Compressive strength and microstructure of carbon nanotubes–fly ash cement composites

Chaipanich, Arnon; Nochaiya, Thanongsak; Wongkeo, Watcharapong; Torkittikul, Pincha

doi:10.1016/j.msea.2009.09.039

Cited by 277 publications

(120 citation statements)

References 35 publications

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“…This has also been compared with non-functionalized CNTs. The microstructural investigation of the nanocomposites reveals that CNT helps in filling upmicro/nano pores between the calcium silicate hydrate (CSH) and ettringite during the process of hydration, which is in agreement with previous studies [34,[38][39][40][41][42]. It is also envisaged that providing an adequate force between CNTs and the composite matrix is essential, which provides information for better understanding of the load transfer mechanisms in composite materials.…”

Section: Introductionsupporting

confidence: 88%

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

Balasubramaniam

Mondal

Ramasamy

et al. 2017

Fibers

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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.

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Section: Introductionsupporting

confidence: 88%

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

Balasubramaniam

Mondal

Ramasamy

et al. 2017

Fibers

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“…O estudo de Chaipanich et al [14] comprovou que a adição de nanotubos de carbono aumentou a resistência de cimentos compostos com cinzas volantes. Em sua pesquisa, foram analisados os teores de 0,5% e 1% de NTCs em relação à massa de cimento, sendo que o segundo com 20% de cinza volante apresentou 10% de aumento na resistência à compressão.…”

Section: Nanotubos De Carbono Em Compósitos De Cimento Portlandunclassified

Compósitos de cimento Portland com adição de nanotubos de carbono (NTC): Propriedades no estado fresco e resistência à compressão

Medeiros¹,

Dranka²,

Mattana³

et al. 2015

Matéria (Rio J.)

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Alguns estudos têm sido desenvolvidos sobre a adição de nanotubos de carbono (NTCs) em compósitos cimentícios e indicam melhorias nas propriedades mecânicas, como aumento da resistência à compressão, à tração e diminuição da porosidade. Com base nessas possíveis melhorias, essa pesquisa foi realizada para analisar a influência dos NTCs na resistência à compressão e fluidez de compósitos de cimento Portland que possam ser usados para reabilitação de estruturas de concreto. Desse modo, foram realizados ensaios de resistência à compressão, squeeze flow, flow table, funil de Marsh e miniabatimento. Foram fixadas uma argamassa e uma pasta de referência (sem adição de nanotubos de carbono), que foram replicadas com mesmo traço e a incorporação de 5 teores de NTCs em relação à massa de cimento: 0,1%, 0,2%, 0,3%, 0,4% e 0,5%. Estes teores foram escolhidos de modo a abranger a faixa de teores mais usadas nas pesquisas sobre NTCs adicionados aos compósitos de cimento Portland. Com relação aos ensaios de medição de fluidez, foi constatado que quanto maior o teor de NTC, mais consistente o compósito cimentício, com indícios de que os teores menores ou iguais a 0,3% são mais adequados para manter a fluidez do compósito de cimento Portland. No caso da resistência à compressão, os resultados indicam que a adição de 0,40% de nanotubos de carbono tende a elevar a resistência em 27%. Por outro lado, a adição de 0,5% de NTC deixou o compósito tão consistente que dificultou a moldagem e a elevação da resistência foi nula comparada a série de referência.

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“…A large number of experimental studies on the mixing of nanomaterials and cement mortars to improve the mechanical strength of the latter have been conducted [8][9][10][11][12][13][14][15][16]. A study by Seo on improving the mechanical strength of nanocement mortars involved mixing with a MWCNT solution, where compressive strength experiments were conducted with MWCNT cement mortars.…”

Section: Introductionmentioning

confidence: 99%

Heating Experiment of CNT Cementitious Composites with Single-Walled and Multiwalled Carbon Nanotubes

Lee¹,

Kang²,

Song³

et al. 2017

Journal of Nanomaterials

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Carbon nanotubes (CNTs) are a primary nanomaterial that have outstanding physical and mechanical characteristics, and CNTs can be combined with cement-based materials to alter their heating characteristics. In this study, the types of CNTs used were multiwalled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs). Experiments were performed to determine the altered heating characteristics of the CNT cement mortars. The parameters of the experiment were CNT type, CNT content, curing age, and applied voltage. The results for the different CNT cement mortars indicate that mixing SWCNTs with water to produce CNT cement mortars was more effective for modifying the heating characteristics compared to mixing MWCNTs with water. In addition, field emission scanning electron microscope (FE-SEM) images supported the results found in the heating experiments.

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Compressive strength and microstructure of carbon nanotubes–fly ash cement composites

Cited by 277 publications

References 35 publications

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

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

Compósitos de cimento Portland com adição de nanotubos de carbono (NTC): Propriedades no estado fresco e resistência à compressão

Heating Experiment of CNT Cementitious Composites with Single-Walled and Multiwalled Carbon Nanotubes

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