Influence of Magnetite Nanoparticles on Mechanical and Shielding Properties of Concrete

Abstract

This paper presents an experimental study on the performance of shielding concrete with additives of magnetite nanoparticles. Two concretes with magnetite additives as well as one based concrete were tested. In order to achieve the high-performance concrete, all concrete mixes had a constant water/cement ratio of 0.45. In order to measure the mechanical properties, concrete samples were made in accordance with dimension such as 40 × 40 × 160 mm. But, for measurement of protective properties the concrete was made in accordance with dimension of rotary antennas such as 400 × 400 mm with a thickness of 10 mm. The nanoparticles Fe 3 O 4 were synthesized by chemical condensation method. XRD have shown the presence of cubic structure of Fe 3 O 4 spinel with crystallite size is equal to 130.0 Å. The TEM microphotograph shows that the Fe 3 O 4 nanoparticles are spherical, the range of sizes is 12-30 nm. The magnetic retardation suggests that the magnetite nanoparticles have superparamagnetic properties. This is explained by the fact that under the influence of external magnetic field, they are single-domain, in other words, they become uniformly magnetized throughout the volume. The additives of magnetite nanoparticles at a concentration of 0.5% mass have not a negative effect on flexural strength. The samples with additives of magnetite nanoparticles showed better shielding of microwave radiation in the frequency range from 0.7 GHz to 13 GHz. The maximum efficiency of suppression of electromagnetic disturbance is equal to 19.9 dB at a frequency of 1.5 GHz with a thickness of 10 mm.

A comparative study on the mechanical, physical and morphological properties of cement-micro/nanoFe3O4 composite

“…Nano-hematite was also shown to have a better self-monitoring capability than nano-SiO 2 additive 16 . Furthermore, Fe 3 O 4 (magnetite) nanoparticles were fruitfully added into the concrete for shielding of microwave radiation 17 . The concrete containing 1.5 wt.% Fe 3 O 4 nanoparticles indicated the lowest water absorption and highest tensile strength compared to the concrete reinforced by the same amount of ZrO 2 , Al 2 O 3 and TiO 2 nanoparticles 18 .…”

Fe3O4 nanoparticles as additives for gamma-ray shielding: Structural and surface characterization

“…Electromagnetic pollution has been significantly increased during the 20 th century, due to the technological progress of the humanity. Prominent problem, which has not yet been solved, is that the electromagnetic interference disturbs functioning of devices, equipment, and systems used for commercial, industrial and military applications [4,5]. The type and the amount of shielding needed for electromagnetic radiation protection depends on the penetrability of the radiation [6].…”

“…The effectiveness of concrete as a gamma radiation shield is significantly improved by the addition of the magnetic nanoparticles additives [15][16][17], since concrete belongs to the group of dielectrics [18]. Reinforced with Fe 3 O 4 nanoparticles, concrete was found to be a suitable material for the suppression of gamma radiation [4]. Usage of Fe 3 O 4 nanoparticles as an additive for γ-ray shielding requires the preparation of the sizelimited Fe 3 O 4 nanoparticles.…”

“…Noteworthy, the above mentioned size depends on the energy of gamma radiation. For instance, literature data revealed that suitable size of the magnetite nanoparticles, used as additives for shielding of radiation with frequency 0.7 GHz, is~ 12 nm [4].…”

Rheological, Mechanical, Microstructural and Radiation Shielding Properties of Cement Pastes Containing Magnetite (Fe3O4) Nanoparticles

“…This is because it can be used to facilitate the formation of concrete with various properties, including self-sensing (Piro et al 2021) and self-healing (Seifan et al 2018;Shaheen et al 2019). Moreover, due to its highly magnetic properties, when added to cement-based composites, nano-Fe 3 O 4 can be used as an electromagnetic wave absorber (He et al 2018;Lesbayev et al 2017), or as a rheology controlling agent under a magnetic field (Jiao et al, 2020(Jiao et al, , 2021.…”