Effect of fiber hybridization on mechanical properties of concrete

He, Fengzhen; Biolzi, Luigi; Carvelli, Valter

doi:10.1617/s11527-022-02020-9

Cited by 20 publications

(8 citation statements)

References 38 publications

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“…Hybrid composites are composite materials made by combining two or more fibers in the same matrix, in which the fibers can be selected from natural fibers, artificial fibers, or synthetic fibers, and various fibers can be arranged in different layup sequences to optimize the performance of the composites. Compared with single-fiber-reinforced composites, hybrid composites have the advantages of reducing weight, lowering production costs, improving strength and stiffness, and improving impact resistance and fatigue resistance, which are widely used in aerospace, construction industry, health care, and other fields [ 16 , 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Study of Low-Velocity Impact Behavior of Hybrid Fiber-Reinforced Metal Laminates

Fang,

Sheng,

Lin

et al. 2024

Polymers

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In this paper, the low-velocity impact behavior and damage modes of carbon/glass-hybrid fiber-reinforced magnesium alloy laminates (FMLs-H) and pure carbon-fiber-reinforced magnesium alloy laminates (FMLs-C) are investigated using experimental, theoretical modeling, and numerical simulation methods. Low-velocity impact tests were conducted at incident energies of 20 J, 40 J, and 60 J using a drop-weight impact tester, and the load–displacement curves and energy–time curves of the FMLs were recorded and plotted. The results showed that compared with FMLs-C, the stiffness of FMLs-H was slightly reduced, but the peak load and energy absorption were both greatly improved. Finally, a finite element model based on the Abaqus-VUMAT subroutine was developed to simulate the experimental results, and the damage modes of the metal layer, fiber layer, and interlayer were observed and analyzed. The experimental results are in good agreement with the finite element analysis results. The damage mechanisms of two kinds of FMLs under low-velocity impacts are discussed, providing a reference for the design and application of laminates.

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Section: Introductionmentioning

confidence: 99%

Study of Low-Velocity Impact Behavior of Hybrid Fiber-Reinforced Metal Laminates

Fang,

Sheng,

Lin

et al. 2024

Polymers

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“…Furthermore, with continuous advancements in the study and development of concrete, it has become an indispensable material in modern construction due to its advantages, such as high-compressive strength, high density, low porosity, low cost and availability of raw materials [3][4][5] . However, compared to its compressive strength, its exural strength is relatively low, and its bending toughness is relatively weak, making it susceptible to brittle failure 6,7 . This limitation signi cantly impacts concrete application as shotcrete material in geotechnical engineering elds such as tunnels, slopes, foundation pits, and mines, especially in situations requiring higher resistance to exural strength and bending toughness 8 .…”

Section: Introductionmentioning

confidence: 99%

Experimental study and numerical simulation of the effect of different fiber types on the basic mechanical properties of shotcrete

Liu,

WANG,

Liu

et al. 2024

Preprint

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The enhancement effects and mechanisms of different types of fibers on the basic mechanical properties of concrete were analyzed, aiming to guide the selection of suitable fiber types and dosages for grouting projects. This study selected steel fibers, glass fibers, and polypropylene fibers as research subjects. Through laboratory tests, numerical simulations, and field experiments, it investigated the enhancement laws of flexural and compressive strengths of concrete with different dosages of these three fibers. The study shows that: (1) After 28 days of curing, the flexural strength of concrete with steel fibers, glass fibers, and polypropylene fibers peaked at dosages of 2.0%, 1.5%, and 2.0%, respectively. Compared to plain concrete, the increases were 118.6%, 42.86%, and 138.6%, respectively. The compressive strength of concrete increased the most with dosages of 0.5%, 1.0%, and 2.0% for steel fibers, glass fibers, and polypropylene fibers, respectively, with increases of 2.13%, 10%, and 18.3%. It can be seen that the impact of these three fiber types on the compressive strength of concrete is significantly less than their impact on flexural strength. For enhancing flexural strength, the order is polypropylene fibers > steel fibers > glass fibers. Conversely, for compressive strength, the order is polypropylene fibers > glass fibers > steel fibers. (2) Based on ABAQUS numerical simulations, microscopic analysis indicates that fibers, due to their high yield capacity, enhance the connections between concrete elements, reduce stress concentration, and improve the mechanical properties of concrete. (3) For shotcrete, due to its high flexural strength requirements and the tendency of steel and glass fibers to agglomerate, polypropylene fibers at a dosage of 2.0% were preferred. (4) Using the optimal dosage, it was successfully applied to the wet shotcrete support of a return air shaft in a mine, where the maximum deformation of the roof and sides of the tunnel remained within allowable limits, meeting the normal usage requirements of the tunnel. The research findings can offer guidance and reference for the selection and further application of shotcrete.

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“…Compared with primary concrete, secondary concrete is widely used in mass hydraulic concrete because of its lower hydration heat. The crack problem of mass concrete not only affects project quality but also leads to security risks [1][2][3][4][5]. The addition of fibers to a concrete substrate is an important method of improving the brittleness characteristics of concrete and controlling the crack width .…”

Section: Introductionmentioning

confidence: 99%

Analysis and prediction of compressive and split-tensile strength of secondary steel fiber reinforced concrete based on RBF fuzzy neural network model

Ling,

Chengbin,

Yafeng

et al. 2024

PLoS ONE

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Accurate analysis of the strength of steel-fiber-reinforced concrete (SFRC) is important for ensuring construction quality and safety. Cube compression and splitting tensile tests of steel fiber with different varieties, lengths, and dosages were performed, and the effects of different varieties, lengths, and dosages on the compressive and splitting properties of secondary concrete were obtained. It was determined that the compression and splitting strengths of concrete could be effectively improved by the addition of end-hooked and milled steel fibers. The compressive and splitting strengths of concrete can be enhanced by increasing the fiber length and content. However, concrete also exhibits obvious uncertainty owing to the comprehensive influence of steel fiber variety, fiber length, and fiber content. In order to solve this engineering uncertainty, the traditional RBF neural network is improved by using central value and weight learning strategy especially. On this basis, the RBF fuzzy neural network prediction model of the strength of secondary steel fiber-reinforced concrete was innovatively established with the type, length and content of steel fiber as input information and the compressive strength and splitting tensile strength as output information. In order to further verify the engineering reliability of the prediction model, the compressive strength and splitting tensile strength of steel fiber reinforced concrete with rock anchor beams are predicted by the prediction model. The results show that the convergence rate of the prediction model is increased by 15%, and the error between the predicted value and the measured value is less than 10%, which is more efficient and accurate than the traditional one. Additionally, the improved model algorithm is efficient and reasonable, providing technical support for the safe construction of large-volume steel fiber concrete projects, such as rock anchor beams. The fuzzy random method can also be applied to similar engineering fields.

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Effect of fiber hybridization on mechanical properties of concrete

Cited by 20 publications

References 38 publications

Study of Low-Velocity Impact Behavior of Hybrid Fiber-Reinforced Metal Laminates

Study of Low-Velocity Impact Behavior of Hybrid Fiber-Reinforced Metal Laminates

Experimental study and numerical simulation of the effect of different fiber types on the basic mechanical properties of shotcrete

Analysis and prediction of compressive and split-tensile strength of secondary steel fiber reinforced concrete based on RBF fuzzy neural network model

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