The mechanical properties of Portland cement mortars blended with carbon nanotubes and nanosilica: A study by experimental design

Reales, Oscar Aurelio Mendoza; Sierra-Gallego, G.; Tobón, Jorge Iván

doi:10.15446/dyna.v83n198.55559

Cited by 8 publications

(4 citation statements)

References 12 publications

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“…For example, some researchers [173,174] have studied chemical and surface modification methods for carbon nanotubes to improve their dispersion and bonding between carbon nanotubes and the matrix. Other studies [175,176,177] had examined the mechanical properties of cement samples, which were prepared with different combinations of carbon nanotubes and nano-silica. In addition, future researches must consider prediction models of the relationship between external mechanical deformations and electrical resistivity of cement-based composites incorporating CNTs.…”

Section: Challengesmentioning

confidence: 99%

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

et al. 2019

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Modern concrete infrastructure requires structural components with higher mechanical strength and greater durability. A solution is the addition of nanomaterials to cement-based materials, which can enhance their mechanical properties. Some such nanomaterials include nano-silica (nano-SiO2), nano-alumina (nano-Al2O3), nano-ferric oxide (nano-Fe2O3), nano-titanium oxide (nano-TiO2), carbon nanotubes (CNTs), graphene and graphene oxide. These nanomaterials can be added to cement with other reinforcement materials such as steel fibers, glass, rice hull powder and fly ash. Optimal dosages of these materials can improve the compressive, tensile and flexural strength of cement-based materials, as well as their water absorption and workability. The use of these nanomaterials can enhance the performance and life cycle of concrete infrastructures. This review presents recent researches about the main effects on performance of cement-based composites caused by the incorporation of nanomaterials. The nanomaterials could decrease the cement porosity, generating a denser interfacial transition zone. In addition, nanomaterials reinforced cement can allow the construction of high-strength concrete structures with greater durability, which will decrease the maintenance requirements or early replacement. Also, the incorporation of nano-TiO2 and CNTs in cementitious matrices can provide concrete structures with self-cleaning and self-sensing abilities. These advantages could help in the photocatalytic decomposition of pollutants and structural health monitoring of the concrete structures. The nanomaterials have a great potential for applications in smart infrastructure based on high-strength concrete structures.

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Section: Challengesmentioning

confidence: 99%

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

et al. 2019

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“…This result is similar to that obtained by the experimental investigations conducted by Oscar A. Mendoza-Reales and al, where a composite mortar with addition of nanosilica (NS) particles combined with multi-walled carbon nanotubes (MWCNT). Especially for the mortar with 7.3%NS and (0.0115%NS+7.3%MWCNT) (Oscar et al 2016).…”

Section: Results Of the Tensile Strength Of Mortarsmentioning

confidence: 97%

Evaluation of the physical-mechanical properties of mortar with cement/‘Ndoor’ composite binder

Takam¹,

Tatchuen²,

Tchitnga³

et al. 2022

Eng. Res. Express

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The aim of our work is to characterize a mortar with a cement/"Ndoor" composite binder. We determine experimentally the mechanical properties of a mortar modified by partial substitution of cement by an addition called "Ndoor". In experimental campaign, we realize different formulations of mortar diversified by the dosage of cement and "Ndoor", which were made in the form of prismatic specimens 4*4*16 cm3. Compression tests were carried out, which allowed us to obtain the values of compressive strength and tensile strength. The results show that the "Ndoor" improves the development of the mechanical resistances at the young age especially for values of substitution of the order of 2.5%, 5% and 7.5%. As a complement to the tests, a modeling having a predictive character of the elastic behavior of a mortar elastic behavior of a composite cement/"Ndoor" binder mortar is done. For this purpose, we have mortar has two phases : the hydrated cement paste and the inclusions (sand and "Ndoor"). The elastic properties of the cement paste are determined by the self-coherent homogenization model. Knowing the elastic properties of the cement paste and the inclusions, those of the mortar are deduced by the diluted scheme model of ESHELBY. The results show that, in the presence of the "Ndoor", as the mass ratio e/c increases, the Young’s modulus of the modified mortar decreases

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“…Zou et al, [22], added 0.075 wt % MWCNTs in OPC pastes and improved flexural strength and modulus of elasticity by 63 % and 32 %. Xu et al, [23], determined that CNTs can fill nanoscale pores of calcium silicate hydrate and reduce the porosity of OPC pastes [24].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Study of Portland Cement Containing Multi-walled Carbon Nanotubes (MWCNT)

Naoui¹,

Chala²,

Dorbani³

et al. 2023

J. Nano- Electron. Phys.

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The objective of this work is the thermodynamic study of portland cement containing multi-walled carbon nanotubes. The measurements of the thermal expansion coefficient of the two pure samples and its nanocomposite have the same shape. The dilatometric curves contain the same number of abnormalities. Their intensity differs from sample to sample. The calorimetric study reveals a similar character between the DSC curves of the two samples, the matrix and its nanocomposite. The thermogravimetry of the two materials shows the presence of several anomalies probably linked to the phenomena of dehydration. The insertion of the multi-walled carbon nanotubes into the cement made the nanocomposite stable over a wide temperature range compared to the cement matrix.

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The mechanical properties of Portland cement mortars blended with carbon nanotubes and nanosilica: A study by experimental design

Cited by 8 publications

References 12 publications

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

Evaluation of the physical-mechanical properties of mortar with cement/‘Ndoor’ composite binder

Thermodynamic Study of Portland Cement Containing Multi-walled Carbon Nanotubes (MWCNT)

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