Modification of microstructure and mechanical properties of cement by nanoparticles through a sustainable development approach

Sadeghi‐Nik, Aref; Berenjian, Javad; Bahari, Ali; Safaei, Abdul Sattar; Dehestani, Mehdi

doi:10.1016/j.conbuildmat.2017.08.107

Cited by 89 publications

(30 citation statements)

References 77 publications

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“…The addition of nanoparticles can increase up to 15% the compressive strength, especially when to 2% of nanoparticles are used. This means that, if the goal is to produce a concrete with a certain target for the compressive strength, the nanoparticles can be used to reduce the amount of cement required, comparatively to mixtures without nanoparticles, corroborating the studies carried out by Bahadori and Hosseini (2012) and Sadeghi-Nik et al (2017).…”

Section: Discussionsupporting

confidence: 70%

Influence of Nano-SiO2, Nano-Al2O3, and Nano-ZnO Additions on Cementitious Matrixes with Different Powder and Steel Fibers Content

Carmo

Costa

Soldado

et al. 2021

ACT

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In the study herein presented three types of nanoparticles, with different dosages, were used, namely nano-SiO 2 , nano-Al 2 O 3 and nano-ZnO, which were combined with different concrete formulations. The main goal is to improve the eco-efficiency of concrete, using simultaneously a partial replacement of Portland cement by industrial by-products and reduced amounts of nanoparticles, aiming to avoid the reduction, or even enhance, both mechanical and durability properties of the final mixtures. The interaction between the steel fibers added to the matrixes and the nanoparticles is also addressed. To analyze the effects of nanoparticles additions in the properties of both mortar and concrete mixtures, several tests were performed in fresh and hardened states. Durability indicators were also evaluated, namely, capillary absorption, immersion water absorption and carbonation depth. It was concluded that an increase of both flexural and compressive strengths can be obtained with nanoparticles additions, but that effect depends on the powder dosages used in the binder matrixes and on the type and dosages of nanoparticles. Regarding the matrixes with steel fibers, no additional gains were obtained combining simultaneously nanoparticles with those fibers. It was also concluded that the nano-ZnO addition significantly delay the concrete hardening and show a negative effect when combined with the steel fibers.

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Section: Discussionsupporting

confidence: 70%

Influence of Nano-SiO2, Nano-Al2O3, and Nano-ZnO Additions on Cementitious Matrixes with Different Powder and Steel Fibers Content

Carmo

Costa

Soldado

et al. 2021

ACT

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show abstract

“…However, the authors' statistical analysis reported inconsistent results in the flexural strength of cementitious materials reinforced with CNTs (herein, CNT-cement composites) [7]. The discrepancy can be attributed to the CNT dispersion and bonding states within the cement matrix [14][15][16]. The bond strength between CNTs and the cement matrix is governed by multiple factors including CNT type, surface condition and dispersion quality [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic model for flexural strength of carbon nanotube reinforced cement-based materials

Ramezani

Kim

Sun

2020

Composite Structures

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The bond between carbon nanotubes (CNTs) and cementitious materials is the key characteristic for predicting the flexural strength. However, CNT dispersion quality may change the bonding mechanism. A probabilistic approach can benefit the deterministic models to capture the uncertainties affecting these characteristics. This study proposes a probabilistic model using the Kelly-Tyson theory to predict the flexural strength of CNT-cement nanocomposites. The proposed model considers the effects of experimental variables on CNT dispersion quality, bonding mechanism and the flexural strength. To this end, a Bayesian methodology is employed to calibrate the unknown model parameters and various sources of uncertainty using extensive test data. The model is then used to identify the optimum ranges of variables to maximize the flexural strength through computing the failure probability which is defined as the probability of not meeting certain strength requirements (herein, 50% increase compared with the control). The model suggests that CNT aspect ratio ranges from 400 to 800 and concentration between 0.08 and 0.18 c-wt% yields the highest flexural strength. Finally, the effect of changes in experimental variables on the probability estimates is examined using sensitivity and importance measures. The analysis reveals that the proposed model can capture the experimentally observed trends with reasonable accuracy. For example, the importance of age increases as CNT concentration increases.

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“…It also governs the long-term structural behaviors such as creep and relaxation. Therefore, many researchers have tried to improve the elastic modulus using various types and sizes of materials (e.g., fibers and particles) to produce cementitious composite [1][2][3][4][5][6][7][8]. Fibers, such as steel and carbon, can normally improve the strength of the composite, thus minimizing the risk of cracking and helping to reduce the cross section dimensions [9].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the use of carbon nanotubes (CNTs) as the reinforcement in cementitious materials (cement paste, cement mortar, and concrete) has attracted considerable attention of researchers [10][11][12][13]. Although CNT exhibits the elastic modulus in the order of 1 TPa [14,15] with tensile strength ranges from 11 to 63 GPa [16], the elastic modulus of CNT reinfoirced composites is much lower than that of expected with two underlying factors: dispersion quality and bond mechanisms of CTNs within cementitious composites [5,8]. Some researchers reported that the elastic modulus of CNT reinforced cementitious materials could be significantly increased against the control [10,17].…”

Section: Introductionmentioning

confidence: 99%

Elastic modulus formulation of cementitious materials incorporating carbon nanotubes: Probabilistic approach

Ramezani

Kim

Sun

2021

Construction and Building Materials

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Modification of microstructure and mechanical properties of cement by nanoparticles through a sustainable development approach

Cited by 89 publications

References 77 publications

Influence of Nano-SiO<sub>2</sub>, Nano-Al<sub>2</sub>O<sub>3</sub>, and Nano-ZnO Additions on Cementitious Matrixes with Different Powder and Steel Fibers Content

Influence of Nano-SiO<sub>2</sub>, Nano-Al<sub>2</sub>O<sub>3</sub>, and Nano-ZnO Additions on Cementitious Matrixes with Different Powder and Steel Fibers Content

Probabilistic model for flexural strength of carbon nanotube reinforced cement-based materials

Elastic modulus formulation of cementitious materials incorporating carbon nanotubes: Probabilistic approach

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