Mechanical performance of metakaolin-based geopolymer mortar blended with multi-walled carbon nanotubes

Oualit, Mehena; Irekti, Amar

doi:10.1016/j.ceramint.2022.02.166

Cited by 28 publications

(2 citation statements)

References 30 publications

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“…Microwave functionalization techniques can also be used [14] but the difficulty lies in the limitation of the materials (vertically oriented CNMs). The authors [15] used inductive coupled plasma for oxidation, but the degree of functionalization and product yield were extremely low and lead to the formation of ester and carboxylic groups.…”

Section: Theorymentioning

confidence: 99%

Effect of chemical treatment of multi-walled carbon nanotubes on the specific capacitance of supercapacitors

et al. 2022

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To date, the research on carbon nanomaterials has progressed rapidly. More than 400 papers were written in 2021 on the application of carbon nanomaterials in various fields. The high demand for the use of such materials has increased due to a sharp increase in the demand for semiconductor materials and materials for supercapacitor electrodes and other electrical devices. Despite the unique physical properties of carbon nanomaterials, there are limitations to their use. To solve this problem, various methods of modifying the surface, both through chemical interactions and physical adsorption, were proposed. One of these methods is chemical modification. The evaluation of effect of chemical treatment parameters on the properties of carbon nanomaterials is an urgent task due to the fact that the chemistry of the processes is poorly understood. In this work, the effect of concentrated sulfuric and nitric acids on the change of specific surface area, elemental composition, composition of functional groups, and also on the change of specific capacitance was considered. It is believed that both the porosity and the functional groups formed during oxidation contribute to the change in specific capacitance. The specific surface area of all samples decreased on average by a factor of 1.5–3 after the chemical treatment. Different oxygen and sulfur-containing functional groups are observed after the chemical treatment. The highest specific capacitance of the treated carbon nanofibers was 114 F/g.

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Section: Theorymentioning

confidence: 99%

Effect of chemical treatment of multi-walled carbon nanotubes on the specific capacitance of supercapacitors

et al. 2022

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“…Incorporating nanomaterials in cementitious and geopolymer matrices is a constant practice that mainly intends to enhance mechanical performance [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ] or even confer new thermal, optical, and electrical properties [ 8 , 9 , 10 , 11 ]. The fact is that the effects of nanomaterials addition are also conditioned by their good dispersion [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of CNTs and SiC Whiskers Effect on the Rheology and Mechanical Performance of Metakaolin-Based Geopolymers

et al. 2022

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Despite geopolymers having emerged as a more sustainable alternative to Portland cement, their rheological properties still need to be thoroughly investigated, aiming at the material’s applicability. Additionally, studies that evaluated the fresh state of geopolymer composites with nanomaterials are scarce. Thus, two metakaolin-based geopolymer systems were reinforced with nanomaterials with a similar geometry: carbon nanotubes (CNT) and silicon carbide whiskers (SCW). The nanomaterials incorporation was assessed by rotational rheometry (conducted up to 110 min), isothermal calorimetry, compressive strength after 7 and 28 days, and the microstructure was investigated using X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). CNT and SCW incorporation (0.20 wt.%) did not significantly affect the yield stress and viscosity of the R2-group (based on metakaolin type 2), while increasing the rheological parameters up to 56.0% for the R1-group (based on metakaolin type 1). Both additions modified the reaction kinetics. Increments of up to 40.7% were observed in the compressive strength of geopolymer pastes with the incorporation of a SCW content of 0.2 wt.%. XRD and FTIR results suggest similar structural modifications between precursors. Nevertheless, R2 showed substantial transformations while the R1 group exhibited anhydrous material that can react over time. Overall, incorporating CNT and SCW contributed to higher mechanical increments on systems with average mechanical strength (R1) compared to systems with higher potential mechanical performance (R2).

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Geopolymer concrete containing nanomaterials—a step toward sustainable construction

Indwar,

Mishra,

Titiksh

2024

Environ Sci Pollut Res

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Mechanical performance of metakaolin-based geopolymer mortar blended with multi-walled carbon nanotubes

Cited by 28 publications

References 30 publications

Effect of chemical treatment of multi-walled carbon nanotubes on the specific capacitance of supercapacitors

Effect of chemical treatment of multi-walled carbon nanotubes on the specific capacitance of supercapacitors

Evaluation of CNTs and SiC Whiskers Effect on the Rheology and Mechanical Performance of Metakaolin-Based Geopolymers

Geopolymer concrete containing nanomaterials—a step toward sustainable construction

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