Effect of PVA fiber on mechanical properties of cementitious composite with and without nano-SiO2

Ling, Yifeng; Zhang, Peng; Wang, Juan; Chen, Yuanzhao

doi:10.1016/j.conbuildmat.2019.117068

Cited by 75 publications

(27 citation statements)

References 44 publications

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“…The high free energy of nanoparticles not only accelerated cement hydration but also helped nanoparticles to behave as kernels in the cement paste, which reduced the Ca(OH) 2 crystal size and made the tropism more stochastic. 39 The high free energy of nanoparticles reduced the Ca(OH) 2 crystal size and content ( Figure 5((b) -d2)). The high packing capacity of the mixture with nanoparticles indicated the rapid development of the C-S-H gel in the presence of different nanoparticles and a decrease in the Ca(OH) 2 crystal size due to the consumption of crystalline Ca(OH) 2 .…”

Section: Compressive Strengthmentioning

confidence: 99%

A DOE approach to optimize the strength properties of concrete incorporated with different ratios of PVA fibre and nano-Fe₂O₃

Cibilakshmi¹,

Jegan²

2020

Advanced Composites Letters

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The purpose of this research is to optimize the fresh and strength properties of concrete with various incorporation ratios of polyvinyl alcohol (PVA) fibre and nano-Fe2O3 by design of experiment approach. Central composite design of response surface methodology was used to acquire the optimal composition of process variables, and the influence of process variable on the fresh and strength properties of concrete was also verified. A total of five responses ( Y Slump, f ck,7, f ck,28, f t,7 and f t,28) were considered in this study, and the factors and the level of each response was 2 and 3, respectively. Regression models for Y Slump, f ck,7, f ck,28, f t,7 and f t,28 were tested; the statistical significance of each process variable was assessed through analysis of variance and Pareto chart, and the obtained models were expressed in the form of second-order polynomial equation. The test results revealed that incorporation of PVA and high-reactive nano-Fe2O3 improved the strength of the concrete; however, the higher level incorporation exhibited unpronounced effect on the strength enhancement. The incorporation of nano-Fe2O3 enhanced the compressive strength to the maximum of 7.44%. The high-reactive nano-Fe2O3 accelerated the hydration process of concrete and enhanced the particle packing density of the concrete by filling the micropores. However, the higher incorporation of nano-Fe2O3 leached out the surplus silica from the concrete and reduced the strength enhancement of the cement composite matrix. The regression analysis results revealed that the most significant and contribution factor for f ck,7 and f ck,28 is the linear term nano-Fe2O3 ( X 2), 99.81% contribution, and for f t,7 and f t,28 is the linear term PVA ( X 1), 75.75% contribution. Pareto chart and surface plot analysis also revealed the same as above. The optimal proportion of design variables against f ck,7, f ck,28, f t,7 and f t,28 were obtained and the percentage of error of the confirmation tests for Y Slump, f ck,7, f ck,28, f t,7 and f t,28 were less than 3%.

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Section: Compressive Strengthmentioning

confidence: 99%

A DOE approach to optimize the strength properties of concrete incorporated with different ratios of PVA fibre and nano-Fe₂O₃

Cibilakshmi¹,

Jegan²

2020

Advanced Composites Letters

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“…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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“…This is because the hydrophilic PVA fiber consumes more water in the mixing stage. In addition, as the proportion of fiber increases, more cement paste is consumed to cover the fibers, leading to a smaller amount of paste for the slump flow [30]. Figure 4a,b shows the compressive strengths of the samples.…”

Section: Flow Tablementioning

confidence: 99%

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

Long

Tang

et al. 2019

Materials

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Coral aggregate has been widely used for island construction because of its local availability. However, the addition of coral aggregate exaggerates the brittle nature of cement-based materials under dynamic loading. In this study, polyvinyl alcohol (PVA) fiber was used to improve dynamic mechanical behavior of seawater coral mortars (SCMs). The effects of coral aggregate and PVA fiber on the workability, static mechanical strengths, and dynamic mechanical behavior of fiber-reinforced SCMs were investigated. Results showed that the workability of the SCM decreased with increasing coral aggregate replacement rate and PVA fiber content. Mechanical strengths of the SCM increased with increasing PVA fiber content, but decreased with increasing coral aggregate replacement rate. Dynamic mechanical behavior at varying coral aggregate replacement rates was analyzed by combining dynamic mechanical analysis and micro-scale elastic modulus experiment. With increasing coral aggregate replacement rate, the storage modulus, loss factor, and elastic modulus of the interfacial transition zone in the SCM decreased. Nevertheless, with the incorporation of PVA fibers (1 vol.%), the storage modulus and loss factor were improved dramatically by 151.9 and 73.3%, respectively, compared with the reference group. Therefore, fiber-reinforced coral mortars have a great potential for use in island construction, owing to the excellent anti-vibrational performance.

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Effect of PVA fiber on mechanical properties of cementitious composite with and without nano-SiO2

Cited by 75 publications

References 44 publications

A DOE approach to optimize the strength properties of concrete incorporated with different ratios of PVA fibre and nano-Fe₂O₃

A DOE approach to optimize the strength properties of concrete incorporated with different ratios of PVA fibre and nano-Fe₂O₃

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

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

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Effect of PVA fiber on mechanical properties of cementitious composite with and without nano-SiO2

Cited by 75 publications

References 44 publications

A DOE approach to optimize the strength properties of concrete incorporated with different ratios of PVA fibre and nano-Fe2O3

A DOE approach to optimize the strength properties of concrete incorporated with different ratios of PVA fibre and nano-Fe2O3

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

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

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Product

Resources

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A DOE approach to optimize the strength properties of concrete incorporated with different ratios of PVA fibre and nano-Fe₂O₃

A DOE approach to optimize the strength properties of concrete incorporated with different ratios of PVA fibre and nano-Fe₂O₃