Investigation of ultrasonication energy effect on workability, mechanical properties and pore structure of halloysite nanotube reinforced cement mortars

Rashidi, Yaser; Roudi, Mehdi Ranjkesh Rashteh; Korayem, Asghar Habibnejad; Shamsaei, Ezzatollah

doi:10.1016/j.conbuildmat.2021.124610

Cited by 13 publications

(4 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to their high surface energy, MWCNTs have a tendency towards agglomeration, which may lead to the creation of week zones in the final product. By using surfactants, the efficiency of sonication increases; as a result, a more uniform dispersion of MWCNTs in cementitious matrices can be seen [24].…”

Section: Percent Mwcntsmentioning

confidence: 99%

The Effect of Multi-Walled Carbon Nanotubes on the Compressive Strength of Cement Mortars

et al. 2022

View full text Add to dashboard Cite

In this work, multi-walled carbon nanotubes (MWCNTs) have been synthesized using a modified method of solid-phase pyrolysis. The MWCNTs are effectively dispersed using a simple and facile method such as ultrasonic energy without and with surfactant for two different sonication times (15 min and 40 min). In the present study, the effect of MWCNT concentration (0.001, 0.01, 0.05, 0.1 wt.%) on the compressive strengths of cement mortars has been investigated. Compressive tests were carried out on an automatic pressure machine (C089) with a loading rate of 0.5 kN/s at the age of 7 days and 28 days. It is shown that the optimal value of the nanotubes’ concentration does not exist in the case of 15 min of sonication time, whereas the optimal value for 40 min of sonication time without and with surfactant is 0.01%. Moreover, in the absence of surfactants, the strength of the specimen over 7 days of hardening increased by 13%, and by 19.5% in the presence of surfactants. The compressive strength for a curing period of 28 days increased by 6.3% and 13.8%, respectively.

show abstract

Section: Percent Mwcntsmentioning

confidence: 99%

The Effect of Multi-Walled Carbon Nanotubes on the Compressive Strength of Cement Mortars

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In addition, the toxicity of nanoparticles is a significant drawback that needs to be considered because it is harmful to both humans and animals. 18 the main barriers hindering the industrialization of nanoparticles is their uniform dispersion within large quantities of cementitious composites. Uniform dispersion demands high amounts of energy, making it impossible to achieve single-or few-layered nanosheets in most cases.…”

Section: Introductionmentioning

confidence: 99%

“…While nanoparticles have great potential to enhance the characteristics of cementitious composites, high synthesis costs limit their applications in the construction industry. In addition, the toxicity of nanoparticles is a significant drawback that needs to be considered because it is harmful to both humans and animals . Furthermore, one of the main barriers hindering the industrialization of nanoparticles is their uniform dispersion within large quantities of cementitious composites.…”

Section: Introductionmentioning

confidence: 99%

Dispersion Stability and the Reaction Mechanism of Boron Nitride Nanosheets in a Cementitious Alkaline Environment: An Experimental and Computational Study

Ranjkesh Rashteh Roudi,

Hosseini,

Ranjkesh

et al. 2024

ACS Appl. Nano Mater.

Self Cite

View full text Add to dashboard Cite

Boron nitride nanosheets (BNNSs) have attracted the attention of researchers for their extraordinary mechanical properties, large surface areas, and strong interactions with the host matrix, making them ideal candidates as supplementary materials for the construction industry. However, the major challenge associated with the incorporation of BNNSs in cement-based materials is their unfavorable dispersion in a cementitious alkaline environment. In this work, experimental and computational methods were employed to trace the influential factors that hindered the proper dispersion of BNNSs within cementitious composites. The results showed that the BNNS dispersion remained stable in mild alkaline environments with pH values ranging from 7.5 to 12.2, but high alkalinity (pH = 13.1) reduced the BNNS dispersion. Among the various cations, Ca 2+ is the most reactive cation for BNNS agglomeration in a cementitious alkaline environment. To protect BNNS against these influential factors, polycarboxylate ether-based superplasticizer (PCE) was selected as a suitable treatment to improve the dispersion stability of BNNS within cementitious composites. The formation of covalent bonds between calcium silicate hydrate and BNNS resulted in enhanced charge transfer and consequently improved the load transfer from the matrix to the BNNS. Finally, based on the mechanical tests, with the addition of only 0.01 wt % PCE-treated BNNSs, the compressive and flexural strengths of the cement samples improved by 43 and 13%, respectively, which clearly showed the significance of stable BNNS dispersion using PCE on the performance of the final cement composite. The results of this study could improve the fundamental understanding of BNNS-containing cementitious nanocomposites.

show abstract

“…Conventional concrete has been a great limitation to the modernization of the construction industry, over the past few decades, due to its low tensile strength, quasi-brittle structure, and vulnerability to chemical attacks. − Nanotechnology appears to be a promising way to revolutionize concrete manufacturing, and study in this field can bring significant performance rewards for the construction industry. A review of the literature shows that nanoparticles such as nanosilica, − carbon nanotube (CNT), − and graphene oxide (GO) − can improve microstructure, ,, enhance mechanical properties, − and provide better electrical and thermal properties of cementitious composites. − …”

Section: Introductionmentioning

confidence: 99%

Review of Boron Nitride Nanosheet-Based Composites for Construction Applications

Roudi

Ranjkesh

Korayem

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Two-dimensional nanoparticles stand out among nanoparticles for their extraordinary mechanical properties, large surface area, and strong interaction with the host matrix, which can boost properties of various construction materials. Boron nitride nanosheets (BNNSs), known as white graphene, show nonsensitive behavior against increasing thickness as well as high chemical and thermal stability that makes them suitable for fabrication of advanced composites in various industries. Despite these proven benefits, the role of BNNS in cementitious composites has not been fully investigated in the literature because of some inconsistent results such as its unfavorable behavior in aqueous solution. This study presents a comprehensive review of BNNS in silicate-based matrices from molecular-level interactions to macroscale properties to give potential avenues for manufacturing boron nitride-based composites for construction applications. The prime focus of this review article is to highlight the role of proper dispersion and stabilization of the dispersed BNNS within both aqueous solutions and cement matrix, which is reflected in the properties of fabricated cementitious composites in their fresh and hardened states. In addition, considering the structural similarity between BNNS and graphene-based nanosheets, the paper also compares BNNS and graphene-based cementitious composites. Finally, the existing gaps of knowledge are highlighted for future studies.

show abstract

Investigation of ultrasonication energy effect on workability, mechanical properties and pore structure of halloysite nanotube reinforced cement mortars

Cited by 13 publications

References 44 publications

The Effect of Multi-Walled Carbon Nanotubes on the Compressive Strength of Cement Mortars

The Effect of Multi-Walled Carbon Nanotubes on the Compressive Strength of Cement Mortars

Dispersion Stability and the Reaction Mechanism of Boron Nitride Nanosheets in a Cementitious Alkaline Environment: An Experimental and Computational Study

Review of Boron Nitride Nanosheet-Based Composites for Construction Applications

Contact Info

Product

Resources

About