Effect of mixing duration on flexural strength of multi walled carbon nanotubes cementitious composites

Mohsen, Mohamed O.; Al‐Nuaimi, Nasser; Al‐Rub, Rashid K. Abu; Senouci, Ahmed; Bani-Hani, Kamal E.

doi:10.1016/j.conbuildmat.2016.09.073

Cited by 59 publications

(30 citation statements)

References 39 publications

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“…This may be related to the effect of the surfactant amount used to disperse the nanofilaments within the solution. Previous research by the authors on the effect of the mixing duration on the properties of cement paste showed that the largest amount of voids occurred in batches containing 0.08% CNT cement weight fraction [22]. By using qualitative and quantitative microstructural analysis, it was concluded that the larger voids' content is occurring due to the higher surfactant content remaining in the solution after the sonication process.…”

Section: Permeability Testmentioning

confidence: 89%

“…The mixing duration was selected to be a total of 60 minutes to provide better CNT dispersion in the concrete matrix. This was based on the previous findings of the authors where it was observed that a long mixing duration of 60 minutes could improve the CNT dispersion within the cement paste matrix and reduce the voids percent in the overall composite beams, which in return resulted in an incremental increase of about 100% in the flexural strength compared to the control plain cement batch [22]. The mixing procedure started by first placing the coarse aggregate in the mixer.…”

Section: Materials and Equipmentmentioning

confidence: 99%

“…Few researchers [20,21] were successful in obtaining an acceptable dispersion quality in water; however, when they blended their solutions with cement, poor dispersions and agglomerations were observed. Recently, Mohsen et al [22] succeeded in improving the dispersion of CNTs in cement paste by performing an innovative mixing procedure. The authors tested the effect of different mixing durations of 1.5, 15, 30, and 60 minutes on the flexural strength of cement and CNT composites.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Carbon Nanotube Effect on the Ductility, Flexural Strength, and Permeability of Concrete

Mohsen

Ansari

Taha³

et al. 2019

Journal of Nanomaterials

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Recently, remarkable types of carbon nanofilaments called carbon nanotubes (CNTs) have raised the interest of many concrete and cementitious composite researchers due to their significant mechanical, electrical, thermal, kinetic, and chemical properties. These nanofilaments are considered promising applicants to use in producing high-performance cement-based composite materials. In this research, the effect of CNT use on the flexural strength, strain capacity, permeability, and microstructure of concrete was investigated. Concrete batches of 0, 0.03, 0.08, 0.15, and 0.25 wt.% CNTs were prepared using a mixing method that consisted of a 30-minute solution sonication and a 60-minute batch mixing. On the 28th day, the mechanical properties were determined. The results indicated that concrete prepared using high CNT contents of 0.15 and 0.25 wt.% increased the flexural strength by more than 100% in comparison with 0% CNT concrete. Furthermore, the results showed that CNTs would increase the ductility of concrete beams by about 150%. The permeability test results showed the benefits of CNT inclusion in reducing the permeability of concrete. The permeability coefficient (kT) decreased by at least 45% when CNTs were added to concrete. A qualitative microstructural analysis illustrated the uniform dispersion of CNT filaments within the concrete hydration products in all batches.

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Section: Permeability Testmentioning

confidence: 89%

Section: Materials and Equipmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Carbon Nanotube Effect on the Ductility, Flexural Strength, and Permeability of Concrete

Mohsen

Ansari

Taha³

et al. 2019

Journal of Nanomaterials

Self Cite

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“…Mohsen et al [ 152 ] analysed the relation between the duration of the sonication applied to CNTs and the flexural strength achieved. By using a polycarboxylate-based superplasticiser, they achieved the following results.…”

Section: Nanoinclusionsmentioning

confidence: 99%

Nano-Inclusions Applied in Cement-Matrix Composites: A Review

et al. 2016

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Research on cement-based materials is trying to exploit the synergies that nanomaterials can provide. This paper describes the findings reported in the last decade on the improvement of these materials regarding, on the one hand, their mechanical performance and, on the other hand, the new properties they provide. These features are mainly based on the electrical and chemical characteristics of nanomaterials, thus allowing cement-based elements to acquire “smart” functions. In this paper, we provide a quantitative approach to the reinforcements achieved to date. The fundamental concepts of nanoscience are introduced and the need of both sophisticated devices to identify nanostructures and techniques to disperse nanomaterials in the cement paste are also highlighted. Promising results have been obtained, but, in order to turn these advances into commercial products, technical, social and standardisation barriers should be overcome. From the results collected, it can be deduced that nanomaterials are able to reduce the consumption of cement because of their reinforcing effect, as well as to convert cement-based products into electric/thermal sensors or crack repairing materials. The main obstacle to foster the implementation of such applications worldwide is the high cost of their synthesis and dispersion techniques, especially for carbon nanotubes and graphene oxide.

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“…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%

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

Mohsen

Taha

Taqa

et al. 2017

Journal of Nanomaterials

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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.

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Effect of mixing duration on flexural strength of multi walled carbon nanotubes cementitious composites

Cited by 59 publications

References 39 publications

Carbon Nanotube Effect on the Ductility, Flexural Strength, and Permeability of Concrete

Carbon Nanotube Effect on the Ductility, Flexural Strength, and Permeability of Concrete

Nano-Inclusions Applied in Cement-Matrix Composites: A Review

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

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