Impact of Steel Fibers on Workability and Properties of UHPC

Rydval, Milan; Bittner, Tomáš; Kolı́sko, Jiřı́; Nenadálova, Šárka

doi:10.4028/www.scientific.net/ssp.249.57

Cited by 6 publications

(2 citation statements)

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“…The composition of all samples is shown in Table 1. Workability is one of the basic factors that can determine the rheological parameters of UHPC [10]. A miniflow desk test (see Fig.…”

Section: Uhpc Sample Preparationmentioning

confidence: 99%

Model fluids substituting fresh UHPC mixtures flow behaviour

et al. 2023

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Carboxymethylcellulose (CMC) and ultrasound gel (USG) seem to be suitable clear model fluids to substitute real ultra-high-performance concretes (UHPCs), enabling experimental monitoring of events occurring within these mixtures at similar flow behaviour. USG is eligible for UHPC mixtures with significant yield stress. CMC having a suitable concentration is better for UHPCs exhibiting indistinct yield stress. The rheological behaviour of real UHPC mixtures as well as substituting model fluids was measured using a non-standard system consisting of a vessel stirred by an anchor or a screw agitator. In addition, a standard rotational rheometer system with concentric cylinder geometry was used for optimization of the above-mentioned method of measurement and also for measuring the rheological parameters of the substituting model fluids. This article deals with the methodology for measuring the rheological properties of these substances and presents the results of the measurements using flow curves and rheological models.

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“…The composition of all samples is shown in Table 1. Workability is one of the basic factors that can determine the rheological parameters of UHPC [10]. A miniflow desk test (see Fig.…”

Section: Uhpc Sample Preparationmentioning

confidence: 99%

Model fluids substituting fresh UHPC mixtures flow behaviour

et al. 2023

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“…The consistency of the matrix was reduced as more fibers were added due to its increasing consistency that was influenced by the gain of internal friction between components, a fact that is related to the shape and surface area of fibers. Moreover, metal fibers affect the mixture's consistency, making it necessary to determine a maximum percentage of fibers that can be added to the matrix (Rydval et al, 2016).…”

Section: Mixture Consistencymentioning

confidence: 99%

Estudio del comportamiento mecánico del hormigón de ultra-altas prestaciones (UHPC) reforzado con fibras híbridas y con consumo reducido de cemento

et al. 2019

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This article evaluated mechanical behavior of ultra-high performance concrete (UHPC) reinforced with hybrid steel and polypropylene fibers, with cement consumption of 250 kg/m³ and application of confining pressure in fresh state. The consistency of the mixture was analyzed, as well as mechanical properties of compressive strength, flexural strength and toughness. The percentages of hybridization were 50 to 100% of metal fibers and 0 to 50% of polypropylene fibers. Results showed that the compressive strength of the composite was 180 MPa (26100 psi), despite its low cement consumption of 250 kg/m³ (2.08 lb/gal), with 80% steel fibers and 20% polypropylene fibers. The combination of fibers increased the mixture's toughness. For the composition with 80% steel fibers and 20% polypropylene fibers, the strength for large deformations increased by 191% compared with the mixture with 100% steel fibers, pointing out the benefits of hybridization.

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Flexural response characteristics of ultra‐high performance concrete made with steel microfibers and macrofibers

Karim

Shafei

2021

Structural Concrete

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Ultra‐high performance concrete (UHPC) is increasingly used for various engineering applications, owing to its superior strength properties. Such properties, however, can be accompanied by workability issues, especially if the dosage of steel fibers is significantly increased. As a potential solution, this study explored the use of a combination of steel microfibers and macrofibers through a holistic experimental testing program. This was to understand the effects of steel fiber combinations on the workability and flexural strength of various UHPC mixtures. The microfibers were investigated for five different dosages from 1.0% to 3.0% (with an increment of 0.5%). In parallel, two mixtures were prepared with a 2.0% dosage of macrofibers in the form of twisted wire and hooked fibers. At the next stage, six additional mixtures were prepared with a combination of microfibers and macrofibers of various dosages. Further to the measurements extracted from the workability and flexural strength tests, digital image correlation (DIC) analyses were employed to obtain firsthand information about the widths and depths of cracks observed in the flexural specimens tested under an increasing load. The outcome of this study showed how a combination of microfibers and macrofibers can contribute to improving the flexural response characteristics of UHPC, especially without having to increase the dosage of steel fibers to the ranges that can adversely affect the mixture's workability.

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Impact of Steel Fibers on Workability and Properties of UHPC

Cited by 6 publications

References 0 publications

Model fluids substituting fresh UHPC mixtures flow behaviour

Model fluids substituting fresh UHPC mixtures flow behaviour

Estudio del comportamiento mecánico del hormigón de ultra-altas prestaciones (UHPC) reforzado con fibras híbridas y con consumo reducido de cemento

Flexural response characteristics of ultra‐high performance concrete made with steel microfibers and macrofibers

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