Recent Advancements in Carbon Nano-Infused Cementitious Composites

Goldmann, Eryk; Górski, Marcin; Klemczak, Barbara

doi:10.3390/ma14185176

Cited by 9 publications

(6 citation statements)

References 112 publications

(177 reference statements)

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“…A curve consists of an up curve when the container with mortar accelerates and a down curve when it slows down. From the lower part of the resulting loop, the parameters g and h can be derived according to Equation (1). In order to aid with correlating the results, the air content and volume density were measured.…”

Section: Resultsmentioning

confidence: 99%

“…Carbon nanotubes (CNTs) are currently among the most widely researched carbon nanofillers for cementitious materials [1]. Besides improvement in the mechanical properties of the cement matrix, their elongated shape, very high conductivity, and aspect ratio make them a potent choice for electrically conductive smart cementitious materials, which are used as structural health monitoring sensors [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Rheological Properties of Carbon Nanotube Infused Cementitious Composites with Various Amounts of CNT

Goldmann,

Cygan,

Klemczak

et al. 2023

Buildings

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The addition of carbon nanotubes (CNTs), which are hydrophobic materials, significantly influences the rheology of cementitious materials but requires important mix modifications in order to provide proper flowability for further use. This paper investigates the influence of various dosages of carbon nanotubes (0.05 wt.%, 0.1 wt.%, 0.2 wt.%, 0.5 wt.%, and 1 wt.%) on the flowability, rheological parameters, air content, and volume density of cement mortars. The results show an increase in the yield stress parameter with an increment in CNT dosage up to the threshold of 0.5 wt.% for mixes with an increased amount of cement. For standard proportions, it was on a stable level for all mixes except for 0.2 wt.%. The plastic viscosity parameter also increased with the CNT dosage; mixes with standard proportions of components were not higher than the reference, and mixes with an increased amount of cement were lower than the reference for dosages up to 0.5 wt.% of CNT. The addition of a superplasticizer and modifications of the ratio of the components were employed to achieve proper flowability and measure the rheological parameters. The presented results show that regardless of the negative influence of carbon nanotubes on the properties of fresh mortar, it is possible to achieve a stable flow and workability using simple modifications of the composition.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rheological Properties of Carbon Nanotube Infused Cementitious Composites with Various Amounts of CNT

Goldmann,

Cygan,

Klemczak

et al. 2023

Buildings

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“…Cement-based composites are the most widely used building materials in the world [ 1 ]. However, there are problems with micro-cracks and micro-defects in cement-based composites after curing due to brittleness—it causes stress concentration and produces a large number of macro-cracks under loading force [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructure of Calcium Sulfate Whisker-Reinforced Cement-Based Composites

Cao

Liu

et al. 2022

Materials

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This study aims to investigate the effect of calcium sulfate whisker (CSW) on the properties and microstructure of cement-based composites. Further, nanosilica (NS) was used as a comparison. The results show that the compressive strength and fracture toughness of cement-based composites increased by 10.3% and 10.2%, respectively, with 2% CSW. The flexural strength, splitting tensile strength, and fracture energy increased by 79.7%, 34.8%, and 28.7%, respectively, with 1% CSW. With the addition of CSW, shrinkage deformation was aggravated, and the capillary water absorption coefficients were clearly reduced. Compared with NS, CSW-reinforced cement-based composites show better tensile, flexural, and fracture properties and smaller shrinkage deformations and capillary water absorption coefficients. The residual mechanical properties of all groups improve when the treating temperature is lower than 400 °C and decline rapidly when the temperature goes over 600 °C. When treated at 900 °C, the residual mechanical properties are 40% less than those at ambient temperature, with the NS group showing the best performance, followed by the control group and the CSW group. X-ray diffraction (XRD) and scanning electron microscopy (SEM) tests show that the addition of CSW improves the microstructure of the matrix. CSW can reinforce and toughen composites by generating ettringite and whisker pullout, whisker breakage, crack bridging, and crack deflection at the microstructure level.

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“…This field enables the development of space technologies and of common technologies of social value such as construction. Nanomaterials are increasingly present in electronic and electro-optical devices [9,10].…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoparticles (AgNPs) in Urea Solution in Laboratory Tests and Field Experiments with Crops and Vegetables

Jaskulski

Jaskulska

Majewska³

et al. 2022

Materials

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Nanotechnology and nanomaterials, including silver nanoparticles (AgNPs), are increasingly important in modern science, economics, and agriculture. Their biological activity involves influencing plant health, physiological processes, growth, and yields, although they can also be toxic in the environment. A new fertiliser was made based on a urea solution with a relatively low content of AgNPs obtained by the reduction of silver nitrate V. Laboratory tests were used to assess the effect of a fertiliser solution containing 10 ppm AgNPs on the germination of agricultural plant seeds (barley, peas, oilseed rape) and vegetables (radish, cucumber, lettuce) and its foliar application on chlorophyll content, stomatal conductance, and seedling biomass. Field experiments were conducted to assess the effect that a foliar application of 15 ppm AgNPs in working liquid had on physiological plant parameters and yields of rape and cucumber. The AgNPs in the tested fertiliser reduced infestation of the germinating seeds by pathogens and positively affected the physiological processes, productivity, and yields of plants. Plant response depended on plant species and habitat conditions. Reduced pathogen infestation of seeds, higher germination energy, increased chlorophyll content and stomatal conductance, and higher seedling masses all occurred under the influence of AgNPs, mainly in oilseed rape and cucumber, and especially under thermal stress. The beneficial effect of AgNPs on the yield of these plants occurred in years of unfavourable weather conditions. The positive agricultural test results, especially under stress conditions, indicate that fertiliser produced with AgNPs as an ingredient may reduce the use of pesticides and highly concentrated mineral fertilisers. Such a fertiliser is fully in line with the idea of sustainable agriculture. However, research on the effects that AgNPs and fertiliser have on the environment and humans should continue.

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Recent Advancements in Carbon Nano-Infused Cementitious Composites

Cited by 9 publications

References 112 publications

Rheological Properties of Carbon Nanotube Infused Cementitious Composites with Various Amounts of CNT

Rheological Properties of Carbon Nanotube Infused Cementitious Composites with Various Amounts of CNT

Mechanical Properties and Microstructure of Calcium Sulfate Whisker-Reinforced Cement-Based Composites

Silver Nanoparticles (AgNPs) in Urea Solution in Laboratory Tests and Field Experiments with Crops and Vegetables

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