Properties of NdFeB magnetic cement

Chuewangkam, Nattapong; Pinitsoontorn, Supree; Chindaprasirt, Prinya

doi:10.1016/j.cemconcomp.2019.05.010

Cited by 14 publications

(4 citation statements)

References 45 publications

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“…It is noteworthy that the values of compressive strength here observed at 7 days resulted to be higher concerning those reported for high weight concretes bearing high content of magnetite (< 30 MPa) [ 7 , 14 ] and for NdFeB/cement composites [ 79 ].…”

Section: Resultscontrasting

confidence: 64%

Novel Magnetic Inorganic Composites: Synthesis and Characterization

et al. 2021

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The addition of magnetic particles to inorganic matrices can produce new composites exhibiting intriguing properties for practical applications. It has been previously reported that the addition of magnetite to concrete improves its mechanical properties and durability in terms of water and chloride ions absorption. Here we describe the preparation of novel magnetic geopolymers based on two different matrices (G1 without inert aggregates and G2 with inert quartz aggregates) containing commercial SrFe12O19 particles with two weight concentrations, 6% and 11%. The composites’ characterization, including chemical, structural, morphological, and mechanical determinations together with magnetic and electrical measurements, was carried out. The magnetic study revealed that, on average, the SrFe12O19 magnetic particles can be relatively well dispersed in the inorganic matrix. A substantial increase in the composite samples’ remanent magnetization was obtained by embedding in the geopolymer SrFe12O19 anisotropic particles at a high concentration under the action of an external magnetic field during the solidification process. The new composites exhibit good mechanical properties (as compressive strength), higher than those reported for high weight concretes bearing a similar content of magnetite. The impedance measurements indicate that the electrical resistance is mainly controlled by the matrix’s chemical composition and can be used to evaluate the geopolymerization degree.

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Section: Resultscontrasting

confidence: 64%

Novel Magnetic Inorganic Composites: Synthesis and Characterization

et al. 2021

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“…In doing so, the most commonly used conductive materials (e.g., nanomaterials [25]) of various forms are utilized in concrete mixtures to increase the conductivity of this composite material. For instance, Chuewangkam et al [26] utilized nano-size neodymium magnet (NdFeB) powder in the cement paste to produce a magnetic composite. They reported that the mechanical properties of the paste produced with magnetic powder were enhanced due to the increased density of the cement composite.…”

Section: Introductionmentioning

confidence: 99%

Physical-Mechanical and Electrical Resistivity Properties of Cementitious Mortars Containing Fe3O4-MWCNTs Nanocomposite

et al. 2023

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Recent growth in materials science and engineering technologies has pushed the construction industry to engage in new applications, such as the manufacturing of smart and electrically conductive products. Such novel uses of conductive construction materials would potentially allow their use in conjunction with various fields, such as those referred to as “Industry 4.0.” The following study uses iron oxide (Fe3O4)-multi-walled carbon nanotubes (MWCNTs) nanocomposites synthesized by chemical vapor deposition (CVD) and incorporated into the cementitious mortars as a substitute for sand at 1, 2, and 3% ratios to enhance the electrical conductivity. Results reveal that the electrical resistivity of cementitious composites decreases (due to the increase in electrical conductivity) from 208.3 to 61.6 Ω·m with both the Fe3O4-MWCNTs nanocomposites ratio and the increasing voltage. The lowest compressive strengths at 7 and 28 days are 12.6 and 17.4 MPa for specimens with 3% Fe3O4-MWCNTs and meet the standards that comply with most applications. On the other hand, the highest porosity was reached at 26.8% with a Fe3O4-MWCNTs rate of 3%. This increase in porosity caused a decrease in both the dry unit weight and ultrasonic pulse velocity (from 5156 to 4361 m/s). Further, it is found that the incorporation of Fe3O4-MWCNT nanocomposites can have a negative effect on the hardening process of mortars, leading to localized air cavities and an inhomogeneous development of cementing products. Nonetheless, the improvement of the electrical conductivity of the samples without significantly compromising their physico-mechanical properties will allow their use in various fields, such as deicing applications with low-voltage electric current.

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“…Meanwhile, there is no information about the influence of the magnetic field value on the fracture velocity of the ground material. In the majority of scientific works magnetic field is considered as a factor of influence on the stability of cement grout [26], in estimating of the cement hydration [27], either in the production of the magnetic cement [28] thus, there are no approaches to determination the impact of the magnetic field on the ground medium in the vortex mill.…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Magnetic Field on Dispersion of Crushed Portland Cement and Tensile Strength of Cement Stone

et al. 2023

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This paper investigates the effect of a magnetic field on the grinding processes of Portland cement and the axial tensile strength of cement stone. It was found that the dispersion composition of Portland cement is affected by the magnetic field in two modes. Moreover, the grinding of Portland cement without a magnetic field has subtle modes within small particles (0.1–0.4 microns). The grinding of Portland cement with a magnetic field demonstrates an increase in the mode area of small particles and a decrease in the area of large particles (more than 1.6 microns), with an increase in processing time. In this work, the previously established magnetoplastic effect was confirmed in cement stone only in crystalline samples. The determined effect on cement stone is to reduce its strength by 53-59% and simultaneously increase relative deformation by 63–149%, depending on the specimen size and type. The magnetoplastic effect is also visually recorded on scans of the crack edges in cement stone examined using probe microscopy. The obtained experimental data confirm the validity of the proposed hypothesis of the effect of the magnetic field on polycrystalline materials with isotropic structure, in particular portland cement and cement stone, which consists in the fact that the magnetic field contributes to the accumulation of dislocations in the material, an acceleration of their movement, and the development of cracks. Doi: 10.28991/CEJ-2023-09-05-015 Full Text: PDF

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Properties of NdFeB magnetic cement

Cited by 14 publications

References 45 publications

Novel Magnetic Inorganic Composites: Synthesis and Characterization

Novel Magnetic Inorganic Composites: Synthesis and Characterization

Physical-Mechanical and Electrical Resistivity Properties of Cementitious Mortars Containing Fe3O4-MWCNTs Nanocomposite

Study of the Effect of Magnetic Field on Dispersion of Crushed Portland Cement and Tensile Strength of Cement Stone

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