on the existing studies of the effect of the fibre direction on the mechanical properties of fibre-reinforced concrete, the authors in this paper performed further studies of the mechanical properties of directionally distributed steel fibre-reinforced concrete by conducting split tensile and bending tests. The split tensile strength of the directionally distributed fibre-reinforced concrete clearly exhibited anisotropy. The split tensile strength perpendicular to the fibre direction was much higher than that parallel to the fibre direction. The split tensile strength perpendicular to the fibre direction was almost twice the tensile strength of plain concrete. The flexural performance of directionally distributed fibre-reinforced concrete in the fibre direction significantly improved compared to that of randomly distributed fibre-reinforced concrete. Specifically, the flexural strength increased by as much as 97%. Gravity resulted in a deviation in the tensile properties of concrete prepared by manually and directionally placing fibres in a layered casting process. The test results can be utilised in subsequent concrete designs. The conclusions reached in this paper provide comprehensive mechanical design parameters for the application of directionally distributed fibre-reinforced concrete.

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“…Otherwise, if the bond is too strong, the fibre rupture may happen before they can fully contribute to the post-crack strength [13]. Therefore, the investigation of the bond mechanisms is a key factor to understand the tensile behaviour of SFRCCs [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Steel fibres for the use in cementitious materials are available in a number of length, diameter, and shape and metal types [15]. There are various forms of mechanical anchorage, such as hooks, buttons and paddles formed at the end of the fibre or along fibre length such as polygonal twisted, crimped and indented to introduce a mechanical contribution to overall pull-out behaviour [17].…”

Section: Introductionmentioning

confidence: 99%

Anchorage mechanisms of novel geometrical hooked-end steel fibres

Abdallah

Fan

2017

Mater Struct

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This study is aimed at fully understanding the anchorage mechanisms of steel fibres with novel hook geometries, e.g. 4DH and 5DH fibres, which were subjected to pull-out loading. The fibres were also embedded in four different matrixes with a compressive strength ranging from 33 to 148 MPa. The results showed that the anchorage and pull out behaviour was not only dependent on the geometry of the hooked end of steel fibres, but also closely related to the characteristics of matrix. Both maximum pullout load and total pull-out work of 5DH fibre were considerably higher than those of 4DH and the controlled 3DH fibres for all matrixes. All fibres embedded in normal strength concrete and medium strength concrete matrixes were completely pulled out without the occurrence of full deformation and straightening of the hook, while the controlled 3DH and 4DH fibres ruptured at hook portion when embedded in ultra-high performance mortar matrix. To fully utilize the high mechanical anchorage, 5DH fibres should be used for reinforcing high or ultra-high performance matrixes in practice.

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Fiber–Matrix Interactions in Fiber-Reinforced Concrete: A Review

Cited by 59 publications

References 45 publications

Microstructure and bonding behavior of fiber-mortar interface in fiber-reinforced concrete

Microstructure and bonding behavior of fiber-mortar interface in fiber-reinforced concrete

Experimental study of the tensile and flexural mechanical properties of directionally distributed steel fibre-reinforced concrete

Anchorage mechanisms of novel geometrical hooked-end steel fibres

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