AC-impedance response of multi-walled carbon nanotube/cement composites

Wansom, S.; Kidner, Neil J.; Woo, Leta; Mason, Thomas O.

doi:10.1016/j.cemconcomp.2006.01.014

Cited by 154 publications

(66 citation statements)

References 18 publications

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“…Finally, it should be noted that these results exceed those found in the reference section because, although we have already described the use of sonication technique for CNTs dispersion (Wansom, Kidner, Woo, & Mason, 2006), we have only obtained slight increases in the values of compressive strength tests and nanoindentation (Campillo, Dolado, & Porro, 2004) (Makar & Beaudoin, 2003). Nevertheless, there are publications that show similar increases, but always using dispersants and deaerators (Li Wang et al, 2005) (Sobolkina et al, 2012) (Williams, 2008).…”

Section: Mechanical Characterization Of Cement Mortars Test Tubes Witcontrasting

confidence: 47%

Comparative study on high-strength structural elements and CNT additions

Fraga¹,

Campo

García

et al. 2016

Revista de la Construcción

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Carbon Nanotubes (CNT) show extraordinary properties such as high strength and stiffness, the highest among known materials. This is what makes them potential candidates for concrete reinforcement. This paper explores the applicability of CNT in cementitious matrices comparing results derived from high-strength concrete and conventional concrete, as well as conventional concrete. For the execution of this research, and in order to analyze cement mortars with additions when compared to high-strength concrete, different types of CNT have been depicted and selected. After the characterization of different cement pastes obtained, structural elements have been measured. This analysis leads us to the conclusion that the most suitable mechanical strengthening agent for laboratory scale small samples is the use of CNT, since we do not detect significant differences between the structural elements dimensions and high-strength concrete regarding pastes with CNT.Keywords: nanotubes, carbon, concrete strength, additions, structures. ResumenLos nanotubos de carbono (CNT) poseen propiedades extraordinarias como su elevada resistencia y rigidez, las más elevadas de los materiales conocidos. Estas les hacen candidatos potenciales como material de refuerzo de hormigón. Este trabajo profundiza en la aplicabilidad de los CNT en matrices cementantes comparando los resultados con hormigones de alta resistencia, así como con hormigones convencionales. Para la realización de este trabajo, se han seleccionado y caracterizado diferentes tipos de CNT con el fin de estudiar morteros de cemento con adiciones comparándolos con hormigones de alta resistencia. Tras la caracterización de las diferentes pastas de cemento obtenidas, se han dimensionado elementos estructurales. Con estos estudios se concluye que, sólo se considera apropiada la utilización de los CNT como agentes de refuerzo mecánico, para muestras pequeñas a escala de laboratorio, ya que no se aprecian diferencias notables entre las dimensiones de los elementos estructurales con hormigones de alta resistencia respecto a los hormigones con CNT.Palabras clave: nanotubos, carbono, resistencia del hormigón, adiciones, estructuras.

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Section: Mechanical Characterization Of Cement Mortars Test Tubes Witcontrasting

confidence: 47%

Comparative study on high-strength structural elements and CNT additions

Fraga¹,

Campo

García

et al. 2016

Revista de la Construcción

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“…Their dispersion into a cementitious matrix enhances the electrical properties of the original materials, providing them with self-sensing capabilities [16][17][18]. The self-monitoring ability is achieved through the correlation of strains or stresses of the material to electrical features, such as electrical resistance or impedance [19][20][21][22]. Different electrical effects contribute to the strain-sensing mechanism: the piezoresistivity of the conductive nanofillers, the contact resistance of the electrodes, the intrinsic resistance of the different materials, and the tunneling and the field emission effects due to the nanosize of the fillers [16,23].…”

Section: Introductionmentioning

confidence: 99%

Static and Dynamic Strain Monitoring of Reinforced Concrete Components through Embedded Carbon Nanotube Cement-Based Sensors

D’Alessandro

Ubertini

García‐Macías

et al. 2017

Shock and Vibration

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The paper presents a study on the use of cement-based sensors doped with carbon nanotubes as embedded smart sensors for static and dynamic strain monitoring of reinforced concrete (RC) elements. Such novel sensors can be used for the monitoring of civil infrastructures. Because they are fabricated from a structural material and are easy to utilize, these sensors can be integrated into structural elements for monitoring of different types of constructions during their service life. Despite the scientific attention that such sensors have received in recent years, further research is needed to understand (i) the repeatability and accuracy of sensors' behavior over a meaningful number of sensors, (ii) testing configurations and calibration methods, and (iii) the sensors' ability to provide static and dynamic strain measurements when actually embedded in RC elements. To address these research needs, this paper presents a preliminary characterization of the self-sensing capabilities and the dynamic properties of a meaningful number of cement-based sensors and studies their application as embedded sensors in a full-scale RC beam. Results from electrical and electromechanical tests conducted on small and full-scale specimens using different electrical measurement methods confirm that smart cement-based sensors show promise for both static and vibration-based structural health monitoring applications of concrete elements but that calibration of each sensor seems to be necessary.

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“…Few attempts have been made to add CNTs in cementitious matrices at an amount ranging from 0.5 to 2.0% by weight of cement. Previous studies have focused on the dispersion of CNTs in liquids by pre-treatment of the nanotube's surface via chemical modification [2][3][4][5][6][7][8]. Preliminary research has shown that small amounts of CNTs can be effectively dispersed in cementitious matrix [13].…”

Section: Introductionmentioning

confidence: 99%

“…However, cement matrix exhibits flaws which are at the nanoscale. The development of new nanosized fibers, such as carbon nanotubes (CNTs), has opened a new field for nanosized reinforcement within concrete [2][3][4][5][6][7][8]. The remarkable mechanical properties of CNTs [9][10] suggest that are ideal candidates for high performance cementitious composites.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Modification of Cementitious Materials

Shah

Konsta-Gdoutos

Metaxa

et al. 2009

Nanotechnology in Construction 3

102

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Abstract. This research investigates changes in the nanostructure and the nanoscale local mechanical properties of cement paste with micro-and nano-modifiers. Silica fume and multiwall carbon nanotubes (MWCNTs) were used as micro-and nano-modifiers. An effective method of dispersing CNTs in cement matrix was developed. A detailed study on the effects of CNTs concentration and aspect ratio on the fracture properties, nanoscale properties and microstructure of nanocomposite materials, was conducted. Significant improvements on the macro and nanomechanical properties of cement paste were observed with the incorporation of CNTs. Results suggest that CNTs can strongly modify and reinforce the cement paste matrix at the nanoscale.

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AC-impedance response of multi-walled carbon nanotube/cement composites

Cited by 154 publications

References 18 publications

Comparative study on high-strength structural elements and CNT additions

Comparative study on high-strength structural elements and CNT additions

Static and Dynamic Strain Monitoring of Reinforced Concrete Components through Embedded Carbon Nanotube Cement-Based Sensors

Nanoscale Modification of Cementitious Materials

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