Flexural and compressive strengths of carbon nanotube reinforced cementitious composites as a function of curing time

Huang, Jun; Rodrigue, Denis; Guo, Peipei

doi:10.1016/j.conbuildmat.2021.125996

Cited by 20 publications

(3 citation statements)

References 65 publications

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“…The long-term effects of multiwall carbon nanotube content on cement-based composites' compressive and flexural strengths with Weibull distribution functions, the results display distinct trends before and after 28 days. Additionally, the study contrasts European design codes with flexural and compressive strengths [14]. The Taguchi technique and Response Surface approach are preferred to streamline the experimental procedure in studies with extensive tests and datasets.…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of Mechanical Properties of Nano GGBFS in Concrete with Statistical Validation

Vincent,

Natarajan,

Amaladas

et al. 2023

Buildings

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Concrete, the most extensively utilized construction material, maintains its high demand owing to the swift urbanization and population expansion worldwide. However, cement manufacturing consumes considerable energy and emits substantial CO2 into the atmosphere. To ensure the construction industry’s sustainability, it is imperative to use eco-friendly and cost-effective products. As an additional cementitious ingredient in concrete, nano-based GGBFS (NGGBFS) is therefore employed to provide sustainable environmental impacts. The main purpose of this study is to assess the compressive strength, tensile strength, and Young’s modulus of NGGBFS, considering various replacement percentages (2%, 4%, 6%, 8%, 10%, and 12%) compared to conventional cement. The maximum compressive strength (72.68 MPa) and tensile strength (6.12 MPa) were obtained at 365 days for GB4 concrete. The Taguchi optimisation technique was employed to determine the interaction between mineral admixture and curing days on the mechanical properties of concrete; it reveals that GB4 mineral admixture and 365 days of curing days have good interaction between the factors taken for the study. The ANOVA quadratic regression model provided the optimisation process response. According to principal component analysis, the compression strength and Young’s modulus significantly influence the components because their loadings are so close (0.722 and 0.68). As a result, optimal combinations with equivalent strengths can be successfully created by substituting 8% nano-based GGBFS (GB4) in cement, offering an alternative path toward sustainable development.

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Section: Introductionmentioning

confidence: 99%

An Evaluation of Mechanical Properties of Nano GGBFS in Concrete with Statistical Validation

Vincent,

Natarajan,

Amaladas

et al. 2023

Buildings

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“…They can be used for numerous applications, from composites − to new biomaterials like biosensors and in medicine . The use of CNTs in cement and concrete-based applications started to attract considerable research interest only in the last decade. , In fact, recently it was shown that several different nanofillers can be used to prevent crack initiation and propagation in cement-based materials, thus improving the fracture toughness; therefore, nano-modified cements could be applied to reduce the risks caused by earthquakes, defects of construction, or pressure stresses . Moreover, when a conducting reinforcement is inserted in a cement matrix, if the reinforcement content is lower than the percolation threshold, electrical resistance is observed to be subject to the applied stress; this behavior allows the real-time mechanical monitoring of structures .…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Carbon Nanotubes for Improving the Mechanical and Electrical Properties of Oil-Well Cement-Based Composites

Lavagna

Bartoli

Suarez-Riera

et al. 2022

ACS Appl. Nano Mater.

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Carbon nanotubes are used to improve both the mechanical properties and electrical conductivity of cement, allowing the preparation of a strengthened and toughened cement that can be used for self-monitoring applications. Functionalization by reaction with acid is necessary to guarantee both a good dispersion in water and a strong interaction with cement. Sulfonitric acid (a solution of sulfuric acid and nitric acid) is the best oxidation treatment to decorate the surface of carbon nanotubes with polar groups. The time of treatment influences the mechanical and electrical properties of the composites, and in this work, the effect of the length of the treatment on both CNTs and composites was thoroughly analyzed. It was shown that a long-time oxidation treatment (90 min) was very effective to obtain well-dispersed carbon nanotubes that allow us to obtain cement-based composites with a large improvement of mechanical properties with respect to plain cement: 213% for flexural strength, 90% for fracture energy, and 20% for compressive strength. Furthermore, the electrical resistivity of cement-based composites was reduced to only 3% of the value of plain cement.

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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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Flexural and compressive strengths of carbon nanotube reinforced cementitious composites as a function of curing time

Cited by 20 publications

References 65 publications

An Evaluation of Mechanical Properties of Nano GGBFS in Concrete with Statistical Validation

An Evaluation of Mechanical Properties of Nano GGBFS in Concrete with Statistical Validation

Oxidation of Carbon Nanotubes for Improving the Mechanical and Electrical Properties of Oil-Well Cement-Based Composites

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

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