Flexural Behavior of HPFRCC Members with Inhomogeneous Material Properties

Shin, Kyung-Joon; Jang, Kyu-Hyeon; Choi, Young-Cheol; Lee, Seong-Cheol

doi:10.3390/ma8041934

Cited by 14 publications

(3 citation statements)

References 23 publications

(30 reference statements)

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“…This section presents the sequential multi-cracking phenomena which is the main mechanism of the strain-hardening behavior of HPFRC under uniaxial tensile loading conditions. For a better understanding of the sequential multi-cracking phenomena, the sequential cracking behavioral model presented by Shin et al [21] has been employed. Figure 2 shows the sequential cracking mechanisms of HPFRC subjected to uniaxial tensile deformation.…”

Section: Strain-hardening Behavior Of Hpfrcmentioning

confidence: 99%

Probabilistic Analysis for Strain-Hardening Behavior of High-Performance Fiber-Reinforced Concrete

Choi

Lee

2019

Materials

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The practical application of fiber-reinforced concrete (FRC) in structural components has gained growing interest due to structural advantages such as improved tensile strength, distributed load transfer, crack width control, as well as superior durability. To this end, reliable structural assessment techniques and analytical models have been developed, placing emphasis on tension-softening behavior owing to the bond and pull-out mechanisms of fibers at a local crack. However, these models could not be directly applicable to evaluate the multiple cracking mechanisms of high-performance fiber-reinforced concrete (HPFRC), which exhibits strain-hardening behavior. To overcome this challenge, this paper presents a probabilistic analytical technique. This approach has employed the simplified diverse embedment model (SDEM). Then, an HPFRC member was modeled with multiple segments considering the most probable number of cracks. It was assumed that material properties had a normal probability distribution and were randomly assigned to each segment. To have reliable results, 10,000 analyses were performed for each analysis case and validated using experimental test data. Based on the analysis results, the actual strain-hardening tensile behavior of an HPFRC member could be reasonably predicted with the number of segments chosen on the basis of the fiber length.

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Section: Strain-hardening Behavior Of Hpfrcmentioning

confidence: 99%

Probabilistic Analysis for Strain-Hardening Behavior of High-Performance Fiber-Reinforced Concrete

Choi

Lee

2019

Materials

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“…In the literature, usually dogbone shaped specimens were subjected to direct tensile testing. However, it was found that the sizes of the samples subjected to the tensile test were quite different from each other when the studies were examined [11][12][13][14][15][16]. Therefore, the effect of sample cross-section dimensions on direct tensile strength is a subject that needs to be investigated.…”

Section: Research Significancementioning

confidence: 99%

Investigation of The Size Effect of Self-Compacting Concrete on Direct Tensile Strength

Güleç¹,

Avci²

2021

El-Cezeri Fen Ve Mühendislik Dergisi

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The correct determination of direct tensile strength is very important in reinforced concrete building design. Unless otherwise specified in the building codes, the tensile strength that should be used in building design is direct tensile strength. However, the direct tensile strengths stated in the codes are usually found by formulas based on compressive strength, flexural tensile strength or splitting tensile strength. The fact that direct tensile tests are difficult to apply and there are no clear principles in the building codes, as in indirect methods, have led to a limited number of studies on direct tensile strength. In previous studies on direct tensile tests, certain standards were not established regarding the sizes and shapes of the samples subjected to the test. In this study, the size effect of self-compacting concrete (SCC) on direct tensile strength was investigated. In this context, direct tensile strengths of dog-bone type SCC specimens of different thicknesses were compared. The experimental direct tensile strengths were compared with the experimental splitting and flexural tensile strength, and also their proximity to tensile strengths expressed in certain building codes such as TS500, Eurocode and ACI 318 were investigated. As a result of the study, it was revealed that there is an inverse proportion between the thickness of the specimen and the direct tensile strength, and depending on the increase in the specimen thickness, the experimental direct tensile strengths approached the tensile strengths specified in the building codes.

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“…In the case of average compressive and flexural strength of mortars, these properties are not statistically modified when adding RPFs.Reinforcing fibers can be incorporated to enhance the limited tension strength, fracture performance and early-age cracking, among other properties, of cement-based materials and the level of these improvements depends on different fiber factors (e.g., length, aspect ratio, roughness, strength, and Young's modulus) as well as matrix factors (e.g., aggregate size, strength and Young's modulus) [3]. Most of the industrialized reinforcing fibers, specifically designed to reinforce cement-based materials, are made of steel, polypropylene, and glass, and their successful impact improving the mechanical-damage performance of cement-based materials has been studied and it is well known [6][7][8][9][10][11][12][13]. However, the production of industrialized fibers has economic and environmental impacts.…”

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Mechanical-Damage Behavior of Mortars Reinforced with Recycled Polypropylene Fibers

et al. 2019

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Commercial polypropylene fibers are incorporated as reinforcement of cement-based materials to improve their mechanical and damage performances related to properties such as tensile and flexural strength, toughness, spalling and impact resistance, delay formation of cracks and reducing crack widths. Yet, the production of these polypropylene fibers generates economic costs and environmental impacts and, therefore, the use of alternative and more sustainable fibers has become more popular in the research materials community. This paper addresses the characterization of recycled polypropylene fibers (RPFs) obtained from discarded domestic plastic sweeps, whose morphological, physical and mechanical properties are provided in order to assess their implementation as fiber-reinforcement in cement-based mortars. An experimental program addressing the incorporation of RPFs on the mechanical-damage performance of mortars, including a sensitivity analysis on the volumes and lengths of fiber, is developed. Using analysis of variance, this paper shows that RPFs statistically enhance flexural toughness and impact strength for high dosages and long fiber lengths. On the contrary, the latter properties are not statistically modified by the incorporation of low dosages and short lengths of RPFs, but still in these cases the incorporation of RPFs in mortars have the positive environmental impact of waste encapsulation. In the case of average compressive and flexural strength of mortars, these properties are not statistically modified when adding RPFs.

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Flexural Behavior of HPFRCC Members with Inhomogeneous Material Properties

Cited by 14 publications

References 23 publications

Probabilistic Analysis for Strain-Hardening Behavior of High-Performance Fiber-Reinforced Concrete

Probabilistic Analysis for Strain-Hardening Behavior of High-Performance Fiber-Reinforced Concrete

Investigation of The Size Effect of Self-Compacting Concrete on Direct Tensile Strength

Mechanical-Damage Behavior of Mortars Reinforced with Recycled Polypropylene Fibers

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