Effects of High Temperature on the Burst Process of Carbon Fiber/PVA Fiber High-Strength Concretes

Cao, Rui-Dong; Yang, Huiwei; Lu, Guifang

doi:10.3390/ma12060973

Cited by 15 publications

(9 citation statements)

References 33 publications

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“…This may be attributed to the fiber bridging effect, or in other words, when concrete exposed to high temperature, the PVA fibers melts creating paths to escape water vapor, which was captured in pore structure of concrete, in order to give concrete room to breathe, to prevent explosions and, in turn, to increase its resistance (Osman et al, 2019). Cao et al (2019) also observed no spalling in samples with PVA exposed to elevated temperature. Figure 7 shows the load deflection relations for specimens including different PVA ratios and subjected to different overheating time durations at zero eccentricity.…”

Section: Load-deflection Curves For Studied Columnsmentioning

confidence: 96%

“…The inclusion of steel fibers, in the hybrid fiber samples reduced mass loss from the samples at 600 o C. He also noted that after exposure to temperatures beyond 150 o C (near the melting point of the fibers), the failure mode of samples with PVA fibres changed from rupture to pulling out resulting in the change of behaviour of samples from deflection hardening to deflection-softening behavior. In another investigation, Cao, et al (2019) compared the residual mechanical properties for high strength samples (> 85MPa), containing PVA or Carbon fibers or both after exposure to 800 o C for up to 260 minutes. They concluded that the inclusion of the PVA in the samples can enhance the flexural strength and splitting strength of the concrete, but has little influence on the axial compressive strength when exposed to elevated temperatures.…”

Section: Effect Of Elevated Temperatures On Specimens Including Pva Fmentioning

confidence: 99%

“…temperature exposure, were lower than that of C21, tested at room temperature by 19.5%, 30%, and 60%, respectively. Cao et al (2019) reported that PVA fibers will melt under elevated temperatures, and holes will be formed in the concrete, which can effectively release the concrete vapor pressure and suppress the incidence of concrete spalling or crumbling. Figure 8 shows the load-deflection relationships for column specimens tested at eccentricity ratio, e/t, of 0.50, with and without fibers in room temperature or in different durations of temperature exposure.…”

Section: Concentric Columns (Axially Loaded)mentioning

confidence: 99%

See 2 more Smart Citations

Effect of elevated temperature on axially and eccentrically loaded columns containing Polyvinyl Alcohol (PVA) fibers

Said

El‐Azim

Ali

et al. 2020

Engineering Structures

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Polyvinyl Alcohol (PVA) fiber was developed more than 80 years ago in Japan. They are heavily used in non-structural applications and in Engineered Cementitious Composites (ECC) mainly for beams and thin slabs sections. There are gaps in the research regarding their performance in other structural elements and at elevated temperatures. The aim of this work is to study the behavior of reinforced concrete columns containing PVA fibers after being subjected to elevated temperatures and then loaded either concentrically or eccentrically. A total of thirty-six reinforced concrete columns, having constant longitudinal reinforcement, were experimentally tested under different load eccentricity ratios (0.0, 0.50, and 1.0). Different ratios of PVA, 0.75%, 1.50%, 2.25% were included in the concrete mixes. The studied columns were exposed to elevated temperature before loading. It was observed that columns containing PVA fibers had higher ultimate loads, higher ultimate deflection, less crack widths, higher ultimate deflection, higher energy absorption, and higher temperature resistance compared to normal reinforced concrete columns. In addition, these columns didn't show any sign of spalling due to the fiber bridging effect of PVA fibers unlike other studied normal reinforced concrete columns without fibers. It was found that addition of 1.50% fiber content showed better performance for centrically loaded columns while this was raised to be 2.25% for eccentrically loaded columns. The ultimate load of the columns exposed to elevated temperature rapidly decreased with increasing the duration of temperature to different magnitudes depending on the percentage inclusion of PVA fibers. It was found that ductility and energy absorption for columns including 1.5% PVA were higher than their companions without fibers after temperature exposure. It was observed that the energy absorption of eccentric columns exposed to temperature for up to two hours was still higher than that of their companions without fibers by 40% for eccentricity ratio of 1.0.

