Effect of functionalized multi-walled carbon nanotubes on mechanical properties and durability of cement mortars

Sarvandani, Morteza Mansouri; Mahdikhani, Mahdi; Aghabarati, Hassan; Fatmehsari, Meisam Haghparast

doi:10.1016/j.jobe.2021.102407

Cited by 42 publications

(20 citation statements)

References 93 publications

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“…The reference mixture (Ref) presents a lower compressive strength compared with those containing the nanomaterial and surfactant, with or without ultrasonication. According to a report on the mechanical behavior of cementitious composites [28], [40], [41], the use of MWCNTs in pastes improved the compressive strength by up to 19%. These reports indicated that the main reason for this improvement was the performance of MWCNTs as bridging molecules connecting the matrix, which enhanced stress distribution.…”

Section: Hardened State Of Portland Cement Pastesmentioning

confidence: 99%

“…These results are in agreement with the results obtained from compressive strength tests. The improvement in the flexural strength of cementitious matrices with the incorporation of MWCNTs may be owing to the nanomaterial functioning as a reinforcing fiber, forming connections between cracks, and providing greater flexibility [40], [41].…”

Section: Hardened State Of Portland Cement Pastesmentioning

confidence: 99%

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Effect of ultrasonication on carboxyl-functionalized multiwalled carbon nanotubes in fresh and hardened Portland cement pastes

Ribeiro

Silva

Santos

et al. 2023

Rev. IBRACON Estrut. Mater.

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The effects of chemical and physical methods on multiwalled carbon nanotube (MWCNT) dispersion in Portland cement pastes were investigated. Consistency, rheology, compressive strength, dynamic elastic modulus, flexural strength, water absorption, and void content tests were performed to evaluate these effects. Changes in the rheology of the cement pastes and surfactants resulted in a significant reduction in apparent viscosity and yield strength. Additionally, cement pastes containing carboxyl- functionalized MWCNTs (MWCNT-COOH) and surfactant showed higher compressive strengths at 28 d. However, the ultrasonic dispersion method did not significantly influence the properties of hardened Portland cement compared with Portland cement produced using the non-sonicated aqueous solution.

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Section: Hardened State Of Portland Cement Pastesmentioning

confidence: 99%

Section: Hardened State Of Portland Cement Pastesmentioning

confidence: 99%

Effect of ultrasonication on carboxyl-functionalized multiwalled carbon nanotubes in fresh and hardened Portland cement pastes

Ribeiro

Silva

Santos

et al. 2023

Rev. IBRACON Estrut. 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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“…The phenomenon that CNTs with excellent mechanical properties do not significantly improve the performance of a cement-based material is mainly attributed to two reasons: (1) the high van der Waals interaction energy results in poor dispersion of CNTs and (2) the inert CNTs cannot form strong interfacial bonding with cement-based materials. , To solve these problems, Li et al used a mixture of a H 2 SO 4 and HNO 3 solution for surface oxidation treatment (carboxylation) of CNTs to improve the hydrophilicity of CNTs . The cement-based materials modified with CNTs-COOH can resist the erosion of harmful ions . However, Savilov et al showed that the cylindrical carbon nanotubes are mainly formed by sp 2 -hybrid carbon atoms, and the interface problem cannot be solved solely by the few carboxyl groups produced at the defects .…”

Section: Introductionmentioning

confidence: 99%

“…20 The cement-based materials modified with CNTs-COOH can resist the erosion of harmful ions. 21 However, Savilov et al showed that the cylindrical carbon nanotubes are mainly formed by sp 2 -hybrid carbon atoms, and the interface problem cannot be solved solely by the few carboxyl groups produced at the defects. 22 Meanwhile, the cationic bridging effect is formed between functionalized CNTs through Ca 2+ , presenting significant agglomeration in cement-based materials.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Cement Paste with Carboxylated Carbon Nanotubes and Poly(vinyl alcohol)

Zhao

Zhang

Qiao

et al. 2022

ACS Appl. Nano Mater.

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Cement has been a major consumable material for construction in the world since its invention, but its low flexural strength is the main defect affecting the service life of structures. To adapt cement-based materials to a more stringent environment, carboxylated carbon nanotubes (CNTs-COOH) and poly(vinyl alcohol) (PVA) are proposed to enhance the mechanical properties of cement paste. This study systematically verifies the synergistic effect of CNTs-COOH/PVA on the performance of cement paste. First, UV–Vis spectroscopy and FTIR spectroscopy prove that CNTs-COOH can provide attachment sites for PVA and PVA can improve the dispersion and stability of CNTs-COOH in water, which demonstrates the feasibility of synergistically enhancing cement paste. When a 0.015% CNTs-COOH suspension with 0.1% PVA is added, the flexural strength of the cement paste increases by 73, 32, and 42% compared with control specimens at curing ages of 3, 7, and 28 days, respectively. The strength enhancement mechanism is revealed from the aspects of cement matrix enhancement and interface enhancement. Thermogravimetric (TG) analysis and mercury intrusion porosimetry (MIP) prove that CNTs-COOH can enhance the hydration degree of the cement matrix and fill the pores introduced by PVA. Based on the fact that PVA can improve the dispersibility and the nucleation site effect of CNTs-COOH in cement paste, molecular dynamics simulation confirms that PVA can bridge CNTs-COOH and C–S–H to enhance the interfacial bonding by 64.1%.

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Effect of functionalized multi-walled carbon nanotubes on mechanical properties and durability of cement mortars

Cited by 42 publications

References 93 publications

Effect of ultrasonication on carboxyl-functionalized multiwalled carbon nanotubes in fresh and hardened Portland cement pastes

Effect of ultrasonication on carboxyl-functionalized multiwalled carbon nanotubes in fresh and hardened Portland cement pastes

Review of Boron Nitride Nanosheet-Based Composites for Construction Applications

Enhancement of Cement Paste with Carboxylated Carbon Nanotubes and Poly(vinyl alcohol)

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