Dispersion of carbon nanotubes and its influence on the mechanical properties of the cement matrix

Sobolkina, Anastasia; Mechtcherine, Viktor; Khavrus, Vyacheslav O.; Maier, Diana; Mende, Mandy; Ritschel, M.; Leonhardt, A.

doi:10.1016/j.cemconcomp.2012.07.008

Cited by 406 publications

(173 citation statements)

References 34 publications

Supporting

Mentioning

161

Contrasting

Unclassified

Order By: Relevance

“…The flexural strength's results of the batches incorporating CNTs were relatively high. This was also seen in some previous literature studies [8,9,22]. In general, the strength results indicated that CNTs with low diameters and high aspect ratios achieved the highest flexural strengths regardless of the CNTs' content.…”

supporting

confidence: 72%

“…CNTs have extraordinary properties such as high strength and thermal and electrical conductivity [1][2][3][4]. These properties raised the interest of many concrete and cementitious composites researchers to incorporate the nanofilaments into cement pastes and mortars to develop their properties [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. However, up to date, it was certainly shown that findings reported in the literature were contradictory.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Nanotube Geometry on the Strength and Dispersion of CNT-Cement Composites

Mohsen

Taha

Taqa

et al. 2017

Journal of Nanomaterials

View full text Add to dashboard Cite

This study investigated the effect of multiwalled carbon nanotubes' geometry on the dispersion and strength of cement composites. Mixes with CNTs contents ranging from 0.03 to 0.25% were prepared and tested using CNTs' diameters of 10-20, 20-30, and 30-50 nm and lengths of 0.5-2 and 10-30 m. The samples' microstructures were then examined using a scanning electron microscope. After that, Response Surface Methodologies techniques were implemented to determine the strength functions' response to the aspect ratio and weight fraction variables. The results showed that CNTs of smaller diameters and longer lengths resulted in the highest strength values in batches having CNT contents of up to 0.15%. At 0.25% CNTs, the results showed that those CNTs of shorter lengths attained higher strengths than those of longer ones. SEM images showed better dispersion properties at lower CNTs' contents regardless of their geometry. The analysis also indicated that short CNTs of 0.5-2 m length have better dispersion properties compared to long ones of 10-30 m length. The RSM model confirmed this finding. Furthermore, the model showed that the CNTs with the lowest aspect ratio of 83 and highest weight fraction of 0.25% provided the highest strength response among all batches.

show abstract

supporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Effect of Nanotube Geometry on the Strength and Dispersion of CNT-Cement Composites

Mohsen

Taha

Taqa

et al. 2017

Journal of Nanomaterials

View full text Add to dashboard Cite

show abstract

“…As reported in previous studies, it is described that although surface treatment of CNTs via chemical modifications to create the carboxyl surface increases the mechanical strength, some studies have proved anegative impact on the strength properties [26]. This is mainly due to the chemicals used for functionalization, which degrade the mechanical properties of CNTs.…”

Section: Introductionmentioning

confidence: 91%

Hydration Phenomena of Functionalized Carbon Nanotubes (CNT)/Cement Composites

Balasubramaniam

Mondal

Ramasamy

et al. 2017

Fibers

View full text Add to dashboard Cite

Abstract:The exciting features of carbon nanotubes (CNTs), such as high elastic modulus, high thermal and electrical conductivities, robustness, and nanoscopic surface properties make them attractive candidates for the cement industry. They have the potential to significantly enhanceengineering properties. CNTs play an important and critical role as nano-anchors in concrete, which enhance the strength by bridging pores in the composite matrix, thereby ensuring robust mechanical strength. The diameter, dispersion, aspect ratio, and interfacial surface interaction of CNTs affect the physical and mechanical properties of concrete, if due care is not taken. In this paper, the usable amount of CNT is scaled down considerably from 0.5% to 0.025% by weight of the cement and the fluctuation caused by these phenomena is assessed. It is observed that the properties and exact quantities of incorporated CNTs influence the hydration and consistency of the composites. In order to address these issues, the surface functionalization of CNTs and rheological studies of the composites are performed. The hydration products and functional groups are carefully optimized and characterized by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and a Zeta potential analyzer. For Mixes 6 and 7, the compressive and tensile strength of CNTs incorporated in mortar specimens caused 77% and 48% increases in split tensile strength, respectively, and 17% and 35% increases in compressive strength, respectively, after 28 days of curing and compared withthe control Mix.

show abstract

“…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). Contrary to what is shown in the reference, functionalized nanotubes with carboxylic groups produced did not create a significant improvement in cement pastes mechanical properties, probably due to the addition of dispersing agents during tests.…”

Section: Mechanical Characterization Of Cement Mortars Test Tubes Witmentioning

confidence: 99%

Comparative study on high-strength structural elements and CNT additions

Fraga¹,

Campo

García

et al. 2016

Revista de la Construcción

View full text Add to dashboard Cite

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.

show abstract

Dispersion of carbon nanotubes and its influence on the mechanical properties of the cement matrix

Cited by 406 publications

References 34 publications

Effect of Nanotube Geometry on the Strength and Dispersion of CNT-Cement Composites

Effect of Nanotube Geometry on the Strength and Dispersion of CNT-Cement Composites

Hydration Phenomena of Functionalized Carbon Nanotubes (CNT)/Cement Composites

Comparative study on high-strength structural elements and CNT additions

Contact Info

Product

Resources

About