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Rheological, Mechanical, Microstructural and Radiation Shielding Properties of Cement Pastes Containing Magnetite (Fe3O4) Nanoparticles.
- Source :
- International Journal of Concrete Structures & Materials; 1/28/2023, Vol. 17 Issue 1, p1-14, 14p
- Publication Year :
- 2023
-
Abstract
- This work examines the influence of iron oxide nanoparticles (Fe<subscript>3</subscript>O<subscript>4</subscript> NPs) on neutron and gamma-ray radiation shielding characteristics of Portland cement paste. Experimental evaluations were supplemented with theoretical studies using NXCom program. Portland cement pastes with 5, 10, 15, 20, and 30 wt% of nanomagnetite cement replacement were produced. Moreover, rheological, early strength development, compressive strength, and mercury intrusion porosimetry (MIP) tests were performed. The results showed that increasing the amount of Fe<subscript>3</subscript>O<subscript>4</subscript> NPs in a mix leads to a gradual increment in measured viscosity and yield stress. High nano-Fe<subscript>3</subscript>O<subscript>4</subscript> content substantially impeded the early strength development process and led to a decrement in the 7- and 28-day compressive strength of cement paste. The MIP studies exhibited a gradual increment in total porosity, and average pore volume, as nano-Fe<subscript>3</subscript>O<subscript>4</subscript> content was increased. All the macroscopic cross-sections of slow, fast and thermal neutrons constantly increased as a result of the addition of magnetite nanoparticles, with their variations being markedly linear. Similarly, gamma attenuation test results indicated that the addition of Fe<subscript>3</subscript>O<subscript>4</subscript> powder enhances the shielding capability of paste in the energy range of interest (0.08–2.614 MeV). In conclusion, Fe<subscript>3</subscript>O<subscript>4</subscript> nanoparticles can be successfully used in producing lead-free cementitious composites with improved gamma-ray and neutron shielding properties. However, certain drawbacks related to an increment in matrix porosity and thus a decrement in mechanical performance should be taken into account. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19760485
- Volume :
- 17
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- International Journal of Concrete Structures & Materials
- Publication Type :
- Academic Journal
- Accession number :
- 161551030
- Full Text :
- https://doi.org/10.1186/s40069-022-00568-y