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

Muradyan, Nelli Gagik; Gyulasaryan, Harutyun; Arzumanyan, Avetik A.; Badalyan, Maria M.; Kalantaryan, Marine A.; Vardanyan, Yeghiazar V.; Laroze, David; Manukyan, Aram; Barseghyan, M.G.

doi:10.3390/coatings12121933

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…As a binder for the mortars in this study, ordinary Portland cement 52.5 (GOST 31108-2020) was used, which is available at Ararat cement Factory in Yerevan, Armenia. Table 1 displays the chemical composition and physical properties of the cement used in the study [ 30 , 31 ], in accordance with GOST EN 196-1-2002 [ 32 ], 196-2-2002 [ 33 ], and 196-3-2002 [ 34 ]. Meanwhile, Table 2 and Table 3 provide the physical and chemical properties of the sand and biosilica, respectively, that were used in the study.…”

Section: Methodsmentioning

confidence: 99%

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The Use of Biosilica to Increase the Compressive Strength of Cement Mortar: The Effect of the Mixing Method

et al. 2023

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In this work, the effect of biosilica concentration and two different mixing methods with Portland cement on the compressive strength of cement-based mortars were investigated. The following values of the biosilica concentration of cement weight were investigated։ 2.5, 5, 7.5, and 10 wt.%. The mortar was prepared using the following two biosilica mixing methods: First, biosilica was mixed with cement and appropriate samples were prepared. For the other mixing method, samples were prepared by dissolving biosilica in water using a magnetic stirrer. Compressive tests were carried out on an automatic compression machine with a loading rate of 2.4 kN/s at the age of 7 and 28 days. It is shown that, for all cases, the compressive strength has the maximum value of 10% biosilica concentration. In particular, in the case of the first mixing method, the compressive strength of the specimen over 7 days of curing increased by 30.5%, and by 36.5% for a curing period of 28 days. In the case of the second mixing method, the compressive strength of the specimen over 7 days of curing increased by 23.4%, and by 47.3% for a curing period of 28 days. Additionally, using the first and second mixing methods, the water absorption parameters were reduced by 22% and 34%, respectively. Finally, it is worth noting that the obtained results were intend to provide valuable insights into optimizing biosilica incorporation in cement mortar. With the aim of contributing to the advancement of construction materials, this research delves into the intriguing application of biosilica in cement mortar, emphasizing the significant impact of mixing techniques on the resultant compressive strength.

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Section: Methodsmentioning

confidence: 99%

“…The w/c ratio used in the present study was 0.47, and the used cement/sand proportion was 1:4 [ 31 ]. Two different mixing methods of biosilica were used for sample preparation.…”

Section: Methodsmentioning

confidence: 99%

The Use of Biosilica to Increase the Compressive Strength of Cement Mortar: The Effect of the Mixing Method

et al. 2023

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“…Due to hydration processes, nuclei of hydration products are formed on the CNT surface. They concentrate hydrate formations, which leads to an improvement in the mechanical characteristics of the cement matrix [7][8][9][10]. It was noted in [7] that when the proper dispersion of CNTs is achieved, hydrated products of cement, including C-S-H and Ca(OH) 2 , interact with active CNTs.…”

Section: Introductionmentioning

confidence: 99%

Study of properties of cements and concrete mixtures with carbon nanotubes

Kozlova,

Zemskova,

Skopova

et al. 2023

E3S Web Conf.

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The development of nanotechnology contributes to the production of a new generation of multifunctional building materials. Carbon nanotubes (CNTs) are one of the components that make it possible to obtain such materials. CNTs are so small that they are prone to aggregation. To exclude this phenomenon, it is necessary to subject the particles to ultrasonic dispersion and stabilization. The purpose of the study was determined, which is to stabilize CNT suspensions and study of the properties of cements and concrete mixtures containing stabilized CNT particles in their composition. During the research, we have established the optimal dispersion parameters (t = 25±2 °C, υ = 44 kHz, τ<30 min) and the stabilizer concentration (5 g/l). The tests on the compressive strength of modified cement samples showed that the complex additive, which includes polycarboxylates and CNTs, gives the maximum increase in strength in the first day by 60%, in 28 days - by 20%. The introduction of CNTs into the composition of the concrete mix increased the compressive strength by 32% on the 3rd day of hardening, and by 34-39% on the 28th day compared to the control composition without additives.

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“…Muradyan [26] studied the effects of different CNTs concentration (0.001, 0.01, 0.05, and 0.1 wt.%) on the compressive strengths of cement mortars. The results show that the 7 d strengths of the specimens increase by 13% and 19.5% with and without surfactant, respectively, and that the 28 d compressive strengths increase by 6.3% and 13.8%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of the Mechanical Properties and Mix Proportion of Multiscale-Fibre-Reinforced Engineered Cementitious Composites

Yang,

Wang,

Chen

et al. 2023

Polymers

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Engineered cementitious composites (ECCs) are cement-based composite materials with strain-hardening and multiple-cracking characteristics. ECCs have multiscale defects, including nanoscale hydrated silicate gels, micron-scale capillary pores, and millimetre-scale cracks. By using millimetre-scale polyethylene (PE) fibres, microscale calcium carbonate whiskers (CWs), and nanoscale carbon nanotubes (CNTs) as exo-doped fibres, a multiscale enhancement system was formed, and the effects of multiscale fibres on the mechanical properties of ECCs were tested. The Box-Behnken experimental design method, which is a response surface methodology, was used to construct a quadratic polynomial regression equation to optimise ECC design and provide an optimisation of ECC mix proportions. The results of this study showed that a multiscale reinforcement system consisting of PE fibres, CWs, and CNTs enhanced the mechanical properties of ECCs. CWs had the greatest effect on the compressive strengths of highly ductile-fibre-reinforced cementitious composites, followed by CNTs and PE fibres. PE fibres had the greatest effect on the flexural and tensile strengths of high-ductility fibre-reinforced cementitious composites, followed by CWs and CNTs. The final optimisation results showed that when the ECC matrix was doped with 1.55% PE fibres, 2.17% CWs, and 0.154% CNTs, the compressive strength, flexural strength, and tensile strength of the matrix were optimal.

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

Cited by 7 publications

References 26 publications

The Use of Biosilica to Increase the Compressive Strength of Cement Mortar: The Effect of the Mixing Method

The Use of Biosilica to Increase the Compressive Strength of Cement Mortar: The Effect of the Mixing Method

Study of properties of cements and concrete mixtures with carbon nanotubes

Optimisation of the Mechanical Properties and Mix Proportion of Multiscale-Fibre-Reinforced Engineered Cementitious Composites

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