Impact behaviour of nanomodified deflection-hardening fibre-reinforced concretes

Demirhan, Serhat; Yıldırım, Gürkan; Banyhussan, Qais Sahib; Koca, Kemal; Erdem, R. Tuğrul; Şahmaran, Mustafa

doi:10.1680/jmacr.18.00541

Cited by 28 publications

(5 citation statements)

References 52 publications

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“…These matrix enhancements also led to visible scratching of the fiber's surface and a slip-hardening behavior instead of the typically observed slip-softening behavior with steel fibers [25,26]. Wu et al and Demirhan et al [27,28] observed improvement in the matrix microstructure due to the addition of nanoparticles, which led to higher pullout loads on steel fibers.…”

Section: Materials and MIX Proportionsmentioning

confidence: 98%

On enhancing the mechanical behavior of ultra-high performance concrete through multi-scale fiber reinforcement

Ragalwar¹,

Heard²,

Williams³

et al. 2021

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Steel fibers are typically used in ultra-high performance concretes (UHPC) to impart flexural ductility and increase fracture toughness. However, the mechanical properties of the steel fibers are underutilized in UHPC, as evidenced by the fact that most of the steel fibers pull out of a UHPC matrix largely undamaged during tensile or flexural tests. This research aims to improve the bond between steel fibers and a UHPC matrix by using steel wool. The underlying mechanism for fiber-matrix bond improvement is the reinforcement of the matrix tunnel, surrounding the steel fibers, by steel wool. Single fiber pullout tests were performed to quantify the effect of steel wool content in UHPC on the fiber-matrix bond. Microscopic observations of pulled-out fibers were used to investigate the fiber-matrix interface. Compared to the control UHPC mixture with no steel wool, significant improvement in the flexural behavior was observed in the UHPC mixtures with steel wool. Thus, the addition of steel wool in steel fiber-reinforced UHPC provides multi-scale reinforcement that leads to significant improvement in fiber-matrix bond and mechanical properties of UHPC.

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Section: Materials and MIX Proportionsmentioning

confidence: 98%

On enhancing the mechanical behavior of ultra-high performance concrete through multi-scale fiber reinforcement

Ragalwar¹,

Heard²,

Williams³

et al. 2021

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“…In normal concrete, initial microcracks are predominantly found at the interface between the cement mortar and aggregate. Upon impact, these microcracks do not have sufficient time to expand along the path of least resistance, instead, they propagate directly www.nature.com/scientificreports/ through the aggregate, resulting in macroscopic cracks 52 . Consequently, normal concrete specimens exhibit crush damage.…”

Section: Failure Modesmentioning

confidence: 99%

Study on static and dynamic mechanical properties and microstructure of silica fume-polypropylene fiber modified rubber concrete

Han,

Pang,

et al. 2024

Sci Rep

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Through tests and micro-observations, the static and dynamic mechanical properties and microstructure of rubber concrete samples modified with varying amounts of silica fume and polypropylene fiber content were explored. The results indicate that incorporation of silica fume and polypropylene fiber can effectively enhance the performance of rubber concrete. Moreover, at 10% and 0.1% of silica fume and polypropylene fiber content respectively, rubber concrete’s compressive strength, splitting tensile strength, flexural strength, and dynamic compressive strength reached maxima. Furthermore, microstructure characteristic analysis indicated that inadequate adhesion between rubber particles and the matrix is responsible for compromised bearing capacity in unmodified rubber concrete. However, with the addition of silica fume and polypropylene fiber, the fiber binds the rubber particles closely with the matrix, while the silica fume fills the gaps between the matrix components. This combination results in rubber concrete with a denser internal structure and enhances its bearing capacity significantly.

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“…Thus, the stress-strain relationships for both compression and tension loading are obtained by formulas [3] and [4]. In these formulas, E 0 , are initial elastic stiffness of the material, equivalent plastic strain in compression and tension respectively (18).…”

Section: Numerical Analysismentioning

confidence: 99%

Experimental and numerical study of fiber reinforced concrete beams in four-point bending

Erdem

2021

Cem. Wapno Beton

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In this study, the behavior of concrete beams with and without fiber was investigated. In the experimental part, a total of 16 beam specimens were manufactured having different section sizes. 12 specimens were reinforced with synthetic fibers, that provide toughness, impact, and fatigue strength to concrete. The fiber ratios of the samples varied between 0% and 0.20% by mass. The samples were subjected to a four-point bending test to obtain the maximum load and displacement values, until they reached the failure modes. Subsequently, the beam samples were modelled in the Abacus finite element analysis software. Due to the comparison of experimental and numerical values and stress distributions of the specimens, it is seen that numerical analysis could be an option when investigating the behavior of beams with different dimensions in four-point bending.

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Impact behaviour of nanomodified deflection-hardening fibre-reinforced concretes

Cited by 28 publications

References 52 publications

On enhancing the mechanical behavior of ultra-high performance concrete through multi-scale fiber reinforcement

On enhancing the mechanical behavior of ultra-high performance concrete through multi-scale fiber reinforcement

Study on static and dynamic mechanical properties and microstructure of silica fume-polypropylene fiber modified rubber concrete

Experimental and numerical study of fiber reinforced concrete beams in four-point bending

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