Research on the effect of carbon nanotubes on cracking and impact properties of rubber aggregate mortar

Junchao, Yang; Zhu, Han; Chun-e, Sui; Borito, Said Mirgan; Zhao, Yunfeng; Shao, Jianwen

doi:10.1016/j.jobe.2021.103127

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…In recent decades, nanotechnology as an alternative has attracted the attention of researchers for improving the properties of cementitious composites. The literature shows that the incorporation of nanoparticles, such as nano-TiO 2 , , carbon nanotube, − and graphene oxide − in cementitious composites can effectively enhance their brittle structure, microstructure, strength, and durability performance. For instance, it was reported that the flexural and compressive strengths of reactive powder concrete reinforced with nano SiO 2 -coated TiO 2 improved by 87% MPa and 12.26% MPa compared with the plain sample.…”

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.

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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.

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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.

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“…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.

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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.

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Durability and Fractal Analysis of Pore Structure of Crumb Rubber Concrete Modified with Carbon Nanotubes

Shao

Zhu²,

Haruna³

et al. 2023

Arab J Sci Eng

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Research on the effect of carbon nanotubes on cracking and impact properties of rubber aggregate mortar

Cited by 5 publications

References 10 publications

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

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

Durability and Fractal Analysis of Pore Structure of Crumb Rubber Concrete Modified with Carbon Nanotubes

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