Effect of amorphous metallic fiber on mechanical properties of high-strength concrete exposed to high-temperature

Choe, Gyeongcheol; Kim, Gyu-Yong; Kim, Hongseop; Hwang, Euichul; Lee, Sangkyu; Nam, Jeongsoo

doi:10.1016/j.conbuildmat.2019.05.134

Cited by 19 publications

(7 citation statements)

References 27 publications

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“…It is thought that this increase may be due to the hydrothermal interaction of the free lime released during the hydration reaction and the silica contained in the pumice as a result of the temperature increase. It has been determined that these values are compatible with the studies (Saad et al 2020;Choe et al 2019;Alfahdawi et al 2019;Eidan et al 2019).…”

Section: Figure 7 the Effect Of High Temperature On Compressive Strengthsupporting

confidence: 74%

The Properties of Glass Fiber Reinforced Lightweight Concrete under the Effect of High Temperature

2022

CER

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This study aimed to produce lightweight concrete by using 50% pumice as coarse aggregate and 0.1% and 0.3% glass fiber. It is aimed to investigate the changes that will occur in the compressive strength and splitting tensile strength properties of the samples when this lightweight concrete produced is exposed to temperatures of 150 °C, 300 °C, 450 °C and 600 °C. The study was carried out in six stages. In the first stage, reference samples were produced. In the second stage, 0.1% and 0.3% glass fiber reinforced lightweight concrete samples were produced. In the third stage, unit weight, porosity, compressive strength and splitting tensile strength tests were applied to the produced samples. In the fourth step, the samples were gradually exposed to different temperatures (150 °C, 300 °C, 450 °C and 600 °C). In the fifth stage, compressive strength and splitting tensile strength tests were applied to the samples exposed to high temperature. In the sixth and final stage, SEM images of 0.1% glass fiber reinforced lightweight concrete samples were analysed. As a result, it was observed that the unit weight value decreased and the porosity values increased with glass fiber reinforcement. There was also an increase in compressive and splitting tensile strengths. In addition, it was observed that the samples exposed to 150 oC temperature had the highest compressive strength and splitting tensile strength. In the analysis of SEM images, with the increase in temperature, it was determined that the samples in microstructure changed into macrostructure as well as the cracks occurred in the sample structure. The importance of this study stem from increasing tensile strength of lightweight concrete with glass fiber reinforcement so as to prevent loss of life and property in an earthquake.This study is important because it increases the tensile strength of lightweight concrete with low tensile strength with glass fiber reinforcement. This will result in less loss of life and property in an earthquake.

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Section: Figure 7 the Effect Of High Temperature On Compressive Strengthsupporting

confidence: 74%

The Properties of Glass Fiber Reinforced Lightweight Concrete under the Effect of High Temperature

2022

CER

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“…Table 3 shows the experimental plan. In previous studies, fire-resistance performance was evaluated to utilize amorphous metallic fiber-reinforced concrete as a multifunctional material, and this property was linked with the specimen levels tested in this study [27,28]. The specimens had six levels, and 0.15 vol.% of polypropylene fibers was added.…”

Section: Experimental Plan and Mixture Proportionsmentioning

confidence: 99%

“…In addition, amorphous metallic fibers can reduce carbon dioxide emissions by around 20% as the process used to produce them is simplified compared with typical steel fibers [23]. Previous studies related to amorphous metallic fiber-reinforced concrete, however, were mostly focused on mechanical properties and durability [23][24][25][26][27][28][29][30]. Furthermore, there are few studies related to special physical impacts, such as electromagnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Wave Shielding Properties of Amorphous Metallic Fiber-Reinforced High-Strength Concrete Using Waveguides

Lee

Kim

et al. 2021

Materials

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In this study, high-strength concrete containing hooked-end steel or amorphous metallic fibers was fabricated, and the electrical conductivity and electromagnetic shielding effectiveness were evaluated after 28 and 208 days based on considerations of the influences of the moisture content. Amorphous metallic fibers, which have the same length and length/equivalent diameter ratio as hooked-end steel fibers, were favored for the formation of a conductive network because they can be added in large quantities owing to their low densities. These fibers have a large specific surface area as thin plates. The electromagnetic shielding effectiveness clearly improved as the electrical conductivity increased, and it can be expected that the shielding effectiveness will approach the saturation level when the fiber volume fraction of amorphous metallic fibers exceeds 0.5 vol.%. Meanwhile, it is necessary to reduce the amount of moisture to conservatively evaluate the electromagnetic shielding performance. In particular, when 0.5 vol.% of amorphous metallic fibers was added, a shielding effectiveness of >80 dB (based on a thickness of 300 mm) was achieved at a low moisture content after 208 days. Similar to the electrical conductivity, excellent shielding effectiveness can be expected from amorphous metallic fibers at low contents compared to that provided by hooked-end steel fibers.

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“…Regardless of numerous benefits, concrete has some weaknesses including low energy-absorption capacity and low tensile resistance resulting in spalling, cracking, and lower lifespan of the structures [76,77]. Recently, using macro fibers as concrete reinforcement has become prevalent to present a solution for enhancing the mechanical properties of the OPC concrete [5,[78][79][80]. The use of fiber in concrete matrix has less or no impact on concrete pre-cracking behavior.…”

Section: Fiber-reinforced Concrete (Frc)mentioning

confidence: 99%

Natural Kenaf Fiber and LC3 Binder for Sustainable Fiber-Reinforced Cementitious Composite: A Review

Baghban

Mahjoub

2020

Applied Sciences

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Low impact on the environment and low cost are the key drivers for today’s technology uptake. There are many concerns for cement production in terms of negative environmental impact due to greenhouse gas (GHG) emission, deficiency of raw materials, as well as high energy consumption. Replacement of the cement by appropriate additives known as supplementary cementitious materials (SCMs) could result in reduction in GHG emission. Limestone-calcined clay cement (LC3) is a promising binder in the concrete sector for its improvements to environmental impact, durability, and mechanical properties. On the other hand, the advantages of fiber-reinforced concrete such as improved ductility, versatility, and durability have resulted in increasing demand for this type of concrete and introduction of new standards for considering the mechanical properties of fibers in structural design. Thus, using natural fibers instead of synthetic fibers can be another step toward the sustainability of the concrete industry, which is facing increasing demand for cement-based materials. This review studies the potential of natural Kenaf fiber-reinforced concrete containing LC3 binder as a step toward green cementitious composite. While studies show that energy consumption and GHG emission can be reduced and there is a significant potential to enhance mechanical and durability properties of concrete using this composition, adjustment of the mix design, assessing the long-term performance and standardization, are the next steps for the use of the material in practice.

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Effect of amorphous metallic fiber on mechanical properties of high-strength concrete exposed to high-temperature

Cited by 19 publications

References 27 publications

The Properties of Glass Fiber Reinforced Lightweight Concrete under the Effect of High Temperature

The Properties of Glass Fiber Reinforced Lightweight Concrete under the Effect of High Temperature

Electromagnetic Wave Shielding Properties of Amorphous Metallic Fiber-Reinforced High-Strength Concrete Using Waveguides

Natural Kenaf Fiber and LC3 Binder for Sustainable Fiber-Reinforced Cementitious Composite: A Review

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