Characterization of Fiber Connectivity in Fire-resistant High Strength Concrete using Percolation Theory

Shin, Young-Sub; Han, Tong Seok

doi:10.9798/kosham.2011.11.1.001

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…However, when the fber content exceeds the percolation threshold, tunneling conduction or feld emission conduction plays a leading role in composite conductivity in addition to direct contact of the fbers. In zone C, the fber content is much higher than the percolation threshold, and fbers can be approximately regarded as totally contacting each other [49,50].…”

Section: Percolation Tresholdmentioning

confidence: 99%

A Comparative Study on Electrical Resistivity and Compressive Strength Properties of Cement Composites Incorporating Conductive Materials

Park

Seo

Lim

et al. 2023

Advances in Materials Science and Engineering

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Conductive cement composites have attracted high attention in recent years due to the possibility of achieving multifunctional materials. The usual approach has been to incorporate steel fiber, carbon fiber, graphite, and carbon nanotube/or carbon nanofiber into the cement matrix. In this article, an experimental comparative study was conducted on the electrical resistivity and compressive strength properties of cement composites incorporating carbon fiber (CF) and steel fiber (SF), which are conductive materials. The electrical resistivity of the conductive fiber-reinforced cement composites (FRCCs) was measured using the four-probe method, and compressive strength was conducted based on the KS L ISO 679 and ASTMC109/C109M test methods. Their performance was compared and analyzed with plain cement composites (PCCs). Afterwards, the fracture surfaces of the conductive SFRCCs (steel fiber-reinforced cement composites) and CFRCCs (carbon fiber-reinforced cement composites) were also analyzed using a scanning electron microscope (SEM). The experimental results showed that, in all specimens, the electrical resistivity gradually increased as the curing ages elapsed, while the electrical resistivity decreased significantly as the fiber volume fractions increased. Overall, the addition of SF up to a fiber volume fraction of 1.25% did not significantly affect the electrical resistivity of cement composites. In contrast, however, the electrical resistivity of CF decreased slightly even at a low dosage (i.e., 0.1–0.3%), and thereafter, it was significantly decreased. The percolation threshold of the conductive CFRCC incorporating CF used in this experiment was 0.4%, and this seemed to be the optimal CF dosage that can greatly improve the conductive cement composites while maintaining the maximum performance of compressive strength. In addition, the compressive strength of conductive SFRCC was higher than that of PCC, whereas in the case of conductive CFRCC, it showed a greater tendency to decrease significantly as the fiber volume fractions increased. We expect the results of SEM image analysis to be useful as basic data for establishing microstructure mechanisms of reinforcement fibers in the cement matrix.

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Section: Percolation Tresholdmentioning

confidence: 99%

A Comparative Study on Electrical Resistivity and Compressive Strength Properties of Cement Composites Incorporating Conductive Materials

Park

Seo

Lim

et al. 2023

Advances in Materials Science and Engineering

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Research trends and design guidelines for fire resistance of structural concrete in South Korea

Choi

Kim

Jang

et al. 2017

Magazine of Concrete Research

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Research into the fire resistance of structural concrete in South Korea has been ongoing since 2000 and incorporates studies on concrete materials, columns, construction methods and finishing materials. Recently, experiments and analytical studies have been undertaken to include diverse materials and structures for fire resistance. Based on the results of these studies, the South Korean government recognised the need for performance criteria for legal fire-resistant construction and published Regulations for Egress/Fire Protection Construction in 2015. In light of this previous work, this paper provides a review of recent research results for the prevention of the explosive fracture of concrete exposed to high temperatures, analysis of the fire resistance of concrete and recent fire mitigation construction methods. In addition, the paper briefly describes existing specifications for fire resistance design methods in South Korea.

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Characterization of Fiber Connectivity in Fire-resistant High Strength Concrete using Percolation Theory

Cited by 2 publications

References 7 publications

A Comparative Study on Electrical Resistivity and Compressive Strength Properties of Cement Composites Incorporating Conductive Materials

A Comparative Study on Electrical Resistivity and Compressive Strength Properties of Cement Composites Incorporating Conductive Materials

Research trends and design guidelines for fire resistance of structural concrete in South Korea

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