Electrical characteristics of hierarchical conductive pathways in cementitious composites incorporating CNT and carbon fiber

Kim, G.M.; Park, Solmoi; Ryu, Gum-Sung

doi:10.1016/j.cemconcomp.2017.06.004

Cited by 89 publications

(31 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As shown in Table 7, as CNT additions increased in the mixtures, heat production inside the specimens increased, but the time to reach highest temperature for each specimen decreased. That is, CNT played an important role in enhancement of heat transfer capacity caused by electrical conductivity, low resistance, and high current migration [29]. The more CNT added in the mixtures, the higher the increase in temperature was observed.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Effects of CNT Dosages in Cement Composites on the Mechanical Properties and Hydration Reaction with Low Water-to-Binder Ratio

Jung

Kim

et al. 2019

Applied Sciences

View full text Add to dashboard Cite

This study aimed to investigate the potential use of carbon nanotubes (CNTs), which are an innovative construction material preferred by many researchers. Long-term microstructure enhancement and on-site application are major reasons to conduct research on CNT-cement composites; thus, a study on mechanical properties as well as the thermal conductivity of CNT-cement composites was carried out. As the CNT content increased, the thermal conductivity of CNT-cement composites was also enhanced. In addition, a couple of microstructure analyses such as isothermal calorimetry, thermal gravimetric analysis and SEM-EDS (Scanning Electron Microscope-Energy Dispersive X-ray Spectroscopy) for observing hydration reaction rate and types of hydration products were conducted to establish the advantage of CNT use in cement composites. Strength development of CNT-cement composites at early ages was slow, although eventually CNTs containing water developed equivalent level of strengths at last as internal curing effects.

show abstract

Section: Thermal Conductivitymentioning

confidence: 99%

Effects of CNT Dosages in Cement Composites on the Mechanical Properties and Hydration Reaction with Low Water-to-Binder Ratio

Jung

Kim

et al. 2019

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Several studies have evaluated the self-sensing abilities of Portland cement-based concretes and mortars containing conductive fillers such as carbon nanotubes, carbon nanofibers, graphite powders and steel microfibers [26][27][28][29]. Research, including previous work by the authors, has demonstrated the monitoring capabilities of cement-based materials doped with conductive fillers and their promising application in structural health-monitoring [25,[30][31][32][33][34][35], where issues related to the fillers' dispersion and to the electrical setup represented the main bottlenecks to solve [36,37]. Of the notable literature about smart cementitious materials, only a few studies focus on the use of conductive fillers on geopolymers [38,39] or alkali-activated slag cement-based mixtures [40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Self-Sensing Properties of Green Alkali-Activated Binders with Carbon-Based Nanoinclusions

et al. 2020

View full text Add to dashboard Cite

This paper is aimed at investigating the self-sensing properties of Portland-free alkali-activated binders doped with carbon-based nanofillers. Four different inclusions (carbon nanotubes, carbon nanofibers, carbon black and graphene nanoplatelets) were added into the matrix in the same amount. The physical and electromechanical properties were analyzed. The self-sensing capabilities of the samples were tested by applying a square wave voltage signal and measuring the variation of electrical resistance during cyclical compression tests. The results showed that the presence of nano-inclusions enhanced the sensing behavior of the materials, especially regarding the linearity and the hysteresis performances. Such results appear promising for the application of such novel and innovative nano-modified composites in the field of monitoring structures and infrastructures.

show abstract

“…CFs can be dispersed relatively easily, compared with nanoscale fillers because CFs are micrometers in diameter and millimeters in length. Since the dispersion of CFs can be improved simply by incorporating silica fume [20][21][22][23], the above-mentioned dispersion techniques may not be required. In previous studies, the percolation threshold of CF was reported to be approximately between 0.5% and 1.0% [11,21,22,[24][25][26][27], while those of carbon nanotubes and carbon black were reported to be approximately 1.0% [5,28,29] and 7.22-11.39% [30], respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In other words, CFs are more efficient in forming electric pathways in cement composites [31]. Several researchers showed that incorporating 0.1% CF into a cement composite with 0.5% CNT resulted in a stable electrical conductivity [23] and outstanding self-sensing performance [4]. In particular, Lee et al [4] reported the feasibility of replacing 0.5% CNT with 0.1% CF for improving the self-sensing performance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Carbon Fiber Incorporation on Electrical Conductivity of Cement Composites

You

Lee

et al. 2020

Applied Sciences

View full text Add to dashboard Cite

This study investigated the effects of carbon fiber (CF) length, electrode spacing, and probe configuration on the electrical conductivity of cement composites. Accordingly, 57 different types of samples were prepared, considering three different CF lengths, five different CF contents, three different electrode spacings, and two different probe configurations. This research found that the influence of CF length on the electrical resistivity of cement composite depends electrode spacing. For the cement composite with wide electrode spacing of 40 mm, its resistivity decreased as increasing CF length as in the previous study. However, when the electrode spacing is 10 mm, which is narrow (10 mm), the resistivity of the cement composite rather increased with increasing CF length. The results implied that when an electrode is designed for the cement composite incorporating CF, the CF length should be short compared to the electrode spacing. The percolation threshold of CF measured by the two-probe configuration was 2% or more. This is higher than that measured by the four-probe configuration (1%). At a lower CF content than 2%, the two-probe configuration gave higher resistivity of the cement composite than the four-probe configuration. However, the difference coming from the different probe configurations was marginal as increasing the CF content.

show abstract

Electrical characteristics of hierarchical conductive pathways in cementitious composites incorporating CNT and carbon fiber

Cited by 89 publications

References 45 publications

Effects of CNT Dosages in Cement Composites on the Mechanical Properties and Hydration Reaction with Low Water-to-Binder Ratio

Effects of CNT Dosages in Cement Composites on the Mechanical Properties and Hydration Reaction with Low Water-to-Binder Ratio

Self-Sensing Properties of Green Alkali-Activated Binders with Carbon-Based Nanoinclusions

Influence of Carbon Fiber Incorporation on Electrical Conductivity of Cement Composites

Contact Info

Product

Resources

About