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Section: Load-deflection Curves For Studied Columnsmentioning

confidence: 96%

Section: Effect Of Elevated Temperatures On Specimens Including Pva Fmentioning

confidence: 99%

Section: Concentric Columns (Axially Loaded)mentioning

confidence: 99%

See 1 more Smart Citation

Effect of elevated temperature on axially and eccentrically loaded columns containing Polyvinyl Alcohol (PVA) fibers

Said

El‐Azim

Ali

et al. 2020

Engineering Structures

View full text Add to dashboard Cite

show abstract

“…The melting point of PVA fiber is reported to be between 220 and 230 °C [ 216 , 217 , 218 ]. Heo et al [ 107 ] utilized PP, PVA, and nylon fibers with different lengths and volume fractions in concrete to evaluate their efficiency when exposed to elevated temperatures.…”

Section: Extreme Temperature Resistancementioning

confidence: 99%

State-of-the-Art Review of Capabilities and Limitations of Polymer and Glass Fibers Used for Fiber-Reinforced Concrete

et al. 2021

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The concrete industry has long been adding discrete fibers to cementitious materials to compensate for their (relatively) low tensile strengths and control possible cracks. Extensive past studies have identified effective strategies to mix and utilize the discrete fibers, but as the fiber material properties advance, so do the properties of the cementitious composites made with them. Thus, it is critical to have a state-of-the-art understanding of not only the effects of individual fiber types on various properties of concrete, but also how those properties are influenced by changing the fiber type. For this purpose, the current study provides a detailed review of the relevant literature pertaining to different fiber types considered for fiber-reinforced concrete (FRC) applications with a focus on their capabilities, limitations, common uses, and most recent advances. To achieve this goal, the main fiber properties that are influential on the characteristics of cementitious composites in the fresh and hardened states are first investigated. The study is then extended to the stability of the identified fibers in alkaline environments and how they bond with cementitious matrices. The effects of fiber type on the workability, pre- and post-peak mechanical properties, shrinkage, and extreme temperature resistance of the FRC are explored as well. In offering holistic comparisons, the outcome of this study provides a comprehensive guide to properly choose and utilize the benefits of fibers in concrete, facilitating an informed design of various FRC products.

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“…e existing literature shows that the application of PVA fiber in concrete has great potential and value. So far, the related research studies of PVA fiber concrete are mainly focused on the basic mechanical properties [7][8][9][10][11], bending behavior [12][13][14], impact properties [11,15], mechanical properties under the freeze-thaw cycle [16][17][18], and high-temperature properties [19][20][21][22][23], while the damped energy dissipation characteristics concerned by engineering seismic research are less studied [24].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effect of Rubber Powder on Mechanical Properties of PVA Fiber Concrete

Wang

Zeng

et al. 2021

Advances in Civil Engineering

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To verify the damping improvement by replacing partial sand with rubber powder in the concrete process, this study investigated the effects of the rubber powder (5%, 10%, 15%, and 20%) on the mechanical properties and micromechanism of polyvinyl alcohol (PVA) fiber-reinforced concrete. In addition, in order to discuss its damping performance, free vibration test was conducted. Microstructure analyses were conducted by the scanning electron microscope (SEM) test. These results indicated that, as the content of the rubber powder increased, the damping ratio increased, and the compressive strength decreased, but this strength loss can be effectively controlled by adding PVA fiber. The rubber powder with a volume content of 5% and PVA with a mass of 2.4 kg/m3 were the most optimal mixing to balance the strength and damping requirement. According to the SEM test results, the rubber powder was beneficial to improve the damping ratio of PVA concrete, but it aggravated its interface defects.

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Effects of High Temperature on the Burst Process of Carbon Fiber/PVA Fiber High-Strength Concretes

Cited by 15 publications

References 33 publications

Effect of elevated temperature on axially and eccentrically loaded columns containing Polyvinyl Alcohol (PVA) fibers

Effect of elevated temperature on axially and eccentrically loaded columns containing Polyvinyl Alcohol (PVA) fibers

State-of-the-Art Review of Capabilities and Limitations of Polymer and Glass Fibers Used for Fiber-Reinforced Concrete

Experimental Investigation on the Effect of Rubber Powder on Mechanical Properties of PVA Fiber Concrete

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