Influence of fiber size on mechanical properties of strain-hardening fiber-reinforced concrete

Nguyen, Duy‐Liem; Nguyen, Thac-Quang; Nguyen, Hung Ngoc

doi:10.31814/stce.nuce2020-14(3)-08

Cited by 6 publications

(5 citation statements)

References 16 publications

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“…69,78 Studies on the reinforcement of concrete structures with aramid fibers (AF) have also been sought through, it should be noted that AF looses considerable strength in alkaline environments. [87][88][89] Moreover, AF tends to absorb water, which leads to a deterioration of fiber stiffness. 82,83 Nonetheless, progress is driven by research continuously.…”

Section: Fiber Materialsmentioning

confidence: 99%

Textile reinforcement structures for concrete construction applications––a review

Friese

Scheurer

Hahn

et al. 2022

Journal of Composite Materials

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The use of non-metallic, textile reinforcement structures in place of steel reinforcement is a key component in making concrete constructions more sustainable and durable than they currently are. The reason for this is the corrosion resistance of textile reinforcements, which makes it possible to reduce the thickness of the concrete cover and at the same time extend the service life of concrete structures. This reduces the amount of cement required and thus also the emission of the greenhouse gas carbon dioxide (CO2). By means of textile manufacturing technologies, customized, load-adapted reinforcement topologies can be adjusted to the requirements of highly stressed and well-designed concrete components. The objective of this paper is to give an overview of recent research literature dedicated to textile reinforcement structures that are already used for concrete applications in the construction industry as well as those currently under development. Therefore, textile reinforcement structures, which are divided into one-, two- and three-dimensional topologies, as well as common materials used for textile-reinforced concrete (TRC) are reviewed. Most research has so far been devoted to two-dimensional textile reinforcement structures. Furthermore, novel approaches to the fabrication of textile reinforcement structures for concrete applications based on robotic yarn deposition technologies are addressed.

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Section: Fiber Materialsmentioning

confidence: 99%

Textile reinforcement structures for concrete construction applications––a review

Friese

Scheurer

Hahn

et al. 2022

Journal of Composite Materials

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“…The fiber size and aspect ratio were reported to importantly affect the tensile behaviors of HPFRC [19,20]. The combination between short and long fibers could create the synergy effect on enhancing mechanical properties of HPFRC [13,21,22].…”

Section: Materials and Beam Preparationmentioning

confidence: 99%

“…Direct tensile strength of HPFRC was 9.81 MPa [13] 164 165 The fiber size and aspect ratio were reported to importantly affect the tensile 170 behaviors of HPFRC [19,20]. The combination between short and long fibers could 171 create the synergy effect on enhancing mechanical properties of HPFRC [13,21,22] 172 Hence, the HPFRC placed in beams were used hybrid fibers: long hooked fibers with 173 volume fraction of 1.0% and short smooth fibers with volume fraction of 0.5%.…”

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confidence: 99%

Span length-dependent load-carrying capacity of normal concrete - HPFRC beams

Nguyen

Ngo

Tran

2021

STCE

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The dependence of load-carrying capacity on span length of beams, which contained a combination of normal strength concrete (NC) - High-performance fiber-reinforced concrete (HPFRC), was investigated in this study. The used HPFRC contained 1.0 vol.% long hooked blended with 0.5% short smooth fibers. Two types of span length were designed as 300 mm and 450 mm while dimensions of beam sections were identical with depth × width of 150 × 150 mm2. Each span included five types of partial structural materials as follows: Short 1 and Long 1 had no reinforcement with full of section using HPFRC, Short 2 and Long 2 had reinforcements with a full of section using HPFRC, Short 3 and Long 3 had reinforcements with a half of section using HPFRC at beam bottom, Short 4 and Long 4 had reinforcements with a third of section using HPFRC at beam bottom, Short 5 and Long 5 had reinforcements with a half of section using HPFRC at beam top. All beams were tested under three-point bending test. The shorter beam generally exhibited the greater load-carrying capacity than the long beam using same section type. The shear failure mode was dominant in case of the span/depth ratio less than 3. The HPFRC located at bottom of beam created the more effectiveness for enhancement of load-carrying capacity and stiffness of the beam, in comparison with the HPFRC placed at top of beam. The most effective zone of beam for HPFRC strengthening was at extreme tension fiber. Keywords: high-performance; composite beam; shear failure; bending resistance; load-carrying capacity.

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“…These characteristics related to the fiber-matrix interfacial bond strength. 11,12 Ferrara et al 13 stated that the tensile performance of HPFRC was highly affected by fiber orientation and distribution, while Zheng 14 indicated that the increase of tensile strength and elastic modulus of fibers correlated to the improved resistances of concrete. Besides, the micro fiber with its length less than 0.1 mm could be higher homogenous distributed and thus result the greater packing density of concrete.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behaviors and their correlations of ultra‐high‐performance fiber‐reinforced concretes with various steel fiber types

Nguyen

Thai

Nguyen

et al. 2022

Structural Concrete

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The mechanical behaviors and their correlations of ultra‐high‐performance fiber‐reinforced concretes (UHPFRCs) with various steel fiber types were highlighted in this investigation based on the experiment combined with sectional analysis. Under compression, five fiber types with 2.0 vol% were investigated as follows: no fibers (PL), long twisted fibers (LT), long hook fibers (LH), long smooth fibers (LS) and hybrid fibers (HB, 1% twisted blended with 1% short smooth fibers). The LT revealed the highest compressive strength and strain capacity whereas the PL exhibited the lowest ones. Compared to the PL, the HB produced significant enhancements in strength, elastic modulus and deformation capacity under compression, tension and bending. The order in effectiveness of strength enhancement owing to additional hybrid fibers was as follows: bending > tensile > compressive loading. Based on sectional analyses, the enhancements in moment resistance of UHPFRC beams were closely correlated with higher compressive strength and smaller compressive strain capacity. Besides, the condition for first cracking at the bottom of UHPFRC beam was explored. Finally, a simplified model, based on the tensile response of UHPFRCs, for predicting the flexural resistances of the UHPFRC beams was proposed and validated.

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Influence of fiber size on mechanical properties of strain-hardening fiber-reinforced concrete

Cited by 6 publications

References 16 publications

Textile reinforcement structures for concrete construction applications––a review

Textile reinforcement structures for concrete construction applications––a review

Span length-dependent load-carrying capacity of normal concrete - HPFRC beams

Mechanical behaviors and their correlations of ultra‐high‐performance fiber‐reinforced concretes with various steel fiber types

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