The influence of fibre orientation in self-compacting concrete on 4-point bending strength

Herrmann, Heiko; Goidyk, Oksana; Naar, Hendrik; Tuisk, Tanel; Braunbrück, Andres

doi:10.3176/proc.2019.3.12

Cited by 10 publications

(9 citation statements)

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“…The work by Herrmann and Lees 25 indicates that the surface properties of the formwork also need to be taken into account when designing the casting technology for UHPFRC specimens. Due to the observed wall effects, it remains an open question to which extent our findings can be generalized to larger samples, see Herrmann et al 26 for a discussion. To investigate this question in the framework presented here, larger samples have been produced and will be analyzed in a subsequent study.…”

Section: Resultsmentioning

confidence: 93%

Influence of production parameters on the fiber geometry and the mechanical behavior of ultra high performance fiber‐reinforced concrete

Maryamh

Hauch

Redenbach

et al. 2020

Structural Concrete

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In this paper, the relationship between production parameters of ultra high performance fiber‐reinforced concrete (UHPFRC) and the spatial distribution and orientation of the steel fibers is investigated. UHPFRC specimens with varying fiber diameter, fiber volume fraction, and rheology of the mixture are produced. Additionally, casting is performed from the side or the middle of the formwork. Imaging by micro computed tomography allows for a statistical analysis of the spatial arrangement of the fibers in the test specimens. The flexural behavior and the load capacity of the specimens are analyzed by four point bending tests. The results of the bending tests are well explained by characteristics of the fiber systems determined from the image data.

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Section: Resultsmentioning

confidence: 93%

Influence of production parameters on the fiber geometry and the mechanical behavior of ultra high performance fiber‐reinforced concrete

Maryamh

Hauch

Redenbach

et al. 2020

Structural Concrete

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“…The SCC beams behaved brittle as expected with little variation of the maximum load and displacement. The diagram for the SCC beams can be found in Herrmann et al (2019c). Figure 3 shows the force-displacement curves of the fourty tested fiber-concrete beams, the curves show a large variability in the post-cracking behavior.…”

Section: Results and Conclusionmentioning

confidence: 99%

“…Specifically, from the slab of ordinary concrete 10 beams of dimensions 100 cm × 9.5 cm × 10 cm have been cut out and the slab of fiber concrete has been cut into 40 beams of size 100 cm × 9.5 cm × 10 cm. A principal disposition of the specimens is depicted in Figure 1 and a detailed description of the experimental setup can be found in (Herrmann, Goidyk, Naar, Tuisk, & Braunbrück, 2019c). (Herrmann et al, 2019c) To analyze the difference between the mechanical properties of beams taken from different positions of a large slab, 4-point bending tests were performed by using the universal hydraulic bending machine EU100, as shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

“…A principal disposition of the specimens is depicted in Figure 1 and a detailed description of the experimental setup can be found in (Herrmann, Goidyk, Naar, Tuisk, & Braunbrück, 2019c). (Herrmann et al, 2019c) To analyze the difference between the mechanical properties of beams taken from different positions of a large slab, 4-point bending tests were performed by using the universal hydraulic bending machine EU100, as shown in Figure 2. The testing beams were maintained with two roller supports on the distance of 90 cm, and 5 cm from each supports to the edges of the specimens.…”

Section: Methodsmentioning

confidence: 99%

“…The force-displacement curves that were obtained by the analysis of the data after the four-point bending tests of the SFRSCC beams are presented in Figure 3. image reproduced from (Herrmann et al, 2019c)…”

Section: Methodsmentioning

confidence: 99%

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Initial results of local strength analysis of a fiber concrete plate by 4-point bending tests

Goidyk

Herrmann

2019

Modern Building Materials, Structures and Techniques (MBMST)

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The analysis of the post-cracking behavior of a large plate cast of fiber concrete shows a large variability due to the fiber alignment and dispersion. Therefore, one can expect, that the bending strength and other material parameters depend on the position in the plate. This means that the position the samples for testing are taken from may play a significant role in assessing the mechanical properties and strength of composite materials. Often, the investigation of fiber concrete properties have been performed by testing small size beams. The results can be influenced by the boundary restrictions, such as wall-effect, which influences the fiber distribution. In this study the four-point bending strength of beams cut out of a large plate was investigated, the results represent the local strength of the plate in this particular place. The fiber orientation and distribution have been evaluated by X-ray Computed Tomography and Image Analysis Method. The results of the experiments have shown that the position of the beam inside of a large-size plate has a strong influence on the mechanical properties and post-cracking behavior. The analysis of the obtained outcomes proposes the following conclusions: the beams that were located near the edges of the formwork have shown a strong, strain-hardening behavior, and the beams that were located on the way of the casting bucket (a zone of the high turbulence/perturbation/disturbance) have shown a weak, strain-softening behavior.

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Influence of specimen size on the fibre geometry and tensile strength of ultra‐high‐performance fibre‐reinforced concrete

Maryamh

Hauch

Redenbach

et al. 2021

Structural Concrete

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The influence of the specimen size of ultra‐high‐performance fibre‐reinforced concrete samples on the spatial distribution and orientation of the steel fibres is investigated. Specimens of varying size are produced by using the same protocol. They are imaged by micro‐computed tomography to perform a statistical analysis of the spatial arrangement of the fibres. The tensile strength of the specimens is measured by tensile tests on subspecimens of equal size. The results are correlated to geometric characteristics of the fibre systems determined from the image data. Increasing the specimen size results in a larger variability of the local fibre geometry. This effect was most prominent when increasing the height of the specimens.

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The influence of fibre orientation in self-compacting concrete on 4-point bending strength

Cited by 10 publications

References 0 publications

Influence of production parameters on the fiber geometry and the mechanical behavior of ultra high performance fiber‐reinforced concrete

Influence of production parameters on the fiber geometry and the mechanical behavior of ultra high performance fiber‐reinforced concrete

Initial results of local strength analysis of a fiber concrete plate by 4-point bending tests

Influence of specimen size on the fibre geometry and tensile strength of ultra‐high‐performance fibre‐reinforced concrete

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