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Dr. sahar mohamed ibrahim abdelhameed :: Publications:

Title:
Fabricated CeO2/ZrO2 nanocomposite to improve thermal resistance, mechanical characteristics, microstructure and gamma radiation shielding of OPC composite cement pastes
Authors: Sahar M Ibrahim a , Mohamed Heikal a,* , Nesreen R. Abdelwahab b , O.A. Mohamed c,*
Year: 2023
Keywords: CeO2/ZrO2 nanocomposite Gamma rays shielding OPC composite pastes Thermal resistance Physico-mechanical properties
Journal: Construction and Building Materials
Volume: Not Available
Issue: Not Available
Pages: Not Available
Publisher: Not Available
Local/International: International
Paper Link:
Full paper Not Available
Supplementary materials Not Available
Abstract:

The main objective of this study is to utilize the synthesized CeO2/ZrO2 nanocomposite (CZ-NPs) in different concentrations (0.25, 0.5, 0.75, 1, and 1.5%) for improving the mechanical characteristics, microstructural properties, thermal resistance, and gamma radiation shielding of hardened ordinary Portland cement (OPC) composites. CZ-NPs were fabricated via the precipitation method. Various analytical techniques in addition to Xray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), and Scanning electron microscopy (SEM) analysis were used to investigate the fabricated CZ-NPs and hardened composite pastes. The physico-mechanical features, thermal stability, and radiation resistivity of different OPCCZ-NPs composite pastes were investigated. The results showed that the composite CZNP1 containing 0.25% CZNPs is the best choice for mechanical performance and has the highest gamma-ray shielding efficiency, as it can attenuate 50–90% respectively of gamma rays with energy 660Kev at distances 4 cm and 13 cm, respectively. Also, the composite accommodating of 0.5% CZ-NPs motivates the thermal resistance at 400 ◦C.

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