The role of electronic and ionic conduction in the electrical conductivity of carbon fiber reinforced cement

Wen, Sihai; Chung, D.D.L.

doi:10.1016/j.carbon.2006.03.013

Cited by 147 publications

(70 citation statements)

References 29 publications

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“…However, the reinforcement of the cement matrix at the microscale with the CMF has contributed to compensate for the negative effect of the aggregates and has favored the flow of current through cement paste, probably with a mixed mechanism for electrical conduction. The water-filled pores are relevant for electrical conduction in the cement paste as tested in [19,22] and the mix of CNT and CMF will favorand contribute to conduction by contacting and tunnelling as predicted in [29][30][31]. In this work, the lack of liquid in the pores at 105 • C has caused a significant increase in electrical resistivity, shown in Figure 7.…”

Section: The Self-diagnosis Sensitivity Of Scc Reinforced With the Hymentioning

confidence: 62%

“…Electrical conduction in a cementitious material takes place, first, through the liquid water in the pores, that is, the mobility of ions in the pore solution. This type of conductivity is identified as the ionic conductivity [29] of a cementitious material and is significantly affected by the moisture content in pores [19]. Well-distributedself-sensing additives in the cement paste matrix improves the conductive electrical network of the cementitious material.…”

Section: Introductionmentioning

confidence: 99%

“…However, the electrical conduction mechanism of self-sensing cementitious materials is complex and not well understood. The most plausible governing conduction mechanism is identified as beingelectronic (due to the direct contact between the functional additives) and helped by a tunnelling mechanism (conduction occurring between close functional additives which are not in contact) [16,[29][30][31]. Nevertheless, the combined contribution of all the conduction systems: Ionic+contacting+tunnelling for electrical conductivity enhancement of cementitious materials with self-sensing additives is the most probable.…”

Section: Introductionmentioning

confidence: 99%

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Self-Compacted Concrete with Self-Protection and Self-Sensing Functionality for Energy Infrastructures

Alonso

Puentes

2020

Materials

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This paper aims to demonstrate the self-protection and self-sensing functionalities of self-compacted concrete (SCC) containing carbon nanotubes (CNT) and carbon microfibers (CMF) in a hybrid system. The ability for self-sensing at room temperature and that of self-protection after thermal fatigue cycles is evaluated. A binder containing a high volume of supplementary mineral additions (30%BFSand20%FA) and different type of aggregates (basalt, limestone, and clinker) are used. The self-diagnosis is assessed measuring electrical resistivity (ER) and piezoresistivity (PZR) in compression mode within the elastic region of the concrete. Thermal fatigue is evaluated with mechanical and crack measurements after heat cycles (290–550 °C). SCC withstands high temperature cycles. The protective effect of the hybrid additive (CNT+CMF) notably diminishes damage by keepinghigher residual strength and lessmicrocracking of the concrete. Significant reductions in ER are detected. The self-diagnosis ability of functionalized SCC isconfirmed with PZR. A content of the hybrid functional additive (CNT+CMF) in the percolation region is recommended to maximize the self-sensing sensitivity. Other parameters as sample geometry, sensor location, power supply, and load level have less influence.

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Section: The Self-diagnosis Sensitivity Of Scc Reinforced With the Hymentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self-Compacted Concrete with Self-Protection and Self-Sensing Functionality for Energy Infrastructures

Alonso

Puentes

2020

Materials

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“…Thus, the strong interaction between TiO 2 and the porous matrix in the composites is a prerequisite for enhanced reactivity [19,22]. It is known that the small fibers of the CF exhibit better electronic conductivity than glass fibers [23,24]. The good electronic conductivity of the carbon fibers, as well as the intimate contact between TiO 2 and the carbon fibers, facilitates rapid migration of the photoexcited electrons from the conduction band of TiO 2 to the CF support, which reduces the rate of recombination between electrons and holes and leaves more holes to participate in the oxidization of dye molecules.…”

Section: Congo Red Oxidationmentioning

confidence: 99%

Photoactivity of titanium dioxide/carbon felt composites prepared with the assistance of supercritical carbon dioxide: Effects of calcination temperature and supercritical conditions

Chen

et al. 2011

Sci. China Chem.

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TiO 2 -coated carbon felt (TCF) composite catalysts have been prepared via a supercritical treatment of titanium tetraisopropoxide (TTIP) as the precursor. The physical properties of the catalysts were characterized by means of thermogravimetric and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), fluorescence spectroscopy, scanning electron microscopy (SEM), and BET surface areas techniques. The photocatalytic activities of the materials were evaluated using the degradation of Congo red (CR) as a probe reaction. All the composites showed much higher photocatalytic activity than commercial P25 due to significant synergistic effects. Reused TCF retained high photocatalytic activity for degradation of CR. The photocatalytic efficiency in CR degradation was found to be strongly dependent on the TiO 2 -coating ratio and calcination temperature. A possible mechanism for the enhanced reactivity involves shuttling of electrons from TiO 2 particles to the carbon felt (CF) as a result of an optimal arrangement in TCF that stabilizes charge separation and reduces charge recombination. In addition to the significant synergistic effects, the abundant spaces between adjacent carbon fibers allow UV light to penetrate into the felt-like photocatalyst to a considerable depth, so that a three-dimensional environment is available for the photocatalytic reaction. titanium dioxide, carbon felt, supercritical, calcination, photocatalysis

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“…This is mainly because of their superior mechanical properties (high specific strength modulus, and low expansion coefficient), low density, good environmental compatibility, longterm durability and high resistance to chemical corrosion [2,[6][7][8][9]. However, in high current pulsed discharge, the behavior of carbon fibers as electrically exploded conductor is not understood.…”

Section: Introductionmentioning

confidence: 97%

Surface modification and submicron structure of carbon fibers through high current pulse

Li¹,

Liu²,

Wan³

et al. 2009

Applied Surface Science

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The role of electronic and ionic conduction in the electrical conductivity of carbon fiber reinforced cement

Cited by 147 publications

References 29 publications

Self-Compacted Concrete with Self-Protection and Self-Sensing Functionality for Energy Infrastructures

Self-Compacted Concrete with Self-Protection and Self-Sensing Functionality for Energy Infrastructures

Photoactivity of titanium dioxide/carbon felt composites prepared with the assistance of supercritical carbon dioxide: Effects of calcination temperature and supercritical conditions

Surface modification and submicron structure of carbon fibers through high current pulse

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